T&D World Magazine

Oscillating Wave Test System Locates Partial Discharge Faults

The oscillating wave test system from HDW Electric can be used to identify, evaluate, and locate partial discharge (PD) faults in a cable insulation and in joints and terminations. The system can be used for all types of medium-voltage cables. Detailed information of the operational reliability of a cable system can be determined.

The test system can be installed either in a cable test van in combination with a modem, centrally controlled cable test and fault location system (e. g. compact PD in a 3.5 t vehicle), or can be used as a stand-alone unit.

It features:

· PD diagnosis under oscillating wave test voltage - electrical field distribution as in nominal service conditions.
· PD evaluation possibility and pattern recognition at nominal voltage level.
· Modern industrial PC for system control and user interface.
· PD level measurement according to IEC 270 at a bandwidth of 150 to 650 kHz.
· Semi and fully automatic PD analyzing software for defect location with mapping feature.
· Calculation of the cable capacitance and the tan delta value of the test object from the characteristic decrease of the voltage wave shape.
· Simple to use and easy to handle menu-driven unit for operation of the test sequence.
· Compact design; low weight.
· Compact PD: combination of OWTS, VLF test unit and the fault location system.

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