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Hybrid DC circuit breaker

A DC circuit breaker, hybrid technology, applied in the direction of circuit devices, emergency protection circuit devices, emergency protection devices for automatic disconnection, etc., can solve the problems of mechanical switches without arc breaking, unable to determine the shutdown fault current, etc., to achieve reliable Effect of breaking the fault current

Pending Publication Date: 2021-05-04
EATON ELECTRIC INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the existing hybrid DC circuit breakers cannot ensure that the mechanical switch is completely arc-free, and cannot determine when the semiconductor switch is turned on so that the mechanical switch can safely and reliably turn off the fault current

Method used

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Embodiment Construction

[0032] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below through specific embodiments in conjunction with the accompanying drawings.

[0033] figure 1 is a block diagram of a hybrid DC circuit breaker according to a preferred embodiment of the present invention. Such as figure 1 As shown, the hybrid DC circuit breaker 1 includes a mechanical switch 11 connected to a first current branch, a semiconductor switch 13 and a forced resonance injection circuit 14 connected to a second current branch. The forced resonance injection circuit 14 includes a terminal 1461 and a terminal 1462. The terminal 1461 of the forced resonance injection circuit 14 is connected to one end of the semiconductor switch 13, and the other end of the semiconductor switch 13 and the terminal 1462 of the forced resonance injection circuit 14 are connected to two ends of the mechanical switch 11. e...

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Abstract

The invention provides a hybrid DC (direct-current) circuit breaker. The hybrid direct-current circuit breaker comprises a mechanical switch connected to a first current branch; and a semiconductor switch and a forced resonance injection circuit connected to a second current branch, the forced resonance injection circuit comprises a first terminal and a second terminal, the first terminal of the forced resonance injection circuit is connected to one end of the semiconductor switch, and the second terminal and the other end of the semiconductor switch are connected to the two ends of the mechanical switch; when the mechanical switch is switched off, the semiconductor switch is controlled to be switched on, and meanwhile, the forced resonance injection circuit is controlled to inject injection current which is opposite to current in the mechanical switch in direction and gradually increases into the mechanical switch. The current in the mechanical switch is gradually reduced to zero within a predetermined commutation time and the current is commutated from the first current branch to the second current branch. The hybrid direct-current circuit breaker can safely and reliably cut off faults and load current in any direction.

Description

technical field [0001] The invention relates to the field of circuit breakers, in particular to a hybrid direct current circuit breaker. Background technique [0002] Since the DC power supply system lacks a voltage zero crossing point, the DC power supply system has the problem that it is difficult to cut off the fault current. In order to quickly cut off the fault current and make the mechanical switch break without arcing, a hybrid DC circuit breaker is currently proposed, which includes a mechanical switch, a semiconductor switch connected in parallel with the mechanical switch, and a surge arrester (or called a lightning protector, surge protector). device or surge protector). [0003] The basic principle of the hybrid DC circuit breaker is: when a fault current (such as a short-circuit current) occurs in the DC circuit, the mechanical switch is triggered to open. In the process of turning off the mechanical switch, in order to avoid the arc generated during the openi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H3/087H02H3/05
CPCH02H3/05H02H3/087
Inventor M·B·J·莱乌森坎普
Owner EATON ELECTRIC INC
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