Porcelain insulator resistance measuring device and method

Abstract

The invention provides a porcelain insulator resistance measuring device and method. The measuring device comprises a direct-current high-voltage power supply, a sampling voltage divider, a current sampling unit and a signal collecting and processing unit. The method comprises: inputting stable direct-current high voltage of the direct-current high-voltage power supply to two ends of the insulatorthrough the quick switch to generate a high-voltage pulse power supply signal; dividing the direct-current pulse high voltage into low-voltage pulses through a sampling voltage divider; in a no-loadstate, collecting voltages at the two ends of the sampling voltage divider, and calculating the equivalent capacitance of the sampling voltage divider; connecting the insulator, collecting the voltageacross the two ends of the insulator and the total leakage current flowing through the insulator, calculating the current of the equivalent capacitance of the insulator in combination with the equivalent capacitance of the sampling voltage divider, calculating the leakage current of the resistance of the insulator, and calculating the real resistance value of the insulator. According to the invention, errors caused by the equivalent capacitance of the insulator to the detection of the insulation resistance of the insulator under impact high voltage can be eliminated, so that the judgment of whether the insulator is degraded is more accurate.

Description

technical field [0001] The invention relates to the technical fields of electronics and high-voltage electric power, in particular to a method and device for measuring the resistance of porcelain insulators based on high-voltage pulse current analysis. Background technique [0002] High voltage insulator is one of the widely used equipment in power system. Its quality is directly related to the safety and stable operation of the power system, so it is very necessary to detect the inferior insulators in the insulators. Insulation resistance is an important parameter to characterize the quality of an insulator, and good insulation resistance is an important prerequisite for ensuring its normal operation. [0003] According to DL / T626-2005 "Deterioration Disc Suspension Insulator Inspection Regulations": the voltage level is lower than 500KV, the insulation resistance of the insulator is lower than 500M, it is a deteriorated insulator; At present, the methods used for on-line...

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Problems solved by technology

At present, the methods used for on-line detection of insulators mainly include: observation method, ultraviolet imaging method, infrared temperature measurement method, acoustic wave method, and electric field measurement method. In the prior art, infrared temperature measurement method, ultraviolet imaging method and acoustic wave method have hi

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