Icing flashover influencing factor evaluation method for overhead lines under surge and power frequency superimposed voltage

Abstract

The invention discloses an icing flashover influencing factor evaluation method for overhead lines under surge and power frequency superimposed voltage. The icing flashover influencing factor evaluation method for overhead lines under surge and power frequency superimposed voltage applies the power frequency voltage to an overhead line through a power frequency voltage generating unit, and then applies the surge voltage to the overhead line through a surge voltage generating unit, to simulate the situation that the overhead line is subjected to lightning and the operation is overvoltage so asto reproduce the actual complex condition for operation of the overhead line. The icing flashover influencing factor evaluation method for overhead lines under surge and power frequency superimposed voltage can not only preferably simulate the icing situation of an insulator in a natural environment, but also can simulate the icing flashover fault of the overhead line under the pollution level condition in different areas, so as to obtain the relationship between the surge flashover voltage and the conductivity of the salting liquid of an ice layer of the surface of the ice-covered insulator to evaluate the influencing factors of icing flashover to find the weakest link and provide the basic data and opinions for power system design with the flashover voltage that is the easiest to flash.

Description

technical field [0001] The invention belongs to the technical field of fault simulation in electric power engineering, and relates to an icing flashover fault simulation technology, in particular to a method for evaluating factors affecting icing flashover of overhead lines under shock and power frequency superimposed voltage. Background technique [0002] my country has a vast territory, and power lines are widely distributed. It is very common for insulators to be covered by ice and snow. The resulting ice flashover is also a common line fault in this field. The common lightning and operating overvoltage also have a great impact on the transmission line, and it is easy to generate impulse voltage; under the impulse voltage, ice-covered flashover is more likely to occur, resulting in short circuit of the line, interruption of power supply, affecting the reliability of power supply of the power grid, and endangering Safety of power grid and equipment. [0003] The patent ap...

AI Technical Summary

Problems solved by technology

[0005] In view of the technical status quo that the current flashover fault simulation device does not consider the effects of impact and power frequency superimposed voltage, the present invention aims to provide a method for evaluating the impact factors of overhead line icing flashover under shock and power frequency superimposed voltage, so as to more realistically simulate Icing flashover faults caused by lightning, operating overvoltage and other impulse voltages on overhead lines, and its influencing factors are evaluated to provide advice for power system design

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