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A commutation and breaking method for a DC vacuum switch commutation and breaking device

A vacuum switch and breaking device technology, applied in the direction of emergency power supply protection, etc., can solve the problems such as the difficulty in realizing the bidirectional symmetrical breaking function of the vacuum switch S, and achieve the effects of convenient bidirectional symmetrical breaking, reduced volume, and reduced current change rate

Active Publication Date: 2019-11-05
WUHAN MARINE ELECTRIC PROPULSION RES INST CHINA SHIPBUILDING IND CORP NO 712 INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This solution requires the introduction of an additional diode D, and it is difficult to realize the bidirectional symmetrical breaking function of the vacuum switch S, otherwise it is necessary to introduce additional equipment

Method used

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  • A commutation and breaking method for a DC vacuum switch commutation and breaking device
  • A commutation and breaking method for a DC vacuum switch commutation and breaking device
  • A commutation and breaking method for a DC vacuum switch commutation and breaking device

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Experimental program
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Effect test

Embodiment 1

[0027] When the DC current of the main circuit of the system flows from terminal J1 to terminal J2, during the commutation breaking process, refer to Figure 4 and Figure 5 As shown, the vacuum switch S first breaks off to generate an arc; then the auxiliary switches S1 and S4 are turned on, and the pre-charge capacitor C discharges through the loop formed by the inductor L-auxiliary switch S4-vacuum switch S-auxiliary switch S1 to generate pulse current i C , then the effective commutation current is i com = i C , forcing the current i in the vacuum switch S S Decrease rapidly; at current i S At a certain moment Δt1 near zero, the auxiliary switch S2 is turned on, and the pulse current (discharge current) i C Part of the current i in S2 Flowing through the auxiliary switch S2, the effective commutation current is reduced to i com = i C -i S2 , so as to greatly slow down the current change process near the zero-crossing of the vacuum switch S current; when the vacuum ...

Embodiment 2

[0029] When the DC current of the main circuit of the system flows from terminal J2 to terminal J1, during the commutation breaking process, refer to Figure 6 and Figure 7 As shown, after the vacuum switch S is broken to generate an arc, the auxiliary switches S2 and S3 are turned on, and the precharge capacitor C discharges through the loop formed by the inductance L-auxiliary switch S3-vacuum switch S-auxiliary switch S2 to generate a pulse current i C , then the effective commutation current is i com = i C , forcing the current i in the vacuum switch S S Decrease rapidly; at current i S At a certain moment Δt1 near zero, the auxiliary switch S1 is turned on, and the pulse current (discharge current) i C Part of the current i in S1Flowing through the auxiliary switch S1, the effective commutation current is reduced to i com = i C -i S1 , so as to greatly slow down the current change process before the current of the vacuum switch S crosses zero; when the current of...

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Abstract

The invention discloses a commutation and interruption device of a DC vacuum switch, which comprises a varistor RV and a forced commutation circuit connected in parallel between two terminals J1 and J2 of a vacuum switch S, wherein the forced commutation circuit is composed of a precharge capacitor C, an inductor L and an auxiliary switch in series, and the auxiliary switch comprises S1, S2, S3 and S4; A commutating and interrupting method is also disclosed, A forced current transfer circuit composed of a precharge capacitor C, an inductor L and auxiliary switches S1 to S4 realizes commutationand interruption of a vacuum switch S, in that current transfer process of the vacuum switch S, By flexibly controlling the switching of the auxiliary switches S1, S2, S3 or S4, the current change rate near the zero-crossing current of the vacuum switch S can be effectively reduced, and the recovery voltage near the zero-crossing current of the vacuum switch S can be greatly reduced, so that thereliability of the vacuum switch S for rapidly breaking the large DC current can be remarkably improved.

Description

technical field [0001] The invention belongs to the technical field of power system fault protection, and in particular relates to a commutation and breaking device of a DC vacuum switch and a method for commutating and breaking the same. Background technique [0002] With the vigorous development of DC power transmission and distribution technology in recent years, as the core protection equipment, DC circuit breakers have received extensive attention from related industries at home and abroad. Since the DC current has no natural zero-crossing point, compared with conventional AC breaking, DC breaking is very difficult. The key task that DC breaking technology needs to solve is to quickly create the current zero crossing point, and quickly restore the insulation after the current zero crossing, and withstand the recovery voltage during the breaking process. [0003] The artificial zero-crossing DC circuit breaker uses the reverse high-frequency current provided by the LC c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H1/06
CPCH02H1/06
Inventor 彭振东杨晨光涂煜任志刚李博邹顺朱兆芳骆文平
Owner WUHAN MARINE ELECTRIC PROPULSION RES INST CHINA SHIPBUILDING IND CORP NO 712 INST