ht cable fault locator- van mounted · and xlpe ht underground power cables of the ratings 11, 22...

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Technical specification for

HT Cable Fault Locator- Van Mounted

Specification no – PMC/INST/004/0/12

Prepared by Checked by Reviewed by Approved by Rev Date

AD CK SS/BC SP 2 8/5/2019

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Index

1.0 Scope of supply......................................................................................................... 3

2.0 Distribution Network .................................................................................................. 3

5.0 Technical Specification: ............................................................................................. 5

6.0 Safety Features ......................................................................................................... 8

7.0 General …………………………………………………………………………………… 8

8.0 Packing & Delivery .................................................................................................... 9

9.0 Deviation ................................................................................................................... 9

10.0 Demonstration ............................................................................................................ 9

List of Annexure .................................................................................................................. 10

Annexure A Test and Inspection Plan …………………………………………………… 10

Annexure B Guaranteed Technical Particulars ( By Bidder) .......................................... 11

Annexure C Technical Acceptance Sheet .................................................................... 14

Annexure D Technical Deviation Sheet......................................................................... 15

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Technical Specification for Van Mounted Cable Fault Locator

1.0 Scope of supply The specification covers design, manufacture, supply, testing, and maintenance of cable fault locating and cable testing and suitable in future for integrating Diagnostic (TD & PD) system duly mounted in van. The salient features of the system are: The equipment shall be suitable for testing, locating & pinpointing conductor and insulation faults of low and high resistance, intermittent or flashing nature in PILC and XLPE HT underground power cables of the ratings 11, 22 and 33 kV. The system should support cable fault location and all type of cable testing and diagnostic for installation, commissioning and maintenance testing in accordance with the valid IEC 60060-3, IEC 60502 and IEEE 400.2-2013 standards and regulations. It should be suitable for the complete range of cable types and their accessories in all voltage ranges from 415 V to 33 kV. This shall include Design, manufacture, testing at manufacturer’s works before dispatch and packing, delivery of material to AEML stores with equipment fitted in the AEML supplied van ( Force Traveller – 3350)and submission of documents to purchaser.

2.0 Distribution Network 2.1 System Voltage and Frequency: The rated voltages are 11,22 and 33 kV

subject to statutory variation of +6% and –9% as per Indian Electricity Rules-1956 as amended up to date. The system frequency is 50 Hz ( 3%).

2.2 Humidity and Weather conditions: Maximum ambient temperature up to 45

C and maximum humidity up to 95% during monsoon season.

2.3 Distribution Network: 11, 22 and 33 kV distribution underground cables with Mixed sections PILC + XLPE upto 20km cable length.

2.4 Switchgears: Metal clad indoor SF6 / Vacuum / Air blast / Oil type circuit

breakers of the ratings 11, 22 and 33 kV at Receiving Stations and metal-clad indoor 11 kV Ring Main Units / Oil circuit breakers / Oil fuse switches at substations.

3.0 Description

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The cable testing and fault locating kit shall consist of pre-locator, DC pressure testing, Surge generator, Seismic fault detector and VLF generator suitable for integration in future with Tan Delta and Partial Discharge testing. The bidder should offer all the following equipment with independent control and control through master PC.

3.1 Digital Fault Locator (pre-locator) Employing:

3.1.1 Pulse Echo method 3.1.2 Impulse Current method up to 32kV 3.1.3 Arc Reflection method to 32kV 3.1.4 Arm plus method up to 32kV (ARM + 4kV additional surge, Double

surge method) /SIM,MIM/DC MIM/Differential Impulse method 3.1.5 Voltage Decay Plus up to 80kV (Decay+ 4kV additional surge, Double

surge method) 3.1.6 Decay method up to 80kV

3.2 DC pressure testing and Surge Generator. 3.3 Seismic Fault Detector.

4.0 Digital Fault Locator (pre-locator):

Pre-location of faults in cables shall be carried with the help of highly sophisticated menu driven microprocessor based Digital Fault Locator. The equipment should have the following features:

4.1 Mains operated. 4.2 Built in oscilloscope to record (by means of external trigger) and display. Waveforms generated by the breakdown of the fault. 4.3 Cursors for taking readings. Automatic Indication and marking of fault

location in all modes. 4.4 Dielectric selection facility, thereby velocity of propagation. 4.5 Range selection facility. 4.6 Memories to auto store the curves and comparison of the curves. 4.7 Horizontal and Vertical shifting of the displayed waveforms. 4.8 Gain selection and enlargement facility without loss of resolution and

Accuracy. 4.9 Facilities to pre-locate fault using Pulse Echo Method, Impulse Current Method, / Arc Reflection Method / ARM Plus method, Secondary Impulse

method/Multiple Impulse Method/SIM MIM Conditioning and Voltage Coupler / Decay Method.

4.10 Windos /Linux based centralized control for all modes of testing, VLF, Tan Delta, partial discharge DC Pressure test, fault burning.

4.11 USB Interface for memory stick, printer and PC

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5.0 Technical Specification: The Van Mounted Fault Testing Set shall confirm to following Technical Parameters – Technical Parameter AEML Specification

MMI /IPC(model integrated) Integrated unit

Windows/Linux based centralized control for all modes of testing, DC pressure test, fault burning required

Range >500 km

Pulse width 20ns to 10 micro second

V/2 range 45-150m/µS

Input Impedance / o/p impedance / compensation min.50 ohms

Accuracy 0.1%

Resolution 1.5m

Sampling Rate Minimum 400 MHz

Horizontal Expansion x2, x4, x8, and x16 of full screen width

Gain 0….20db amplification

Measurement system Automatic adjustment of cursor for prelocation of fault in all modes.

Memory Auto Save

Display VGA Display, minimum 20 Inch Display

Interface RS232/USB for PC

Storage and Protocol Software with downloading facility.

No. of phases that can be tested at a time 1

Separate HV and control modules Required

Emergency OFF Required

Ground safety interlock Required

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Automatic discharging devices Required

Testing Methods

Insulation Resistance with PI Value At least 1kV inbuilt and 10kV external IR Tester

Pre location Methods:

Pulse Echo method Required

Arc Reflection method (0-4kV, 0-8kV, 0-16kV, and 0-32kV)/SIM Required

Arc Reflection method Plus (0-4kV, 0-8kV, 0-16kV, and 0-32kV) with 4kV additional surge / MIM/DC MIM

Required

Impulse Current single phase (0-4kV, 0-8kV, 0-16kV, and 0-32kV) Required

Voltage Decay up to 80kV( For High Resistance Faults) Required

Voltage Decay Plus with additional 4kV surge Required

Proof Burn Required

DC Pressure Testing Integrated unit

D.C. Output Voltage 0-80 kV

Continuous current at full voltage(mA) 20mA @ full voltage

Short Circuit Current current trip at 250 mA

Provision of Timer for DC testing Required

Surge Generator

Output voltage

0 - 32 kV suitably in 4 ranges. Continuously variable on all ranges mandatory ranges 0-4kV, 0-8kV, 0-16kV, and 0-32kV.

Output Joules Min.2400 J at each voltage range

VLF Unit

Output voltage (Vrms) 38.2 kV

Leakage Current Measurement 0-7mA

Output voltage (V peak) 54 kV

Output current Vendor to specify

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Frequency 0.01-0.1 Hz

Waveform Sinewave [R2]

Output Suitable for 15 km of cable Future expansion facility shall be available for Tan delta & PD measurement for 11kV & 33kV Cables Required. Cables

Earthing Cable Drum Mounted. 50 m Earthing cable of 16 sq.mm. multi stranded flexible copper with rubberized insulation

Power Supply Cable Drum Mounted. 75 m, 2.5 sq.mm 3 Core Cable

H.V. Cable Drum Mounted. 50 m single core coaxial cable with special insulating material (EPR)

Metering Voltage, current, flashover voltage, resistance, time.

Additional provision Fault burning.

Van Set Up

Floor and Interior cover with hardwearing plastic sheet above the copper sheet used for Earthing the van body.

Required

Control Unit should be in operator’s cabinet. The High voltage system should be in High Voltage cabinet i.e. back side of control unit. ( Separate Control Unit and High Volatge Unit)

Required

HV Compartment accessible through rear door only with safety interlock. Required

Provision for keeping drawings, tools, Test Plugs and other accessories. Required

Transparent Fiber sheet to isolate control and HV compartments. Required

Provision of sufficient lighting in both control & HV compartment (Wiring in Van). Required

Seating Arrangement for Operator Required

Seating Arrangement for Two more Person excluding Driver Required

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Pick Up Set Required

High voltage bridge based on Murray loop principle with following feature: O/p Voltage :10kV DC bipolar Display: Touch Screen o/p current:200mA mode of operation: Mains and Battery operated

Required

Additional Features Required in Van.

Beacon / Red light indicator for testing in progress Required

Guarantee Minimum 5 Years

Safety Features

HV Compartment and Controlling Unit should be separate. Required

Note :Minimum requirement specified in technical specification. However vendor offer , has to be based on the best spec & testing methodology available with the model offered [R2]

6.0 Safety Features The instrument should have a built-in automatic discharge feature. An emergency trip push button in control compartment shall be provided to switch OFF all equipment. A separate circuit to check healthiness of station earth should be provided. Voltage rise between the chassis of vehicle and the immediate surroundings should be suppressed by means of earth rod (spike) and auxiliary earth connection. All equipment shall be discharged on supply failure or disconnection of the unit. The safety controls must be fully integrated in central system control. Any operating error must be eliminated by system.

7.0 General 7.1 The supplier should forward relevant technical data, circuit diagram and

operating manual of the equipment offered. A list of various clients to whom these equipment are supplied also should be sent with the offer.

7.2 The supplier should indicate the performance guarantee period of all the

equipment offered. The guarantee period should be of minimum five years. 7.3 The offer shall clearly indicate in details various instruments and accessories

of the equipment and their prices individually.

7.4 The bidder shall submit at least 1 PO copy of offered model.

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7.5 The offer shall accompany a drawing showing arrangement of instrument

mounting in the van offered as well as provisions made for accommodation of other accessories, equipment etc.

7.6 The supplier shall demonstrate the HV cable testing system offered and

successfully test and pinpoint 11, 22, 33 kV cable fault in our REL system or else where using the different methods offered. Also at supplier’s works the test facilities listed in ‘Annexure-I’ demonstrating performance of the set shall be arranged.

7.7 Bidders should give point wise table of compliance for all the clauses in the

specification as mentioned below.

8.0 Packing & Delivery

4.1 Packing protection Against shocks, vibration & corrosion, damages during transportation

4.2 Packing identification labels To show purchaser name, PO number, quantity, Manufacturer serial number.

4.3 Handling instruction To be marked on packing boxes

9.0 Deviation

9.1

Any deviations or non-compliance to specification to be submitted in writing by Vendor. Bidder to submit copy of specification & GTP along with company seal & signature on each page. Details of alternate offers should be mentioned.

10.0 Demonstration

10.1 The product will be approved only after successful demonstration on field.

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List of Annexure Annexure A– Test and Inspection Plan.

Annexure-A

Following Tests shall be included in the Inspection Plan: 1. Physical arrangement of instrument mounting in the van as well as provisions

made for accommodation of other accessories considering convenient movement of operator.

2. Voltages build up at open circuit lead terminals on all ranges provided in D.C.

mode. 3. Leakage current indication at various ranges with faulty cable/ HV lead

terminals shorted. 4. Surging set burden and Joules capacity with faulty cable sample on all ranges

provided. 5. Fault prelocation accuracy of methods available on C.R.O. and other facilities

provided.

Measurement of Earth resistance, leakage current, voltage rise between the chassis of vehicle and instrument body as well as immediate surroundings

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Annexure B Guaranteed Technical Particulars ( By Bidder)

Sl No Technical Parameter AEML Specification Data By Bidder 1 MMI (model integrated) Integrated unit 2 Microprocessor based centralized

control for all modes of testing, DC pressure test, fault burning

Required

3 Output pulse Voltage vendor to provide 4 Measuring Range >500 km

5 Pulse width 20ns to 10µS 6 V/2 range 45-150m/µS 7 Input Impedance / o/p impedance /

compensation min.50 ohms

8 Accuracy 0.1% 9 Resolution 1.5m

10 Sampling Rate > 400 MHz 11 Horizontal Expansion x2, x4, x8, and x16 of full screen

width

12 Gain 0…20db amplification

13 Measurement system Automatic adjustment of cursor for prelocation of fault in all modes.

14 Memory Autosave Display VGA Display , 20inch display

15 Interface RS232 for PC 16 Storage and Protocol Software with downloading

facility.

17 No. of phases that can be tested at a time

One phase with multi trace feature

18 Separate HV and control modules Required 19 Emergency OFF Required 20 Ground safety interlock Required 21 Automatic discharging devices Required 22 Testing Methods

a Insulation Resistance with PI Value 10 kV tester integrated with MMI b Prelocation methods c Pulse Echo Vendor To Specify d Arc Reflection method 0-8/16/32 kV e Arc Reflection Plus Double impulse at 0-8/16/32 Kv f O/P Pulse Voltage IN Arm Plus Mode 1500-2000 V g Impulse Current single phase 0-8/16/32 Kv

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Sl No Technical Parameter AEML Specification Data By Bidder

h Voltage Decay (For High Resistance Faults)

0-40 Kv

i Proof Burn Vendor To Specify j DC Pressure Testing Integrated unit k D.C. Output Voltage 0-40 kV l Continuous current at full

voltage(mA) 20mA @ full voltage

m Short Circuit Current current trip at 250 mA n Additional provision Vendor to provide o Provision of Timer for DC testing Required

23 Surge Generator a Output voltage 0 - 32 kV suitably in 3 ranges.

Continuously variable between 0 and max value on all ranges Preferable ranges 0-8, 0-16, 0-32.

b Output Joules Min.2400 J at each voltage range/ Vendor to offer best spec in the offered model

c Timer-Three ranges with pulses/minute specified for automatic surging

Required

24 VLF Unit a Output voltage (Vrms) 38.2 Kv/ Vendor to offer best

spec in the offered model

b Leakage Current Measurement 0-7 milli-amps c Output voltage (Vpeak) 54 kV d Output current Vendor to specify e Frequency 0.01-0.1 Hz f Waveform Sinusoidal g Output Suitable for 15 km of cable.

25 Cables a Earthing Cable Drum Mounted. 50 m Earthing cable of 16 sq.mm.

multi stranded flexible copper with rubberized insulation

b Power Supply Cable Drum Mounted. 50 m, 2.5 sq.mm 3 Core Cable c H.V. Cable Drum Mounted. 75 m single core coaxial cable

with special insulating material (EPR)

26 Metering Voltage, current, flashover voltage, resistance, time.

27 Additional provision Fault burning.

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Sl No Technical Parameter AEML Specification Data By Bidder 28 Van Set Up

a Floor and Interior cover with hardwearing plastic sheet above the copper sheet used for Earthing the van body.

Required

b Control Unit should be in operator’s cabinet.

Required

c The High voltage system should be in High Voltage cabinet i.e. back side of control unit.( Separate Control Unit and High Volatge Unit)

d HV Compartment accessible through rear door only with safety interlock.

Required

e Provision for keeping drawings, tools, Test Plugs and other accessories.

Required

f Transparent Fiber sheet to isolate control and HV compartments.

Required

g Provision of sufficient lighting in both control & HV compartment (Wiring in Van).

Required

h Seating Arrangement for Operator Required Seating Arrangement for Two more

Person excluding Driver Required

29 Pick Up Set With Navigator facility 30 Additional Features Required in

Van.

a Beacon / Red light indicator for testing in progress

Required

b Guarantee Minimum 5 Years 31 Safety Features a HV Compartment and Controlling

Unit should be separate. Required

32 On Site Training & Demonstration Required for 20 executives in 3 batches

GTP of Tan Delta & PD Unit to be added by the bidder. Vendor to offer best specification in the offered model

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Annexure C Technical Acceptance Sheet

Technical Acceptance Sheet

(To be filled in by Vendor with submission of Offer)

Vendor Name :

Client Name :

Product Description :

Reference Document Name / No. : < as below or Specify >

We hereby confirm compliance of our product / system with RInfra’s requirements, as detailed below.

S. No. Document Name / No. YES

NO -- with Remarks Accepted –

except Deviations *

Not Accepted

1 Technical Specifications

2 GTP

3 BOQ

4 List of Past Supply’s in India in the last 4yrs

5

Details of Qualified service engineers in

India certified & Trained by OEM &

Agency Details

*Note: For the Deviation details, please refer Sheet No.2

--------------------------------------------------- Vendor’s Name / Stamp / Signature

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Annexure D Technical Deviation Sheet

DEVIATION SHEET

(To be filled in by Vendor with submission of Offer)

We hereby confirm compliance of our product / system with AEML Technical Specifications / GTP / BOQ , if any (strike off whichever not applicable) -- in all respects / subject to the following Deviations listed below.

S.

No. Document

name Clause no. Deviation Reasons Merit

--------------------------------------------------- Vendor’s Name / Stamp / Signature

ht cable fault locator- van mounted · and xlpe ht underground power cables of the ratings 11, 22...

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