Electric field distribution-based power transmission line insulator degradation detection discrimination method

Abstract

The invention relates to an electric field distribution-based power transmission line insulator degradation detection discrimination method. The method comprises the following steps of converting measured values of an axial electric field on the surface of an insulator of a 66-500kV power transmission line under different working conditions into corresponding voltage values so as to be compared with a standard value of a distribution voltage of the insulator of the power transmission line in a standard; and based on insulator degradation characteristic analysis of an electric field, when a low-zero-value insulator with insulation degradation occurs in a power transmission line, determining the insulation state of the insulator through the change of surface axial electric field distribution. An algorithm function is a function equipped for matched software. The method has the advantages that defects that existing inferior insulators need to be detected one by one and are greatly influenced by a temperature environment are effectively overcome, operation is easy and convenient, accuracy and stability are high, the detection efficiency of the degraded insulators of the power transmission line can be improved, the operation intensity is reduced, and the method has very important significance in guaranteeing safe and stable operation of the power transmission line; and a new technical discrimination method is provided for power transmission line insulator degradation detection.

Description

technical field [0001] The invention relates to the field of detection of insulators of transmission lines, in particular to a method for detecting deterioration of insulators of transmission lines based on electric field distribution. Background technique [0002] The safe and stable operation of the power system has been paid more and more attention. As an important insulating accessory, insulators have been widely used in high-voltage transmission lines, especially in the high-voltage AC and DC transmission systems that have been vigorously developed in recent years. The safe operation of insulators It directly affects the safety and reliability of the entire power transmission system. If insulators deteriorate, it will pose a great threat to the safety and reliability of power system operation. In the domestic power grid, line flashover accidents caused by degraded insulators often occur, which have caused huge losses to the national economy. With the continuous expans...

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Problems solved by technology

In the domestic power grid, line flashover accidents caused by degraded insulators often occur, which have caused huge losses to the national economy

With the continuous expansion of the scale of the power grid and the continuous increase of the running time of the insulators running on the grid, the insulators on the transmission line are subjected to electromechanical loads, sun and rain, and changes in cold and heat for a long time during operation, which will make the insulation performance of the insulators Or mechanical properties decline, and insulators deteriorate, which may lead to failures such as insulation resistance reduction, insulation cracking or even breakdown, and pose a potential threat to the power supply reliability of the power grid. Therefore, insulator status detection is a heavy task and of great significance. Work

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