CN206850417U - One kind is based on LC parallel resonance depth current-limiting apparatus - Google Patents
One kind is based on LC parallel resonance depth current-limiting apparatus Download PDFInfo
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- CN206850417U CN206850417U CN201720394810.9U CN201720394810U CN206850417U CN 206850417 U CN206850417 U CN 206850417U CN 201720394810 U CN201720394810 U CN 201720394810U CN 206850417 U CN206850417 U CN 206850417U
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- 239000003990 capacitor Substances 0.000 claims abstract description 42
- 238000002955 isolation Methods 0.000 claims abstract description 22
- 238000013016 damping Methods 0.000 claims 1
- 230000005540 biological transmission Effects 0.000 description 3
- 230000005611 electricity Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
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Abstract
It the utility model is related to one kind and be based on LC parallel resonance depth current-limiting apparatus, including resonant capacitor C, current-limiting reactor L, high-speed eddy switchs K0, isolation switch G1, G2, G3, the end of incoming cables of the resonant capacitor C is connected through isolation switch G1 with the end of incoming cables AL1 of power distribution cabinet, resonant capacitor C leading-out terminal is connected through isolation switch G2 with the leading-out terminal AL2 of power distribution cabinet, the current-limiting reactor L is parallel to resonant capacitor C both ends, isolation switch G3 one end is connected with isolation switch G1 end of incoming cables, isolation switch G3 leading-out terminal is connected with isolation switch G2 leading-out terminal, the high-speed eddy switch K0 is parallel to resonant capacitor C both ends.The utility model electrical structure is simple, safe and reliable, by current-limiting reactor L and resonant capacitor C-shaped into parallel resonance, the intensity of short circuit can be effectively limited, impact of the short circuit current to electrical equipment is greatly reduced, improves the stability, reliability and security of system.
Description
Technical field
It the utility model is related to electric power system power distribution equipment current limiting technique field, and in particular to one kind is based on LC parallel resonances
Depth current-limiting apparatus.
Background technology
With expanding economy, with the sharp increase of electric load, the increase of net capacity, the short circuit current constantly increased
Impact to power system electrical equipment is increasing；Meanwhile the connecting-disconnecting function of existing breaker be difficult to satisfaction cut-off it is huge
Big short circuit current.Therefore to solve this great difficult problem, the mode that current-limiting reactor is concatenated in loop is widely used in electric power
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 electricity
The impact of electrical equipment in Force system, and busbar voltage is maintained, avoid the further expansion of short trouble.But current limliting of connecting electricity
Anti- device but has many weak points, first, huge reactive loss is produced in current-limiting reactor series loop and is also caused to user
Very big financial burden；Secondly, when choosing the reactance value of current-limiting reactor, often there is meet wanting for limiting short-circuit current
After asking, the contradiction of user terminal brownout under rated current.During the long distance delivery of power system transmission and distribution network, power transmission line
Road can also produce induction reactance, substantially equally form the reactor in a kind of stealthy, potential concatenation user load loop, together
Sample causes the reduction of user terminal voltage, while has larger reactive loss again.
Utility model content
The purpose of this utility model is that providing one kind is based on LC parallel resonance depth current-limiting apparatus, and the current-limiting apparatus passes through
Current-limiting reactor L, into parallel resonance, can greatly reduce impact of the short circuit current to electrical equipment, improve with resonant capacitor C-shaped
The stability and security of power system.
To achieve the above object, the utility model employs following technical scheme：Including resonant capacitor C, current-limiting reactor
Device L, high-speed eddy switch K0, isolation switch G1, G2, G3, the end of incoming cables of the resonant capacitor C is through isolation switch G1 and distribution
The end of incoming cables AL1 of cabinet is connected, and resonant capacitor C leading-out terminal is connected through isolation switch G2 with the leading-out terminal AL2 of power distribution cabinet, described
Current-limiting reactor L is parallel to resonant capacitor C both ends, and isolation switch G3 one end is connected with isolation switch G1 end of incoming cables,
Isolation switch G3 leading-out terminal is connected with isolation switch G2 leading-out terminal, and the high-speed eddy switch K0 is parallel to resonant capacitor
C both ends.
In such scheme, the electric discharge damper RL is in parallel and formed by inductance L and resistance R, and electric discharge damper RL's enters
Row end is connected with resonant capacitor C end of incoming cables, the end of incoming cables phase of electric discharge damper RL leading-out terminal and high-speed eddy switch K0
Even.
In such scheme, the high-speed eddy switch K0 is vacuum interrupter arc extinguishing breaker.
In such scheme, the high-speed eddy switch K0 controls it to cut-off by the controller being installed in power distribution cabinet.
As shown from the above technical solution, one kind described in the utility model is based on LC parallel resonance depth current-limiting apparatus, knot
Structure is simple, safe and reliable, by current-limiting reactor L and resonant capacitor C-shaped into parallel resonance, can effectively limit the strong of short circuit
Degree, greatly reduces impact of the short circuit current to electrical equipment, improves the stability, reliability and security of system.
Brief description of the drawings
Fig. 1 is electrical schematic diagram of the present utility model.
Embodiment
The utility model is described further below in conjunction with the accompanying drawings：
As shown in figure 1, the present embodiment is hindered based on LC parallel resonance depth current-limiting apparatus, including resonant capacitor C, electric discharge
Buddhist nun's device RL and current-limiting reactor L, resonant capacitor C end of incoming cables are connected with the end of incoming cables AL1 of power distribution cabinet, resonant capacitor C's
Leading-out terminal is connected with the leading-out terminal AL2 of power distribution cabinet, and resonance reactor L end of incoming cables is connected with resonant capacitor C end of incoming cables, its
Leading-out terminal is connected with resonant capacitor C leading-out terminal.Resonant capacitor C is used to form parallel resonance, shape with current-limiting reactor L
Into infinite-impedance, power system short circuit currents are limited thoroughly, greatly reduce impact of the short circuit current to electrical equipment.
Electric discharge damper RL end of incoming cables is connected with resonant capacitor C end of incoming cables, electric discharge damper RL leading-out terminal warp
High-speed eddy switch K0 is connected with resonant capacitor C leading-out terminal.In the present embodiment, damper RL is by inductance L and resistance R for electric discharge
Be in parallel composition.Electric discharge damper RL is used for the discharge impact electric current for limiting current-limiting reactor L and resonant capacitor C, prevents
Current-limiting reactor L and resonant capacitor C are damaged due to excessively stream, substantially increase current-limiting reactor L and resonant capacitor C throwing
Enter the frequency of current limliting.
Electric discharge damper RL is in parallel and formed by inductance L and resistance R, electric discharge damper RL hold and resonant capacitor
C end of incoming cables is connected, and electric discharge damper RL leading-out terminal is connected with high-speed eddy switch K0 end of incoming cables.High-speed eddy switchs K0
For vacuum interrupter arc extinguishing breaker, high-speed eddy switch K0 controls it to cut-off by the controller being installed in power distribution cabinet.
Operation principle：
During normal operation, the current-limiting reactor L and resonant capacitor C concatenated in load circuit is short by high-speed eddy switch K0
Connect, any financial burden will not be caused to user, realize the economic aim that current-limiting reactor L zero is lost.Current-limiting reactor L and
After resonant capacitor C short circuits so that under normal power supply running status, no matter load and how to change, make user's load terminal voltage
Equal to busbar voltage.
When short trouble occurs, high-speed eddy switch K0 separating brakes in 2ms, make current-limiting reactor L and resonant capacitor C
Quickly in concatenation loop, resonant capacitor C and current-limiting reactor L forms parallel resonance, infinite-impedance is formed, by power train
Short circuit currents limitation of uniting is thorough, greatly reduces impact of the short circuit current to electrical equipment, the intensity of effective limiting short-circuit current.
After short trouble releases, controller sends combined floodgate order, high-speed eddy switch K0 to high-speed eddy switch K0 immediately in system
Can within 2ms rapid short circuit current-limiting reactor L and resonant capacitor C；When current-limiting reactor L and resonant capacitor C are protected
Afterwards, the damper RL that discharges discharges current-limiting reactor L and resonant capacitor C immediately, discharges current-limiting reactor L and resonant capacitor
The electric energy of C storages, is prevented current-limiting reactor L and resonant capacitor C from being damaged due to excessively stream, substantially increases current-limiting reactor L
With the frequency of resonant capacitor C input current limliting.
Service without power-off is realized by isolation switch G1, G2, G3, reduces the power failure range of maintenance repair and trouble hunting,
The reliability and security of power supply are greatly improved, while is avoided because interruption maintenance brings economic loss.
Embodiment described above is only that preferred embodiment of the present utility model is described, not to this practicality
New scope is defined, and on the premise of the utility model design spirit is not departed from, those of ordinary skill in the art are to this
The various modifications and improvement that the technical scheme of utility model is made, the protection of the utility model claims book determination all should be fallen into
In the range of.
Claims (4)
1. one kind is based on LC parallel resonance depth current-limiting apparatus, it is characterised in that：Including resonant capacitor C, current-limiting reactor L,
High-speed eddy switchs K0, and isolation switch G1, G2, G3, resonant capacitor C end of incoming cables is through isolation switch G1 and power distribution cabinet
End of incoming cables AL1 is connected, and resonant capacitor C leading-out terminal is connected through isolation switch G2 with the leading-out terminal AL2 of power distribution cabinet, the current limliting
Reactor L is parallel to resonant capacitor C both ends, and isolation switch G3 one end is connected with isolation switch G1 end of incoming cables, isolation
Disconnecting link G3 leading-out terminal is connected with isolation switch G2 leading-out terminal, and the high-speed eddy switch K0 is parallel to resonant capacitor C's
Both ends.
2. according to claim 1 be based on LC parallel resonance depth current-limiting apparatus, it is characterised in that：Also include electric discharge damping
Device RL, the end of incoming cables of the electric discharge damper RL are connected with resonant capacitor C end of incoming cables, and its leading-out terminal switchs with high-speed eddy
K0 end of incoming cables is connected.
3. according to claim 1 be based on LC parallel resonance depth current-limiting apparatus, it is characterised in that：The high-speed eddy is opened
Pass K0 is vacuum interrupter arc extinguishing breaker.
4. according to claim 1 be based on LC parallel resonance depth current-limiting apparatus, it is characterised in that：The high-speed eddy is opened
Close K0 controls it to cut-off by the controller being installed in power distribution cabinet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720394810.9U CN206850417U (en) | 2017-04-16 | 2017-04-16 | One kind is based on LC parallel resonance depth current-limiting apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720394810.9U CN206850417U (en) | 2017-04-16 | 2017-04-16 | One kind is based on LC parallel resonance depth current-limiting apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206850417U true CN206850417U (en) | 2018-01-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720394810.9U Expired - Fee Related CN206850417U (en) | 2017-04-16 | 2017-04-16 | One kind is based on LC parallel resonance depth current-limiting apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206850417U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106953308A (en) * | 2017-04-16 | 2017-07-14 | 安徽徽电科技股份有限公司 | One kind is based on LC parallel resonance depth current-limiting apparatus |
-
2017
- 2017-04-16 CN CN201720394810.9U patent/CN206850417U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106953308A (en) * | 2017-04-16 | 2017-07-14 | 安徽徽电科技股份有限公司 | One kind is based on LC parallel resonance depth current-limiting apparatus |
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180105 |
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| CF01 | Termination of patent right due to non-payment of annual fee |