The AC test transformer are especially designed for testing high voltage products and components, such as cables, power transformers, gas-insulated switchgears, bushings and arresters. It is also suitable to test insulation materials. They are used to generate testing high voltage and function as part of the complete system. These systems are particularly suited for tests requiring stable voltage even if the load changes under voltage (corona, wet & pollution tests) or when the load is inductive (inductive voltage transformers).
The AC test transformer can be either in insulation cylinder type with metallic cover and base or metal tank. The insulation cylinder modular test transformers can be stacked to connect in series or parallel to get larger voltage or current to extend its application range.
Insulating sheath transformers is installed in an insulating sheath and is oil-cooled. Individual transformers can be connected in parallel or series to increase the current or the voltage. The possibility of stacking several of these transformer modules allows reaching very high voltage levels by keeping reasonable floor space.
| Model No. | Structure | Max voltage |
| YDTW | Single unit | upto 750kV |
| YDTCW | Cascaded | upto 2250kV |
Metal tank transformers is situated in an enclosed and earthed metal tank. This transformer is oil-cooled and can be optionally equipped with a suitable bushing (oil-to-air or oil-to-SF6) 。This design is allowing continuous operation and high currents (high power) which qualified for continuous duty, long duration tests.
| Type | Structure | Max voltage |
| YDW | Single unit | upto 750kV |
| YDCW | Cascaded | upto 2250kV |
AC test system with Gas-insulated transformer
The SF6 insulated test transformer is designed as a Gas-insulated model which convenient for testing GIS/GIL components and switchgears. This makes testing of such installations possible without feeding them through an air-SF6 bushing.
| Type | Structure | Max voltage | Max capacity |
| YDQW | Single unit | upto 1200kV | upto 4800kVA |
Main components:
switchgear cabinet
Voltage regulator
Test transformer
Damping resistance
voltage divider
Control and Measuring System (manual operation or computer-aided automatic systems)
Additional features and accessories:
Power noise filter
Isolation transformer
Harmonic filters to improve wave shape
Coupling capacitor
fixed or tunable compensation of capacitive testing power
Fast over-voltage protection device
Partial discharge (PD) measuring system including blocking impedance
Compressed gas capacitor
Capacitance and dissipation factor measuring instrument
Moveable design
Made solution upon customer's request
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