Direct-current voltage withstanding test method for multilevel zinc oxide lightning arresters

Abstract

The invention relates to a direct-current voltage withstanding test method for multilevel zinc oxide lightning arresters. The zinc oxide lightning arresters of over two levels are connected in turn, the top of the zinc oxide lightning arrester of the top level is grounded, and the zinc oxide lightning arrester of the lower level is grounded through a second wireless current measuring unit; and the output end of a direct-current high-voltage generator is connected to the middle of the lightning arresters of any two levels through a first wireless current measuring unit, the first wireless current measuring unit and the second wireless current measuring unit acquire sampling current I1 and sampling current I2 respectively, the sampling current I1 and the sampling current I2 are sent to a controller through wireless data transmission modules of the wireless current measuring units, the controller receives and analyzes the sampling current in real time to control the output voltage of the direct-current high-voltage generator, and the controller records the corresponding output voltage of the direct-current high-voltage generator when the detected leakage current on a high-voltage loop of each zinc oxide lightning arrester achieves the test requirement. The method has the characteristics of convenient operation, wirelessly samples and measures two paths of high-voltage current, reduces the connection times, and improves the working efficiency and the reliability.

Description

technical field [0001] The invention relates to a direct-current withstand voltage test method for a multistage zinc oxide arrester, and belongs to the technical field of lightning arrester withstand voltage test. Background technique [0002] At present, zinc oxide arresters with relatively high voltage levels mostly adopt multi-stage structures, which can reduce the voltage and capacity requirements for a single DC withstand voltage test device. During the DC withstand voltage test, the DC withstand voltage value of each level of zinc oxide arrester is measured by changing the wiring combination method of the DC test device at each level of zinc oxide arrester. device, increasing the wiring between the zinc oxide arresters brings additional workload, the operation is cumbersome, and the work efficiency of the test cannot be improved. Since it is necessary to frequently change the DC test device to be connected to the zinc oxide arresters at all levels, it also brings grea...

AI Technical Summary

Problems solved by technology

[0002] At present, zinc oxide arresters with relatively high voltage levels mostly adopt multi-stage structures, which can reduce the voltage and capacity requirements for a single DC withstand voltage test device. During the DC withstand voltage test, the DC withstand voltage value of each level of zinc oxide arrester is measured by changing the wiring combination method of the DC test device at each level of zinc oxide arrester. device, increasing the wiring between zinc oxide arresters brings additional workload, cumbersome operation, and cannot improve the working efficiency of the test

Since it is necessary to frequently change the DC test device to be connected to the zinc oxide arrester at all levels, it also brings a great potential safety hazard

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