Method for monitoring resistance of valve discs of arresters based on resistance-capacitance network

Abstract

The invention discloses a method for monitoring resistance of valve discs of arresters based on a resistance-capacitance network. The method includes the first step of building an arrestor three-dimensional resistance-capacitance network model based on a three-dimensional finite element static electric field, the second step of solving partition capacitance between the arrestors and capacitance of the valve discs of the arresters, the third step of installing leaked current measurement devices on flanges at the lowest ends of the arresters operating on site, and obtaining actual leaked current measurement values and actual phase angle difference measurement values of the arresters, and the fourth step of solving resistance of the valve discs of the arresters in an iteration mode. The resistance valve of the valve discs of the arresters in operating states can be accurately obtained in the method, errors are controllable, requirements of a project can be met, operation conditions of the arresters are directly and effectively monitored, and meanwhile accurate data references an be provided for power grid operation and maintenance staff; the method is suitable for being used for monitoring a high-voltage zinc oxide arrestor on line.

Description

technical field [0001] The invention belongs to the on-line monitoring technology of a high-voltage zinc oxide arrester, in particular to a method for monitoring the resistance of an arrester valve sheet based on a resistance-capacity network. Background technique [0002] The power system may cause atmospheric overvoltage due to lightning strikes, and internal overvoltage due to electromagnetic energy conversion inside the power system. For overvoltage, overvoltage protectors are usually used to prevent overvoltages. At present, zinc oxide arresters are more commonly used. The function of the arrester is to limit the overvoltage to protect the electrical equipment. The arrester is to artificially create a weak point of insulation on the line or equipment, that is, a gap device. The breakdown voltage of the gap is lower than the lightning impulse insulation level of the line or equipment. Under normal operating voltage The gap is in the state of isolation and insulation. Un...

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problem that the existing on-line monitoring technology of arresters cannot accurately eliminate the interference between phases and surrounding charged bodies, the present invention provides a method for monitoring the resistance of arrester valves based on a resistance-capacitance network. chip resistance, so as to realize the accurate judgment of the operating state of the arrester

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