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Line current breaking device and control method thereof

A line current and current technology, which is applied in the direction of automatic disconnection emergency protection devices, circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, etc., can solve the problems of increased difficulty of wiring and damage to consistency

Active Publication Date: 2014-08-06
NR ELECTRIC CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The increase of power semiconductor devices in the second current direction destroys the consistency of the original layout direction, resulting in increased difficulty in device layout, installation and wiring

Method used

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  • Line current breaking device and control method thereof
  • Line current breaking device and control method thereof
  • Line current breaking device and control method thereof

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Embodiment Construction

[0032] Such as figure 1 As shown, a device 20 for breaking the current of a line 44 according to the present invention includes a unidirectional DC circuit breaker 10 and a bridge branch connected in parallel.

[0033]The one-way DC circuit breaker 10 includes a main circuit breaker 9 and a non-linear resistor 13 connected in parallel, wherein the main circuit breaker 9 includes at least one power semiconductor device 5 connected in series in the same direction, and the direction of the power semiconductor device 5 and The direction of the current flowing from node 1 to node 2 is consistent; the unidirectional DC circuit breaker 10 also includes a branch connected in parallel with the aforementioned main circuit breaker 9 and the non-linear resistor 13, and the branch includes high-speed switches connected in series 11 and an auxiliary circuit breaker 12, wherein the high-speed switch 11 includes at least one high-speed isolating switch connected in series, the auxiliary circu...

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Abstract

An apparatus (20) for breaking a current of a circuit (44) and a control method thereof. The apparatus (20) for breaking a current of a circuit (44) comprises a unidirectional direct current breaker (10) and a bridge branch circuit. The bridge branch circuit comprises two bridge arms formed by four identical commutating branch circuits (A, B, C, D), two groups comprising two commutating branch circuits each in the four commutating branch circuits are connected in series in the same direction, two formed bridge arms are connected in parallel, and each commutating branch circuit comprises a same-direction serial connection of at least one first power semiconductor device (7). Two bridge arms of the bridge branch circuit are both connected in parallel to the unidirectional direct current breaker (10), and two ends of the circuit (44) are separately connected to bridge arm middle points (3,4) of the two bridge arms. On the premise of enough high breaking speed and low loss, the apparatus (20) for breaking a current of a circuit (44) can greatly reduce the cost of the apparatus, and reduce the layout, mounting and wiring difficult of the apparatus and the device.

Description

technical field [0001] The invention relates to a device for breaking the current flowing through a line, and to a method of controlling the device. Background technique [0002] In the multi-terminal direct current transmission system, the high voltage direct current circuit breaker is one of the crucial equipments. Due to the high voltage level and small line impedance of the multi-terminal HVDC transmission system, once a line short-circuit fault occurs, it will quickly affect the DC transmission network and the AC network, and the fault must be removed quickly. Therefore, the high-voltage DC circuit breaker needs to operate quickly to minimize the fault duration or suppress the fault current, and reduce the impact of the fault on the AC / DC transmission network. Since the high-voltage DC circuit breaker is connected in series with the transmission line, the direction of the power flow in the transmission line is uncertain, and the current may have two directions. Therefo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01H9/54
CPCH02H3/08H02H9/00H02H9/025H02H3/087
Inventor 方太勋曹冬明王宇杨浩杨兵石巍吕玮
Owner NR ELECTRIC CO LTD
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