CN201918893U - Three-phase semi-controlled bridge type short-circuit current limiter - Google Patents
Three-phase semi-controlled bridge type short-circuit current limiter Download PDFInfo
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- CN201918893U CN201918893U CN2011200055237U CN201120005523U CN201918893U CN 201918893 U CN201918893 U CN 201918893U CN 2011200055237 U CN2011200055237 U CN 2011200055237U CN 201120005523 U CN201120005523 U CN 201120005523U CN 201918893 U CN201918893 U CN 201918893U
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Abstract
The utility model discloses a three-phase semi-controlled bridge type short-circuit current limiter, which belongs to the technical field of alternating-current flexible power transmission and comprises a three-phase four-leg rectifying bridge circuit, a direct-current inductor, a load resistor and three bypass inductors. The three-phase four-leg rectifying bridge circuit consists of six switching tubes capable of automatically switching on and off and two diodes, and a small resistor is respectively serially connected into a channel of each of the three bypass inductors. The three-phase semi-controlled bridge type short-circuit current limiter is simple in structure, easy to be controlled, low in cost and high in reliability, and can effectively improve stability of a system by the aid of resistance and impedance during a current limiting period.
Description
Technical field
The utility model relates to a kind of short-circuit fault of power system flow restricter that is applied to the alternating voltage electric power system, is a kind of device that short-circuit current and climbing thereof are limited, and belongs to the technical field that exchanges the flexible transmission technology.
Background technology
Continuous expansion along with electric power system scale and capacity, the level of short circuit current increases fast, when short circuit current level surpasses the interrupting capacity of circuit breaker, short trouble may cause the badly damaged of main power equipment such as transformer, high voltage switchgear, power cable etc., cause system's instability, even cause the paralysis of system.Short-circuit fault current limiter by the impedance parameter of quick change faulty line, is limited in the level of permission with short circuit current after detecting short trouble and taking place, with the protection power equipment, become one of key element of flexible AC transmitting system.
A kind of principle of bridge type short circuit fault current limiter of the three-phase grounding system that has very much a practical value is (" based on the three-phase grounding system short circuit current limiter and the control method thereof of bridge in midair " as shown in Figure 1, " Electric Power Automation Equipment ", the 27th the 6th phase of volume, the 51-55 page or leaf, 2007), among the figure, L1 is a dc inductance, L2-L4 is a by-pass inductor, and self-on-off switching tube T1-T6 and diode D1, D2 form a three-phase four-arm rectifier bridge.Va, Vb, Vc are three-phase mains voltage, and Z1-Z3 is the threephase load impedance.Under system's normal condition, control self-on-off switching tube T1-T6 conducting, under the stable situation after reactor L1 magnetizes, electric current is the peak value of load current in the inductance L 1, ignore the loss of the on-state voltage drop and the L1 of diode, self-on-off switching tube, current constant among the L1, L1 and bridge circuit both end voltage are zero, and flow restricter has no adverse effects to system.After short trouble takes place, supply voltage is added on the direct current reactor L1 through rectifier bridge, cause the increase of L1 electric current, and in by-pass inductor L2-L4, produce electric current, after testing circuit detected the short trouble generation, the switching tube that is positioned at fault phase brachium pontis was turn-offed in control immediately, and the electric current among the dc inductance L1 is by sustained diode 1 afterflow, the fault phase brachium pontis of rectification bridge circuit disconnects, and short circuit current is subjected to the restriction that fault goes up by-pass inductor mutually.Because three-phase four wire system only uses 6 gate-controlled switches, two diodes and a dc inductance, this flow restricter scheme and other scheme ratio, have simple in structure, be easy to control, low, the reliability advantages of higher of cost.In order to satisfy the selectivity requirement of power system relay protection device; after short trouble took place, the switching tube that fault goes up mutually turn-offed, and short circuit current is born by the by-pass inductor that fault goes up mutually; and need maintain 3 to 5 times of nominal load current, and keep a period of time.But during the lasting current limliting of above-mentioned flow restricter after short trouble takes place, transient current absolute value in the by-pass inductor is very big, can reach the twice of design load, be 6 to 10 times of rated current, under short-circuit condition, system line resistance is very little, and the transient current decay is very slow, this huge transient current can produce a large amount of mechanical force impact and thermal shock to by-pass inductor and circuit, and bigger harm is arranged.
Summary of the invention
The purpose of this utility model is to overcome the defective that exists in the above-mentioned short circuit current limitation technology, a kind of three-phase half controlled bridge formula short circuit current limiter is provided, can accelerate the rate of decay of transient current greatly, reduce the life period of transient current, can improve the fail safe and the reliability of system.
To achieve these goals, the technical solution adopted in the utility model is as follows:
A kind of three-phase half controlled bridge formula short circuit current limiter, comprise by six self-on-off switching tubes and two three-phase four-arm rectification bridge circuit, dc inductance, load impedance and three by-pass inductors that diode is formed, in the passage of described three by-pass inductors, be connected in series a small resistor respectively.
Occluder configurations of the present utility model is simple, be easy to control, cost is low, reliability is high, and the current-limiting inductance path only has electric current to pass through in the extremely short time of short trouble current limliting, can not increase the power loss of system under normal operating condition.The utility model makes the transient current rate of decay accelerate by very little resistance of series connection in the by-pass inductor path, and the resistive impedance during the current limliting can effectively improve the stability of system.
Description of drawings
Fig. 1 is the circuit diagram of a kind of three-phase half controlled bridge formula short circuit current limiter in the prior art.
Fig. 2 is the circuit diagram of the utility model three-phase half controlled bridge formula short circuit current limiter.
Embodiment
Below in conjunction with drawings and Examples, the utility model is described in further details.
As shown in Figure 2, one of the negative electrode of the negative electrode of first and third, five self-on-off switching tube T1, T3, T5, the first diode D1 and dc inductance L1 terminate at together; The second, the other end of the anode of the anode of four, six self-on-off switching tube T2, T4, T6, the second diode D2 and dc inductance L1 is connected together; The end of the negative electrode of the anode of the first self-on-off switching tube T1, the second self-on-off switching tube T2, A phase power supply common port and the first series connection small resistor R1 connects together; The end of the negative electrode of the anode of the 3rd self-on-off switching tube T3, four selfs on-off switching tube T4, B phase power supply common port and the second series connection small resistor R2 connects together; The end of the negative electrode of the anode of the 5th self-on-off switching tube T5, the 6th self-on-off switching tube T6, C phase power supply common port and the 3rd series connection small resistor R3 connects together; Negative electrode and the earth point of the end of first, second and third by-pass inductor L2, L3, L4 and the anode of the first diode D1, the second diode D2 connect together; The other end of the other end of the first by-pass inductor L2 and the first series connection small resistor R1 is connected together; The other end of the other end of the second by-pass inductor L3 and the second series connection small resistor R2 is connected together; The other end of the other end of the 3rd by-pass inductor L4 and the 3rd series connection small resistor R3 is connected together.Because according to the requirement of relay protection of power system, only there is the extremely short time in the short circuit current under the restriction, resistance R 1, R2, R3 can design according to pulse load, so power is very little, can obviously not increase system cost.
Claims (1)
1. three-phase half controlled bridge formula short circuit current limiter, comprise by six self-on-off switching tubes and two three-phase four-arm rectification bridge circuit, dc inductance (L1), load impedance and three by-pass inductors (L2, L3, L4) that diode is formed, it is characterized in that: in the passage of described three by-pass inductors, be connected in series a small resistor respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200055237U CN201918893U (en) | 2011-01-10 | 2011-01-10 | Three-phase semi-controlled bridge type short-circuit current limiter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200055237U CN201918893U (en) | 2011-01-10 | 2011-01-10 | Three-phase semi-controlled bridge type short-circuit current limiter |
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| Publication Number | Publication Date |
|---|---|
| CN201918893U true CN201918893U (en) | 2011-08-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011200055237U Expired - Fee Related CN201918893U (en) | 2011-01-10 | 2011-01-10 | Three-phase semi-controlled bridge type short-circuit current limiter |
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| CN (1) | CN201918893U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112187020A (en) * | 2020-09-27 | 2021-01-05 | 申彦峰 | Switching semiconductor device parallel circuit and control method thereof |
-
2011
- 2011-01-10 CN CN2011200055237U patent/CN201918893U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112187020A (en) * | 2020-09-27 | 2021-01-05 | 申彦峰 | Switching semiconductor device parallel circuit and control method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110803 Termination date: 20140110 |