CN106786442A - A kind of LC series resonances current-limiting apparatus - Google Patents
A kind of LC series resonances current-limiting apparatus Download PDFInfo
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- CN106786442A CN106786442A CN201611265550.1A CN201611265550A CN106786442A CN 106786442 A CN106786442 A CN 106786442A CN 201611265550 A CN201611265550 A CN 201611265550A CN 106786442 A CN106786442 A CN 106786442A
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- current
- resonant capacitor
- isolation switch
- leading
- out terminal
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Classifications
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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
- H02H9/028—Current limitation by detuning a series resonant circuit
Abstract
The present invention relates to a kind of LC series resonances current-limiting apparatus, the electric discharge damper RL connected including resonant capacitor C and with resonant capacitor C, the end of incoming cables of the electric discharge damper RL is connected through isolation switch G1 with the end of incoming cables of power distribution cabinet, the leading-out terminal of resonant capacitor C is successively through current-limiting reactor L, isolation switch G2 is connected with the leading-out terminal of power distribution cabinet, one end of isolation switch G3 is connected with the end of incoming cables of isolation switch G1, the other end of isolation switch G3 is connected with the leading-out terminal of isolation switch G2, the resonant capacitor C is parallel with intelligent protection system with the two ends of electric discharge damper RL.Line security reliability of the present invention, action rapid sensitive, occur to put into current-limiting reactor L in 200us in short circuit, can effective limiting short-circuit current intensity, greatly reduce impact of the short circuit current to electrical equipment, the reliability and security of power supply are improved, while avoiding because interruption maintenance brings economic loss.
Description
Technical field
The present invention relates to electric power system power distribution equipment current limiting technique field, and in particular to a kind of LC series resonances current limliting dress
Put.
Background technology
With expanding economy and the sharp increase of electric load, the increase of net capacity, the short circuit current pair for constantly increasing
The impact of power system electrical equipment is increasing；Meanwhile, the connecting-disconnecting function of existing breaker be difficult to satisfaction cut-off it is huge
Short circuit current.Therefore to solve this great difficult problem, the mode that current-limiting reactor is concatenated in loop is widely used in power train
In 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 electric power
The impact of electrical equipment in system, and maintain busbar voltage, it is to avoid the further expansion of short trouble.But series connection current-limiting reactor
Device but has many weak points, first, produces huge reactive loss also to be caused very to user in current-limiting reactor series loop
Big financial burden；Secondly, when the reactance value of current-limiting reactor is chosen, often there is the requirement for meeting limiting short-circuit current
Afterwards, under rated current user terminal brownout contradiction.During the long distance delivery of power system transmission and distribution network, transmission line of electricity
Also induction reactance can be produced, the reactor in a kind of stealthy, potential concatenation user load loop has substantially equally been formd, equally
The reduction of user terminal voltage is caused, while there is larger reactive loss again.
The content of the invention
It is safe and reliable it is an object of the invention to provide a kind of LC series resonances current-limiting apparatus, rapid sensitive is acted, can have
The intensity of limiting short-circuit current is imitated, impact of the short circuit current to electrical equipment is greatly reduced, stability, the reliability of system is improve
Property and security, while avoiding because interruption maintenance brings economic loss.
To achieve the above object, present invention employs following technical scheme：
A kind of LC series resonances current-limiting apparatus, including the resonant capacitor C and electric discharge damper RL that is connected with resonant capacitor C,
The end of incoming cables of the electric discharge damper RL is connected through isolation switch G1 with the end of incoming cables with power distribution cabinet, the outlet of resonant capacitor C
End is connected through current-limiting reactor L, isolation switch G2 with the leading-out terminal of power distribution cabinet successively, one end of isolation switch G3 and isolation switch
The end of incoming cables of G1 is connected, and the other end of isolation switch G3 is connected with the leading-out terminal of isolation switch G2, the resonant capacitor C with put
The two ends of electrical deoscillator RL are parallel with for protecting resonant capacitor C, and the intelligence for preventing resonant capacitor C from being damaged by overvoltage is protected
Protecting system.
The intelligent protection system includes that the input of bidirectional triode thyristor SCR, the bidirectional triode thyristor SCR and electric discharge are damped
The end of incoming cables of device RL is connected, and its output end is connected with the leading-out terminal of resonant capacitor C.
The intelligent protection system includes that high-speed eddy switchs K0, and one end of the high-speed eddy switch K0 damps with electric discharge
The end of incoming cables of device RL is connected, and its other end is connected with the leading-out terminal of resonant capacitor C.
The current limliting damper RL is in parallel and is constituted by inductance L and resistance R, the end of incoming cables of the current limliting damper RL with every
Leading-out terminal from disconnecting link G1 is connected, and its leading-out terminal is connected with the end of incoming cables of resonant capacitor C.
The high-speed eddy switch K0 is vacuum extinction formula breaker.
As shown from the above technical solution, circuit structure of the present invention is safe and reliable, act rapid sensitive, relative to directly return
Current-limiting reactor is concatenated in road very big beneficial effect, first, the current-limiting reactor L concatenated in load circuit and resonance electricity
Container C is in series, and current-limiting reactor L and resonant capacitor C constitutes series resonance, the reactive loss for consuming current-limiting reactor L
There is provided by resonant capacitor C completely, any financial burden will not be caused to user, in the case where specified running status is realized, realized
The economic aim of the losses of current-limiting reactor L zero.Second, current-limiting reactor L and resonant capacitor C constitutes series resonance so that
Under normal power supply running status, no matter load and how to change, current-limiting reactor L and resonant capacitor C constitutes string for power frequency
Connection resonance, makes user's load terminal voltage be equal to busbar voltage.Third, when power system is short-circuited failure, being associated in resonance electricity
The bidirectional triode thyristor SCR at container C two ends detects resonant capacitor C both end voltages more than resonant capacitor C normal operating voltages,
Bidirectional triode thyristor SCR is turned within 200us, so that short circuit resonant capacitor C, quick input current-limiting reactor L limitation short circuits
The intensity of electric current, controller judges short trouble by fast algorithm in device, sends conjunction to high-speed eddy switch K0 immediately
Lock order, high-speed eddy switch K0 can rapidly close a floodgate within 2 milliseconds.K0 is switched by bidirectional triode thyristor SCR and high-speed eddy
The duplicate protection to resonant capacitor C is realized, while avoiding resonant capacitance C because of excessive pressure damages, it is ensured that current-limiting reactor L energy
The intensity of effective limiting short-circuit current, reduces impact of the short circuit current to electrical equipment in power system, and maintain bus electricity
Pressure, it is to avoid the further expansion of short trouble.Fourth, when current limliting damper RL high current occurs for circuit, resonant capacitor C
After being shorted, the electric energy in resonant capacitor C is discharged, it is ensured that the safe operation that resonant capacitor C can be permanently effective.Fifth, logical
Cross isolation switch G1, G2, G3 and realize service without power-off, reduce the power failure range of maintenance repair and trouble hunting, greatly improve confession
The reliability and security of electricity, while avoiding because interruption maintenance brings economic loss.
Brief description of the drawings
Fig. 1 is electrical schematic diagram of the invention.
Specific embodiment
The present invention will be further described below in conjunction with the accompanying drawings：
As shown in figure 1, the LC series resonance current-limiting apparatus of the present embodiment, including resonant capacitor C and connected with resonant capacitor C
Electric discharge damper RL, resonant capacitor C, for current-limiting reactor L constitute series resonance, realize that current-limiting reactor L is normal
Zero is lost during operation.The intensity of the short circuit current that current-limiting reactor L is used in limiting circuit, greatly reduces short circuit current to electric
The impact of equipment.The end of incoming cables of electric discharge damper RL is connected through isolation switch G1 with the end of incoming cables with power distribution cabinet, resonant capacitor C
Leading-out terminal be connected with the leading-out terminal of power distribution cabinet through current-limiting reactor L, isolation switch G2 successively, one end of isolation switch G3 with every
From disconnecting link G1 end of incoming cables be connected, the other end of isolation switch G3 is connected with the leading-out terminal of isolation switch G2, resonant capacitor C and
The two ends of electric discharge damper RL are parallel with for protecting resonant capacitor C, the intelligence for preventing resonant capacitor C from being damaged by overvoltage
Protection system.
The intelligent protection system of the present embodiment includes bidirectional triode thyristor SCR, and input and the electric discharge of bidirectional triode thyristor SCR hinder
The end of incoming cables of Buddhist nun's device RL is connected, and its output end is connected with the leading-out terminal of resonant capacitor C.Intelligent protection system includes vacuum extinction
One end of formula breaker K0, vacuum extinction formula breaker K0 are connected with the end of incoming cables of electric discharge damper RL, its other end and resonance
The leading-out terminal of capacitor C is connected.
The current limliting damper RL of the present embodiment is in parallel and is constituted by inductance L and resistance R, the end of incoming cables of current limliting damper RL with
The leading-out terminal of isolation switch G1 is connected, and its leading-out terminal is connected with the end of incoming cables of resonant capacitor C, and current limliting damper RL is used for humorous
Its electric energy is discharged after the capacitor C short circuits that shake protection.Isolation switch G1, G2, G3 are connected with the operating mechanism in power distribution cabinet
Connect, cut-off by manually controlling it, the isolation switch G1, G2, G3 realize component in interruption maintenance or more changing device, carry significantly
The reliability and security of height power supply, while avoiding because interruption maintenance brings economic loss.
Operation principle is as follows：The current-limiting reactor L and resonant capacitor C structures concatenated during normal operation, in load circuit
Into series resonance, the reactive loss for consuming current-limiting reactor L is provided by resonant capacitor C completely, will not cause to appoint to user
What financial burden, realizes the economic aim of the losses of current-limiting reactor L zero.Current-limiting reactor L is constituted with resonant capacitor C and connected
No matter resonance so that under normal power supply running status, load and how to change, current-limiting reactor L and resonance electricity for power frequency
Container C constitutes series resonance, user's load terminal voltage is equal to busbar voltage.
When be short-circuited failure when, the terminal voltage of resonant capacitor C exceed can two-way control silicon SCR conducting voltages when, this pair
To controllable silicon SCR in 200us resonant capacitor C short circuits, preventing resonant capacitor C from being damaged because of overvoltage, while guarantee
Current-limiting reactor L can be sufficiently fast concatenation loop in limiting short-circuit current intensity, in device controller pass through fast algorithm
Judge short trouble, send combined floodgate order to high-speed eddy switch K0 immediately, high-speed eddy switch K0 can be fast within 2 milliseconds
Speed is closed a floodgate；After resonant capacitor C is protected, current limliting damper RL discharges resonant capacitor C immediately, discharges resonant capacitor
Electric energy in C；When the electric current that bidirectional triode thyristor SCR passes through is less than freewheel current, bidirectional triode thyristor SCR disconnects immediately, now
High-speed eddy switch K0 is in "on" position, and resonant capacitor C is protected by high-speed eddy switch K0；When short trouble excision
Afterwards, when line current returns to normal value, controller sends separating brake order, and high-speed eddy switch separating brake C throws resonant capacitor C
Enter circuit operation, series resonance is constituted with current-limiting reactor L, while user's terminal voltage is both ensured, current limliting can be realized again
Zero loss of reactor.Cross isolation switch and realize service without power-off, reduce the power failure range of maintenance repair and trouble hunting, significantly
The reliability and security of power supply are improved, while avoiding because interruption maintenance brings economic loss.
Embodiment described above is only that the preferred embodiment of the present invention is described, not to model of the invention
Enclose and be defined, on the premise of design spirit of the present invention is not departed from, those of ordinary skill in the art are to technical side of the invention
Various modifications and improvement that case is made, all should fall into the protection domain of claims of the present invention determination.
Claims (5)
1. a kind of LC series resonances current-limiting apparatus, it is characterised in that：Connected including resonant capacitor C and with resonant capacitor C
Electric discharge damper RL, the end of incoming cables of the electric discharge damper RL is connected through isolation switch G1 with the end of incoming cables with power distribution cabinet, resonance
The leading-out terminal of capacitor C is connected through current-limiting reactor L, isolation switch G2 with the leading-out terminal of power distribution cabinet successively, isolation switch G3's
One end is connected with the end of incoming cables of isolation switch G1, and the other end of isolation switch G3 is connected with the leading-out terminal of isolation switch G2, described
Resonant capacitor C is parallel with for protecting resonant capacitor C with the two ends of electric discharge damper RL, prevents resonant capacitor C because of mistake
The intelligent protection system pressed and damage.
2. LC series resonances current-limiting apparatus according to claim 1, it is characterised in that：The intelligent protection system includes double
To controllable silicon SCR, the input of the bidirectional triode thyristor SCR is connected with the end of incoming cables of electric discharge damper RL, its output end with it is humorous
Shake capacitor C leading-out terminal be connected.
3. LC series resonances current-limiting apparatus according to claim 1, it is characterised in that：The intelligent protection system includes height
Speed vortex switch K0, one end of high-speed eddy switch K0 is connected with the end of incoming cables of the damper RL that discharges, its other end with it is humorous
Shake capacitor C leading-out terminal be connected.
4. LC series resonances current-limiting apparatus according to claim 1, it is characterised in that：The current limliting damper RL is by inductance
L and resistance R are in parallel composition, and the end of incoming cables of the current limliting damper RL is connected with the leading-out terminal of isolation switch G1, its leading-out terminal
End of incoming cables with resonant capacitor C is connected.
5. LC series resonances current-limiting apparatus according to claim 3, it is characterised in that：The high-speed eddy switch K0 is true
Empty arc extinguishing type breaker.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611265550.1A CN106786442A (en) | 2016-12-30 | 2016-12-30 | A kind of LC series resonances current-limiting apparatus |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611265550.1A CN106786442A (en) | 2016-12-30 | 2016-12-30 | A kind of LC series resonances current-limiting apparatus |
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| CN106786442A true CN106786442A (en) | 2017-05-31 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201611265550.1A Pending CN106786442A (en) | 2016-12-30 | 2016-12-30 | A kind of LC series resonances current-limiting apparatus |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107394756A (en) * | 2017-09-06 | 2017-11-24 | 安徽徽电科技股份有限公司 | A kind of direct current based on LC concussions cut-offs system |
| CN108206527A (en) * | 2018-02-05 | 2018-06-26 | 安徽徽电科技股份有限公司 | A kind of series compensation system by SCR quick-switchings |
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| US5500690A (en) * | 1993-09-29 | 1996-03-19 | U.S. Philips Corporation | Television apparatus provided with a device for selecting different sources |
| CN105119299A (en) * | 2015-08-26 | 2015-12-02 | 安徽徽电科技股份有限公司 | Middle and high voltage power grid distributed series compensation system |
| CN105790242A (en) * | 2014-12-17 | 2016-07-20 | 国家电网公司 | Series resonant-type fault current limiter |
| CN105790227A (en) * | 2016-04-20 | 2016-07-20 | 安徽伊格瑞德电气设备有限公司 | Series compensation zero-loss current limiting integrated system |
| CN205595772U (en) * | 2016-04-20 | 2016-09-21 | 安徽尚途电力保护设备有限公司 | Series resonance zero loss current limiting device |
| CN106099938A (en) * | 2016-06-24 | 2016-11-09 | 安徽尚途电力保护设备有限公司 | A kind of high-voltage fence series compensation device |
| CN206332444U (en) * | 2016-12-30 | 2017-07-14 | 安徽徽电科技股份有限公司 | A kind of LC series resonances current-limiting apparatus |
-
2016
- 2016-12-30 CN CN201611265550.1A patent/CN106786442A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5500690A (en) * | 1993-09-29 | 1996-03-19 | U.S. Philips Corporation | Television apparatus provided with a device for selecting different sources |
| CN105790242A (en) * | 2014-12-17 | 2016-07-20 | 国家电网公司 | Series resonant-type fault current limiter |
| CN105119299A (en) * | 2015-08-26 | 2015-12-02 | 安徽徽电科技股份有限公司 | Middle and high voltage power grid distributed series compensation system |
| CN105790227A (en) * | 2016-04-20 | 2016-07-20 | 安徽伊格瑞德电气设备有限公司 | Series compensation zero-loss current limiting integrated system |
| CN205595772U (en) * | 2016-04-20 | 2016-09-21 | 安徽尚途电力保护设备有限公司 | Series resonance zero loss current limiting device |
| CN106099938A (en) * | 2016-06-24 | 2016-11-09 | 安徽尚途电力保护设备有限公司 | A kind of high-voltage fence series compensation device |
| CN206332444U (en) * | 2016-12-30 | 2017-07-14 | 安徽徽电科技股份有限公司 | A kind of LC series resonances current-limiting apparatus |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107394756A (en) * | 2017-09-06 | 2017-11-24 | 安徽徽电科技股份有限公司 | A kind of direct current based on LC concussions cut-offs system |
| CN108206527A (en) * | 2018-02-05 | 2018-06-26 | 安徽徽电科技股份有限公司 | A kind of series compensation system by SCR quick-switchings |
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Application publication date: 20170531 |