Oscillation operation wave loop parameter determination method and system based on cable switching-on overvoltage

Abstract

The invention discloses an oscillation operation wave loop parameter determination method and an oscillation operation wave loop parameter determination system based on cable closing overvoltage. Theoscillation operation wave loop parameter determination method comprises the following steps of: acquiring geometrical parameters of a to-be-tested cable and electrical parameters of a metal conductor, an insulating medium and a laying environment of the to-be-tested cable; acquiring a three-phase short-circuit current at a bus connected with a to-be-tested cable, and calculating to obtain equivalent impedance of a feed network; calculating to obtain cable impedance and admittance parameters according to the obtained geometric parameters and electrical parameters of the to-be-tested cable; andthe cable impedance and admittance parameters according to the obtained equivalent impedance of the feed network, the cable impedance and admittance parameters; calculating to obtain the natural resonant frequency and attenuation constant of the cable; and determining parameters of elements in an oscillatory wave loop according to the obtained natural resonant frequency and attenuation constant of the cable. The oscillation operation wave loop parameter determination method can save time and labor cost, can determine oscillating wave generator loop parameters required in a test, and improvingthe accuracy of a test result.

Description

technical field [0001] The invention belongs to the technical field of high voltage and insulation, and in particular relates to a method and system for determining parameters of an oscillating operation wave circuit based on cable closing overvoltage. Background technique [0002] High-voltage power cables transmit and distribute electric energy, and are used in urban backbone networks, power plant transmission, internal power supply of large industrial and mining enterprises, and underwater power transmission lines across rivers and seas. In domestic and foreign power transmission systems, the proportion of cables is gradually increasing. High-voltage power cables include cables of various voltage levels from 6 to 500kV. According to the insulating material, cables can be divided into oil-impregnated paper, rubber and plastic, XLPE cables, etc.; according to the type of transmission current, they can be divided into AC and DC cables. [0003] Plastic cables are simple in...

AI Technical Summary

Problems solved by technology

[0007] The traditional withstand voltage test and transient shock damage the insulation just like the difference between a knife and a saw. The withstand voltage test cannot really reflect the ability of the insulation of the cable body and accessories to withstand operating transient overvoltages.

Images