ON-LINE PARTIAL DISCHARGE METER FOR STATOR WINDING OF HIGH VOLTAGE ROTATING MACHINE

摘要

The present invention relates to a partial discharge measuring device capable of always monitoring the deterioration state of the insulation by measuring the partial discharge signal generated in the large rotor stator winding in the operating state, conventionally attached to the rotor to measure the partial discharge signal from time to time There was no partial discharge measuring device available. Accordingly, in the present invention, the partial discharge of the stator winding of the rotor is sensed by a sensor and input through a coaxial cable, the measurement attenuator corresponding to the magnitude of the partial discharge signal is selected, the measurement range is set, and the input is selected through the selected measurement attenuator. Amplified partial discharge signal and passed through active band pass filter and filtered by band filter including 8 MHz to 10 MHz, which is a frequency band having an optimal response characteristic of partial discharge signal generated from stator winding of the rotor. After removing the signal, the maximum value of the filtered partial discharge signal can be detected and displayed on the instrument panel analogously and attached to the high voltage rotor. Even an inexperienced technician can often measure the magnitude of the partial discharge signal during normal operation or transient state of the rotor. To do it.