Variable Frequency Resonant Test Systems vary the output frequency to tune the system to the load capacitance in turn creating a resonance circuit. The output frequency is typically in the range of 30 to 300 Hz. These systems utilize a 3-phase input and have a larger tuning range than variable inductance test sets. The variable frequency resonant design is ideal for commissioning tests of GIS and cable since they are smaller and size than other systems.

In addition the variable frequency test set allows performance of tests within a frequency range close to power frequency.  The relatively low testing power required compared to conventional non compensated test sets, and the ability to make a direct comparison of the factory and field tests, favors the Variable Frequency Resonant Test System as the most practical on-site test system.

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High Voltage - High Current - High Power
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