Electromagnetic repulsion drives silver disc breaker
A technology of electromagnetic repulsion and silver sheet, which is applied in the direction of protection against overcurrent, can solve the problems of demanding environmental temperature, large overall volume, poor economy, etc., to improve breaking speed and reliability, and broad engineering application Prospects, the effect of meeting the temperature rise requirements
Active Publication Date: 2016-05-04
NAVAL UNIV OF ENG PLA
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Problems solved by technology
The limitations of using explosives to drive are: ①The life of explosives is limited, and will gradually decompose and fail with the increase of use time; ②Explosives and other pyrotechnic products are expensive, and need to be replaced after each action, which is economical; ③Requirements for ambient temperature Harsh; ④The noise is loud when the short circuit is broken, and sparks will be generated when it explodes. When used in some special occasions with flammable gases, a closed box is required, and the overall volume is large
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[0021] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments to facilitate a clear understanding of the present invention, but they do not limit the present invention.
[0022] Such as figure 1 As shown, the present invention includes a repulsion drive circuit and a repulsion coil L connected in the repulsion drive circuit 0 . The repulsion drive circuit includes a capacitor C connected in series with a pre-charged voltage 0 , Thyristor F 0 and freewheeling diode D 0 , capacitor C 0 The positive and negative poles are respectively connected to the freewheeling diode D 0 Negative pole, thyristor F 0 Cathode connection, freewheeling diode D 0 Anode and thyristor F 0 Anode connection, repulsion coil L 0 in series with capacitor C 0 with thyristor F 0 between and with the freewheeling diode D 0 Parallel, Thyristor F 0 It turns on after receiving the trigger signal Rt from the external cir...
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The invention relates to an interrupter which rapidly limits and cuts off current at the short-circuit failure time of a power grid, in particular to a sliver plate type interrupter driven by electromagnetic repulsion force. The sliver plate type interrupter comprises a repulsion force drive circuit, a repulsion force coil, two wiring terminals and a fuse body, wherein the repulsion force coil is connected in the repulsion force drive circuit, and the fuse body is arranged between the two wiring terminals in a bridging mode. A repulsion force disc is arranged below the fuse body, and located above the repulsion force coil. The repulsion force disc is fixed with insulation gate pieces. According to the sliver plate type interrupter, an electromagnetic repulsion force drive technology replaces an explosive drive technology, the defect of the explosive drive technology is overcome, and a structure, in which the fuse body is arranged between the two wiring terminals, is used as a throughflow circuit. Not only is requirement for temperature raise of large current circulation met, but also required energy for cutting off the interrupter is greatly reduced. Cost is greatly reduced, speed and reliability of disjunction are improved, and the interrupter has a wide engineering application prospect and a good economic benefit.
Description
technical field [0001] The invention relates to a breaker for rapid current-limiting breaking when a power grid short-circuit fault occurs, in particular to a silver-plate type breaker driven by electromagnetic repulsion. Background technique [0002] With the increasing level of short-circuit current in the power grid, the peak value of short-circuit current can reach more than 100kA, and the rising rate of short-circuit current di / dt is extremely high. The limit breaking capacity of traditional circuit breakers is insufficient, and the operating time is long, so it is difficult to meet short-circuit faults. Requirements for fast current-limiting breaking. Installing a new fault current limiting device (FCL) in the power grid is an ideal solution to this kind of problem. Research on new current limiting devices with various principles has been carried out at home and abroad, such as superconducting current limiter, solid state current limiter, Liquid metal current limiter,...
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IPC IPC(8): H02H3/08
Inventor 庄劲武王晨袁志方张超徐国顺江壮贤
Owner NAVAL UNIV OF ENG PLA