Calculation method for positioning flashover path of multi-cavity structure

Abstract

The invention discloses a calculation method for calculating a positioning flashover path of a multi-cavity structure. The calculation method for positioning the flashover path of the multi-cavity structure comprises the following steps: acquiring an equivalent air gap distance according to a breakdown voltage in combination with a relation curve of a rod-rod electrode U50% and a gap distance; according to the number of the cavities and the equivalent air gap distance, performing data fitting and drawing a fitting curve; and according to the established fitting curve, fitting a relation formula between the number of the cavities and the air gap distance. According to the invention, the external series air gap distance can be set, the flashover path can be positioned, and the installation of the multi-cavity structure and the external series air gap can be guided. Thus, the flashover path is restrained in the cavity, the insulator string is prevented from flashover to damage the insulator, safe and reliable operation of the line is guaranteed, and the device has important significance in practical application.

Description

technical field [0001] The invention relates to the field of electric power technology, in particular to a calculation method for locating a flashover path in a multi-chamber structure. Background technique [0002] As my country's demand for electric energy continues to increase, more stringent requirements are put forward for the safety and stability of the line, and frequent lightning activities often pose a serious threat to the safety of the line. Distribution lines are more prone to flashover due to low lightning withstand level and insulation level. General induced lightning overvoltage and direct lightning overvoltage may cause flashover of insulators, resulting in power supply interruption or short circuit, which seriously threatens the safety of power grid operation. [0003] The main component of the multi-chamber arc extinguishing device is a multi-chamber system, which consists of a considerable number of steel ball electrodes covered by insulating materials suc...

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Problems solved by technology

[0004] However, at present, the equivalent calculation of the multi-chamber arc extinguishing device and the external series air gap has not yet been carried out. There is a lack of certain basis for judgment, and the length of the air gap cannot be set more reasonably to protect the insulator from arc burns and damage. fast quenching arc

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