Instrument Transformers for
Gas-insulated Switchgear
Instrument Transformers for
Gas-insulated Switchgear
Trench Germany – the former MWB,
founded in 1946 - is a recognized
world-wide leader in the design
and manufacture of high voltage
equipment for electrical and industrial systems.
While the first GIS-installations
were put into service in 1965,
Trench Germany was a pioneer for
the delivery of the first SF6-gasinsulated voltage transformers for
this application.
In its long history - while experimenting with several insulation
mediums, e. g. epoxy resin, traditional oil-paper-insulation - Trench
Germany decided to focus on SF6gas as an insulation medium for its
complete production range.
The continuous product development and the close co-operation
with almost all GIS-manufacturers
world-wide made Trench Germany
the technological leader in this field.
Trench Germany manufactures a
complete range of current and
voltage transformers, both singlephase (type SU/SA) and threephase (type SUD/SAD) for applications from 72.5 kV up to 800 kV.
Technical Data (Voltage Transformers)
Type
SU/SUD 72.5...145
Um kV
72.5
123
145
170
245
245
300
362
362
420
420
525
765
800
Up kV
140
230
275
325
395
460
460
510
510
570
630
680
880
970
BIL kV
325
550
650
750
900
1050
1050
1050
1175
1300
1425 1550
2100
2100
SIL kV
—
—
—
—
—
—
850
850
950
1050
1050 1175
1550
1550
Rated voltage
factor/time
1.9 / 8h
SU/SUD * 170...300
SU 362...525
1.9 / 30s or 1.5 / 30s
1.9 / 30s or 1.5 / 30s
SU 765/800
1.5 / 30s
Min. withstand
voltage at pressure
1.2 x UN
reduction to 1bar (abs.)
approx. diameter mm
400 to 950
690 to 1200
950
1400
approx. weight kg
160 to 1000
370 to 1700
1000
1900
* up to voltage level </=170 kV
Technical Data (Current Transformers)
2
Type
SA/SAD 72.5–245, SA 362–800
Current values
50 – 5000 A, as per customers’ specification
Features
• in addition to the measurement
of the voltages and currents,
best discharge capabilities for
HV-lines (see Table 1)
• custom-designed instrument
transformers for each specific
application and extended function; designs comply with dimensional restrictions, flange sizes
and
insulator requirements
ferroresonance suppression
• shielded against transient
overvoltages in accordance with
IEC standards. Special additional
shielding is available.
• guaranteed SF6-leakage rate of
less than 1% per year
• equipped with pressure relief
disc and deflection device
• standard designs for single- and
three-phase units
• all components designed and
tested for mechanical stress to
withstand up to at least 20 g
• meets most national and international standards with regard
to pressure vessel codes
(e.g.: ASME, SVTI, Lloyd's, ISPESL)
• accuracy classes in accordance to
DIN VDE 0414, IEC 60044, ANSI:
IEEE C57.13, AS 1243 (other
standards or classes on request)
• prevention of occurrence of stable
ferroresonances by integrated
• shock indicators warn against
inadmissible acceleration during
Table 1
Discharge capability of SF6-insulated
voltage transformers type SU /SUD;
two successive discharges
(switch cycle 0-C-0) with following
cooling down time > 5 h.
Further values on request.
Voltage
transformer
Type
SU
SUD
Um
Cmax
kV
72.5
123
145
170
245
300
362
420
525
800
123
145
µF
20
20
20
15
12
10
8
5
4
3
20*)
20*)
*) per phase
Three-phase Voltage Transformer
Type SUD 145
During Manufacturing Process
Complete Unit
3
Trench Facilities
The Trench Group is your
partner of choice for electrical
power transmission and
distribution solutions today;
and for the development of
your new technology solutions
of tomorrow.
Trench® Austria GmbH
Paschinger Strasse 49
Postfach 13
A-4060 Linz-Leonding
Austria
Phone: 43-732-6793-0
Fax: 43-732-671341
Trench® Limited
Instrument Transformer Division
390 Midwest Road
Scarborough, Ontario
Canada M1P 3B5
Phone: 416-751-8570
Fax: 416-751-6952
Trench® Brasil Ltda
Via Expressa de Contagem, 2685
Contagem, Minas Gerais
CEP 32370-485
Brazil
Phone: 55-31-3391-5959
Fax: 55-31-3391-1828
Trench® Limited
Power Line Carrier Division
815 Middlefield Road, Unit 6A
Scarborough, Ontario
Canada M1V 2P9
Phone: 416-291-8544
Fax: 416-291-5581
Trench® China
MWB (Shanghai) Co., Ltd.
No. 3658, Jiancheng Road
Minhang, Shanghai
Peoples Republic of China
200245
Phone: 86-21-54720088
Fax: 86-21-54723118
Trench® France S.A.
16, Rue du Général Cassagnou
B.P. 70 F-68 302
St. Louis, Cedex
France
Phone: 33-3 89-70-2323
Fax: 33-3 89-67-2663
Trench® High Voltage
Products Ltd., Shenyang
No. 2 Zhengliang Er. Road
Jing Shen Xi San Street
Dao Yi Economic Development Zone
Shenyang 110136 P.R. China
Phone: 86-24-89722688
Fax: 86-24-89737200
Trench® Limited
Bushing Division
432 Monarch Avenue
Ajax, Ontario
Canada L1S 2G7
Phone: 905-426-2665
Fax: 905-426-2671
Trench® Limited
Coil Product Division
71 Maybrook Drive
Scarborough, Ontario
Canada M1V 4B6
Phone: 416-298-8108
Fax: 416-298-2209
Trench® Germany GmbH
Nürnberger Strasse 199
D-96050 Bamberg
Germany
Phone: 49-951-1803-0
Fax: 49-951-1803-224
Trench® Switzerland AG
Lehenmattstrasse 353
CH-4028
Basel
Switzerland
Phone: 41-61-315-51-11
Fax: 41-61-315-59-00
Trench® (UK) Limited
South Drive
Hebburn
Tyne & Wear
NE 31 1 UW
Phone: 44-191-483-4711
Fax: 44-191-430-0633
www.trenchgroup.com
E 216.21
Subject to change without notice (05.2006)
Printed in Canada.