An intensity grading system and method based on partial discharge of electrical equipment

Abstract

The invention proposes an intensity grading system and method based on partial discharge of electrical equipment. The system of the invention includes multiple optical signal transmission units, multiple signal conditioning units, multiple data acquisition cards and data terminals. The method of the present invention utilizes the switchgear to establish a three-dimensional coordinate system, and the length, width and height of the switchgear coincide with the axes of the three-dimensional coordinate system respectively; the collimating mirror probes in a plurality of optical signal transmission units are divided into multiple groups, and placed symmetrically ; through the corresponding optical signal transmission unit, signal conditioning unit and data acquisition card to collect the real-time voltage digital signal converted from partial discharge radiation ultraviolet light and transmit it to the data terminal; the data terminal counts the number of pulses of the real-time voltage digital signal and performs weighting For calculation, the high-voltage partial discharge source is placed inside the switch cabinet and multiple levels of discharge power are set to construct a pulse array matrix, and the intensity classification of partial discharge is established through the pulse array matrix and multiple levels of discharge power.

Description

technical field [0001] The invention belongs to the technical field of partial discharge monitoring of electrical equipment, and in particular relates to an intensity grading system and method based on partial discharge of electrical equipment. Background technique [0002] my country's power system is developing in the direction of large-scale, long-distance, UHV, intelligent, and AC / DC hybrid transmission. The safe operation of electrical equipment is an important guarantee for the safe and reliable operation of the power grid. However, quality defects in the design and manufacture of electrical equipment, mechanical damage caused by transportation and installation, and long-term exposure to high voltage, strong electric field and harsh weather The operation of the electrical equipment has become a factor in the decline of the insulation performance of electrical equipment. Coincidentally, the long-term small-scale and mild partial discharge is the main reason for the fur...

AI Technical Summary

Problems solved by technology

The safe operation of electrical equipment is an important guarantee for the safe and reliable operation of the power grid. However, quality defects in the design and manufacture of electrical equipment, mechanical damage caused by transportation and installation, and long-term exposure to high voltage, strong electric field and harsh weather The operation of the electrical equipment has become a factor that reduces the insulation performance of electrical equipment.

Coincidentally, the long-term small-scale and mild partial discharge is the main reason for the further decline of the insulation of electrical equipment. As time accumulates, the scale, frequency and intensity of partial discharge gradually increase, and the insulation condition of electrical equipment forms a positive feedback. A vicious cycle that will eventually lead to the destruction of the entire insulation system

Serious insulation accidents may threaten the safety of staff, cause large-scale power outages, and cause economic losses

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