Industrial Computer Control System for power frequency insulation Test with Testing Voltage Waveform Analysis

A power frequency insulation testing system of industrial computer-based on control, measurement and protection with testing voltage waveform analysis supplied the voltage from a testing transformer is presented. The whole testing process of power frequency withstanding voltage, breakdown and partial discharge test for high voltage electrical equipment can been automatically performed according to the testing criterion or the initialization defined by an user. The band-pass characteristic of combination wavelet is adopted to analyze testing voltage harmonics in the power frequency insulation test by the Matlab simulation. The simulation results demonstrate that the proposed scheme detects exactly harmonics of any frequency, and filters effectively the harmonics interference in testing voltage. The hardware configuration and software design of the system are proposed, and the measurement of testing voltage is mainly described in the tested equipment flashing-over. The industrial computer control system has been used successfully on some worksite for two years