CN105743069A - Series resonance zero-loss current limiting device - Google Patents
Series resonance zero-loss current limiting device Download PDFInfo
- Publication number
- CN105743069A CN105743069A CN201610248992.9A CN201610248992A CN105743069A CN 105743069 A CN105743069 A CN 105743069A CN 201610248992 A CN201610248992 A CN 201610248992A CN 105743069 A CN105743069 A CN 105743069A
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- Prior art keywords
- resonant capacitor
- current
- series resonance
- limiting
- current limiting
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/22—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/22—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices
- H02H7/226—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices for wires or cables, e.g. heating wires
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
- H02H9/021—Current limitation using saturable reactors
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention relates to a series resonance zero-loss current limiting device, which comprises a current limiting reactor, a resonant capacitor, a discharge damping protection system and an intelligent protection control system, wherein the current limiting reactor is arranged in a power distribution cabinet; the resonant capacitor is connected with the reactor in series; the resonant capacitor and the current limiting reactor form series resonance; the discharge damping protection system is connected with the resonant capacitor in parallel and is used for releasing electric energy; and the intelligent protection control system is connected with the resonant capacitor and is used for preventing the resonant capacitor from being damaged. The series resonance zero-loss current limiting device is simple in structure, convenient to use, safe and reliable, can effectively limit the strength of a short-circuit current, greatly reduces the impact of the short-circuit current to electric equipment, and can achieve zero loss of the current limiting reactor when ensuring the voltage of a user terminal.
Description
Technical field
The present invention relates to electric power system power distribution equipment current limiting technique field, be specifically related to a kind of series resonance zero loss current-limiting apparatus.
Background technology
Along with the sharp increase of expanding economy and electric load, the increase of net capacity, the short circuit current constantly increased is increasing to the impact of power system electrical equipment；Meanwhile, the connecting-disconnecting function of existing chopper is difficult to meet cut-off huge short circuit current.Therefore for solving this great difficult problem, the mode that current-limiting reactor is concatenated in loop is widely used in power system electrical power trans mission/distribution system.Though current-limiting reactor series connection in the loop can limiting short-circuit current intensity, reduce short circuit current to the impact of electrical equipment in power system, and maintain busbar voltage, it is to avoid the further expansion of short trouble.But series connection current-limiting reactor has a lot of weak point, first, produces the financial burden that huge reactive loss also cause the user is very big in current-limiting reactor series loop；Secondly, when choosing the reactance value of current-limiting reactor, after often there is the requirement meeting limiting short-circuit current, the contradiction of user side brownout under rated current.In the long distance delivery process of power system transmission and distribution network, transmission line of electricity also can produce induction reactance, the substantially equivalent reactor defined in a kind of stealth, potential concatenation user load loop, causes user side voltage to reduce equally, has again bigger reactive loss simultaneously.
Summary of the invention
It is an object of the invention to provide a kind of series resonance zero loss current-limiting apparatus, can the intensity of effective limiting short-circuit current, be greatly reduced the short circuit current impact to electrical equipment, while guarantee user side voltage, zero loss of current-limiting reactor can be realized again.
For achieving the above object; present invention employs techniques below scheme: include the current-limiting reactor being arranged in power distribution cabinet; it is in series with described current-limiting reactor, for constituting the resonant capacitor of series resonance with described current-limiting reactor; be in parallel with described resonant capacitor, for discharge its electric energy electric discharge damp protection system, be connected with described resonant capacitor, for protect resonant capacitor to be not damaged by intelligent protection control system.
Described electric discharge damping protection system includes current limliting antivibrator and znr; the input of described current limliting antivibrator is connected with the end of incoming cables of described resonant capacitor, and its outfan is connected with the leading-out terminal of described resonant capacitor by znr.
Described intelligent protection system includes the high-speed eddy switch being connected in parallel on resonant capacitor two ends, and described high-speed eddy switch controls it by the controller being arranged in power distribution cabinet and cut-offs.
Described intelligent protection system also includes bidirectional triode thyristor, and described bidirectional triode thyristor is connected in parallel on the two ends of resonant capacitor.
Described current limliting antivibrator is in parallel is formed by inductance L and resistance R.
Described high-speed eddy switch is vacuum extinction formula chopper.
As shown from the above technical solution, present configuration is simple, esy to use, safe and reliable, very big beneficial effect is had relative to directly concatenating current-limiting reactor in the loop, one, in load circuit, the current-limiting reactor of concatenation and this resonant capacitor are in series so that under normal power supply running status, no matter how load changes, power frequency current-limiting reactor is constituted series resonance with resonant capacitor, makes user's load terminal voltage equal to busbar voltage.They are two years old, current-limiting reactor and resonant capacitor constitute series resonance, make the reactive loss of current-limiting reactor consumption be provided by resonant capacitor completely, will not any financial burden of cause the user, under realizing specified running status, it is achieved the economic aim of current-limiting reactor zero loss.Its three, when power system is short-circuited fault, controller judges short trouble by fast algorithm, sending combined floodgate order to high-speed eddy switch immediately, and high-speed eddy switch can close a floodgate rapidly within 2 milliseconds, quickly puts into current-limiting reactor limiting short-circuit current；Detect that resonant capacitor both end voltage exceedes resonant capacitor normal operating voltage at the bidirectional triode thyristor at resonant capacitor two ends in parallel simultaneously, bidirectional triode thyristor turns within 200 microseconds, thus short circuit resonant capacitor, quickly put into current-limiting reactor limiting short-circuit current.The duplicate protection realized resonant capacitor is switched by bidirectional triode thyristor and high-speed eddy; while avoiding resonant capacitance because of excessive pressure damages; guarantee that current-limiting reactor can the intensity of effective limiting short-circuit current; reduce short circuit current to the impact of electrical equipment in power system; and maintenance busbar voltage, it is to avoid the further expansion of short trouble.Its four, electric energy when discharge prevention system big electric current occurs for circuit, after resonant capacitor is shorted, in release resonant capacitor, it is ensured that resonant capacitor can permanently effective safe operation.
Accompanying drawing explanation
Fig. 1 is the electrical schematic diagram of the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention will be further described:
As shown in Figure 1; the series resonance zero loss current-limiting apparatus of the present embodiment; including the current-limiting reactor 1 being arranged in power distribution cabinet; it is in series with current-limiting reactor 1, for constituting the resonant capacitor 3 of series resonance with current-limiting reactor 1; be in parallel with resonant capacitor 3, for discharge its electric energy electric discharge damp protection system, be connected with resonant capacitor 3, for protect resonant capacitor 3 to be not damaged by intelligent protection control system.
Electric discharge damping protection system includes current limliting antivibrator 6 and znr 4, and the input of current limliting antivibrator 6 is connected with the end of incoming cables of resonant capacitor 3, and its outfan is connected with the leading-out terminal of resonant capacitor 3 by znr 4.In the present embodiment, current limliting antivibrator 6 is in parallel is formed by inductance L and resistance R.This current limliting antivibrator 6, is used for limiting electric energy release dash current after resonant capacitor 3 short circuit is protected, it is prevented that resonant capacitor 3 damages owing to crossing stream.This znr 4; can after resonant capacitor short circuit be protected; absorb rapidly the electric energy of resonant capacitor release, it is ensured that the terminal voltage of resonant capacitor 3 is controlled in load rated safety range of operation, it is ensured that the safe operation that resonant capacitor 3 can be permanently effective.So resonant capacitor 3 both end voltage can be limited in a relatively low level, the capacity of such resonant capacitor 3 can reduce greatly, its cost can be greatly reduced naturally, the volume of equipment obtains effective control simultaneously, complete equipment cost can be greatly reduced, make current-limiting reactor 1 can be widely used in power system.
Intelligent protection system includes the high-speed eddy switch 5 being connected in parallel on resonant capacitor 3 two ends, and high-speed eddy switch 5 controls it by the controller being arranged in power distribution cabinet and cut-offs.When outlet short trouble in circuit, controller controls high-speed eddy switch immediately and closes a floodgate, thus preventing resonant capacitor 3 from damaging because of overvoltage, ensures the intensity of limiting short-circuit current in the concatenation loop that current-limiting reactor 1 can be sufficiently fast simultaneously.This example high speed eddy current switch drives for eddy current, vacuum interrupter arc extinguishing chopper.
For the intensity of the safety of the raising resonant capacitor that improves and the short circuit current of limiting circuit fault, in the present embodiment, intelligent protection controls system and also includes bidirectional triode thyristor 2, and this bidirectional triode thyristor 2 is connected in parallel on resonant capacitor 3 two ends.
Operation principle is as follows: when be short-circuited fault time, the terminal voltage of resonant capacitor 3 exceed can two-way control silicon 2 conducting voltage time, this bidirectional triode thyristor 2 turns on immediately, thus resonant capacitor 3 short circuit, prevent resonant capacitor 3 from damaging because of overvoltage, ensure the intensity of limiting short-circuit current in the concatenation loop that current-limiting reactor 1 can be sufficiently fast simultaneously；After resonant capacitor 3 is protected, resonant capacitor 3 is discharged by electric discharge damping protection system immediately, the electric energy in release resonant capacitor 3；When the electric current that bidirectional triode thyristor 2 passes through is less than freewheel current, bidirectional triode thyristor 2 disconnects immediately, now high-speed eddy switch 5 combined floodgate, and this resonant capacitor 3 is by high-speed eddy switch protection；After short trouble excises, when line current returns normal value, controller sends separating brake order, high-speed eddy switchs 5 separating brakes, make resonant capacitor 3 put into circuit to run, constitute series resonance with current-limiting reactor 1, while both ensureing user side voltage, zero loss of current-limiting reactor 1 can be realized again.
Embodiment described above is only that the preferred embodiment of the present invention is described; not the scope of the present invention is defined; under the premise designing spirit without departing from the present invention; various deformation that technical scheme is made by those of ordinary skill in the art and improvement, all should fall in the protection domain that claims of the present invention is determined.
Claims (6)
1. a series resonance zero loss current-limiting apparatus; it is characterized in that: include the current-limiting reactor (1) being arranged in power distribution cabinet; it is in series with described current-limiting reactor (1), for constituting the resonant capacitor (3) of series resonance with described reactor (1); be in parallel with described resonant capacitor (3), for discharge its electric energy electric discharge damp protection system, be connected with described resonant capacitor (3), for protect resonant capacitor (3) to be not damaged by intelligent protection control system.
2. series resonance zero loss current-limiting apparatus according to claim 1; it is characterized in that: described electric discharge damping protection system includes current limliting antivibrator (6) and znr (4); the input of described current limliting antivibrator (6) is connected with the end of incoming cables of described resonant capacitor (3), and its outfan is connected with the leading-out terminal of described resonant capacitor (3) by znr (4).
3. series resonance zero loss current-limiting apparatus according to claim 1; it is characterized in that: described intelligent protection system includes being connected in parallel on high-speed eddy switch (5) at resonant capacitor (3) two ends, described high-speed eddy switch (5) controls it by the controller being arranged in power distribution cabinet and cut-offs.
4. series resonance zero loss current-limiting apparatus according to claim 1, it is characterised in that: described intelligent protection system also includes bidirectional triode thyristor (2), and described bidirectional triode thyristor (2) is connected in parallel on the two ends of resonant capacitor (3).
5. series resonance zero loss current-limiting apparatus according to claim 2, it is characterised in that: described current limliting antivibrator (6) is in parallel is formed by inductance L and resistance R.
6. series resonance zero loss current-limiting apparatus according to claim 3, it is characterised in that: described high-speed eddy switch (5) is vacuum extinction formula chopper.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610248992.9A CN105743069A (en) | 2016-04-20 | 2016-04-20 | Series resonance zero-loss current limiting device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610248992.9A CN105743069A (en) | 2016-04-20 | 2016-04-20 | Series resonance zero-loss current limiting device |
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| CN105743069A true CN105743069A (en) | 2016-07-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610248992.9A Pending CN105743069A (en) | 2016-04-20 | 2016-04-20 | Series resonance zero-loss current limiting device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106786434A (en) * | 2016-11-16 | 2017-05-31 | 合肥普望电子有限责任公司 | A kind of superconductive failure current limiter |
| CN106849038A (en) * | 2017-03-02 | 2017-06-13 | 安徽伊格瑞德电气设备有限公司 | A kind of self-shield current-limiting apparatus based on Fast Switch with Large Capacity FSR |
| CN106921167A (en) * | 2017-03-02 | 2017-07-04 | 安徽伊格瑞德电气设备有限公司 | A kind of self-shield series compensation device based on high energy type fuse FU |
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| US20120218676A1 (en) * | 2009-10-13 | 2012-08-30 | Georgios Demetriades | Hybrid Circuit Breaker |
| CN202503277U (en) * | 2012-03-22 | 2012-10-24 | 上海市电力公司 | Short-circuit current limiting device |
| CN202550512U (en) * | 2012-03-29 | 2012-11-21 | 上海市电力公司 | Fault current limiting device for supergrid |
| CN202550511U (en) * | 2012-03-29 | 2012-11-21 | 上海市电力公司 | Fault current limiter (FCL) device for outlet of line of transformer substation |
| CN104134979A (en) * | 2014-07-18 | 2014-11-05 | 中国科学院电工研究所 | Resonant superconducting short-circuit fault current limiter |
-
2016
- 2016-04-20 CN CN201610248992.9A patent/CN105743069A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120218676A1 (en) * | 2009-10-13 | 2012-08-30 | Georgios Demetriades | Hybrid Circuit Breaker |
| CN202503277U (en) * | 2012-03-22 | 2012-10-24 | 上海市电力公司 | Short-circuit current limiting device |
| CN202550512U (en) * | 2012-03-29 | 2012-11-21 | 上海市电力公司 | Fault current limiting device for supergrid |
| CN202550511U (en) * | 2012-03-29 | 2012-11-21 | 上海市电力公司 | Fault current limiter (FCL) device for outlet of line of transformer substation |
| CN104134979A (en) * | 2014-07-18 | 2014-11-05 | 中国科学院电工研究所 | Resonant superconducting short-circuit fault current limiter |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106786434A (en) * | 2016-11-16 | 2017-05-31 | 合肥普望电子有限责任公司 | A kind of superconductive failure current limiter |
| CN106849038A (en) * | 2017-03-02 | 2017-06-13 | 安徽伊格瑞德电气设备有限公司 | A kind of self-shield current-limiting apparatus based on Fast Switch with Large Capacity FSR |
| CN106921167A (en) * | 2017-03-02 | 2017-07-04 | 安徽伊格瑞德电气设备有限公司 | A kind of self-shield series compensation device based on high energy type fuse FU |
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Application publication date: 20160706 |
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