Power transmission line interphase short circuit detection system

Abstract

The invention provides a power transmission line interphase short circuit detection system, which consists of a voltage transformer, a charging module, a super capacitor bank, a high-frequency inversion module, an intelligent control module and a result output module, and aims to solve the problem that whether a high-voltage line interphase is an instantaneous short circuit fault or a permanent short circuit fault cannot be determined in the prior art. According to the power transmission line phase-to-phase short circuit detection system, a voltage transformer completes power taking of a high-voltage line, a charging module is used for charging a super capacitor to a target voltage, when fault detection is carried out, a super capacitor bank is used for discharging a post-stage circuit, and a high-frequency inversion module is started to generate a high-frequency voltage signal to carry out high-frequency injection on the high-voltage line at the same time; finally, the microprocessor is used for timing the discharge time of the super capacitor bank, whether the power transmission line is an instantaneous short-circuit fault or a permanent short-circuit fault is recognized according to the discharge time, and the system is simple in structure, convenient to carry and capable of quickly and accurately recognizing the property of the interphase short-circuit fault.

Description

technical field [0001] The invention relates to the technical field of high voltage, in particular to a detection system for short-circuit between phases of a transmission line. Background technique [0002] The existing high-voltage transmission lines in my country generally use automatic reclosing to solve the fault problem of the transmission line. The reclosing can improve the reliability of the power supply process to a certain extent, but the traditional reclosing will blindly reclose the permanent fault, which cannot be very good. To distinguish the nature of the fault, it is impossible to accurately identify the instantaneous fault and the permanent fault. On the other hand, because the exit delay of the recloser is fixed, if the traditional recloser cannot judge whether the arc at the fault point is extinguished in time, It is very likely that the reclosing is unsuccessful and the judgment is wrong. When these two situations occur, it will bring a series of bad influe...

AI Technical Summary

Problems solved by technology

[0002] my country's existing high-voltage transmission lines generally use automatic reclosing to solve the fault problem of transmission lines. Reclosing can improve the reliability of the power supply process to a certain extent, but traditional reclosing will blindly reclose on permanent faults, which cannot be done well. To distinguish the nature of the fault, it is impossible to accurately identify the instantaneous fault and the permanent fault. On the other hand, since the exit delay of the recloser is fixed, if the traditional recloser cannot judge whether the arc at the fault point is extinguished in time, It is very likely that the reclosing is unsuccessful and the judgment is wrong. When these two situations occur, it will bring a series of bad effects to the power system. At the same time, the line may be paralyzed, which cannot ensure the reliability, safety and stability of the power system. powered by

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