HIGHVOLT Prüftechnik Dresden GmbH

    AC resonant test system with variable inductance, modular insulating case

    HV-test system for transformer testingThe WRM AC resonant test systems with variable inductance are used for factory testing of high and ultra-high voltage cables, power transformers, and gas-insulated switchgears.They use the resonance between the capacitive test object and the inductive HV reactor of the test system to generate a continuous sinusoidal high voltage. The natural resonance frequency of the test circuit is matched to the feed-in mains frequency 50/60 Hz by setting the variable inductance of the HV reactor. The HV reactor and the test object form a series resonant circuit, resulting in an ideal sinusoidal resonance voltage. The oil-cooled HV reactor 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.

    Application

    HV-test system for cable testing

    • 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

    Benefits

    • Low level of partial discharge < 2 pC
    • Extremely high test voltages thanks to the possibility of cascading the
      high voltage modules
    • High degree of variability of voltage and power parameters thanks
      to single, series, or parallel operation of high voltage modules
    • Low supply power thanks to high-quality resonance reactor
    • Ideal sinusoidal test voltage thanks to series resonant circuit
    • Low noise level thanks to special mechanical design
    • Low maintenance operation over the entire service life of the test system
       

     

    Technical parameters/system types