High Voltage AC Test Equipment

The test transformers are installed in an insulating cylinder shell and are oil-cooled, they are well suited for single operation and operation in series connection (cascading), so called modular type, designed for testing all types of electrical insulations up to 2400kV.

Using resonance between capacitive test object and inductive HV reactor of the test system to generate a continuous sinusoidal high voltage in 50/60Hz, resonant system is lighter and more economic than AC test transformer systems because only the lossed in test circuit must be coverd by power supply. Cylinder modular reactor enables connection in series or in parallel for extending the range of voltage and current.

This system operates in a frequency range from 20Hz to 300Hz, and the HV reactor features a modular design, several reactors can be connected in series or parallel to achieve higher test voltages or power. The test system can be transported in a container without taking up much space, or it can be set up on a trailer.

They are fully metal-clad encapsulated, can be connected to GIS directly by flange, also can output HV AC voltage by bushings.

The test transformers are situated in an enclosed and earthed metal tank, oil-cooled and can be optionally equipped with a suitable bushing (oil-to-air or oil-to-SF6), can be set up close to the wall or objects within the test field, better for continuous duty and long duration tests.

Metal tank type HV reactor with variable inductance, mainly used for testing on big capacitance load, like routine test of HV cables, capacitors, generators and motors.

These metal tank rectors are realised in conventional tank-type design with oil-paper insulation and nature oil cooling, especially designed for on-site testing including frequent transportation and outdoor operation.

Heat cycle high current test systems are mainly designed for testing the thermal stability of MV HV cables, generator stators, switching cells, etc.