Partial discharging detection device for GIS device under oscillating impulse voltage

Abstract

The invention relates to a partial discharging detection device for a GIS device under an oscillating impulse voltage. The partial discharging detection device comprises an oscillation impulse voltage generator; and the output of the oscillation impulse voltage generator is applied to a GIS device. A capacitive voltage divider is connected between the output of the oscillation impulse voltage generator and the ground. A high-frequency current sensor for measuring a partial discharging signal of the GIS device is installed at the GIS device; the output of the high-frequency current sensor is connected with a signal conditioner; and the output of the signal conditioner is connected with a high-speed acquisition card. The high-speed acquisition card can receive a discharging reference quantity signal. The high-speed acquisition card carries out analog-to-digital conversion on the received signal and then outputs the processed signal to an analysis host; the analysis host carries out feature extraction and mode identification on a partial discharging signal to determine a discharging degree and a discharging type. Therefore, various defects inside the GIS device can be detected well and the powerful security guarantee can be provided for GIS operation.

Description

technical field [0001] The invention relates to the ultra-high frequency partial discharge detection of GIS under oscillating impulse voltage. The partial discharge signal of GIS under the oscillating impulse voltage is measured by the high-frequency current sensor, and the denoising, feature extraction and pattern recognition are carried out through software analysis to determine the type and degree of partial discharge and eliminate the potential safety hazards in the GIS equipment. An important guarantee for the safe operation of the power system. Background technique [0002] Since GIS (Gas Insulated Switchgear) equipment was put into practical use in the 1960s, due to its advantages of compact structure, small footprint, high reliability, flexible configuration, convenient installation, strong safety, and strong environmental adaptability, it has been widely used in my country's electric power industry. The system is widely used in high-voltage power transmission and tr...

AI Technical Summary

Problems solved by technology

However, with the continuous improvement of the equipment voltage level, the power frequency withstand voltage test and partial discharge detection of the equipment under the high voltage level can no longer meet the requirements to detect all defects

Studies have shown that the AC withstand voltage test and its partial discharge detection have high sensitivity to surface contamination of insulators or air gap defects in GIS, but for local electric field concentration such as metal spikes on the conductor or ground terminal and scratches on the electrode surface, etc. Insufficient or even ineffective situation detection capabilities

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