High altitude 35kV and below line insulator overvoltage characteristic determination method

Abstract

The invention belongs to the technical field of live operation maintenance, and particularly relates to a high altitude 35kV and below line insulator overvoltage characteristic determination method comprising the following steps that (1) the altitude condition is determined; (2) the test equipment is determined; (3) the insulator overvoltage test is performed; (4) the breakdown discharge characteristic is determined; and (5) safety margin and risk analysis is performed. The 35kV and below line insulator overvoltage test is performed in the high altitude region to determine the insulator overvoltage discharge characteristic. When live operation is performed in the high altitude region, the key parameter of the number of the 35kV and below line live operation insulators of the high altituderegion is finally determined by searching the discharge curve, the number of good insulators required for live operation is determined, the problem of error in comparison with the actual condition canbe solved, the basis can be provided for the safety of 35kV and below line live operation in the high altitude region, and the method plays an active role for promoting the development of 35kV and below line live operation in the high altitude region.

Description

technical field [0001] The invention belongs to the technical field of live work maintenance, and in particular relates to a method for determining the overvoltage characteristics of line insulators at high altitudes of 35kV and below. Background technique [0002] In terms of live work, domestic electric power supply enterprises or relevant research institutes have not conducted systematic tests on the impact of overvoltage on insulators in high-altitude areas of 35kV and below, and have not found the safety margin required for operations using relevant test data and risk rate calculation and analysis, as well as the safety technical requirements for carrying out 35kV and below live line work in high altitude areas. Only the conventional altitude correction coefficient is used to directly correct the number of insulators required for live work, without first correcting the corresponding voltage, and then checking the discharge curve to obtain the corresponding number of ins...

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Problems solved by technology

[0002] In terms of live work, domestic electric power supply enterprises or relevant research institutes have not conducted systematic tests on the impact of overvoltage on insulators in high-altitude areas of 35kV and below, and have not found the safety margin required for operations using relevant test data and risk rate calculation analysis, as well as the safety technical requirements required for carrying out 35kV and below live line work in high altitude areas

Only the conventional altitude correction coefficient is used to directly correct the number of insulators required for live work, without first correcting the corresponding voltage, and then checking the discharge curve to obtain the corresponding number of insulators. Compared with the actual working conditions, there are There is a certain error, and it is difficult to find the corresponding discharge curve in actual work; secondly, due to the small electrical distance of 35kV and below equipment, and the increase of the operating distance after correction makes the operation more difficult, which in turn restricts the development of live work

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