Partial discharge detection system and partial discharge identification method for high voltage power equipment

Abstract

The invention provides a partial discharge detection system and a partial discharge identification method for high voltage power equipment. The structure of the partial discharge detection system is that each HFCT (High Frequency Current Transformer) is mounted on a high voltage cable grounding wire; a transient electric wave sensor TEV is mounted on the outer wall of a switch cabinet; three HFCTs are respectively connected with a high-pass filter and a broadband gain amplifier through a BNC coaxial cable in sequence, and are connected to previous three channels of a data acquisition unit; one TEV is directly connected to a fourth channel of the data acquisition unit through another BNC coaxial cable; a phase signal acquisition unit is mounted on a high voltage cable and is connected with a low-pass filter and an external triggering interface of the data acquisition unit in sequence through another BNC coaxial cable. The partial discharge identification method comprises an identification method for partial discharge signals of the previous three channels and an identification method for a partial discharge signal of the fourth channel. The partial discharge detection system for the high voltage power equipment and the partial discharge identification method realize synchronous judgment for multi-source partial discharge, so as to improve the identification accuracy.

Description

technical field [0001] The invention relates to a partial discharge detection system and a partial discharge identification method of high-voltage electric equipment, and belongs to the technical field of partial discharge detection of electric power equipment. Background technique [0002] Compared with traditional overhead lines, power cable power supply has the advantages of not being affected by the external environment, saving land, and good electrical performance. With the development of urban power grids, the utilization rate of power cables continues to increase, and the reliability of cable operation has attracted the attention of the power sector. Due to its inherent installation complexity and long-term high-current continuous operation, coupled with the influence of external force damage, water tree intrusion, equipment defects, equipment defects, construction technology and other comprehensive factors, it is easy to cause cable operation failures. Partial disch...

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Problems solved by technology

However, the current partial discharge detection system for power equipment is restricted by two key factors. First, the noise and interference signals on site are very strong, and they are mixed with the partial discharge signal, so it is very difficult to automatically extract them; second, the partial discharge may come from The cable body, cable terminal connector, cable intermediate connector, and equipment connected at both ends of the cable, it is difficult to distinguish multi-source partial discharges

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