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AC test transformer

AC test transformer

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.StructureMax voltage
    YDTWSingle unitupto 750kV
    YDTCWCascadedupto 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.

    TypeStructureMax voltage
    YDWSingle unitupto 750kV
    YDCWCascadedupto 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.

    TypeStructureMax voltageMax capacity
    YDQWSingle unitupto 1200kVupto 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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