The WRM AC resonant test systems with variable inductance 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 frequency by setting the variable inductance of the HV reactor.
The modular concept with insulating case design enables you to connect the reactors in series or in parallel for extending the range of voltage and/or current.
Key features
» 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
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
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