A short-circuit detection device and method for flux-constrained current-limiting switches

Abstract

The invention discloses a short-circuit detection device and method aiming at a magnetic flux constraint type current-limiting switch. The short-circuit detection device comprises a voltage detectioncircuit and a current detection circuit, wherein when a short-circuit fault occurs in the circuit, induced voltages generated at the two ends of an inductance coil are suddenly changed; the voltage detection circuit is connected in parallel with two ends of the inductance coil and is used for detecting voltages at two ends of the inductance coil; the voltage detection circuit carries out voltage stabilization and voltage reduction processing on the detected voltages at the two ends of the inductance coil, judges whether the voltage value after voltage stabilization and voltage reduction processing exceeds a preset voltage threshold value or not, generates a short-circuit alarm signal if the voltage value exceeds the preset voltage threshold value, and starts the magnetic flux constraint type current limiting switch to carry out current limiting; the current detection circuit is used for detecting the current of a circuit where the magnetic flux constraint type current-limiting switch is located, when the current exceeds a preset current threshold value, it is judged that the circuit generates a short-circuit fault, and the magnetic flux constraint type current-limiting switch is started for current limiting. The short-circuit fault can be rapidly and effectively detected.

Description

technical field [0001] The invention relates to the application field of power technology, and more particularly, to a short-circuit detection device and method for a magnetic flux-constrained current-limiting switch. Background technique [0002] The protection technology of my country's power system has experienced the development process from the transistor relay protection in the last century to the integrated circuit protection in the 1990s, and then to the computer relay protection in the 1990s. However, due to the rapid development of the power system, new requirements for its protection technology are constantly put forward, and the existing protection devices show its shortcomings. [0003] The short-circuit fault in the power system is one of the most serious faults in the system. The short-circuit current of the system caused by the short-circuit fault can reach hundreds of kiloamperes. power outages and immeasurable economic losses. However, the current power s...

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Problems solved by technology

[0005] Aiming at the defects of the prior art, the purpose of the present invention is to solve the existing method for detecting short-circuit faults of lines to judge whether a short-circuit fault has occurred in the line according to the magnitude of the line current, and is affected by the line impedance and the initial state of the short circuit, resulting in the determination of the line fault. It takes a long time for the threshold current of the fault to occur, which causes the current limiting operation to be sluggish and affects the technical problems of the current limiting speed

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