2 product specification

1 DR. STRAUSS MESSTECHNIK GMBH D-96173 Oberhaid / D-95148 Baunach

Phone +49 9503-504 3568 / Fax -504 6150 (Office) Phone +49 9544-987 1204 / Fax -987 1726 (Works)

INFO www.strauss-mess.de email [email protected]

TRAS F2-E

DR. STRAUSS

Impulse Measurement Calibration - Diagnosis www.strauss-mess.de

Measurement Calibration Diagnosis

Product Specification

Impulse Voltage Test Technique




TRAS F2-E

DR. STRAUSS


Performance Progress of Digital Recorder in the last 16 years

TR-AS 200-12 Kalibrierung bei der PTB / Calibration at

Already in 1987, the first TR-AS 100-8 Digital Recorder was delivered to customers for h.v. impulse tests and was therefore the first system with 100 MS/s sampling rate, which fulfilled all requirements of the IEC 1083-1, published later in 1991. A short time later in 1989 followed the TR-AS 100-10 Digital Recorder as the leading systems with 100 MS/s sampling rate at 10 Bit resolution which fulfilled all requirements of IEC 1083-1 in all respects for comparative measurements, too. The first competitor system with a sampling rate of 100 MS/s as required in IEC 1083-1 followed with 120 MS/s and 12 Bit resolution years later in 1997, when we finished the design of the TR-AS 200-12 Digital Recorder with 200 MS/s sampling rate and 12 Bit resolution. End of 2002 we presented a new designed system with 200 MS/s and 14 Bit resolution and further significantly reduced noice.

200 MS/s reduces measuring uncertainty 12 to 14 Bit show details of measured waves The higher sampling rate of 200 MS/s (5ns sampling intervall instead of 8 or 10 ns) show increased accuracy and reduced standard deviations for the front time of full impulses as also for the peak and the time-to-chopping at front chopped impulses during calibration. The influence of the increased resolution from 10 Bit (0.1%) to 12 or 14 Bit (0.006 %) to the resulting overall measuring uncertainty of approx. 0.5% to 0.7% is hereby negligible.

TR-AS 200-14: The static integral non-linearity INL referred to 14 Bit resolution shows at 200 MS/s an excellent lapse and stays signifikant inside the required limits of 0,5% in IEC 1083-1. The INL influences directly the measuring accuracy as also the calibration results.

TR-AS 200-14: Differential Nonlinearity DNL under dynamic conditions referred to 12 Bit resolution. The result with < 0,2 LSB shown in Figure 5 is significantly below the limits required in IEC 61083-1 of 0,8 LSB.

+0,5% Limit IEC 1083

-0,5% Limit IEC 1083

Performance progress of Digital Recorder in the last 16 years

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MS/s, MHz

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22Bit

SampleRate MS/s

Bandwidth MHz

Resolution Bit

TR-AS 200-12

voller Blitzsto/ full wave LI 0,84/60

200 MS/s

abgeschnittener Blitzsto/ chopped

wave Tc=0,5ms 200 MS/s

Mebereich/ Range

d dT1 dT2 d dTc d dTc V V % % % V % % V % %

2000 -966,8 -0,3 0,5 -0,2 -740,4 0,1 0,6 -742,0 0,0 -0,2 1600 -966,2 -0,3 0,4 -0,6 -740,5 0,1 0,4 1250 -1000 0,0 1,7 -0,7 -741,8 0,2 0,4 1000 -801,7 0,1 0,7 -0,6 -742,2 0,3 0,4 -742,0 0,3 -0,2 800 -641,6 0,1 0,8 -0,8 -635,7 0,1 0,2 640 -513,0 0,0 0,7 -0,7 -508,5 0,0 0,4 -508,0 0,1 -0,2 500 -400,8 0,0 0,8 -0,7 -397,7 -0,3 0,4 400 -321,0 0,2 0,7 -0,7 -318,1 -0,3 0,4 320 -256,7 0,2 0,8 -0,8 -254,8 0,0 0,4 -255,4 -0,1 0,2 256 -205,2 0,1 0,6 -0,7 -203,4 -0,2 0,8 200 -160,4 0,1 0,4 -0,6 -158,3 -0,4 0,8 160 -128,3 0,1 0,2 -0,6 -127,0 -0,3 0,6 128 -102,7 0,2 0,4 -0,7 -102,3 -0,1 0,8 102 -82,2 0,2 0,7 -0,8 -82,4 0,0 0,8 -82,4 0,2 0,0 80 -64,0 0,2 0,8 -0,9 -64,8 0,0 0,6 80 64,1 0,1 0,5 -0,4 65,1 -0,2 0,8

102 82,2 0,2 0,6 -0,3 82,8 -0,1 1,2 82,8 0,1 0,0 128 102,8 0,2 0,5 -0,4 102,7 -0,2 0,6 160 128,4 0,0 0,6 -0,3 127,6 -0,4 0,4 200 160,6 0,1 0,8 -0,3 159,1 -0,4 0,8 256 205,5 0,1 0,7 -0,5 204,3 -0,4 0,8 320 256,9 0,1 0,8 -0,5 255,7 -0,3 1,0 256,8 -0,2 0,2 400 321,3 0,1 1,0 -0,3 319,2 -0,3 0,6 500 401,2 -0,1 1,1 -0,3 399,5 -0,3 0,8 640 513,7 0,0 1,0 -0,4 511,3 -0,2 0,8 512,0 0,0 0,0 800 642,1 -0,1 0,4 -0,3 638,7 -0,1 0,8 1000 803,1 0,0 0,7 -0,2 747,1 0,2 0,8 748,0 0,1 -0,2 1250 1000,3 -0,2 1,1 -0,4 747,4 0,3 1,0 1600 968,6 -0,2 0,4 -0,6 745,9 0,1 0,8 2000 969,7 -0,1 0,4 -0,4 747,3 0,3 1,0 748,0 0,1 0,0

abgeschnittener Blitzsto chopped wave Tc=0,5ms

1 GS/s Oversampling




TRAS F2-E

DR. STRAUSS


The well-established Impulse Voltage Measuring Systems TR-AS, including the digital recorders from our own development and manufacturing, were further developed consequently and now feature improved sampling rates up to 200 MS/s in real-time with 14 Bit

resolution simultaneously in up to 16 measuring channels. The new developed composit A/D-converter hardware system generates raw data with up to 14 Bit resolution together with the highest available

sampling rate of 200 MS/s today and optionally 400 MS/s with 10 to 12 Bit resolution is available for steep i.v. tests. The high sampling rate of 200 MS/s and the high bandwidth of 50 MHz show increased accuracy and reduced

Digital Impulse Voltage Measuring Systems TR-AS 60-10/12 / 100-10/12 / 200-12/14 (400-12)

Highest performance with up to 200 MS/s sampling rate and 12 to 14 Bit resolution simultaneously in all channels

Measuring Rack MIRA 25 Compact design with all components including printer inside the rack easy to move inside the test field all sensitive connections inside the rack (keyboard, display, printer) are well shielded 17 or 19 large TFT-Display Keyboard with touchpad in drawer Wireless keyboard and mouse optional Laser Printer in drawer Measuring rack mount with 1 to 4 channels each with: Direct input 100 mV to 10 V on front Input 12 V to 2000 V on front Measuring line bushings to the rear Suitable for i.v. tests and calibrations in the test field with high electromagnetic distortions Dimensions: approx. 55x65x125 cm (WxDxH) Weight: approx. 80 kg

Desktop-Housing DERA 6 Compact design for i.v. tests and calibrations in the test field and on site with connection to printer and fileserver via glassfibre LAN 12 TFT Color Display Keyboard with touchpad in drawer Measuring rack mount with 1 to 4 channels each with Direct input 100 mV to 10 V on rear Input 12 V to 2000 V on rear Dimensions: approx. 55x55x35 cm (WxDxH)Weight: approx. 25 kg

80% input range steps allow finest adaptation to measuring voltage:

impulse measuring input 2000-1600-1250-1000-800-640-500-400-320-250-200-160-125-100-80-64-50-40-32-20-16-12 V

direct input 10-8-6.4-5-4-3.2-2.5-2-1.6-1.25-1-0.8-0.64-0.5-0.4-0.32-0.25-0.2-0.16-0.12-0.1 V

double overload of inputs guaranted without saturation effect e.g. at unexpected high impulse current amplitudes

Long-term stable scale factors of all amplifier stages guaranting stable calibration results for many years

Input adapter for LEMO, C, UHF matching all kinds of Impulse Voltage Generators from known manufacturers

Uncertainty of 1% (0.7%) for peak and 2% for time parameter

Noise level of 0.01% and linearity of 0,1 LSB are out-standing values

Complete Type Test according to IEC 61083 for all TR-AS digital recorder available since 1993

Works Calibration Certificate or DKD Calibration Certificate with traceability to National Standards at PTB Braunschweig

standard deviations for the front time of full impulses as also for the peak and the time-to-chopping at front chopped impulses. A careful design using sophisticated programmable logic controllers and SMT optimizes the demanding requirements like high sampling rate, small risetime, minimized noise, short settling time, small measuring uncertainty and good long-term accuracy. This results in nearly smooth w a v e s h a p e s w i t h o u t v i s i b l e quantization steps and significantly improves the accuracy of diagnosis using difference method or transfer function. The direct input of the high bandwidth precision amplifiers with an input impedance of 1 MOhm allows the measurement of the step response of i.v. dividers matching to impedance of the 2000 V measuring input. The patented multi-timebase allows setting of up to 8 individual sampling rates each with a selectable number of samples, so individual time profiles can be generated, e.g. a profile similar to an exponential timebase. As an option, for multichannel applications in the high power test field, the sampling rate of each individual channel can be indepently selected. With this option fast transients and slow events can be recorded with

Common Features of TR-AS: TR-AS and WinTR-AS are registered trademarks of DR. STRAUSS




TRAS F2-E

DR. STRAUSS


Digital Impulse Voltage Measuring Systems TR-AS 60-10-12 / 100-10-12 / 200-12-14 / 400-12

Remote Control Digital Recorder TR-AS RC The TR-AS RC digital recorders are designed for recording task only. The WinTR-AS software installed on an external control computer overtakes all control functions of the test procedure via the LAN with: Setting and arming the TR-AS RC, transfer of the raw data after recording, evaluation and display of shapes, saving the records in the database, generating the test record and printing to any network printer.

This new designed measuring technique of network controlled digital recorders gives the possibility for applications were measuring channels are distributed in large test fields, in control rooms on-site or anywhere around the world via Internet. The following example show how to reduce earthing problems in a very large transformer testfield

TR-AS RC with 1 to 4 measuring channels located closed to the test field

Control Computer - Laptop PC inside the control room

TR-AS RC Remote Control Housing for connection via LAN (green) to the host computer (PC or Laptop) Measuring rack mount with 1 to 4 channels with brackets for building into any 19 measuring rack or for using on the desk Direct input 100 mV to 10 V Measuring Input 12 V to 2000 V suitable for i.v. tests and calibrations in the test field and on-site Dimensions: appr. 50x55x20 cm (WxDxH) Weight: approx. 16 kg

The left picture shows the typical arrangement of the voltage and current measuring circuit with a measuring system TR-AS or TR-AS RC for voltage and current with the known Earthing Problem: I.V. Generator, chopping gap and i.v. divider have with respect to the Test Object a different ground potential. During the impulse test ground currents are flowing over the coaxial shield of the measuring lines which cause distortions in voltage and current lapse. The right picture show the suggested arrangement with the solved earthing problems using two separate remote controlled TR-AS RC digital recorder for voltage and current measurement. Both digital recorders are controlled from the control computer with installed WinTR-AS software which joins the records of voltage and current to one common record.

Working Desk with Measuring Rack MIRA 12 for installation of 19 measuring rack mount, for reducing of electromagnetic interferences into the neccesary connection cables and disturbances caused hereby, with complete as-sembly of the offered components, with additional mains filter, approx. dimensions: Table 160 x 80 x 75 cm, MIRA 55 x 60 x 70 cm (WxDxH) Industrial PC Control Computer 19 TFT display, Color Laserprinter, Keyboard and Mouse, connected to the TR-AS digital recorder via fibre-optic LAN TR-AS RC Remote Control Housing Measuring rack mount with 1 to 4 channels with brackets for building into any 19 measuring rack or for using on the desk Direct input 100 mV to 10 V Measuring Input 12 V to 2000 V for connection via LAN to the host computer (PC or Laptop)

Input Connection Unit For easy connection of measuring cables without or with Terminating Resisstor for current measurements




TRAS F2-E

DR. STRAUSS


Technical Data of Digital Recorder TR-AS 60-8-10-12 / 100-8-10-12 / 200-12-14 / 400-12

1) 100 MS/s systems available also with 60 and 25 MS/s max. sampling rate 2) referenced to 12 Bit (according to IEC 1083-1) 3) 400 MS/s with terminated input only

Input Stage values in brackets on request (reference systems)

No. Measuring Channels 1 .. 4 Measuring input, single ended N-type / LEMO optional Measuring range for impulse 12 - 2000 V Bandwidth analogue (-3dB) DC - 50 MHz (70 MHz) Risetime 7 ns (5 ns) Input test voltage 0.1/2000 us 3.5 kV Input impedance 1 MOhm / 30 pF Direct measuring input 65 mV - 10 V, BNC Bandwidth analogue (-3dB) DC - 70 MHz Risetime 5 ns Input impedance 1 MOhm / 30 pF Input Settings Factor 1.2 automatically controled 23 Stages Internal Noise Level < 0.1% Interferences < 0.1%

Record Interval

at sampling rate 200 MS/s 1.25 / 2,5 / 5 ms at sampling rate 100 MS/s 2.5 / 5 / 10 ms at sampling rate 5 MS/s 52 / 104 / 209 ms

Trigger

channels single, OR-connected yes internal level pos. and neg. level internal dynamic (deviation) pos. and neg. dU/dt external 5 - 200 V, BNC

Selftest and Calibration check memory, scale factor and risetime

Limits on overall errors according to all applicable Standards (IEC 1083, IEC 60, IEEE 1122, IEEE 4, ... )

Impulse scale factor

constancy in time interval 0.25-1.0 s and 0.42 s upto >20 ms 1% uncertainty < 0.5%

lightning and switching i.v., full and standard chopped, impulse current peak value 1% (0.7% optional) time parameter 2%

front chopped voltage 1.2/50 s

peak value, Tc=0.5s 1.5% (1% optional) time-to-chopping, Tc=0.5s 3% (2% optional)

Evaluation WinTRAS - Software shape, accuracy: according to IEC-61083-2 automatic meancurve calculation ON/OFF selectable manual evaluation ON/OFF selectable

Calibration Interval every 2 to 4 years recommended

Control and Evaluating System Personal Computer state of the art, e.g. 2 GHz CPU, 1GB RAM, Harddisk 80 GByte, Diskdrive 3,5", CD/DVD-RW, Color-Laserprinter, Streamer, Glassfibre-Netconnection,... Power: Voltage 230 V +10%/-20%, (optional 100/115 V), Frequency 50-60 Hz, Power 400 VA Environmental: Ambient Temp +5...+40C, Humidity 0...90%, non condensating Technical data and design subject to change without notice. Alternative design on request.

Application Approved and reference measuring systems in high-voltage and high-power tests precise steep impulse measurement simultan multichannel systems dynamic tests fourier-analyses quality control ..

DKD-Calibration The measuring systems can be calibrated in our DKD Calibration Laboratory accreditated by the PTB. The Calibration Laboratory issues DKD-Calibration Certificates which documents the traceability to National Standards.

Type Test Report TR-AS 100-10 Since 01.08.1993 a complete type test report according to IEC 1083-1 is available for the digital impulse voltage measuring system TR-AS 100-10 which is designed as an approved, reference or reference standard measuring system.

Type Test Report TR-AS 200-14 The new family with TR-AS 100-12 to TR-AS 200-14 consequently continue developed show improved performance. The excellent overall performance makes them the most sophisticated system today available for comparative measurements during transformer tests.

A complete family of digital recorders!

Digital Recorder 100 -8 1) 100 -10 1) 100/200 -12 400 -12 3) 200 -14 Rated resolution of output data (Bit / %) 8 / 0.4 10 / 0.1 12 / 0.025 12 / 0.025 14 / 0.006 Static integral non-linearity (%) 0.5 0.25 0.2 0.2 0.1 Static differential non-linearity 0.8 0.6 0.3 0.3 0.3 Dynamic differential non-linearity 0.8 0.8 0.8 0.8 0.8 2) Sampling rate selectable 2.5 kHz-400 MS/s 2.5 kHz-200 MS/s Sampling interval uncertainty 0.1 ns Non-linearity of Quarz Time Base 0.01% Record Length (standard/optional) 262144 / 512K / 1M No. of Timebase 2 to 8 selectable Timebase Recording Mode A-B-C-...H-Sequence

2.5 kHz - 25 / 60 / 100 / 200 MS/s 1)




TRAS F2-E

DR. STRAUSS


Desktop-Housing DERA 6 Measuring rack mount with 10.4 or 12 TFT -Colordisplay PC 1,2 GHz, 256 MB RAM, WindowsXP, 30 GB harddisc, CD-RW etc. Keyboard with trackball in drawer suitable shielding for high EMC

Dimensions: approx. 55x55x40 cm (BxDxH) Weight: approx. 25 kg Environmental: Ambient Temp +5...+40C, Humidity 10...90%, non condensating

Rear view: TR-AS 10-12/8-32 8 analogue channels with BNC-input optional: Isolating amplifier with 2 or 7kV isolation a.c. 32 digital channels with 2 kV optical isolation, multicontact connectors Connection for Calibrator control, Printer, COM, Network, external SVGA-monitor Mains filter, efficient Fan Technical data and design subject to change without notice. Alternative design on request.

10 / 25 / 40 / 60 / 100 MS/s sampling rate and 12 Bit Resolution

Applications: Complexe and precise impulse measuring with simultan multi-channel system High-power testfield Switchgear test Monitoring recorder Protection relay test Quality control Measurements in developement and testfield, ...


Digital Recorder TR-AS 10/25/40-12 Analog-Digital-Converter Resolution 12 Bit / 0.025 % Linearity 1/2 (2) LSB Filter-Frequency 5 MHz / 500 / 50 kHz Sampling Rate (simultan, realtime) 0.5 kS/s - 10 MS/s Sampling Rate (simultan, realtime) 25 / 40 MS/s optional No. of Timebase 2 to 8 selectable Timebase Recording Mode A-B-C-...H-Sequence Record Length (standard/optional) 64K / 256K / 1M Data

Analogue Input 1 - 8 Measuring range via attenuator 160:1 10 - 1600 V

Bandwidth d.c. - 5 MHz Input impedance 1 MOhm / 30 pF Direct input 100 mV - 10 V, BNC Input setting factor 0.8-sequence 0.1-0.125-...-6.4-8-10V automatically controlled 23 Stages Digital Input 4 - 32 Input range LOW / HIGH 0 V / 5 to 250 V

Trigger pre-/posttrigger channels single, OR-connected yes internal level pos. and neg. level internal dynamic (deviation) pos. and neg. dU/dt external 5 - 250 V, BNC

Multichannel Transient Recorder Measuring Systems

TR-AS 10-12 / 100-10 / 100-12 / 200-12




TRAS F2-E

DR. STRAUSS


Impulse Measurement Components Tubular Shunts - Isolation Amplifier

Multichannel-System based on TR-AS 10-12 with 3 analogue and 24 digital inputs for measurement of make and break times. The picture shows revision checks of elder 110 kV compressed air switchgear. The measuring system is placed inside a transportation car and connected to the interrupter under test which must be switched free from h.v. during the measurement. The triggering of the system follows automatically with help of the releasing coil current, measuring data will be evaluated by hand or automatically and then stored on to harddisk to generate a test record.

On-Site Switchgear Test System

ISO-VER 2.2 2 or 4 kv a.c.isolation 1 to 8 channels input 1 to 1000 V 1 MOhm / 30 pF output 1 V bandwidth 100 kHz accuracy 1%

Isolation Amplifier Systems ISO-VER 12 / 2.2 for applications in the high power test field together with TR-AS multichannel transient recorders

A floating current input from mA to kA can be realized using a suitable measuring shunt at the input.

The Impulse Current Measuring Shunts ICMS are new designed tubular shunt types with best performance response behaviour. They show no overshoot or oscillations and need no compensation box to optimize the transient behaviour as known from e.g. cage shunts. Tubular shunts type ICMS are therefore ideal for current measurements during transformer tests. The resis-tance material of the inner tube show high energy absorption capability and very low temperature coefficient and therefore negligible non-linearity effect for impulses of different magnitude. This is very important for

comparison of shapes e.g. of 50% and 100% test level during transformer tests. The Impulse Current Measuring Shunts ICMS are designed for measurements of impulse currents with shape 8/20 s according to IEC 60060-1. For impulse currents with any shape the maximal action integral or the maximal voltage drop must not be exceeded.

Tubular Impulse Current Measuring Shunt ICMS

Typ Type ICMS 20 ICMS 10 ICMS 2.5 ICMS 1 Nenn-Impulsstrom 8/20 rated Impulse current 8/20 A 20 000 10 000 2 500 1 000 Widerstandswert 10% Resistance 10% 0.025 0.05 0.2 0.5

Empfindlichkeit Sensitivity V / 25 50 200 500

Arbeitsbereich mit TR-AS digital recorder

Working Area with TR-AS digital recorder A 200 100 25 10

Anstiegszeit Tr Rise time Tr ns




TRAS F2-E

DR. STRAUSS


VFT Measuring System for GIS Remote Control Digital Recorder TR-AS RC

VFT-Measuring System TR-AS RC for VFT Digital Recorder with 200 MS/s sampling rate and 12 Bit resolution, remote controled by external Laptop Computer The VFT-Measuring System TR-AS RC for VFT is special designed for high bandwidth and allows measurements of very fast transients (VFT) in a frequency range from power frequency up to 100 MHz directly with help of capacitive sensors, e.g. PD-sensors installed in Gas - Insulated Switchgear (GIS). Additionally measurement of lightning and switching impulse voltages as also A.C. measurements on the finally installed GIS can be performed. Principle of measuring system The measuring system consists of an electrical field sensor with capacitance C1, a directly coupled low voltage capacitor and a coaxial measuring line with capacitance C2 which forms together a capacitive voltage divider with a ratio of approximately C2:C1.

The measuring line is connected to the 250 V input of the digital recorder which includes an input divider with ratio 25:1. The 10 V output of the divider is connected with a BNC-bridge to the 10 V input of the programmable measuring amplifier channel 1 of the digital recorder. Software Control The VFT-Measuring System is remote controlled via the local area network (LAN) by an external Laptop Computer with special remote control software. The VFT-Measuring System includes an Industry computer with harddisc and LAN-interface but without display and keyboard. The WinTRAS-Software for control and measurement is installed on the harddisc of the VFT-Measuring System and can be transparently operated with help of the remote control software on the Laptop Computer.

Basic Connections Gas - Insulated Switchgear GIS Flange with PD-sensor inbuilt with N-Connector Low-voltage capacitor Measuring cable to TR-AS RC Short-Circuit-Connector on chain

Components of the (pure) VFT-Measuring System TR-AS RC: Low Voltage Capacitor (blue) with N-Connectors Coaxial Connection cable with N-connectors (grey) Digital Recorder TR-AS RC with power cord (left side) Glassfiber-Connection Cable (orange)

Connection Box with power cord (in the middle) LAN-connection cable to PC (0.5 m length) Laptop Computer (PC) with power supply (black) and special short power cord (0.3 m length)

Principle design for single channel version

Principle design for single channel version (design changes to TR-AS RC style in case of higher channel count or Combined VFT / Impulse System)




TRAS F2-E

DR. STRAUSS


Technical Data

Low-Voltage Capacitor N-Connectors

rated Voltage 250 V (option for additional 2000V input => Combined VFT/Impulse System) Measuring Cable Triaxial 75 Ohm with N-Connectors, 10 m length (other length optional)

Rated Capacitance C2 13 000 pF 15% (other C2 available on request) Digital Recorder TR-AS 200 - 12 Rated resolution of output data (Bit / %) 12 / 0.025 Sampling rate selectable 2.5 kHz-200 MS/s Sampling interval uncertainty 0.2 ns Non-linearity of Quarz Time Base 0.01% Record Length 256K Data (1024K Data optional) Input Stage

No. Measuring Channels 1 - 4 (max.2 channels if Combined VFT/Impulse System) Measuring input, single ended 250 V input divider 25:1, N-connector (option additional 2000V input divider 200:1) Measuring range 5 V - 250 V (option additional 40 - 2000 V for Combined VFT/Impulse System) Input impedance 20 MOhm / 5 pF (option 1MOhm / 33 pF for additional 2000 V input) Input test voltage 0.1/2000 us 350 V Measuring input, single ended 10 V input, BNC-connector Input impedance 1 MOhm / 33 pF Measuring frequency range for VFT 10 Hz - 100 MHz Input Setting Sequence Factor 1.2 automatically controlled 16 Stages Impulse scale factor

constancy 0,1 s to >> 1 s 1% long term stability (one year) 0.5% Limits on overall errors according to all applicable Standards (IEC 61083, IEC 60060, IEEE 1122,

IEEE 4, ... ) Calibration Interval every 2 to 4 years recommended Control Computer Industrial type, CPU 1.6 GHz RAM >= 1 GByte Harddisk 160 GByte Netconnection 100 M glassfibre SC Desktop-Housing TR-AS RC 64-4HE Dimensions: (BxDxH) approx. 50x55x20 cm) Weight: approx. 16 kg

Connection box (on available for single channel device) For connection of TR-AS RC and external Laptop PC with following components

Media Converter TP glassfibre SC, 100M, with power supply Power connections To mains and Laptop PC

Power Requirements

Voltage 115 230 V Frequency 50-60 Hz Power 200 VA

Environmental:

Ambient Temp +5...+40C Humidity 10...90%, non condensating

Laptop PC External

Specification According to separate Operation Manuals

Technical data and design subject to change without notice. Alternative design on request.

VFT Measuring System for GIS




TRAS F2-E

DR. STRAUSS


TR-AS FRA High Resolution Frequency Response Analysis (FRA) System

for Power Transformer Diagnosis and Network Analysis

Remote controlled High Resolution

TR-AS Transient Recorder

Impulse Voltage Generator for

STEP Excitation

Connection Unit for Voltage, Current and transferred Voltage

Easy 2-pole connection for

reproducible On-Site-Tests

The Frequency Response Analysis (FRA) on power transformers is used for diagnosis at works, after putting into operation and for maintenance on site. The frequency-dependent admittance is determined and recorded as fingerprint. The FRA taken before and after a transport should show no differences, otherwise a movement e.g. of a winding must be assumed. Because small movements results in very small deviations in the FRA lapse, the measurement method must be very stable and sensitive. The application of the step response method gives a complete measuring result after applying the STEP voltage and calculating the frequency-dependent admittance with help of the frequency spectra of voltage and current lapse determined by the fast Fourier transform (FFT). A minimum of 12 Bit resolution and 64K data for FFT is required, with 256K or 1M data finest frequency resolution is resulting.

Testing Method The Frequency Response Test System was designed for direct measurement of the frequency behaviour of transformer windings with the step voltage method. The test object is connected as a 2-pole to the step voltage impulse generator RIG with 350 V peak voltage and sufficient energy without additional measuring lines and shunts. Voltage and current are picked directly at the step voltage generators output and therefore not subject of variation of external connections. This is an important advantage especially for on-site tests after shipping or for maintenance, because of the easy connection

reproducible measurements can be expected. The output voltage and the respective current are recorded with help of a special designed transient recorder TR-AS with a basic resolution of 12 Bit at 10 or 40 MS/s maximum sampling rate, an adapted bandwidth of 5 MHz and minimized noise of 0.013% (type test). The basic resolution of 12 Bit is improoved by a repetitive averaging technique accumulating a number of voltage and current records phase-equivalent in the time domain. Depending on the number of accumulations, resulting resolutions up to 32 Bit are reached with a significant reduced noise. For e.g. 16 accumulations 16 Bit resolution and for 1024 accumulations 26 Bit resolution are resulting.

single shot with 12 Bit

16 accumulations with 16 Bit resulting resolution

For measurement of Short-Circuit Admittance Function Open-Circuit Voltage Transfer Function D.C. and 50/60 Hz impedance

Perfect EMI-reduction Because the instant of the step voltage excitation is not correlated to external electromagnetic fields, e.g. caused by power transformers, switchgear or radio stations, their influence is reduced corresponding to the number of accumulations applied. The optimal No. of accumulations as the best compromise between test time and Selecting 16 accumulations is a good compromise, testing time for each winding is few Minutes, distortions are reduced 16 times and resolution is increased to 16 Bit corresponding to 0,0015% accuracy of digital data used for FFT calculations. This aspect allows to get best results also during on-site FRA-measurements

FRA on the windings u, v, w against N

current lapse in the time domaine 400x zoomed up to 0,025% per div. vertically

10Hz 100Hz 1.0KHz 10KHz 100KHz

1.1E-5

1.1E-4

1.1E-3

1.1E-2

1.1E-1

1.1E+0

1.1E+1

1.1E+2

1.1E+3

10Hz 100Hz 1.0KHz 10KHz 100KHz

0.40*pi

0.80*pi

-0.40*pi

-0.80*pi

HV-w, all-GND HV-w, all-GND HV-w, all-GND




TRAS F2-E

DR. STRAUSS


TR-AS FRA High Resolution Frequency Response Analysis (FRA) System

for Power Transformer Diagnosis and Network Analysis



For more information please refere to our Product Specification and to our website www.strauss-mess.de/products/

Remarks: The Measuring System is not designed and applicable for high-voltage tests.

Technical Data

Remote Control Computer LAPTOP PC CPU Pentium, min. 1 GHz RAM 256 MByte Harddisk 40 GByte Diskdrive 3,5" CD-RW yes TFT-Color-Display 14" (15) Netconnection LAN or WLAN

Input Stage

No. Measuring Channels 2 Measuring input, single ended BNC / N Measuring range for impulse 60mV - 10 V / 10 V - 1600 V Bandwidth analogue (-3dB) DC - 5 MHz automatically controlled 22 Stages Internal Noise Level < 0.02% Impulse scale factor

constancy 0,5 s to >> 1 s 1% long term stability (one year) 0.5% Calibration Interval every 2 to 4 years

recommended

Digital Recorder TR-AS 12 RC Rated resolution of output data 12 Bit / 0.025 % accumulation range 14 ... 24 Bit Record Length each channel 1M Words (1,048,576)

Unit-Step-Voltage-Generator Charge voltage inbuilt h.v. supply 350 V Charge capacitor charge-capacity 5.3 F Switching-device Electronically

Risetime (no load) < 10 ns (10/90%) releasing automatically controlled , manual impulse output 350 V, positiv output peak power 250 W peak

Power Requirements Voltage 230 (115) V +10%/-20% Frequency 50-60 Hz Power 200 VA

Ambient Temp +5...+40C Humidity ...95%, non condensating

Environmental:

Desktop-Housing 19 Dimensions: (BxDxH) approx. 45x45x18 cm Weight: approx. 12 kg

FRA-Analysis System TR-AS FRA frequency range D.C. to 1 MHz / 10 MHz frequency resolution 2,4 Hz or 24 Hz selectable FFT filter bandwidth 1 Hz or 10 Hz

discrete frequency points 512 K (524,288) display range 9 decades / 180 dB dynamic range 150 dB

admittance range 1 S ... 33 S impedance range 30 mOhm .. 1 MOhm

dynamic vertical accuracy 1 dB vertical resolution 0.00025 ( -72 dB)

with 16 accumulations to 16 Bit 0.000016 ( -95 dB) vertical display admittance, impedance

lin, log, dB horizontal display lin, log

frequency accuracy 0.01%

FRA results in double-log display: horizontal range 10 Hz .. 10 MHz vertical display range 0,1 S .. 100 S or 10 M .. 10 m in 9 decades corresponding to 180 dB

Following tests show the performance of the FRA-System: short circuit test: at d.c., resulting value of 33 S / 30 mOhm no load test: resulting value of 1 MOhm || 30 pF corresponding to the impedance of the 160:1 input divider for voltage measurement calibration test: inbuilt calibration resistance 1 mS / 1 kOhm test on a 1175 MVA Short Circuit Transformer, secondary

winding 3.1 - GND, all other terminals on GND the blue limits show the possible working area of the FRA-

System from d.c. up to 10 MHz and 30 m (33 S) up to 1 M ( 1 S) corresponding to 150 dB vertical dynamic range

The shapes of the no load test and the short circuit test performed at the open respectively short-circuit output terminal of the FRA-System show approximately the limits for determining admittances respectively impedances of networks, e. g. power transformers, in the

calibration test: 1 mS / 1 kOhm

1175 MVA Short Circuit Transformer winding 3.1-GND

no load test: 1 MOhm || 30 pF

short circuit test: 33 S / 30 mOhm




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Arrester Test System TR-AS 60/100-10 with 4 channels

Rectangular evaluation Td The time duration where the amplitude of the Impulse is greater than 90% of its peak value. Tt The time duration where the amplitude of the Impulse is greater than 10% of its peak value. Tz Time from T0 (virtual time zero) to the first crossing with zero line Ip, Up Peak value of current, voltage Tmin begin of the integral interval Tmax end of the integral interval If search automatic integration interval (tmin to tmax) is selected the software searched the tmax instant. The software tries to find following time instants: Tz time-to-zero, first crossing with 0% level T10 crossing with 10% level, Tt T30 crossing with 30% level, Tie30 T50 crossing with 50% level, T2 T70 crossing with 70% level, Tie70

Measuring and Evaluating System TR-AS 60-10 Type DERA 6 The system with 4 simultane channels is designed with digital recorder components TR-AS 60-10 or optional TR-AS 100-10/12 as follows: Ch 1 impulse current recorded with 60 MS/s up to 1000 ms Ch 2 residual voltage recorded with 60 MS/s up to 1000 ms Ch 3 arrester voltage recorded with 2.5 kS/s up to 20 sec. Ch 4 arrester current recorded with 2.5 kS/s up to 20 sec. The timebase of the channels can be set individually while the trigger event is simultan for all channels. For permanent watching of a.c. voltage and current during duty tests an additional oscilloscope is inbuilt showing the actual values rms and peak/2 of Ch 3 and Ch 4 independent of their recording status.

The first instant of the list which is found is set the tmax time If search automatic integration interval (tmin to tmax) is not selected it is possible to select different evaluation instants.

Input of Evaluation rules with help of the MAKRO Formula Editor

Ch 1 residual voltage 0 to 20 s Ch 2 impulse current 0 to 20 s Ch 3 a.c. voltage 0 to 20 s

Energy calculation with integration According to IEC 60099-4 W = Ures(Ul - Ures) 1/Z T = U I T => W = tmintmax u(t) i(t) dt tmin to tmax is the time in which the amplitude is greater then 0% of the peak value. If found automatic integration interval is on, the software tries to found the impulse end. WinTRAS evaluation settings: Ch1 [u(t)] evaluated with PK = peak value Ch2 [i(t)] evaluated with REC = rectangular, automatic calculation from tmin to tmax Ch5 = Ch1[u(t)] Ch2[i(t)]

Energy calculation without integration WinTRAS evaluation settings: Ch1 [u(t)] evaluated with PK = peak value Ch2 [i(t)] evaluated with REC = rectangular, automatic calculation from tmin to tmax WinTRAS formula without integral: W = CH1_Up CH2_Ip CH2_Td or

W = CH1_Up CH2_Ip (CH2_tmax - CH2_tmin)

WinTRAS formula: W[VAs] = INTEGRAL(CH5,CH2_tmin, CH2_tmax)

Operating Duty Tests

Ch 1 impulse current 0 to 50 s Ch 2 residual voltage 0 to 50 s Ch 2* residual voltage 0 to 250 s Ch 3 a.c. voltage 0 to 12 s Ch 4 a.c. current 0 to 12 s Display application of a.c. voltage 100 ms behind impulse current in Ch 2*. Display of reduction of a.c. voltagt resp. current after 10 seconds in Ch 3 and 4.




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WinTR-AS for Windows XP / Vista / Windows 7

WinTR-AS is the result of our long lasting know-how in software development for the handling of digital recorder measuring sytems and possibilities provided by modern operating systems like Windows XP /Vista / Windows 7. Now you are able to aquire, evaluate and process measured data within a standardized user-friendly

operating and control interface. All saved data is managed with an integrated dBase-compatible database. Because of this user has multiple opportunities of further data processing, e.g. it is now possible to generate reports using the WinTR-AS functions or to use applications like Microsoft Excel.

The user interface of WinTRAS is conform to the standards of Windows 95 and provides all usual controls of a modern windows application: Pull-down menu Toolbar for the most important functions with online hints for

each button contextsensitive help system Statusbar for messages

intuitive user interface

32-Bit software standardized intuitive user interface contextsensitive help system Multi-Threading (=parallel running

processes within the application) integrated database (dBase

compatible) Impulse evaluation acc. to IEC 60

and 1083 and evaluation of mathematical operation results of different channels

Formula-parser for generation of synthetic shapes

mathematical operation Macro-language for own evaluation

procedures automatic test-sequences

(configurable) remote control with OLE-automation remote acces via modem configurable user interface multilingual user texts (online

switchable) multilingual protocol-output with

preview Import of ASCII- and IEC-TDG-

curves possible integration in a network simple data transfer using the

clipboard of Windows (metafile format)

Support of color prints integrated hardware-diagnostics extensive database backup

functions

features

Meas. system 1 - database complete database with all

measured data

central access provided by

network server

Meas. system 2 - database

Meas. system n - database

Workstation 1 e.g. for

analysis of test objects

Workstation n

Workstation 2 e.g. for

statistics

Database-concept controls all tests performed:

subordinated windows for the output of wave shapes and evaluation results which can be arranged any way in the main window of the application

intuitive user dialogues for settings, evaluations, database- and file operations

Additional you have the possibility to activate a user menu panel, controlled by the function keys of the keyboard. This menu provides also important functions of the application, similar to the toolbar. You can change the properties of the user interface using the options menu of the menu bar.




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integrated database All saved records and evaluation results of WinTRAS are managed in a dBase-compatible integrated database. The data is organized in projects, which are identified by a definitely project number. The database structure offers a lot of advantages regarding data backup and further processing of the data: central backup using a network easy data transfer of large data quantity between

different measuring systems or workstations using a network

easy data access for additional workstations for evaluation, analysis, documentation etc.

easy digital recorder control All necessary settings for the operation of the digital recorder are made by userfriendly dialogue windows. All dialogues show the actual settings in form of tables for better orientation. Each row of a table represents a channel.

The preview area on the upper right side shows online the effects of changes of one of the parameters delay, measuring range, offset and trigger. Of course you have the possibility to save all settings.

TB 1 = 10 0 .0 0 M S /s

0 2 0 s 4 0 s 6 0 s 8 0 s 10 0 s 1 2 0 s 14 0 s

0%

10 %

30 %

50 %

70 %

90 %

1 00 %

C H 1

N o .: 2C H 1 A u s w .: L IU p = 1 36 0 VT 1 = 0 .8 8 sT 2 = 4 8 .9 s

Graphic export using the clip-board of Windows The export of WinTRAS graphics is a very useful feature if you have to create documentations. The actual content of the curve window and the status window will be transformed in a metafile and this will be finally copied to the clipboard. Please take note that the metafile format offers vectorgraphic. That means easy positioning and scaling of the graphic in the further processing

multiple display view options The display view dialogue allows the user to modify the appearance of the curve window. All settings are shown as well in form of a table with the parameters of one channel in a row. If specific channels are not needed, they can be turned off. As only displayed channels are saved to the database if the function save curves is activated, this option allows you to reduce the quantity of stored data. Thus all output and save operations work with the principle what you see is what you get. The hardcopy function produces a printout of the actual displayed screen using the maximum number of





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We offer further software packages in combination with the WinTR-AS main application. This allows you to choose a specific software-bundle depending on your measuring task:

Automatic Calibration acc. to IEC 1083 Calibration of H.V. dividers acc. to IEC 60

automatic evaluation Another indication for the efficiency of WinTRAS is the automatic evaluation. The user has the possibility to select an evaluation mode from a predefined set for each channel. This set contains for example impulse evaluations (LI/SI) according to IEC 60 and 1083. The user has the choice between manual and automatic evaluation. Additional mathematical operations with channels are allowed. Thus this feature is realized with an integrated formula parser, you have also the possibility to create synthetic wave shapes. Please take note that 80 channels are available for evaluations and channel operations.

integrated data backup tools WinTRAS provides also extensive tools for comfortable data backup of complete projects or single measured data. The following functions are available: backup restore delete You are able to determine any lokal drive or any network drive as destination for the data backup. Additional every save action of the user will force an automatic data backup of all database tables.

automatic protocol generation

WinTRAS offers an automatic protocol function for the documentation of test results. This operation uses the data of the actual selected project. The protocol contents a list with all saved evaluation results of the project and a number of further pages with graphic printout.

additional software packages

The following parameters are selectable:

protocol language number of graphics per page (1, 2, 4, 8) graphic printout with or without evaluation results

If all parameters are selected, a preview of the actual protocol will be started. The preview provides a visual check of the protocol, before the printjob is started. All graphics are created and printed as vectorgraphic.

Furthermore, the user has the possibility to save a completed protocol and reload it later for printing. Finally you are able to implement your own company logo at the protocol header for individual protocol design.

All Windows supported printers are of course accepted by WinTRAS.

Trafo-Test with Compare-Function Transfer-Function and Coherence-Function Tolerance-Band-Method Frequency Response Analysis Tap Change Operation Sequence Test Quality-Control software





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Makro Editor for automatic evaluation of custom-defined expressions

OLE / DCOM / ActiveX - Interface WinTR-AS For automatic control of recorder functions by custom programs Programming Examples in Delphi / C++ functions with their names; input-parameters / output-paramters with Delphi-type, in brackets C-type ; similar parameters types are available in basic or other programming languages variant IRemoteControl:: StartEvaluation () input nothing output: none This function starts evaluation. All current activated channels for evaluation will be evaluated with there current paramters. variant IRemoteControl:: StartRecord () input nothing output: none This function starts a record (analogue to call of ALT-A directly in WinTRAS)

Easy input of formulas and rules for their automatic calculation immediately after each new record, comprising Peak values of analogue lapses, e.g.Torque Moment, Current, Voltage, ... Contact Events recorded into Digital Measuring Channels Energy by Integration of Voltage and Current lapse during arrester tests Difference shape of individual channels Arithmetic Operations with two Channels before Evaluation




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Software-Applications Combined Voltage Test

Combined Voltage Test with AC and LI

This picture shows a combined voltage test with power frequency voltage AC with 143.7 kV peak and lightning impulse voltage LI with -498.5 kV peak.

With help of the Makro-Editor integrated in the WinTRAS-Software addi-tional test parameters shown under RESULTS can be calculated automati-cally after recording:

the AC voltage at the instant of the LI peak, UacTP the voltage drop Udrop of the AC voltage peak with respect to

UacTP the test voltage Utest as the difference of UacTP and Up of the LI

peak voltage the time difference alpha in ms or degree as the time difference

between AC peak and LI peak the time instant K3TP of the AC voltage the time instant K1TP of the LI voltage

With the evaluation switch formular the evaluation method for each individ-ual channel can be selected.

For channel 1 the selected LI evaluation automatically calculates the peak and time parameter and the overshoot beta.

For channel 3 the AC evaluation was selected.

Furthermore the macro with name PHASE-LI-K3 was selected, details later.

The AC evaluation rules were set to peak value and DC offset as also for peak time for phase calculation.

To eliminate digitzer noise the channel 3 is smoothed with 100 samples with help of an virtual auxiliary channel 4 (selectable for further evaluations) and then evaluated in the displayed evaluation interval tmin = 1000 ms to tmax = 1000 ms

Makro Editor

The Makro Editor allows definition of MAKROS which contain expressions with reference to evaluation results of the basic evaluations, , e.g. LI, SI, OI, IC, RECT, STEP. TIME, FFT, TFUM, ...

The expressions can be input in the formula field line for line, the variable names can be named free.

This expressions are evaluated immediately after the basic evaluations are performed and then the results are shown in the evaluation window under RESULTS on the right side of the display window.




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Waterfall Diagram for Type Tests on Cables

This picture shows a superimposed voltage type test with direct voltage d.c. and superimposed switching voltage SI displayed as waterfall diagramm with selectable No. of shapes, e.g. 14 shapes with horizontal offset of 4%.

The shapes can be preselected and moved horizontally and vertically with selectable offset values.

The test voltage was increased starting with No. 11 and the breakdown occurs with No. 14.

Software-Applications A.C. Routine Test - Waterfall Diagrams -

Superimposed Voltage Test

AC Routine Tests

This picture shows an A.C. Routine test with constant voltage starting at Start for approx. 15 Seconds, then the test volage was increase slowly until the breakdown occured.

The breakdown automatically triggers the digital recorder and switches the timebase from 10 kS/s upto 10 MS/s to show the breakdown behavior in detail.

In the information window right beside the display window the A.C. voltage immediately before the breakdown is shown as also further selected evalua-tion parameters e.g. the frequency and the test time

Digital Voltmeter inbuilt (peak, peak/2, rms)

for a.c. measurement of voltage and current a digital multimeter can be displayed for each physical recorder channel

START - STOP button for test time control

Superimposed Voltage Test on H.V. Cables with D.C. and SI

This picture shows a superimposed voltage test on H.V. Cables with D.C. and SI

Evaluation settings for superimposed voltage and initial peak amplitudes can be selected




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There are tree major effects influencing the measuring accuracy:

the sampling rate which makes an statistical error for the peak voltage which can be measured during a pulse calibration with steep low voltage impulses as the standard deviation of 20 impulses, see picture 1;

the response parameters of the digital recorder as also of the i.v. divider which makes an error in the rising area oft the impulse and in the peak of chopped impulses. The rise time of the digital recorder together with the i.v. divider should be so small, that for the 30% value (approx. at 30 ns) the input has settled. This is fulfilled for 5 times of the time constant resp. the first partial response time Ta with 30 ns / 5 = 6 ns. The risetime is approx. 2.2 times of the time constant and therefore sufficient with




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Application For the calibration and for performance tests and checks according to IEC 1083-1 und IEC-60-2 several calibration gen-erators with high accuracy are required which are optimally adapted to the digital impulse voltage measuring system to be tested. For this purpose a new family of precise calibration generators became devel-oped including the necessary software to perform the required calibrations and tests in the high-voltage testfield in ac-cordance with IEC 1083-1 and IEC 60-2 in an easy manner and in short time to save costs. The impulse calibration system KAL 1000 is a modular system to perform tests on complete impulse voltage meas-uring systems and on digital recorders for the measurement of high impulse voltages and impulse currents. The modular design allows an optimal KAL-configuration depending on the actual application. Additional, this modularity allows to up-grade or modify an existing KAL 1000 system in case of changing or additional requirements. The technical design of the impulse cali-bration system KAL 1000 was done con-sidering the international standards IEC 1083-1, Digital recorders for measure-ments in high-voltage impulse tests and the revision of IEC 60-2, at this time un-der consideration, the requirements for calibration generators in IEC 1083-1, Table 3 are fulfilled.

Calibration of Digital-Recorders according to IEC

1083-1 the calibration, performance check or performance test of the measuring ranges of the digital impulse voltage measuring systems TR-AS according to IEC 61083-1 may be performed either by the method pulse calibration or alter-natively by a separate calibration of volt-age and time with a step voltage calibra-tion and a time calibration.

Impulse-Calibration-System KAL 1000 Calibration-Software TRAS-KAL

according to IEC 61083-1, IEEE 1122 and IEC 60060-2, IEEE 4

range. With help of the control relay in the measuring system automatically the selected number of e.g. 20 measure-ments are performed and evaluated according to IEC 1083-1. The mean value of the selected num-ber of records and the largest devia-tion dedected is stored into a protocol-file for generation of the calibration certificate subsequently. The Basic System includes the elec-tronically controled d.c. voltage source with precise settable output voltage, available on a coaxial output and addi-tional two measuring taps for control measuring with an calibrated external d.c. voltmeter. In this way the calibration may be ref-erenced to a National Standard, e.g. to an approved DKD-testlab or the PTB. At the start of the automatic calibration procedur the value of this d.c. charge voltage must be input to the measuring system as reference level for the cal-culations.

Calibration Record The calibration results of a KAL 1000 impulse calibrator with shapes STEP, ZEIT, LI, LIC und SI performed with an high-resolution digital impulse voltage measuring system TR-AS 200-12 is documented in parts in the following calibration record:

Pulse Calibration The pulse calibration is performed with help of the impulse calibration genera-tors KAL-LI 0.84/60 (optional KAL-LI 1.56/60) for full and chopped lightning impulse voltage or with help of the im-pulse calibration generator KAL-SI 20/4000 for full or chopped switching impulse voltage. The time-to-chopping can be set to any value from 0.1 s to 10 000 s includ-ing the standard chopping time of 0.5 s.

Step Voltage Calibration The step voltage calibration is per-formed with help of the impulse calibra-tion generator KAL-STEP.

Time Calibration The time calibration is performed with help of the time mark generator KAL-TIME.

Calibration-Software TRAS-KAL The impulse calibration system KAL 1000 is controlled automatically by the digital impulse voltage measuring sys-tem TR-AS with help of an inbuilt or completable relay. The channels under calibration were connected separate or parallel to the respective output of the calibrator. After setting the d.c. charging voltage the calibration is done simultan on all channels for the selected measuring




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Calibration of Impulse-Measuring-Systems according to IEC 60-2

The automatic controlled calibration of the complete measur-ing system comprising the impulse voltage divider, the nec-cessary leads, the measuring cable and the digital impulse voltage measuring system TR-AS, follows by the parame-ter method with help of the unit-step-voltage-generator RIG 1000 and the calibration software TRAS-TEIL.

Unit-Step-Voltage-Generator RIG 1000 At the parameter method, applicable for performance check or test, the impulse scale factor and the time parameters of the measuring system are determined by measuring and evaluating the step response of the measuring system. The result can be compared with the manufacturers specification or with performance tests or checks performed in the past. For automatically calibration and generation of an calibration report the powerful software TRAS-TEIL with menu-oriented operations is available.

Test setup according to IEC 60-2

Impulse-Calibration-System RIG 1000 Calibration-Software TRAS-TEIL





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The calibration report includes the test results of the reference measurement REF in the past as also the actual test results of the AMS (approved measuring system). For each individual parameter the actual difference AMS/REF-1 is calculated and then compared with an earlier specified accepted differenc. The test result "accepted" or "not accepted" automatically is written to the rightmost column. E.g., the determination of the impulse scale factor shows in the selected time interval 0.4 - 20.0 s negligible deviations from the specified value of the manufacturer. The scale

The determination of the impulse scale factor and the response parameters of the complete measuring system according to IEC 60-2 is done with the unit step voltage generator RIG 1000 using a repetitive sampling methode included in the software TRAS-TEIL, which allows sampling rates of 1 to 5 GHz corresponding to sampling intevals of 1 ns downto 200 ps with our digital recorders TR-AS.

The unit step voltage generator RIG 1000 is controlled automatically by the digital impulse voltage measuring system TR-AS with help of an inbuilt or completable relais. For example, the performance check of an 3 MV impulse voltage divider in the h.v. testfield of an big transformer manufacturer was performed, the test results are shown in the following. First of all the step response g(t) is measured, whereby a sampling rate of 1 GHz corresponding to 1 ns time resolution yields a satisfying accuracy within a short testing time. The response parameter of the measured step response g(t) and the time behavior of the response time T(t) by integration of the function 1-g(t) automatically is calculated by the AT-computer inside the measuring system.

Calibration of a 3 MV impulse voltage divider in a big transformer testfield The evaluation of the response time T(t) follows inside of an selectable time intervall tmin to tmax

Definition of response parameters and settling time

The calculated results of the measurment are: overshoot F actual impulse scale factor O1 virtual origin, set to t=0 To initial distortion time Ta partial response time TN experimental response time at t=tmax ts settling time tmin begin of evaluation tmax end of evaluation

For automatically determination of the settling time the limit-ing functions T 0.02t are calculated and displayed together with the response time T(t). The latest point of intersection of T(t) with the limiting functions is the wanted settling time according to IEC 60-2.

Impulse-Calibration-System RIG 1000 Calibration-Software TRAS-TEIL





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Technical Data: KAL 1000 / RIG 1000

wave form chopping time output voltage range for input range full wave lightning impulse LI 0,84/60 100 ns20 ms 50 V to 1000 V 50 V - 2500 V front-chopped lightning impulse, Tc=500ns 500 ns 50 V to 750 V 100 V - 1800 V switching impulse SI 20/4000 100 ns20 ms 50 V to 1000 V 50 V - 2500 V switching impulse SI 250/2500 100 ns20 ms 50 V to 1000 V 50 V - 2500 V STEP Voltage 10 V to 1000 V 10 V - 2500 V

Calibrator Basic-Device KAL 1000 for supply and control of the KAL-Generators described below, rack mount with power supply, line filter, built into a 19" housing

design cassette 4 HE, 42 TE housing (BxHxD) 500x200x320 mm or 19" rack mount weight approx. 10 kg

H.V. Load Circuit, electronically controled design in basic device charge voltage, adjustable with 10-turn-potentiometer 0 - +1000 V positiv setting-accuracy < 0.1 % digital display LED 0-1000.0 V measuring-accuracy 0.1 % 2 digit charge time modul-dependent 1 .. 10 s output frontside coaxial measurement 2 plugs max. cable length unlimited load resistance >= 200 kOhm

Control Electronic design in basic device releasing manual key BNC-input TTL LO-level or external relais impulse output switching gap SG 5 Vp, BNC

time-to-chopping adjustable 0.1 - 10 000 s step 0.1 s quarz-timebase 10 MHz, 100 ppm impulse output chopping gap CG 5 Vp, BNC

Step-Voltage-Generator KAL-STEP for the step calibration of the inputs of digital impulse voltage measur-ing system according to IEC 1083-1

design in basic device charge voltage base-device 0 .. +1000 V switching-device electronically output short-circuited falltime < 10 ns (90/10%) impulse output BNC 10 .. 1000 V polarity negative step output-resistance 50 Ohm load-resistance >= 200 kOhm cable-length 1,5 m accuracy step-voltage 0.5% / 0.2% 1)

Lightning-Impulse-Generator KAL-LI 0.84/60 for pulse calibration of the digital impulse voltage measuring system according to IEC 1083-1

design cassette 12 TE charge voltage basic-device 0 - +1000 V switching-device electronically chopping-device electronically charge-capacity 0.6 F impulse output BNC 50 .. 1000 V 2) output-resistance 20 Ohm cable-length 1,5 m shape standard 0.84/60 s optional 1.56/60 s chopping time selectable 0.1 .. 10 000 s accuracy peak-voltage 1% / 0.2% 1) front-time 2% / 0.5% 1)

time-to-half-value 2% / 0.2% 1) time-to-chopping 2% / 1% 1) according to IEC 1083-1 table 3

Switching-Impulse-Generator KAL-SI 20/4000 for pulse calibration of the digital impulse voltage measuring system according to IEC 1083-1.

design cassette 12 TE charge voltage basic-device 0 - +1000 V switching-device electronically chopping-device electronically charge-capacity 1 F impulse output BNC 50 .. 1000 V 2) output-resistance 20 Ohm cable-length 1.5 m shape standard 20/4000 s optional 250/2500 s chopping time selectable 0.1 .. 10 000 s accuracy peak-voltage 1% / 0.2% 1) time-to-peak 2% / 0.2% 1) time-to-half-value 2% / 0.2% 1) time-to-chopping 2% / 1% 1) according to IEC 1083-1 table 3

Timemark-Generator KAL-ZEIT For time calibration of the digital impulse voltage measuring system according to IEC 1083-1.

design in base device time-intervall 20 ms 0.01% output BNC squarewave 0 / 5 V, TTL-level

Unit-Step-Voltage-Generator RIG 1000 (H) for determination of the impulse scale factor and the response pa-rameters of the high voltage impulse measuring system with the unit step method according to IEC 60-2. The generator is placed on the floor or wall in the h.v. testfield and connected to the h.v. divider.

design cassette 4 HE, 42 TE housing (BxHxD) 260x200x320 mm weight approx. 4 kg

charge voltage coax-input 0 - +1000 V feeding basic device via coaxcable 20 m type H optionally inbuilt h.v. supply

Charge capacitor charge-capacity 5.3 F

switching-device electronically output-resistance 2 Ohm risetime < 10 ns (10/90%) releasing BNC-input TTL LO-level or relay (meas.system) via coaxcable 20 m

impulse output 0 .. 1000 V polarity positive or negative connection to i.v. divider load >= 5 kOhm || 10 nF accuracy peak value 0.1% stat. power supply battery inside

1) long term stability / short term stability 2) efficiency < 1 Technical data and design subject to modification without notice.




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DEUTSCHER KALIBRIERDIENST (DKD)

Kalibrierlaboratorium fr elektrische Impulsgren Calibration laboratory for electrical impulse parameter

Trger holder

akkreditiert durch die

accredited by

DR. STRAUSS MESSTECHNIK GMBH

Akkreditierungsstelle des DKD bei der PHYSIKALISCH-TECHNISCHE BUNDESANSTALT (PTB)

DKD-K-11701

Kalibrierdienste in der EA / Calibration Service inside the EA

Akkreditierungsverfahren im DKD (Deutscher Kalibrierdienst)

Accreditation procedure of the DKD (German Calibration Service)

Der Deutsche Kalibrierdienst (DKD) ist ein Zusammenschluss von Kalibrierlaboratorien aus Industrieunternehmen, Forschungsinstituten, technischen Behrden, berwachungs- und Prfinstitutionen. Diese Laboratorien werden von der Akkreditierungsstelle des Deutschen Kalibrierdienstes akkreditiert und berwacht. Sie fhren Kalibrierungen von Messgerten und Maverkrperungen fr die bei der Akkreditierung festgelegten Messgren und Messbereiche durch. Die von ihnen ausgestellten DKD-Kalibrierscheine sind ein Nachweis fr die Rckfhrung auf nationale Normale, wie sie von der Normenfamilie DIN EN ISO 9000 und der DIN EN ISO/IEC 17025 gefordert werden.

Kalibrierungen durch DKD-Laboratorien geben dem Anwender Sicherheit fr die Verlsslichkeit von Messergebnissen, erhhen das Vertrauen der Kunden und die Wettbewerbsfhigkeit auf dem nationalen und internationalen Markt. Sie dienen als messtechnische Grundlage fr die Mess- und Prfmittelberwachung im Rahmen des Qualittsmanagements.

The Deutscher Kalibrierdienst (DKD) is an association of calibration laboratories of industrial firms, research institutes, technical authorities, inspection and testing institutes. These laboratories are accredited and supervised by the Accreditation Body of Deutscher Kalibrierdienst. They calibrate measuring instruments and material measures for measurands and measurement ranges specified within the framework of accreditation. The DKD calibration certificates issued by these laboratories prove traceability to national standards as required in the standards family ISO 9000 and the ISO/IEC 17025.

Calibrations carried out by DKD laboratories allow the user to trust in the reliability of

Das Bild zeigt das akkreditierungsverfahren im Deutschen Kalibrierdienst DKD

The picture show the Accredidation procedure of the German Calibration Service DKD




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Die Akkreditierung erfolgte am 06.06.1994 durch die Physikalisch-Technische Bundesanstalt (PTB), Deutscher Kalibrierdienst (DKD), vertreten im Deutschen AkkreditierungsRat als Kalibrierlaboratorium fr elektrische Impulsgren unter der DAR-Registriernummer DKD-K-11701. Die Firma DR. STRAUSS MESSTECHNIK GMBH ist somit das erste Unternehmen, welches Impuls-Kalibrier- und Meeinrichtungen fr Stospannungs- und Stostromprfungen rckfhrbar auf nationale Normale kalibrieren darf und hierfr Kalibrierscheine ausstellt, die innerhalb der WECC in ganz Europa anerkannt werden. Die fr die Einrichtung des Kalibrierlaboratoriums notwendigen Bezugs-Normal Meeinrichtungen TR-AS 100-10/12, TR-AS 200-14 und KAL 1000 kommen aus der eigenen Fertigung und sind an die nationalen Normale bei der PTB angebunden. Die hierbei durch die PTB besttigte hohe Qualitt unserer Produkte, dokumentiert durch ausfhrliche Typenprfungen unter Beachtung der einschlgigen Normen, findet ihren Niederschlag in den fr unsere Kunden bestimmten Produkte. The accreditation was performed on 06.06.1994 by the Physikalisch-Technische Bundesanstalt (PTB), Deutscher Kalibrierdienst (DKD), represented in the Deutschen AkkreditierungsRat as calibration laboratory for electrical impulse parameter with DAR registration number DKD-K-11701. DR. STRAUSS MESSTECHNIK GMBH therefore is the first company, which may calibrate impulse measuring and calibration systems for high voltage impulse tests with traceability to national standards and issues calibration certificates recognized inside the WECC in Europe. The Reference Standards of measurement TR-AS 100-10/12, TR-AS 200-14 and KAL 1000 necessary for furnishing the calibration laboratory come from our own production and are traced to national standards at the PTB. The high quality standard of this equipment confirmed by the PTB herewith and documented in detailed type test reports under consid-eration of the respective standards, finds its reflection in the products delivered to our customers, too.

Organisationsstruktur zur Rckfhrung von Impulsspannungs-Mesystemen auf nationale Normale in Deutschland Calibration system to establish traceability of impulse voltage measuring systems to national standards in Germany

Normal Anwender Voraussetzung der Kalibrierung Meeinrichtung Hersteller Typ Meunsicherheit Dokumentation der

Kalibrierung Standard of

measurement User supposition for

calibration measuring system manufacturer type measuring uncertainty documentation of

calibration

Nationales Normal PTB

Gleichspannung Impulsmessung PTB-Kalibrier- schein

National Standard

direct voltage impulse measurement

PTB-calibration certificate

Bezugs-Normal Meeinrichtung

DKD Kalibrierlaboratorium bei DR. STRAUSS

GMBH PTB- Kalibrierschein

Impuls-Kalibriergenerator

Digitalrecorder Digitalvoltmeter

DR. STRAUSS KAL 1000

DR. STRAUSS TR-AS 200-14

Solartron 7150

LI, SI / LIC peak: 0,5% / 0,7%

time: 2%

STEP: 0,4%

DKD-Kalibrier schein

Reference Standard of measurement

DKD Calibration laboratory at DR. STRAUSS GMBH

PTB- Calibration Certificate

digital recorder impulse calibr.

generator digital voltmeter

DKD Calibration Certificate

Werks-Normal Referenz-Mesystem

Innerbetriebliches Kalibrierlaboratorium DKD- Kalibrierschein

Impuls-Kalibriergenerator

Digitalrecorder

KAL 1000 TR-AS 100-10/12 TR-AS 200-12-14

LI, SI / LIC peak: 1% / 2%

time: 2% STEP: 0,5%

Werks- Kalibrierschein

Reference measuring system

Calibration laboratory of organisation

DKD-Calibration Certificate

impulse calibr. generator

digital recorder

Works Calibrat. Certificate

Gebrauchs-Normal Me-/Prfsystem

Prffeld, betriebliche Bereiche Werks- Kalibrierschein Digitalrecorder

TR-AS 25-8/12 TR-AS 100-8/10/12 TR-AS 200-12-14

LI, SI, LIC peak: 2% / 3%

time: 4% Werks- Prfschein

Approved measuring system

Test laboratory of organisation

Works-Calibrat. Certificate digital recorder Works Test Record

Akkreditierung durch die PTB / Accredidation by PTB (DIN EN ISO/IEC 17025)




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DKD Kalibrierschein (Muster) DKD Calibration Certificate (Example)

Das Kalibrierlaboratorium bietet die Kalibrierung von

Impuls-Kalibriergeneratoren Sprunggeneratoren

Digitalrecordern Stovoltmetern

an und stellt dafr DKD-Kalibrierscheine aus, welche die Rckfhrung auf nationale Normale zur Darstellung der physikalischen Einheiten in bereinstimmung mit den Inter-nationalen Einheiten (SI) dokumentieren.

The DKD Calibration laboratory offers the calibration of impulse calibration generators unit step voltage generators

digital recorders impulse voltmeters

and issues DKD-Calibration Certificates which document the traceability to national standards which realize the physical units of measurement according to the international system of Units (SI).

PTB: Die Physikalisch-Technische Bundesanstalt in Braun-schweig ist das metrologische Staatsinstitut und die tech-nische Oberbehrde fr das Mewesen in Deutschland. Sie entwickelt und bewahrt die "nationalen Normale" zur Darstel-lung der SI-Einheiten und stellt in Zusammenarbeit mit Staatsinstituten anderer Lnder deren Vergleichbarkeit in internationalem Rahmen sicher.

DKD: Im Deutschen Kalibrierdienst sind Kalibrierlaborato-rien der Industrie und anderer Institutionen zusam-mengeschlossen, die von der PTB nach festgelegten Kriterien akkreditiert und berwacht werden.

Kalibrierlaboratorium: In den Betrieben werden Kali-brierlaboratorien betrieben, welche vom DKD kalibrierte Ref-erenz-Mesysteme als Werks-Normale zur Kalibrierung der Me- und Prfsysteme im Prffeld einsetzen (kalibrierte Mesysteme).

PTB: The Physikalisch-Technische Bundesanstalt at Braun-schweig is the metrological institute of the Federal Republic of Germany and has by law the responsibility for the national standards of measurement. PTB develops the national stan-dards of measurement for representating the international units SI and is responsible for the necessary international comparisons.

DKD: In the German Calibration Service (Deutscher Kalibri-erdienst) calibration laboratories of industry and other institu-tions are jointed, which are accredited and supervised by PTB according to fixed criterions.

Calibration laboratory: The calibration laboratories are installed within the organisation and hold the reference meas-uring systems calibrated by DKD to calibrate the measuring and test systems used in the test laboratories (approved measuring systems).

DEUTSCHER KALIBRIERDIENST (DKD)

Kalibrierlaboratorium fr elektrische Impulsgren Calibration laboratory for electrical impulse parameter




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Electronic Voltage Transformer EVT

Voltage transformers usually are inductive types designed with single stage coils. For higher system voltages upside 110 kV the manufacturing costs for inductive v.ts and their dimensions increase overproportionally. Therefore a cost-efficient alternative to the inductive high-voltage part is desirable: e.g. a capacitive voltage divider with electronic low-voltage part. For GIS the h.v. capacitor can be integrated easy and place-saving as a coaxial cylinder capacitor inside the switchgear. For other applications a compressed gas capacitor with few

Preamplifier EVT-VC: class 0,1/0,2 or 0,5 for 0,8 - 1,2 x UN high-voltage capacitor CH=10 pF adjustable from +5% to -20% with inbuilt precision potentiometer with 0.01% resolution rated voltage 400000/3 V : 6,53 V or any other depending from h.v. capacitor rated burden 0.1 VA

Measuring Amplifier EVT-M05: class 0,1/0,2 or 0,5 for 0,8 - 1,2 x UN rated voltage 6.5/3 V : 100/3 V rated burden 25 VA

Protection Amplifier EVT-P3: class 3P for 0,05 - 1,5 x UN rated voltage 6.5/3 V : 100/3 V rated burden 5 VA

Protection Amplifier EVT-P3EN for connection to preamplifiers EVT-VC of phases L1, L2 und L3. rated voltage 3x6.5/3 V : 100/3 V rated burden 5 VA

primary short circuit with oscillating recovery voltage

short interrupt with trapped charges

400 kV GIS at BEWAG Berlin

pF capacity can be used. For the classical capacitive v.t. the inductive part can be substituted to an electronic low-voltage part to eliminate the known resonant problems and sawtooth frequencies and offers better transient behavier. The excellent long-term stability of electronic components together with suitable high-voltage capacitors allow the design of precise voltage transformers of class 0,1 which can be calibrated on site with burdens up to 25 VA at 100/

Common Data: 2 redundant power supplies lumuniscence diode for ready 4 contacts (make and break) and lumuniscence diode for amplification faulty above 2.5% in 0.8 - 1.9 x UN or supply voltage faulty above 20% lumuniscence diode for stored faults clear-key for reset stored fault fault detection time = 2 ms reaktion time of contakts < 6 ms

Saturation effects caused by d.c. transiens are not possible because of the direct coupled iron-free output stage without transformer.

Short-Circuit Protection Any load between no load and short circuit does not disturb the output amplifier.

Reverse-feeding Protection of Output: Any voltage feeded to the output below




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For further informations please contact: Manufacturer:

DR. STRAUSS MESSTECHNIK GMBH D-96173 Oberhaid / D-96148 Baunach

Office +49 9503 504 3568 Fax +49 09503 504 6150 Works +49 9544 987 1204 Fax +49 09544 987 1726

Representative

Tapchanger Test Plant at MR Reinhausen Germany equipped with TR-AS Measuring Systems

Systems based on TR-AS 10-12 with 8 analogue inputs for measuring voltage, current and torque and 32 digital inputs for contact events. Software for automatic routine test with verification of test results with given parameters.


Tapchanger Test Plant more than 20 test plants at MR Reinhausen, Germany equipped with TR-AS Measuring Systems

2 product specification

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