CN206628821U - A kind of LC series resonances bus residual voltage keeps system - Google Patents
A kind of LC series resonances bus residual voltage keeps system Download PDFInfo
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- CN206628821U CN206628821U CN201720233129.6U CN201720233129U CN206628821U CN 206628821 U CN206628821 U CN 206628821U CN 201720233129 U CN201720233129 U CN 201720233129U CN 206628821 U CN206628821 U CN 206628821U
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- Prior art keywords
- incoming cables
- resonant capacitor
- leading
- out terminal
- residual voltage
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- 239000003990 capacitor Substances 0.000 claims abstract description 35
- 238000002955 isolation Methods 0.000 claims abstract description 23
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000011787 zinc oxide Substances 0.000 claims abstract description 9
- 230000002265 prevention Effects 0.000 claims description 6
- 230000008033 biological extinction Effects 0.000 claims description 2
- 238000012423 maintenance Methods 0.000 abstract description 4
- 230000006837 decompression Effects 0.000 abstract description 3
- 238000010276 construction Methods 0.000 abstract description 2
- 230000005611 electricity Effects 0.000 description 6
- 230000009471 action Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000007246 mechanism 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
- 230000001681 protective effect Effects 0.000 description 1
Abstract
It the utility model is related to a kind of LC series resonances bus residual voltage and keep system, including zinc oxide FR, resonant capacitor C and the electric discharge damper RL to be connected with resonant capacitor C, the end of incoming cables of the electric discharge damper RL switchs K1 through high-speed eddy successively, isolation switch G1 is connected with the end of incoming cables of power distribution cabinet, resonant capacitor C leading-out terminal is connected through current-limiting reactor L, isolation switch G2 with the leading-out terminal of power distribution cabinet successively, the end of incoming cables of the zinc oxide FR is connected with the end of incoming cables for the damper RL that discharges, and its output end is connected with resonant capacitor C leading-out terminal.The utility model has reliability height, the advantages that acting fast, simple in construction, safety and stability, not decompression of the bus in feeder line branch, short-circuit failure is effectively ensured, realize that short trouble excision stepmother protects zero loss of reactor, the reliability and security of power supply are improved, while avoids and brings economic loss because of the component in interruption maintenance or replacing 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 a kind of LC series resonances bus
Residual voltage keeps system.
Background technology
As expanding economy, the sharp increase of business electrical load, power network median generatrix institute band branch road are more and more, work as mother
Short circuit occurs for a certain bar branch road under line, and drop is serious suddenly for the busbar voltage being connected with the branch road, and the remaining voltage of bus is generally below
The 20% of rated voltage, only when the branch breaker cut-offs, short trouble is cut off, busbar voltage could be recovered.Busbar voltage
To recover this period be exactly time that breaker cut-offs short trouble from dropping to suddenly, and about at 0.1 second or so, that is, microcomputer is comprehensive
Close the time of protection failure judgement（20ms-30ms）, plus breaker intrinsic actuation time（40ms-80ms）, along with electric arc
Zero-crossing timing（16ms or so）.There is this period that is recessed in busbar voltage, and Enterprise Power System is referred to as " shaking electricity "." shaking electricity "
During generation, bus residual voltage is very low, makes some that the load running of short trouble interruption not occur, such as frequency converter, motor, relay
Device, magnetic valve etc..These loads to " shake electricity " significant reaction are referred to as sensitive loads, have been characterized in mechanical movement and have had
The presence of electric energy or magnetic energy energy-storage travelling wave tube.The motor used in enterprise is mostly asynchronous machine, and the rotating excitation field of asynchronous machine
Keep coming from the reactive power support of power network, bus residual voltage is very low during certain branch, short-circuit, and the asynchronous machine on other branch roads cannot
Reactive power support, and also " to be shaken typically in below 30ms to short dot output short circuit current, the short circuit time constant τ of asynchronous machine
The time, the magnetic field for the asynchronous machine exponentially decayed was depleted close to 3 τ for electricity ", and voltage is extensive after short circuit trouble point excision
At the time of multiple, power network rebuilds the impact that magnetic field generates 5-7 times of rated current to asynchronous machine, causes protective relaying maloperation to make.
When usual bus residual voltage is below 50%, sensitive loads tolerable " shaking electricity " time is not more than 30ms.When short circuit occurs for foreign network
Failure, can be overall by area's Intranet（All loads）Or part important load is switched to another foreign network, but certain in area's Intranet
Short circuit, which occurs, for branch road integrally have switched, and can only partly switch.If important sensitive loads are artificially concentrated in area's Intranet
Originally few to a small number of branch roads or its circuitry number, part switching is that can solve area's Intranet short circuit to cause asking for important load stoppage in transit
Topic, necessary condition is that to have the suitable foreign network that can switch.If important sensitive loads branch road is many in area's Intranet, part
The cost of switching is just too big, if changeable foreign network condition does not possess, then to solve area's Intranet and shake electric problem, adopt
It is desirable scheme with bus residual voltage holding meanss.
The bus residual voltage holding meanss that existing market uses all are that the input of reactor is protected by High-speed on-off control mother, just
Often during operation, speed-sensitive switch short circuit is female to protect reactor, when short trouble occurs for branch road, speed-sensitive switch separating brake, mother is protected reactance
Device is concatenated into circuit, occurs to need 18ms to speed-sensitive switch separating brake from short trouble, short trouble is possible to be expanded to bus
Side, larger range of Power System Shortcuts will be caused.
Utility model content
The purpose of this utility model is that providing a kind of LC series resonances bus residual voltage keeps system, is effectively ensured bus and exists
Not decompression during feeder line branch, short-circuit failure, realize that short trouble excision stepmother protects zero loss of reactor, that improves power supply can
By property and security, avoid and bring economic loss because of the component in interruption maintenance or replacing system.
To achieve the above object, the utility model employs following technical scheme：
A kind of LC series resonances bus residual voltage keeps system, including zinc oxide FR, resonant capacitor C and and resonant capacitor
The electric discharge damper RL of C series connection, the electric discharge damper RL end of incoming cables successively through high-speed eddy switch K1, isolation switch G1 with
The end of incoming cables of power distribution cabinet is connected, and resonant capacitor C leading-out terminal is successively through current-limiting reactor L, isolation switch G2 and power distribution cabinet
Leading-out terminal is connected, and the end of incoming cables of the zinc oxide FR is connected with the end of incoming cables for the damper RL that discharges, its output end and resonant capacitance
Device C leading-out terminal is connected.
In such scheme, in addition to discharge prevention system, the discharge prevention system be used to protecting resonant capacitor C not by
Burn out, the intensity of limiting short-circuit current, isolate short circuit trouble point.
The one end and electric discharge damper RL of the discharge prevention system using high-speed eddy switch K0, the high-speed eddy KO
End of incoming cables be connected, its other end is connected with resonant capacitor C leading-out terminal.
In such scheme, in addition to isolation switch G3, the end of incoming cables of the isolation switch G3 and isolation switch G1 inlet wire
End is connected, and its leading-out terminal is connected with isolation switch G2 leading-out terminal.
The electric discharge damper RL is in parallel and formed by inductance L1 and resistance R, the end of incoming cables of the electric discharge damper RL with
High-speed eddy switch K1 leading-out terminal is connected, and its leading-out terminal is connected with resonant capacitor C end of incoming cables.
Described high-speed eddy switch K0, K1 are vacuum extinction formula breaker.
As shown from the above technical solution, LC series resonances bus residual voltage described in the utility model keeps system, and having can
High by property, the advantages that action is fast, simple in construction, safety and stability, the series resonance bus residual voltage keeps system can be thrown in 2ms
Enter female guarantor reactor L, it is normal operation rated current size to make feeder current, prevents the further expansion of short trouble scope,
Not decompression of the bus in feeder line branch, short-circuit failure is effectively ensured, can realize that short trouble excision stepmother protects reactor again
Zero loss, while and can realizes the component in service without power-off or replacing system by isolation switch, greatly improves power supply
Reliability and security, while avoid and bring economic loss because of the component in interruption maintenance or replacing 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, a kind of LC series resonances bus residual voltage keeps system, including high-speed eddy switch K0, isolation switch
G3, zinc oxide FR, resonant capacitor C and the electric discharge damper RL to be connected with resonant capacitor C, electric discharge damper RL end of incoming cables
It is connected successively through high-speed eddy switch K1, isolation switch G1 with the end of incoming cables of power distribution cabinet, resonant capacitor C leading-out terminal passes through successively
Current-limiting reactor L, isolation switch G2 are connected with the leading-out terminal of power distribution cabinet, zinc oxide FR end of incoming cables and entering for electric discharge damper RL
Line end is connected, and its output end is connected with resonant capacitor C leading-out terminal.High-speed eddy KO one end is with electric discharge damper RL's
End of incoming cables is connected, and its other end is connected with resonant capacitor C leading-out terminal；Isolation switch G3 end of incoming cables and isolation switch G1
End of incoming cables be connected, its leading-out terminal is connected with isolation switch G2 leading-out terminal.
The present embodiment, resonant capacitor C is used for normal operation and forms series resonance with female reactor L that protects, and realizes female protect
Reactor L zero is lost；High-speed eddy switchs K0, and for the short circuit resonant capacitor C in 2ms after short circuit, female electricity is protected so as to put into
Anti- device L, the intensity of limiting short-circuit current, enables the breaker of failure side to be effectively isolated short circuit trouble point；High-speed eddy switchs K1,
For when failure side breaker can not be effectively isolated trouble point, cutting off whole piece feeder line immediately, preventing that short trouble is further
Expand.The high-speed eddy switch K0, K1 control it to cut-off by the fast acting control system in power distribution cabinet, the present embodiment
In, high-speed eddy switch K0, K1 are vacuum interrupter arc extinguishing breaker.The zinc oxide FR, for being limited after system short-circuit
The voltage at resonant capacitor C both ends, prevent resonant capacitor C from being damaged because of overvoltage.
The electric discharge damper RL of the present embodiment is in parallel and formed by inductance L1 and resistance R, electric discharge damper RL end of incoming cables
It is connected with high-speed eddy switch K1 leading-out terminal, its leading-out terminal is connected with resonant capacitor C end of incoming cables.Its leading-out terminal and resonance
Capacitor C end of incoming cables is connected, and electric discharge damper RL discharges its electric energy after being used for the protection of resonant capacitor C short circuits.Isolation knife
Lock G1, G2, G3 are connected with the operating mechanism in power distribution cabinet, and by manual control, it cut-offs, isolation switch G1,
The component that G2, G3 are used in service without power-off or replacing system, greatly improves the reliability and security of power supply, avoids simultaneously
Because interruption maintenance brings economic loss.
Operation principle is as follows：
During normal operation, the current-limiting reactor L and resonant capacitor C concatenated in load circuit forms series resonance, makes
The reactive loss of current-limiting reactor L consumption is provided by resonant capacitor C completely, and 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 resonant capacitor C forms series resonance so that just
Under normal powered operation state, no matter load and how to change, current-limiting reactor L is formed with resonant capacitor C and connected for power frequency
Resonance, user's load terminal voltage is set to be equal to busbar voltage.
When short trouble occurs for any branch road under bus feeder line, high-speed eddy switch K0, short circuit is humorous in 2ms after short circuit
Shake capacitor C, so as to put into female guarantor reactor L, protects reactor L by mother and the short-circuit current of this feeder line is restricted into this
The size of the rated current of bar feeder line, so as to effectively prevent bus from making whole piece bus loss of pressure because a branch road breaks down, greatly
The big scope for reducing short trouble.When mother protects reactor L inputs, fault branch short circuit current substantially reduces, branch breaker
The short trouble of the branch road can effectively be cut off；When the branch breaker is because breaking down, it is impossible to fast and effective this branch road of excision
Short trouble when, by controller in series resonance bus residual voltage holding system control immediately high-speed eddy switch K1 separating brakes, will
Whole piece branch road is isolated, and prevents the further expansion of short trouble.After short trouble is cut off by this branch breaker, quickly
Control system control high-speed eddy switchs K0 separating brakes immediately, and resonant capacitor C is sealed in loop, and protecting reactor L with mother is formed
Series resonance, prevent that female guarantor reactor L from putting into a large amount of reactive loss of consumption for a long time and the actual motion of user terminal brownout is asked
Topic.
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 (6)
1. a kind of LC series resonances bus residual voltage keeps system, it is characterised in that：Including zinc oxide FR, resonant capacitor C and with
The electric discharge damper RL of resonant capacitor C series connection, the electric discharge damper RL end of incoming cables successively through high-speed eddy switch K1, every
It is connected from disconnecting link G1 with the end of incoming cables of power distribution cabinet, resonant capacitor C leading-out terminal is successively through current-limiting reactor L, isolation switch G2
It is connected with the leading-out terminal of power distribution cabinet, the end of incoming cables of the zinc oxide FR is connected with the end of incoming cables for the damper RL that discharges, its output end
It is connected with resonant capacitor C leading-out terminal.
2. LC series resonances bus residual voltage according to claim 1 keeps system, it is characterised in that：Also include discharge prevention
System, the discharge prevention system are used to protect resonant capacitor C not to be burned, the intensity of limiting short-circuit current, isolation short circuit
Trouble point.
3. LC series resonances bus residual voltage according to claim 2 keeps system, it is characterised in that：The discharge prevention system
System is connected using high-speed eddy switch K0, the high-speed eddy KO one end with the end of incoming cables for the damper RL that discharges, its other end
It is connected with resonant capacitor C leading-out terminal.
4. LC series resonances bus residual voltage according to claim 1 keeps system, it is characterised in that：Also include isolation switch
G3, the end of incoming cables of the isolation switch G3 are connected with isolation switch G1 end of incoming cables, the outlet of its leading-out terminal and isolation switch G2
End is connected.
5. LC series resonances bus residual voltage according to claim 1 keeps system, it is characterised in that：The electric discharge damper
RL is in parallel and formed by inductance L1 and resistance R, the end of incoming cables of the electric discharge damper RL and high-speed eddy switch K1 leading-out terminal
It is connected, its leading-out terminal is connected with resonant capacitor C end of incoming cables.
6. LC series resonances bus residual voltage according to claim 3 keeps system, it is characterised in that：The high-speed eddy is opened
It is vacuum extinction formula breaker to close K0, K1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720233129.6U CN206628821U (en) | 2017-03-10 | 2017-03-10 | A kind of LC series resonances bus residual voltage keeps system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720233129.6U CN206628821U (en) | 2017-03-10 | 2017-03-10 | A kind of LC series resonances bus residual voltage keeps system |
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| Publication Number | Publication Date |
|---|---|
| CN206628821U true CN206628821U (en) | 2017-11-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720233129.6U Expired - Fee Related CN206628821U (en) | 2017-03-10 | 2017-03-10 | A kind of LC series resonances bus residual voltage keeps system |
Country Status (1)
| Country | Link |
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| CN (1) | CN206628821U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106899009A (en) * | 2017-03-10 | 2017-06-27 | 安徽尚途电力保护设备有限公司 | A kind of LC series resonances bus residual voltage keeps system |
-
2017
- 2017-03-10 CN CN201720233129.6U patent/CN206628821U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106899009A (en) * | 2017-03-10 | 2017-06-27 | 安徽尚途电力保护设备有限公司 | A kind of LC series resonances bus residual voltage keeps system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20211012 Address after: 230088 No. 26 Acacia Road, hi tech Zone, Anhui, Hefei Patentee after: ANHUI HUIDIAN TECHNOLOGY Co.,Ltd. Address before: 230088 No. 26 Acacia Road, hi tech Zone, Anhui, Hefei Patentee before: ANHUI SHANGTU ELECTRIC POWER PROTECTIVE APPARATUS Co.,Ltd. |
|
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20171110 |