Cable Oscillating Wave Partial Discharge Detection (Distribution Network)

By applying an attenuated oscillating-wave voltage close to power frequency to the cable under test, partial discharge signals from insulation defects are excited, detected, and located to judge insulation condition. Based on the LCR damped oscillation principle, after DC charging of the cable is completed, an internal high-voltage reactor, a high-voltage real-time solid-state switch, and the test cable form a damped oscillating voltage wave. Software displays partial discharge signals that occur in insulation weak points of the tested cable and its joints in a regular waveform. By analyzing waveform data, the discharge magnitude can be measured and the partial discharge location can be accurately pinpointed. The software can also control the damped oscillation waveform for multiple repetitions, making verification of insulation defects more reliable. The entire test process has no static electric field in the cable specimen and causes no space-charge accumulation or insulation damage in XLPE cables.