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Bridge type short circuit fault current limiter with single self-on-off switching tube

A short-circuit fault and self-shutoff technology, which is applied to emergency protection circuit devices, circuit devices, and emergency protection circuit devices for limiting overcurrent/overvoltage, and can solve problems such as high cost, complex control circuits, and small DC inductance. problem, to achieve the effect of improving reliability, simplifying system structure and control method, and reducing device cost

Inactive Publication Date: 2007-03-21
NANJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The utility model patent "Short-circuit fault current limiter based on self-shutoff switching device" (patent application number: 200520075417.0) proposes a bridge-type short-circuit fault current limiter based on self-shutoff device, which has small DC inductance and fast dynamic characteristics and other significant advantages, but all the switch tubes in the bridge are composed of self-turn-off devices, which not only has high cost, but also needs to provide a set of isolated drive circuits for each self-turn-off device, and the control circuit is complex

Method used

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  • Bridge type short circuit fault current limiter with single self-on-off switching tube
  • Bridge type short circuit fault current limiter with single self-on-off switching tube
  • Bridge type short circuit fault current limiter with single self-on-off switching tube

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Embodiment 1

[0018] Embodiment 1. A bridge-type short-circuit fault current limiter with a single self-turn-off switching tube adopts the single-phase structure shown in FIG. 1 . It consists of a rectifier bridge composed of diodes D1-D4, a self-turn-off switch tube T1, a DC reactor L1, a freewheeling diode D5 and a current-limiting inductor L2. Among them, the diode rectifier bridge is composed of diodes D1~D4, the DC reactor L1 is connected in parallel with the freewheeling diode D5 and then connected in series with the self-shutoff switch T1, the cathode of the freewheeling diode D5 and one end of the DC reactor L1 are connected to the self-shutdown The emitter (or source) of the switching tube T1 is connected, the collector (or drain) of the self-turn-off switching tube T1 is connected to the common cathode of D1 and D2 in the rectifier bridge, the anode of the freewheeling diode D5, the DC reactor L1 The other end is connected with the common anodes of diodes D3 and D4 in the rectifie...

Embodiment 2

[0020] Embodiment 2. A bridge-type short-circuit fault current limiter with a single self-turn-off switching tube adopts a single-phase structure with a step-down transformer as shown in FIG. 2 and is used in a high-voltage system. It consists of a step-down transformer TR1, a rectifier bridge composed of diodes D1-D4, a self-turn-off switch tube T1, a DC reactor L1, a freewheeling diode D5 and a current-limiting reactor L2. Among them, the diode rectifier bridge is composed of diodes D1-D4, the DC reactor L1 is connected in parallel with the freewheeling diode D5 and connected in series with the self-shutoff switch T1, the cathode of the freewheeling diode D5 and one end of the DC reactor L1 are connected to the self-shutdown The emitter (or source) of the switching tube T1 is connected, the collector (or drain) of the self-turn-off switching tube T1 is connected to the common cathode of D1 and D2 in the rectifier bridge, the anode of the freewheeling diode D5, the DC reactor ...

Embodiment 3

[0021] Embodiment 3. A bridge-type short-circuit fault current limiter with a single self-shutoff switch adopts the structure shown in FIG. 3 and is used in a three-phase ungrounded system. It consists of a diode rectifier bridge composed of D1-D6, a self-turn-off switch tube T1, a DC reactor L1, a freewheeling diode D7, and a current-limiting reactor L2-L4. Among them, the cathodes of diodes D1, D2, and D3 are connected together, the anodes of D4, D5, and D6 are connected together, the DC reactor L1 and the freewheeling diode D7 are connected in parallel and connected in series with the self-turn-off switch T1, and the freewheeling diode D7 The cathode and one end of the DC reactor L1 are connected to the emitter (or source) of the self-turn-off switch tube T1, and the collector (or drain) of the self-turn-off switch tube T1 is connected to the common of D1, D2, and D3 in the rectifier bridge The cathode, the anode of the freewheeling diode D7, the other end of the DC reactor...

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Abstract

This invention discloses a bridge short fault current limiter with a single self-switching off switch tube including a diode commutation bridge, a self-shuttering switch tube, a DC reactor, a continuous diode and a current-limit reactor, in which, after the DC reactor and the continuous diode are parallel, they are serial to the self shuttering switch tube, the cathode of the continuous diode is connected to the emitter of the switch tube, the collector of which is connected to the cathode of D1 and D2 of the commutation bridge, the anode of the continuous diode is connected to the anode of diodes D3 and D4 in the commutation bridge, the current limit reactor L2 is connected between two AC input ends of the commutation bridge. This invention also discloses a structure with dropping transformer, non-earth of single and three phases and earth of three phases. The whole system needs one self-shuttering switch only since the bridge circuit is composed of diodes.

Description

technical field [0001] The invention is a device applied to an AC voltage power supply system to limit the short-circuit fault current and its rising rate, and belongs to the technical field of AC flexible power transmission technology. Background technique [0002] As the scale of the power system increases day by day, the value of the short-circuit current also increases, and the harm of the short-circuit fault to the system is also increasing. After detecting the short-circuit fault, the solid-state short-circuit fault current limiter quickly changes the impedance parameters of the fault line to limit the short-circuit current to an allowable level to protect power equipment. It has become one of the key components of the flexible AC transmission system. The utility model patent "Short-circuit fault current limiter based on self-shutoff switching device" (patent application number: 200520075417.0) proposes a bridge-type short-circuit fault current ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H9/02H02H3/08
Inventor 费万民张艳莉
Owner NANJING NORMAL UNIVERSITY