OIL INSULATED

VOLTAGE
TRANSFORMERS
Trench is a recognized world leader in the design and manufacture
of high voltage equipment for application on electric utility and high
energy industrial systems.
Oil insulated Voltage Transformers are used to convert high transmission
line voltages (up to 550KV) 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.
The reliability and security of Trench oil-insulated instrument transfor-
mers is based on over 50 years of innovation with oil-insulated units
operating under a wide range of environmental conditions.
Oil insulated Voltage Transformers also ensure suitable electrical
insulation between high voltage and low voltage measuring equipment.
MAIN
FEATURES

General Product design Product process

Complete portfolio available from 72 to 550 kV Oil/paper internal insulation Optimized design to manufacturing

Meet all IEC and ANSI metering and protection External insulation with porcelain or composite insulator Lean manufacturing concept applied to the
classes whole supply chain
External part made of aluminum or stainless materials
Rated primary Voltage up to 550 kV Optimized design allows the use of reduced
Sealed & Robust Construction numbers of components and quick Customization
Rated Secondary Voltages 100 V, 100:√3 V, 100:3 to all Customer specific requirements
V, 110 V, 110:√3 V, 110:3 V, … Easy Customization to match all specific Customer
requirements Partial discharge free design and process
Suitable also for Line Discharge use
Easy Installation without special tools required . Maintenance free during a long lifetime of more
Fully type tested according to international than 30 years
standards Available to withstand :
- Effects of internal arc (according to IEC 61869 Trench Management System has been certified
Special tests are also available to meet Standard) to ISO 9001, ISO 14001 and OHSAS 18001 standards
specific customer requirements - Multichopped Test (according to IEC 61869 Standard)
- Heavy seismic solicitations, according to IEC 62271,
IEEE 693 and specific customers’ requests
(i.e. Chile ETG A.0.20)

Hermetically sealed. A suitable Nitrogen cushion or Inox

steel bellows allows the oil volume variation in every
service conditions.

Thousands of transformers installed and in service for more than 50 years all over the world and in all environmental conditions are the best guarantee of the quality
and reliability of our products.
 B

PRODUCT

VEOS
STRUCTURE

VEOT

Primary Terminal

Expansion Bellows
C
A
VMTA

Porcelain/Composite
Insulator
A

B Bushing

Secondary Terminal Box

High And Low Voltage

A

Windings

Grounding Terminal

E E E
D D D
 ELECTRICAL and
MECHANICAL DATA

E - Base Fixing (N°4 holes

Mínimum nominal specific

Mínimum nominal specific

Impulse withstand Voltage

Ø 20 for VMTA, n°4 holes

Rated Power-Frequency

Ø 24 for VEOT, n°4 holes

Highest Voltage for

creepage distance

creepage distance
withstand Voltage

withstand voltage

(Pollution Level III)

(Pollution Level IV)

Rated Switching
Rated Lightning
Equipment Um

Ø 30 for VEOS)
Arc Distance

Total weight

Oil Weight
Type

D
B

C
A

kV kV kV kV mm mm mm mm mm mm mm mm KG KG
(rms) (rms) (peak) (peak)

VMTA 72,5 72,5 140 325 - 700 1815 2250 1125 560 - 756 X 756 690 X 690 340 55

VEOT 123 123 230 550 - 1200 3075 3813 2265 698 - 535 X 528 450 X 450 380 60

VEOT 145 145 275 650 - 1200 3625 4495 2340 698 - 535 X 528 450 X 450 380 60

VEOT 170 170 325 750 - 1400 4250 5270 2465 415 - 535 X 528 450 X 450 400 130

VEOT 245 245 395 950 - 220 6125 7595 3585 455 - 700 X 680 600 X 600 750 130

VEOT 300 300 460 1050 850 220 7500 9300 3740 465 - 700 X 680 600 X 600 800 130

VEOS 362 362 510 1300 950 2650 9050 11222 4955 690 4750 700 X 680 600 X 600 1020 220

VEOS 420 420 630 1425 1050 3200 10500 13020 5795 690 5280 700 X 680 600 X 600 1200 240

VEOS 550 550 680 1550 1175 3800 13750 17050 6445 690 5945 700 X 680 600 X 600 1450 265

Data are indicative and are not binding. Dimensions are referred to typical VTs equipped with porcelain insulator & according to IEC 61869 Standards – Other options are available.
The regular improving on design may cause discrepancies between this document and updated product.
On request our sales team will be glad to submit You a firm updated technical & commercial offer fully customized to your specific requests.
 CA-00003-2018-06-EN
Trench Canada
1865 Clements Road
L1W 3R8 Pickering,
Ontario CANADA
t. +1 416 298 8108
f. +1 416 298 2209

Trench Germany
Nürnberger Straße 199
96050 Bamberg
Germany
t. +49 951 1803 0
f. +49 951 1803 224

Trench Italia
Strada Curagnata, 37
17014 Cairo Montenotte
Italy
t. +39 019 5161 111
f. + 39 019 5161 401

Trench High Voltage Shenyang

No. 2 Jingshenxisan Street
Daiyi Economic
Development Zone
Shenbei New District, Shenyang 110136
People’s Republic of China
t. 86-24-8 89 23 99
f. 86-24-89 73 72 00

www.trenchgroup.com