CN201910616U - A single-phase single-tube bridge-type short-circuit current limiter - Google Patents
A single-phase single-tube bridge-type short-circuit current limiter Download PDFInfo
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- CN201910616U CN201910616U CN2011200027970U CN201120002797U CN201910616U CN 201910616 U CN201910616 U CN 201910616U CN 2011200027970 U CN2011200027970 U CN 2011200027970U CN 201120002797 U CN201120002797 U CN 201120002797U CN 201910616 U CN201910616 U CN 201910616U
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Abstract
本实用新型公开了一种单相单管桥式短路限流器，属于交流柔性输电技术的技术领域。该限流器包括由四个二极管组成的整流桥、自关断开关管、直流电感、续流二极管和旁路电感，直流电感和续流二极管并联后与自关断开关管串联，旁路电感的一端和第三个二极管的阴极、第一个二极管的阳极接在一起，其另一端和第四个二极管的阴极、第二个二极管的阳极接在一起，同时在旁路电感的通道中串接一个小电阻。本实用新型的限流器结构简单、易于控制、成本低、可靠性高，而且限流期间的阻性阻抗能有效提高系统的稳定性。
The utility model discloses a single-phase single-tube bridge-type short-circuit current limiter, which belongs to the technical field of AC flexible power transmission technology. The current limiter includes a rectifier bridge composed of four diodes, a self-turn-off switch tube, a DC inductor, a freewheel diode and a bypass inductor. One end of the diode is connected to the cathode of the third diode and the anode of the first diode, and the other end is connected to the cathode of the fourth diode and the anode of the second diode. Connect a small resistor. The current limiter of the utility model has the advantages of simple structure, easy control, low cost and high reliability, and the resistive impedance during the current limiting period can effectively improve the stability of the system.
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.
Chinese patent ZL200610086112.9 discloses a kind of bridge type short circuit fault current-limiting apparatus with single self-on-off switching tube, its principle as shown in Figure 1, among the figure, L1 is a dc inductance, L2 is a by-pass inductor, and D1-D4 forms a bridge circuit, and D5 is a fly-wheel diode, Vs is a supply voltage, and Z1 is a load impedance.Under system's normal condition, the conducting of control self-on-off switching tube, 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, produce electric current, after testing circuit detects the short trouble generation, control on-off switching tube T1 immediately, the electric current among the dc inductance L1 is by the fly-wheel diode afterflow, the rectifier bridge path disconnects, and short circuit current is subjected to the restriction of by-pass inductor L2.Because bridge circuit is made up of diode, whole system only needs a self-on-off switching, and that this flow restricter has is 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 takes place, on-off switching tube T1; bridge circuit and dc inductance L1 log off; short circuit current is born by by-pass inductor L2, and need maintain 3 to 5 times of nominal load current, and keeps a period of time.But during the lasting current limliting of above-mentioned flow restricter after short trouble takes place, transient current absolute value among the L2 is very big, can reach the twice of design load, be 6 to 10 times of rated current, therefore 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, has bigger harm.
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 single-phase single tube bridge-type 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 single-phase single tube bridge-type short circuit current limiter, comprise the rectifier bridge of forming by four diodes, self-on-off switching tube, dc inductance, fly-wheel diode and by-pass inductor, connect with self-on-off switching tube after dc inductance and the fly-wheel diode parallel connection, the negative electrode of one end of by-pass inductor and the 3rd diode, the anode of first diode is connected together, the negative electrode of its other end and the 4th diode, the anode of second diode is connected together, small resistor of serial connection in the passage of by-pass inductor.
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 single-phase single tube bridge-type short circuit current limiter in the prior art.Fig. 2 is the circuit diagram of the single-phase single tube bridge-type of the utility model 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, single-phase single tube bridge-type short circuit current limiter of the present utility model, comprise the rectifier bridge of forming by four diode D1-D4, self-on-off switching tube T1, dc inductance L1, sustained diode 5 and by-pass inductor L2, connect with self-on-off switching tube T1 in dc inductance L1 and sustained diode 5 backs in parallel, the end of the negative electrode of sustained diode 5 and direct current reactor L1 links to each other with the emitter of self-on-off switching tube T1, the collector electrode of self-on-off switching tube T1 meets first diode D1 in the rectifier bridge, the common cathode of second diode D2, the anode of sustained diode 5, the 3rd diode D3 in the other end of direct current reactor L1 and the rectifier bridge, the public anode of the 4th diode D4 is connected together, the negative electrode of the end of by-pass inductor L2 and the 3rd diode D3, the anode of first diode D1 is connected together, the negative electrode of the other end of by-pass inductor L2 and the 4th diode D4, the anode of second diode D2 is connected together.Small resistor R1 of serial connection in the passage of by-pass inductor L2.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, R1 can design according to pulse load, and the power of R1 is very little, can obviously not increase system cost.
Claims (1)
1. single-phase single tube bridge-type short circuit current limiter, comprise the rectifier bridge of forming by four diodes, self-on-off switching tube (T1), dc inductance (L1), fly-wheel diode (D5) and by-pass inductor (L2), connect with self-on-off switching tube (T1) in dc inductance (L1) and fly-wheel diode (D5) back in parallel, the negative electrode of one end of by-pass inductor (L2) and the 3rd diode (D3), the anode of first diode (D1) is connected together, the negative electrode of its other end and the 4th diode (D4), the anode of second diode (D2) is connected together, and it is characterized in that: a serial connection small resistor (R1) in the passage of described by-pass inductor (L2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200027970U CN201910616U (en) | 2011-01-07 | 2011-01-07 | A single-phase single-tube bridge-type short-circuit current limiter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200027970U CN201910616U (en) | 2011-01-07 | 2011-01-07 | A single-phase single-tube bridge-type short-circuit current limiter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201910616U true CN201910616U (en) | 2011-07-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011200027970U Expired - Fee Related CN201910616U (en) | 2011-01-07 | 2011-01-07 | A single-phase single-tube bridge-type short-circuit current limiter |
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| CN (1) | CN201910616U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106160441A (en) * | 2016-07-28 | 2016-11-23 | 东北电力大学 | A kind of protection circuit suppressing output current of converter to suddenly change |
| CN108123427A (en) * | 2018-01-17 | 2018-06-05 | 华北电力大学 | A kind of inductive type bidirectional, dc current limiter topology |
-
2011
- 2011-01-07 CN CN2011200027970U patent/CN201910616U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106160441A (en) * | 2016-07-28 | 2016-11-23 | 东北电力大学 | A kind of protection circuit suppressing output current of converter to suddenly change |
| CN108123427A (en) * | 2018-01-17 | 2018-06-05 | 华北电力大学 | A kind of inductive type bidirectional, dc current limiter topology |
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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: 20110727 Termination date: 20140107 |