An electronic switch and hybrid high-voltage DC circuit breaker
An electronic switch, high-voltage direct current technology, applied in the direction of emergency protection circuit devices, electrical components, etc., can solve the problems of DC circuit breaker occupied area and operating loss, high manufacturing cost and operating cost of DC circuit breaker, and achieve high speed cut-off Fault current capability, cascaded structure is simplified and efficient, and the effect of quantity reduction
Active Publication Date: 2019-12-10
XJ ELECTRIC
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Problems solved by technology
[0006] With the increase of the number of electronic switches in the DC circuit breaker, the volume of the DC circuit breaker is also increasing, and the occupied area and operating loss of the DC circuit breaker are also increased accordingly, which makes the manufacturing cost and operating cost of the DC circuit breaker relatively high.
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[0035] The invention provides an electronic switch and a hybrid high-voltage direct current circuit breaker, which can not only shorten the fault current transfer time and the fault recovery time, but also reduce the manufacturing cost and operating cost of the high-voltage direct current circuit breaker.
[0036] When the DC circuit breaker is in normal operation, the mechanical switch of the main branch is closed, and the first electronic switch is turned on; when the fault current is detected, the second electronic switch of the transfer branch can be turned on to transfer the fault current to the circuit breaker. In the transfer branch, the mechanical switch of the main branch will be disconnected at the same time. The time from the commutation of the fault current to the transfer branch to the time when the fault current is fully transferred is the transfer time t1 of the fault current; the breaking time of the mechanical switch is t2, and then the fault occurs. The curren...
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The invention provides an electronic switch and a hybrid type high-voltage direct-current circuit breaker. The direct-current circuit breaker comprises a main branch circuit, a transfer branch circuitand an energy-consuming branch circuit which are connected in parallel; the main branch circuit and the transfer branch circuit are provided with electronic switches; the electronic switch comprisesa first branch circuit and a second branch circuit; at least three diodes are connected in series in each of the first branch circuit and the second branch circuit; the first branch circuit and the second branch circuit are connected in parallel; a first parallel end is connected with the anode of the first diode in the first branch circuit and the cathode of the first diode in the second branch circuit; a switching tube is disposed between the series connection point of the i-th diode and the (i+1)-th diode in the first branch circuit and the series connection point of the i-th diode and the(i+1)-th diode in the second branch circuit; and a corresponding lightning arrester is connected in parallel between the anode and cathode of each switching tube. With the electronic switch and the hybrid type high-voltage direct-current circuit breaker provided by the technical schemes of the invention adopted, the time of the transfer of fault current by the direct-current circuit breaker can beobviously shortened, and the manufacturing cost and operating cost of the hybrid type high-voltage direct-current circuit breaker are lower than those of direct-current circuit breakers of the same voltage level as the direct-current circuit breaker of the invention.
Description
Technical field [0001] The invention belongs to the technical field of high-voltage DC circuit breakers in power systems, and specifically relates to an electronic switch and a hybrid high-voltage DC circuit breaker. Background technique [0002] At present, high-voltage DC transmission technology has been widely used in our country, especially flexible DC transmission technology, which has enabled DC transmission technology to be applied to short-distance, small-capacity power transmission occasions. [0003] The high-voltage DC circuit breaker is a very important device in the flexible DC transmission system. According to the working principle of DC circuit breakers, they can be divided into mechanical circuit breakers, all-solid-state circuit breakers and hybrid circuit breakers. Among them, hybrid circuit breakers have the advantages of low on-state loss, short breaking time, and no need for special cooling. , is widely used in flexible DC transmission systems. [0004...
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IPC IPC(8): H02H7/26
CPCH02H7/268
Inventor 李娟范彩云胡四全张坤夏克鹏才利存黄永瑞张承
Owner XJ ELECTRIC