Transformers & Reactors

In order to check and verify that system and component meet the specified requirements, all kinds of HV transformers and reactors need be tested in many items. As per IEC standard, there are routine tests, type tests and special tests.

We offer AC and impulse dielectric test system for insulation purpose, also turnkey service is available including all instruments and installation.


Module type AC Test Transformer Systems
(for Transformer Applied Voltage Test)

Module type AC Test Transformer Systems

YDTW series AC test transformers are of module type and oil insulated, inner insulating materials are transformer oil, shells are insulating cylinders, which are made of epoxy resin.

TThe high voltage can directly feed to test object without bushing, and modules are allowed to stack in cascade to reach very high voltage levels by keeping reasonable floor space.

Rated voltage of single module can be up to 750kV, the highest voltage can reach 2250kV by stacking three of these transformer modules.

PDF Brochure: PDFModule type AC Test Transformer Systems


AC Resonant Test Systems with Variable Inductance
(for Transformer Applied Voltage Test)
AC Resonant Test System with Variable Inductance

IRST series variable inductance resonant test systems are designed to compensate capacitance in testing circuit precisely by adjusting inductance of HV reactors, when test system gets in resonance, it outputs continuous AC voltage of power frequency (mainly 50 or 60Hz, matches feed-in mains).

IRST series HV reactors, main part of the system, work on fixed frequency and variable inductance, are of oil insulation and epoxy glass-fiber insulating shell, module type and stackable, voltage up to 2000kV.

These systems offer significant advantages to standard AC test systems where the load is largely capacitive.

PDF Brochure: PDFVariable Inductance Resonant Test Systems


Impulse Voltage Generator for Transformer Impulse Test
Impulse Voltage Test systems

FIVG series impulse voltage test systems are mainly used to generate standard lightning impulse (LI), full or chopped waves, switching impulse (SI) wave, impulse voltage ranges from 10kV to 7200kV (LI 7200kV, SI 5000kV), energy from 2.5kJ to 720kJ. Also it can be used to carry out steeping and oscillating impulse test by adding some extra equipment.

We offer various kinds of structure design for impulse voltage generator, inclusive of L type, G type, H type, V type and etc.

Stage voltage: 100kV, 150kV, 200kV, 300kV
Stage energy: 5kJ, 10kJ, 15kJ, 20kJ, 30kJ
LI: 1.2±30%μs/50±20%μs, efficient ≥90%
SI: 250±20%μs/2500±60%μs, efficient ≥80%
CI: 2~6μs, efficient ≥85%

PDF Brochure: PDFImpulse Voltage Test systems


Supporting transformers
Supporting transformers

YDW series supporting transformer.

High voltage supporting transformer is special designed for high capacitance or ultra high capacitance power transformer testing.

The taps can be customized.
The voltage can be customized

The image is the 3000kVA supporting transformer for AREVA.


Intermediate transformers
Intermediate transformers

High voltage intermediate transformer is special designed for the testing of high capacitance or ultra high capacitance power transformer.

The system can be act as power transformer testing source.

For power transformer testing, normally power frequency AC test transformer, medium frequency motor generator and high capacitance intermediate transformer will be equipped to act as power source.

The voltage and capacity can be customized.