Half-wavelength line fault detection method and protection method and corresponding devices

Abstract

The invention relates to a half-wavelength line fault detection method and protection method and corresponding devices. Firstly, the voltage and the current at both ends are subjected to phase mode conversion to obtain the modulus of the voltage and the current at both sides, and then the fault components of the voltage and the current at both sides are obtained. The following processes are then performed on each of the two sides: judging the direction of the sudden change at the arrival time of the traveling wave head of the fault component of the voltage and the current on the side, then determining the fault direction according to whether the polarities of the fault components of the voltage and the current on the side are the same or not, and finally, determining whether the fault position is in a zone or out of a zoneby comparing the fault directions on both sides, so that the corresponding protection action can be carried out according to the determined fault. This method is specially used to detect the fault of half-wavelength lines, and can accurately detect the fault type of half-wavelength lines. According to the determined fault type, the subsequent protection action canbe carried out. Therefore, the fault detection method and protection method, and the corresponding devices have high reliability and specificity.

Description

technical field [0001] The invention relates to a half-wavelength line fault detection method, a protection method and a corresponding device, and belongs to the technical field of half-wavelength line fault detection. Background technique [0002] Half-wavelength AC power transmission technology refers to the ultra-long-distance three-phase AC power transmission whose electrical distance is close to one power frequency half-wavelength, that is, 3000km (50Hz) or 2600km (60Hz). The half-wavelength transmission line does not need to install reactive power compensation devices, and does not need to add intermediate switch stations. It is economical and reliable, and can realize long-distance synchronous networking. It is a very feasible long-distance and large-capacity power Transmission technology can realize the allocation and consumption of energy across the country. [0003] The distance between my country's western energy bases and eastern load centers can reach 3,000km. ...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a half-wavelength line fault detection method and detection device for detecting half-wavelength line faults to solve the problem of poor accuracy when using existing fault detection methods for half-wavelength line fault detection question

The object of the present invention is to also provide a half-wavelength line fault protection method and protection device, which are used to perform protection actions according to the detected half-wavelength line faults, so as to solve the problem of using existing fault protection methods to perform fault protection on half-wavelength lines The problem of poor reliability when

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