Detection method and detection system for extra-high voltage power transmission line lightning arrester

Abstract

The invention provides a detection method for an extra-high voltage power transmission line lightning arrester, which belongs to the technical field of electrics. The method comprises the steps of hoisting a direct-current high-voltage generator assembly on a tower, connecting the grounding end of the direct-current high-voltage generator assembly to a grounding block of a tower, connecting the pressurization end of a first lightning arrester in the lightning arrester set to the high-voltage output end of the direct-current high-voltage generator assembly, grounding the grounding end of the first lightning arrester, and suspending a second lightning arrester adjacent to the pressurization end of the first lightning arrester, connecting a third lightning arrester adjacent to the suspended end of the second lightning arrester to the bottom current measurement output end of the direct-current high-voltage generator assembly, and grounding the lightning arresters, except the first lightning arrester, the second lightning arrester and the third lightning arrester, in the lightning arrester group, remotely controlling the direct-current high-voltage generator assembly to carry out direct-current reference voltage and leakage current testing on the first lightning arrester, and after the test is finished, enabling the direct-current high-voltage generator assembly to be grounded and discharge. The invention also provides a detection system of the extra-high voltage power transmission line lightning arrester.

Description

technical field [0001] The invention relates to the field of electrical technology, in particular to a detection method and a detection system for an ultra-high voltage transmission line lightning arrester. Background technique [0002] Surge arresters are used to limit lightning overvoltage and operating overvoltage, thereby protecting equipment or transmission lines in substations from overvoltage damage. When put into use, the arrester has been subjected to power frequency or DC voltage for a long time, and the influence of water vapor and pollution in the environment. The metal oxide valve plate inside the arrester is susceptible to moisture and aging, which can easily lead to temperature rise or even explosion. [0003] In order to solve potential safety hazards, an effective method is to conduct a DC reference voltage test and leakage current measurement on the arrester. The changes in the detected parameters such as DC reference voltage and DC leakage current can effe...

AI Technical Summary

Problems solved by technology

[0004] The voltage level of the UHV transmission line is high, and the arresters are usually arranged in multiple series and hung on the tower. Due to the high tower of the transmission line, even the last arrester will be tens of meters away from the ground. The existing detection method is It is extremely time-consuming and labor-intensive: use a large-tonnage crane to remove the arrester from the tower and the wire and lower it to the open ground for testing, disassemble the arresters in series one by one, and arrange safety fences. After the test of each arrester (component) is completed, then Reassemble it with a crane, and re-hoist it to the height where it is installed to the hoisting position of the arrester

This detection method has many disadvantages: During the whole test work process, the operators are faced with the risk of high-voltage electric shock, personal safety problems when the equipment is hoisted, disassembled and assembled, and there is a risk of equipment damage during the process of disassembly, assembly, and hoisting ; In addition, after the arrester is disassembled and placed in a limited space, it is likely to generate stray currents. If it is not placed properly, it may cause damage to the arrester. Even if the test passes, there may be metal powder, dust, water vapor, etc. mixed in during reinstallation The connection point will cause the arrester to fail; the disassembly and installation of the arrester requires a large-tonnage crane to operate, occupying a large work site, and at the same time requires many testers to work, consuming a lot of manpower and material resources

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