During cable acceptance or preventive tests, some technicians attempt to use DC withstand voltage instead of very low frequency withstand voltage. The electric field distribution under DC voltage differs from that under power frequency conditions, and its effectiveness in detecting insulation defects is limited. The very low frequency withstand voltage test device uses 0.1Hz alternating voltage, which is closer to the actual operating electric field distribution and helps discover defects such as water trees and local aging.
The device's output voltage and output current are displayed on dual meters. The pointer meter displays the changing values of voltage and current, making it easy to observe the voltage boost process; the digital meter displays the positive and negative peak values of voltage and current, making it easy to read. Main parameters: rated voltage 60kV, load capacity 1.1μF, frequency 0.1Hz, sine wave waveform, ambient temperature 0-40℃, relative humidity ≤85%RH.
It is suitable for insulation withstand voltage tests of equipment such as cross-linked polyethylene power cables, generators, and motors. In cable acceptance tests, 0.1Hz very low frequency voltage can effectively evaluate insulation status. During preventive tests, insulation degradation trends can be judged by comparing historical data.
