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AC resonant test system

AC resonant test system

Testing of certain apparatus requires much high voltage or current that a straight AC test system is not sufficient. Thus resonant test reactor with a variable core is needed. The main advantage of such test systems is lower input power and larger output power. The resonant test system is designed to compensate capacitance in the testing circuit precisely by tuning inductance of the test system. The natural resonance frequency of the test system matches feed-in mains, usually 50/60Hz. When the test system gets in resonance, it generates continuous testing high voltage.

AC resonant test system is used for factory testing of middle, high and ultra-high voltage cables, capacitors, generators, motors, power transformers and gas-insulated switchgears.

The resonant test systems can be either in insulation cylinder type or metal tank. Insulation cylinder reactors are in module and can be stacked to connect in series parallel to get much higher voltage or current. Additional voltage taps are possible for metal tank reactors. The output voltage is fed out through the tap-changers by HV bushings. This kind of reactors extend application range, and satisfy testing for cables of various voltage class.

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  • Metal tank type HV Reactor is oil-cooled which is installed in a tank made of steel. The high voltage is fed outward through the steel tank via a HV bushing. The reactor can be fitted with additional voltage taps (bushings) to achieve largest testable capacitances of test objects at lower test voltages.

    Model No.StructureMax voltageMax current
    XZLSingle unitupto 400kV35A

    Application

    • For routine testing of medium and high voltage cables up to 400 kV in accordance with IEC 60502 und IEC 60840

    • For routine testing of high voltage capacitors up to 60 kV in accordance with IEC 60871

    • For routine and inspection testing of generators and motors up to 60 kV in accordance with IEC 60034

    Cylinder type HV Reactor is oil-cooled which is installed in a closed container made of steel and insulating cylinders. The module setup enables you to connect the reactors in series or in parallel for extending the range of voltage and/or current. The individual modules can be installed above or next to one another

    Model No.StructureMax voltageMax current
    XZLSingle unitupto 400kV35A
    XZLCascadedupto 2000kV35A

    Application

    • For routine testing of high and ultra-high voltage cables up to 800 kV in accordance with IEC 60840 and IEC 62067

    • For inspection testing of high and ultra-high voltage cables and cable assemblies up to 1600 kV in accordance with IEC 60840 and IEC 62067

    • For applied voltage testing of power transformers up to 1600 kV in accordance with IEC 60076

    • For testing of gas-insulated switchgears up to 1600 kV in accordance with IEC 62271-203

    • For testing of voltage transformer including testing with higher frequencies and performing dynamic tests up to 1600 kV in accordance with IEC 60044

    Main components:

    • HV reactor

    • HV power filter (also Capacitive Voltage Divider)

    • Exciter transformer

    • Voltage Regulator

    • Control and Measuring System (manual operation or computer-aided automatic systems)

    Additional features and accessories:

    • Resonant circuits with variable frequency

    • low voltage power filter

    • 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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