Fault current limiter based on fast switch and triggered vacuum switch

Abstract

A fault current limiter based on a fast switch and a triggered vacuum switch is disclosed, which comprises a fast switch (1) and a current limiting resistor (2) which are connected in parallel, wherein, a first pulse capacitor (3), a first inductor (4) and a first triggered vacuum switch (5) are connected in series between two ends of the fast switch (1); a second pulse capacitor (6), a second inductor (7) and a second triggered vacuum switch (8) are connected in series between two ends of the current limiting resistor (2). The invention: 1) enables short circuit current to be incapable of reaching a first current peak value in a state of infinite current; 2) causes arc current of the fast switch to achieve fast zero crossing and then arc blowout; 3) can pass through large pulse current at high triggering speed and can achieve arc blowout at the time of the zero crossing of the pulse current; 4) can rapidly inhibit the short circuit current; 5) and automatically limits current subsequent to the short circuit of a system to ensure quality of power supply and save establishment expenditure of network.

Description

technical field [0001] The invention belongs to the technical field of electrical engineering, and in particular relates to a fault current limiter based on a fast switch and a trigger vacuum switch, which is suitable for automatic fast current limiting processing when a short circuit fault occurs in a power system. Background technique [0002] In recent years, the current short-circuit failure rate of my country's power system has risen sharply with the increase of power supply capacity and the expansion of the grid scale. When short-circuits occur near the generator and main transformer, the short-circuit current can reach or exceed the level of 80-100kA. However, the existing circuit breaker faces such a large short-circuit current, and the following problems have been exposed through practical tests: [0003] (1) The rated short-circuit breaking current is less than 63kA, and the breaking capacity cannot meet the requirements; [0004] (2) There is no current limiting ...

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Problems solved by technology

[0003] (1) The rated short-circuit breaking current is less than 63kA, and the breaking capacity cannot meet the requirements;

[0004] (2), does not have the current limiting function, the full break time is as long as 60~200ms

[0005] At present, the main measures to limit the short-circuit current are the use of current-limiting reactors, the use of high-impedance transformers, or changing the operating mode, but all of these measures have or increase energy consumption, or reduce power quality, or reduce power supply capacity and poor reliability of power supply. and other defects

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