capacitor voltage transformers -...

Capacitor Voltage Transformers

MWB

MWB SHANGHAI CO.,LTD.

TRENCH CHINA

Capacitor Voltage Transformer

Trench

Trench

69kV-800kV

( )

CVT

CVT

(

)

CVT

Introduction

Trench is a recognized world leader in the design and

manu-facture of high voltage equipment for application

on electric utility and high-energy industrial systems. As

part of Trench s product scope,the Company produces

a diversified range of Instrument Transformers that are

installed on 69-800kV electrical systems. Instrument

Transformers include: Voltage(potential)Transformers

(both inductive and capacitive type), Current Transform-

ers and Combined Instrument Transformers (voltage

and current transformer in one unit).

Capacitor Voltage Transformers must convert

transsmission class voltages to standardized low and

easily measurable values, which will be used for

metering,protection and control of the high voltage

system. As such, the need for accurate and reliable

voltage transformation is essential. Additionally,

Capacitor Voltage Transrormers serve as a coupling

capacitor for coupling high frequency power line carrier

signals to the transmision line.

This brochure will detail the features and characteristics

Capacitor Voltage Transformers.

1

Meet all IEC,GB and ANSI metering and protection classes (other standards on request)

Applications from 69kV-800kV

Quality Assurance in accordance with ISO9001

Capable of carrier coupling PLC signals to the network

Optimized insulation system design utilizing state-of-the-art processing techniques with either

mineral oil or synthetic insulating fluids

Stability of capacitance and accuracy over a long period of time due to superior

clamping system design

Oil expansion by way of hermetically sealed stainless steel bellows assures the integrity of the

insulation system over time

Bellows puncture pin provides for release of internal pressure in the event of severe service

conditions leading to internal discharges

Extra high strength porcelains provide both superior seismic performance and the ability to

mount large line traps directly on the CVT with corresponding savings in installed cost

Maintenance-free oil filled cast alunminum base box

Superior transient response characteristics

Internal company routine test and quality requirements exceed those of international standards

Not subject to ferroresonance oscillations with the network or breaker capacitor

2

Features

IEC GB ANSI

69kV 800kV

ISO9001

PLC

CVT

Construction

Trench CVT consists of two primary assemblies: the high voltage

capacitor sections and the base box housing the electromag-

netic components.

Series connected capacitor elements, housed in porcelain

shells, each hermetically sealed, are referred to as capacitor

sections. The capacitor elements are insulated with a high

tor sections (1-4 capacitor sections per CVT) that most of the high voltage will be dropped.

with dried mineral oil, protecting the components for environmental deterioration.

Winding. The ferroresonance suppression cirouit does not adversely affect transient respons.

3

quality polypropylene film/paper dielectric and impregnated with highly processed synthetic fluid.

Each capacitor section is equipped with a stainless steel expansion chamber which will allow the

synthetic fluid to expand and contract with changes in ambient operation temperatures. Should there

be excessive pressure build up within a capacitor section, the expansion chamber will engage a

puncture pin, resulting in pressure release and visual indication of a problem. It is over these capaci-

A tap voltage (approximately 5-12 kV depending on type) is taken from the lowest capacitor section

and fed to an electromagnetic circuit in the cast aluminum base box.The base box contains the

intermediate transformer which will provide the final output voltage via multiple tapped secondary

windings, series compensation reactor and ferroresonance control circuitry. The base box is filled

Ferroresonance is simply and effectively controlled by utilization of low flux density designed mag-

netic circuitry and a saturable reactor controlled damping circuit connected across the secondary

4

3 CVT

1

2

3

4

5

6

7

8

9

NOTE: connection between internal terminals

are made at the factory as required for each unit.

Fig.3 Typical schematic diagram of a Capacitor

Voltage Transformer

1 Series reactor

2 Intermediate voltage transformer

3 Harmonic suppression filter

4 Protective gap

5 Secondary terminal board

6 Faraday shield

7 Potential ground switch

8 Choke coil and gap assembly

9 Drain coil, gap and carrier ground switch

assembly

4 CVT

1.

2.

3.

4.

5.

6.

7.

8.

9.

Fig.4 Sectioned view of a typical Capaci-

tor Voltage Transformer

1 Porcelain Shell

2 Oil Filled Expansion Chamber

3 Capacitor Rolls

4 Oil Filled Base Box

5 Intermediate Transformer

6 Series Reactor

7 Stabilizing Burden

8 Low Voltage Terminal Box

9 Oil Level Side Glass

8 7

6

5

4

9

31

2

1

2

3

C1

C2

TO H.V. POWER CIRCUIT

H O

N

P1

L0

L1

L2

L3

L4

L5

L6

L7

L8

1

7

8

2

T

A

B

CD

E

F

GK

M

6 3 5

X1

X2

X3

Y1

Y2

Y3

P1

P2

CAR.

4

9

69kV(1)

69kV CAPACITOR VOLTAGE TRANSFORMER TECHNICAL SPECIFICATION

System Voltage

Max System Voltage

(50Hz)

Withstand Voltage(50Hz)

BIL

SIL

Product Type

Capacitance

Creepage Distance

Flashover Distance

Porcelain Color

VA

Main Winding

Total Burden

Residual Winding

Thermal rating

130km/h (N)

Max,Horzontal Terminal Pull in 130km/h Wind

Total Height

Weight

h1(mm)

(kg)

(KV)

(KV)

(KV)

(KV)

(KV)

(pF)

(mm)

(mm)

0.2

0.5

1/3P

3P

(VA)

69

72.5

140

325

15570

1403

341

(1)

Two main windings are supplied as standard, with a third auxiliary winding available as

an optional extra.

(2)

The accuracy class for total simultaneous loading is equal to the values for each main

winding.

( )

Other ratings available on request (Also for other voltage level)

1)

5

BROWN

TEMP-69SU

10000 20000

1815

580

100 225

250 500

500 700

100 100

10001000

TEMP-69SU

110kV


System Voltage

Max,System Voltage

(50Hz)


BIL

SIL

Product Type

Capacitance

Creepage Distance

Flashover Distance

Porcelain Color

VA

Main Winding

Total Burden

Residual Winding

Thermal rating

130km/h (N)


h1(mm)

Total Height

(kg)Weight

(KV)

(KV)

(KV)

(KV)

(KV)

(pF)

(mm)

(mm)

0.2

0.5

1/3P

3P

(VA)

110

126

230

550

7000,8000,10000

3150

930

BROWN

200

500

700

100

1000

11340

1759

295

TEMP-110IU

20000

3150

940

300

600

1000

100

1500

21130

1822

442

(1)


an optional extra.

(2)


winding.

6

TEMP-110SU

15000

3150

980

250

500

700

100

1000

9680

1813

306

TEMP-110HU

40000

3150

940

350

700

1000

100

1500

21300

1810

499

TEMP-110SU

138kV


System Voltage

Max,System Voltage

(50Hz)


BIL

SIL

Product Type

Capacitance

Creepage Distance

Flashover Distance

Porcelain Color

VA

Main Winding

Total Burden

Residual Winding

Thermal rating

130km/h (N)


h1(mm)

Total Height

(kg)Weight

(KV)

(KV)

(KV)

(KV)

(KV)

(pF)

(mm)

(mm)

0.2

0.5

1/3P

3P

(VA)

138

145

275

650

TEMP-138SU TEMP-138SU

10000

3680

1370

BROWN

100

8450

2191

329

(1)


an optional extra.

(2)


winding.

5000

100 200

250 500

500 700

100

1000 1000

7

220kV


System Voltage

Max,System Voltage

(50Hz)


BIL

SIL

Product Type

Capacitance

Creepage Distance

Flashover Distance

Porcelain Color

VA

Main Winding

Total Burden

Residual Winding

Thermal rating

130km/h (N)


h1(mm)

Total Height

(kg)Weight

(KV)

(KV)

(KV)

(KV)

(KV)

(pF)

(mm)

(mm)

0.2

0.5

1/3P

3P

(VA)

220

252

460

1050

6300

BROWN

(1)


an optional extra.

(2)


winding.

8

TEMP-220IU

10000

6300

300

600

1000

100

1500

12230

3089

612

1880

TEMP-220SU

7500

1960

250

500

700

100

1000

12230

3060

408

TEMP-220HU

20000

6300

1880

350

700

1000

100

1500

12230

3092

748

2953

397

3500,4000,5000

1860

200

500

700

100

1000

5780

TEMP-220SU

330kV


System Voltage

Max,System Voltage

(50Hz)


BIL

SIL

Product Type

Capacitance

Creepage Distance

Flashover Distance

Porcelain Color

VA

Main Winding

Total Burden

Residual Winding

Thermal rating

130km/h (N)


h1(mm)

Total Height

(kg)Weight

(KV)

(KV)

(KV)

(KV)

(KV)

(pF)

(mm)

(mm)

0.2

0.5

1/3P

3P

(VA)

330

363

510

1175

(1)


an optional extra.

(2)


winding.

TEMP-330SU

4000

2610

250

500

700

100

1000

4110

3816

454

9075

9

TEMP-330IU

7500

9075

BROWN

300

600

1000

100

1500

8450

3773

725

2690

TEMP-330HU

15000

9075

350

700

1000

100

1500

9340

3950

896

2740

550kV


System Voltage

Max,System Voltage

(50Hz)


BIL

SIL

Product Type

Capacitance

Creepage Distance

Flashover Distance

Porcelain Color

VA

Main Winding

Total Burden

Residual Winding

Thermal rating

130km/h (N)


h1(mm)

Total Height

(kg)Weight

(KV)

(KV)

(KV)

(KV)

(KV)

(pF)

(mm)

(mm)

0.2

0.5

1/3P

3P

(VA)

500

550

740

1675

1300

BROWN

(1)


an optional extra.

(2)


winding.

TEMP-550HU

10000

13750

350

700

1000

100

1500

6120

5664

1225

4110

5000

600

100

1500

5330

5533

940

13750

4030

10

TEMP-500IU

300

1000

Capacitor Voltage Transformers

MWB

MWB SHANGHAI CO.,LTD.

TRENCH CHINA

Trench Austria GmbHLinz-LeondingAustria

Trench Brasil LTDAMinasGeraisBrasil

Trench LimitedCoil Product DivisionOntario Canada

Trench LimitedInstrument Transformer DivisionOntario Canada

Trench France S.A.St-Louis CedexFrance

Trench Germany GmbHBambergGermany

Trench Switzerland AGBaselSwitzerland

Trench(UK)LinmitedHebburn

( )

MWB

:

3658

: +86-21-54720088( )

+86-21-54726918( )

: +86-21-54723118

: [email protected]

: 200245

Trench ChinaMWB (Shanghai) Co.,Ltd.No.3658 Jiangcheng Rd.Minhang Economic andTecnnological DevelopmentZone Shanghai P.R.ChinaTel: +86-21-54720088

Fax: +86-21-54723118E-mail: [email protected]: 200245

www.trenchgroup.com

+86-21-54726918

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