Device and method for online monitoring power supply system external insulation filthy status

Abstract

Aiming to some disadvantages in the passive on-line monitoring methods adopting sensors sampling in existence, the present invention provides an initiative type on-line monitoring device and method thereof with its monitoring system outer insulation surface being in a dirt state. The input of said monitoring device lower machine is connected respectively to two routes of sampling signals: one route is connected to a direct current superposition unit through a neutral point of a voltage transformer connected to a three-phase overhead line, wherein a protection unit and a filtering unit are connected in serial between the superposition unit and the ground, which output is connected to the lower machine through a sampling signal adjusting unit; the other route is connected to an impulse current sensor through a groups of connection wires between neutral points of three-phase high voltage isolation capacitor and the ground, which is connected to the lower machine through pulse shaping and a count unit. The present invention with a powerful anti-interference ability and without adding a sensor to insulators, is suitable for an on-line monitoring of the outer insulation dirt sate of AC220V-35kv low voltage distribution station / circuit.

Description

technical field [0001] The invention relates to an on-line monitoring device and method for a power supply system, in particular to an on-line monitoring device and method for the pollution state of the external insulation of a short-distance 220V-35kV power supply system. Background technique [0002] With the increasing development of industrial and agricultural production, the pollution of the external insulation surface of the power supply system is becoming more and more serious. The dirt deposited on the insulator is prone to pollution flashover in the weather with high humidity, which seriously affects the reliability of the power supply system. According to statistics, the number of pollution flashover accidents is second only to lightning damage in the total number of accidents in the power system, but the damage caused by pollution flashover accidents is 10 times that of lightning damage. Almost all of the country's six major power grids have experienced large-scal...

AI Technical Summary

Problems solved by technology

Thereby the following deficiencies are exposed, (1) the existing on-line measurement method with point instead of surface cannot monitor all insulators or bushings at the same time; (2) the measurement must be carried out by splitting and time-sharing, and high-speed sampling cannot be realized; (3) the sensor There are many and complicated lines; (4) they are all passive monitoring methods, and the sampling of new signals is greatly disturbed

Images