Gas-insulated Instrument Transformers for outdoor Installation

2Gas-insulated Instrument Transformers for outdoor Installation

Trench Germany the former MWB, founded in1946 is a recognized word-wide leader in thedesign and manufacture of high voltage equipmentfor electrical and industrial systems.

In its long history while utilizing severalinsulation mediums, e. g. epoxy resin, traditionaloil-paper-insulation the company decided tofocus on SF6-gas as an insulation medium for itscomplete production range.

Due to the good experience with SF6-gas as aninsulation medium Trench Germany being thefirst supplier of SF6-voltage transformers for GISin 1965 it was decided in 1985 to abandoncompletely the conventional oil-paper insulatedinstrument transformer product line for outdoorinstallations.

Since this milestone conventional instrument trans-formers with SF6-insulation manufactured by thecompany have found world-wide recognition.

Today Trench is a market leader with more than 10,000 units in service under different environ-mental conditions.

Our full range of instrument transformers covering

voltage (potential) current combined

units is available for system voltages from 72.5 kV up to 800 kV.

800 kV Voltage Transformer

3 explosion-proof design by thecompressible insulation mediumSF6-gas and rupture disc

no ageing of the insulation systemand minimum risk of failure

insulation medium SF6:non-toxic / inert / non-flammable

gas monitoring by a densimeter

guaranteed SF6-leakage rate ofless than 1% per year

transformer operates at ratedvoltage, even in the case of lossof SF6-pressure

resource-saving due to ecologi-cally beneficial insulation systemand ideal recycling features

optimum field grading is accom-plished by a fine condensergrading system especially devel-oped for this application

meets all IEC and ANSI meteringand protection classes (otherstandards on request)

Features

Hollow Composite Insulator

800 kV Current Transformer

shedded with a high quality sili-cone, therefore long lasting hydrophobicity transfer to pollu-tion layers

significant reduction of leakagecurrents as well as surface dis-charges

cleaning not necessary

seamless sheds based on ourunique single mould method forassembling the silicone sheds

variable shed distances withoutadditional tool cost

earthquake resistant

resistant against vandalism

easy handling during transporta-tion and installation

20 years experience in greatlydifferent climatic zones

Voltage TransformersType SVS

4

head type design

available for the full voltagerange 72.5 kV up to 800 kV andfull current range 100 A up to4800 A

low reactance bar type primaryproviding optimal short-circuitperformance

multiple-turn primaries for smallprimary currents

uniformly distributed secondarywindings guarantee accuratetransformation at both rated andhigh currents

stable accuracy over a long period of time

perfect transient performance

maintenance free due to use ofcorrosion-resistant materials only

core changes after assembly donot require the destruction ofthe high voltage insulation

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available for the full voltagerange 72.5 kV up to 800 kV

wide range ferroresonance freedesign without the use of an external damping device (pleaseask for details)

essentially unaffected by externalstray magnetic fields

stable accuracy over a long periodof time

suitable for line-discharging

optimized high voltage coil assuresidentical electric stresses underboth transient and steady stateconditions

maintenance free due to use ofcorrosion-resistant materials only

Rupture Disc

Primary Conductor

Secondary Housing

CT Cores

Head Housing

Flange

Outlet Tube

Composite Insulator

Terminal Box

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CurrentTransformersType SAS

5Rupture Disc

Flange

Outlet Tube

Capacitive Grading

Composite Insulator

Spacer

HV-Winding

Magnetic Core

Core Housing

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Rupture Disc

HV Winding

Magnetic Core

Spacer

Primary Conductor

CT Cores

Head Housing

Flange

Outlet Tube

Composite Insulator

Terminal Box

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low weight and compact SF6-design

the single-section high voltagecoil (not cascaded) of the voltagetransformer section enables aproduct range for combined instrument transformers up to800 kV

head type design with voltagetransformer section located ontop of the current transformer

wide range ferroresonance freedesign without the use of an external damping device (pleaseask for details)

low reactance type primary conductor allows for high short-circuit currents and covers allcore standards

less foundation space requiredcompared to the use of individualcurrent transformers and voltagetransformers

suitable for line-discharging

essentially unaffected by externalstray magnetic fields

maintenance free due to use ofcorrosion-resistant materials only

CombinedTransformersType SVAS

6Gas-insulated Current Transformers

Electrical and Mechanical Data

Voltage Max. Test voltage Impulse Switching Min. Standardrange system 50/60 Hz, withstand impulse flashover creepage

voltage 1 min 1.2/50 s test withstand distance distancedry/wet

kV kV kV kV kV mm mm

123 123 230 550 1216 2880123 123 230 550 1216 2880123 123 230 550 1216 2880145 145 275 650 1396 3300145 145 275 650 1396 3300145 145 275 650 1396 3300170 170 325 750 1636 3780245 245 460 1050 2350 6135245 245 460 1050 2350 6135300 300 460 1050 2350 6135300 300 460 1050 2350 6135362 362 575 1300 1050/1175 3728 10155420 420 630/680 1425/1550 1050/1175 3728 10155550 550 680 1550 1175 3728 10155550 550 800 1800 1300 4020 11755800 800 920 2050 1425/1550 6000 14112

7Current Transformer123 kV

Dh2 h1

Net weight(approx.) Dimensions

h1 h2 D

kg mm mm mm

350 2660 1950 450645 2760 2035 450260 2480 1865 450360 2840 2130 450655 2940 2215 450270 2660 2045 450720 3180 2455 450880 4110 3350 6001250 4280 3450 600880 4110 3350 6001250 4280 3450 6001550 5780 4940 9001550 5780 4940 9001550 5780 4940 9002580 6670 5790 11004000 9605 8650 1100

8Gas-insulated Voltage Transformers

Electrical and Mechanical Data

Voltage Max. Test voltage Impulse Switching Min. Standardrange system 50/60 Hz withstand impulse test flashover creepage

voltage 1 min 1.2/50 s withstand distance distancedry/wet

kV kV kV kV kV mm mm

123 123 230 550 1216 2880145 145 275 650 1396 3300170 170 325 750 1636 3780245 245 460 1050 2350 6135300 300 460 1050 850 2350 6135362 362 575 1300 1050/1175 3728 10155420 420 630/680 1425/1550 1050/1175 3728 10155550 550 680 1550 1175 3728 10155550 550 800 1800 1300 4020 11755800 800 920 2050 1425/1550 6000 14112

9Net weight(approx.) Dimensions

h1 h2 D

kg mm mm mm

330 2150 2075 450340 2330 2255 450420 2910 2815 450790 3685 3565 600790 3685 3565 6001600 5440 5350 9001600 5440 5320 9001600 5440 5320 9002150 5940 5820 9003570 9400 9325 1250

Voltage Transformer123 kV

D

h2 h1

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Gas-insulated Combined Current and Voltage Transformers

Electrical and Mechanical Data

Voltage Max. Test voltage Impulse Switching Min. Standardrange system 50/60 Hz withstand impulse test flashover creepage

voltage 1 min 1.2/50 s withstand distance distancedry/wet

kV kV kV kV kV mm mm

123 123 230 550 1216 2880123 123 230 550 1216 2880123 123 230 550 1216 2880145 145 275 650 1396 3300145 145 275 650 1396 3300145 145 275 650 1396 3300170 170 325 750 1636 3780245 245 460 1050 2350 6135245 245 460 1050 2350 6135300 300 460 1050 2350 6135300 300 460 1050 2350 6135362 362 575 1300 1050/1175 3728 10155420 420 630/680 1425/1550 1050/1175 3728 10155

11

Net weight(approx.) Dimensions

h1 h2 D

kg mm mm mm

430 3275 1950 450820 3370 2035 450420 3070 1865 450440 3455 2130 450830 3550 2215 450430 3250 2045 450840 3840 2520 5001500 4950 3350 6001870 5150 3450 6001500 4950 3350 6001870 5150 3450 6002500 6900 4940 6002500 6900 4940 600

Combined Current andVoltage Transformer

123 kV

Dh2

h1

Subject to change without notice04.2000

E 216.11

www.trenchgroup.com

Trench Austria GmbHPaschinger Strasse 49, Postfach 13A-4060 Linz-Leonding/AustriaPhone +43.732.6793-0Fax +43.732.671341E-Mail sales@TrenchAustria.at

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Trench LimitedCoil Product Division71 Maybrook Drive, ScarboroughOntario, Canada M1V 4B6Phone (416) 298-8108Fax (416) 298-2209E-Mail sales@ca.trenchgroup.com

Trench LimitedInstrument Transformer Division390 Midwest Road, ScarboroughOntario, Canada M1P 3B5Phone (416) 751-8570Fax (416) 751-6952E-Mail sales@ca.trenchgroup.com

Trench France S.A.16, rue du Gnral CassagnouB.P. 70F- 68302 St-Louis Cedex/FrancePhone +33.3.89 70 23 23Fax +33.3.89 67 26 63E-Mail sales@trench-france.com

Trench Germany GmbHNrnberger Strasse 19996050 Bamberg/GermanyPhone +49.951.1803-0Fax +49.951.1803-224E-Mail sales@trench.de

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