GIL arc discharge fault positioning method and system

Abstract

The invention belongs to the technical field of power transmission and transformation monitoring, and discloses a GIL arc discharge fault positioning method and system. The method comprises the following steps of respectively measuring and calculating the first fault area positioning and the third fault area positioning through a single-end traveling wave method and a double-end traveling wave method respectively, calculating the second fault area positioning through the time difference of arrival of traveling wave and ultrasonic wave signals to the corresponding detection points, and analyzing the above three positioning results to obtain the fault comprehensive positioning, inversely deducing the traveling wave velocity propagating in a GIL according to the fault comprehensive positioning, and substituting the traveling wave velocity into the single-end traveling wave method for optimization operation so as to position the subsequent fault more accurately and more comprehensively. The invention further provides a GIL arc discharge fault positioning system which comprises an ultrasonic sensor, a traveling wave sensor and a processing circuit with a calculation module, and the method can be executed through the processing circuit. According to the present invention, the problems that a traveling wave method is not high in positioning result precision and poor in reliability, and an ultrasonic method needs more sensors, are solved, and the accurate and reliable positioning of the arc faults of the GIL devices is achieved. The method is suitable for the fault monitoring of the GIL devices.

Description

technical field [0001] The invention belongs to the technical field of power transmission and transformation monitoring, and specifically discloses a GIL arc discharge fault location method and system. Background technique [0002] GIL (Gas-insulated Transmission Lines), gas-insulated transmission lines, is a kind of power transmission equipment that uses compressed SF6 gas (or mixed gas insulation), and the shell and conductor are coaxially arranged. GIL has the advantages of large transmission capacity, low unit loss, less impact on the environment, high operational reliability, and space saving. It has been widely used in the power transmission of hydropower stations and nuclear power stations for a long time. [0003] All aspects of GIL manufacturing, transportation, and on-site assembly may cause insulation defects inside it, and arc breakdown failures may easily occur during GIL withstand voltage tests or daily operation. Due to the large transmission capacity of GIL,...

AI Technical Summary

Problems solved by technology

The principle of this method is simple, but since the traveling wave propagates in the GIL at a speed close to the speed of light, a very small time error will cause a positioning deviation of hundreds of meters, and there are effects caused by dispersion and the structure of the GIL, so the wave head Algorithms for identification and wave velocity determination are not very reliable

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