CN202550512U - Fault current limiting device for supergrid - Google Patents
Fault current limiting device for supergrid Download PDFInfo
- Publication number
- CN202550512U CN202550512U CN2012201260093U CN201220126009U CN202550512U CN 202550512 U CN202550512 U CN 202550512U CN 2012201260093 U CN2012201260093 U CN 2012201260093U CN 201220126009 U CN201220126009 U CN 201220126009U CN 202550512 U CN202550512 U CN 202550512U
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- current limiting
- limiting reactor
- supergrid
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Abstract
The utility model relates to a fault current limiting device for a supergrid. The fault current limiting device comprises a current limiting reactor positioned on the outlet side of a generatrix of a transformer substation. The current limiting reactor is connected in series with a capacitor bank. The two ends of the current limiting reactor are connected in parallel with a first metal oxide voltage limiter for preventing the over-voltage of the current limiting reactor, and are also connected in parallel with an absorption capacitor. The two ends of the capacitor bank are connected in parallel with a second metal oxide voltage limiter. By using the technical scheme, a change in a main grid structure of a power grid can be avoided, the short-circuit current of the power grid can be effectively suppressed, investment cost for power grid structure regulation and equipment replacement caused by a reason that the short-circuit current is out of limits can be lowered and avoided, and the rise of fault current can be accurately responded and quickly suppressed.
Description
Technical field
The utility model relates to the power technology field, is specifically related to a kind of protective device.
Background technology
Along with power system development, the interconnected network scale constantly enlarges, and grid contact is more and more tightr, and the short circuit current level of electrical network also increases rapidly.When short circuit current level surpasses the greatest acceptance of switchgear; Heating and dynamo-electric effect that short circuit current is produced during through electric equipment and current carrying part possibly make electric equipment suffer serious breaking-up; Not only switchgear can not fast and effeciently be isolated the system failure; And fault is expanded; The consequence of the bringing on a disaster property of safe and stable operation of the equipment of giving and system is so the short circuit current restriction is power system planning, design, the key factor that must consider in service.
In recent years; China's sub-load center power network development is swift and violent, and installed capacity increases severely, and electric network composition is greatly strengthened; Thereupon; The short circuit current of the electrical network problem that exceeds standard is serious day by day, though rely on the adjustment short circuit current of power system operating mode to obtain certain inhibition, the adjustment space of electric network composition is very limited.
The utility model content
The purpose of the utility model is to provide a kind of fault current restraint device that is used for supergrid, to solve the problems of the technologies described above.
The technical problem that the utility model solved can adopt following technical scheme to realize:
A kind of fault current restraint device that is used for supergrid; Comprise that one is positioned at the current limiting reactor of substation busbars outlet side; It is characterized in that; The said current limiting reactor capacitor group of connecting, the two ends parallel connection one of said current limiting reactor prevents first metal oxide pressure-limiting device of said current limiting reactor overvoltage; The also parallelly connected absorption capacitor in the two ends of said current limiting reactor.
Said absorption capacitor forms a bypass discharge loop to said current limiting reactor.
The two ends of said capacitor group are parallel with second metal oxide pressure-limiting device.The overvoltage protection that is used for said capacitor group.
Also comprise a plurality of current transformers, a plurality of current transformers are connected in the circuit, and the signal output part of a plurality of current transformers connects outside master control computer; Whether the tested electric current of said master control computer judges surpasses set point or electric current climbing speed greater than set point.The master control computer is provided with the control signal output ends mouth.
The two ends of said capacitor group also are parallel with a bypass breaker, two ends parallel connection one thyristor valve of said bypass breaker, and said thyristor valve is provided with a signal input end, and signal input end connects the control signal output ends mouth of master control computer.
The thyristor valve that said thyristor valve adopts a plurality of antiparallel in twos thyristor valve assemblies to be in series, thyristor valve assembly adopt positive and negative two antiparallel thyristor valve elements to form.Guaranteeing can both provide conductive channel under electric current forward and inversion condition.
The two ends of said thyristor valve also are parallel with discharging gap device (GAP), and said discharging gap device adopts at least two discharging gap devices that the gap is in series, and the control gap is adopted at least one gap.The control gap is provided with a signal input end, and signal input end connects the control signal output ends mouth of master control computer.Said discharging gap device puncture requires two ends that certain voltage is arranged, if therefore thyristor valve conducting (or bypass breaker closes), said capacitor group voltage reduces, and then said discharging gap device can not move.The utility model transmits control signal through the master control computer; Initiatively the control gap is punctured through a pulse transformer; Make whole discharging gap device puncture voltage descend, drive main gap and puncture, accomplish the function of the controlled puncture of whole said discharging gap device.Said discharging gap device is as the backup protection equipment of said thyristor valve.
During normal the operation, said bypass breaker breaks off.Said thyristor valve and all not conductings of said discharging gap device; First metal oxide pressure-limiting device, second metal oxide pressure-limiting device are high-impedance state; The power frequency impedance of said current limiting reactor and said capacitor group is respectively j8 Ω and-j8 Ω; Said current limiting reactor and said capacitor group form series resonance, and its equiva lent impedance is zero, to not influence of external system operation.When the electric current that flows through resonant tank surpasses set point (action of circuit overcurrent protection); Or electric current is when surpassing certain value and electric current climbing speed greater than set point (line current slope protection action); The master control computer judges is that system breaks down; Give an order and trigger said thyristor valve conducting, the said bypass breaker that closes of giving an order simultaneously.If said thyristor valve conducting rapidly; Then second metal oxide pressure-limiting device protects restriction to flow through the electric current of said capacitor group in support; In addition; The protection of back that said discharging gap device is second metal oxide pressure-limiting device and said thyristor valve, if the electric current that promptly passes through in second metal oxide pressure-limiting device and the said thyristor valve is excessive, i.e. the said discharging gap device of conducting reaches the purpose of protection equipment.
Also comprise a bypass disconnecting link, said by-pass knife switch and the said current limiting reactor that is connected successively, the parallel connection of said capacitor group.Be used to withdraw from or drop into the utility model.
Beneficial effect: owing to adopt technique scheme; The utility model can be avoided the change to the electrical network main grid structure; Effectively suppress the grid short circuit electric current; Reduce and avoid the electric network composition adjustment that causes, the cost of investment that equipment replacement brings, realize correctly response, suppress fault current fast and raise because short circuit current exceeds standard.
Description of drawings
Fig. 1 is the electrical block diagram of the utility model.
Embodiment
For technological means, creation characteristic that the utility model is realized, reach purpose and be easy to understand with effect and understand, below in conjunction with the further elaboration the utility model of concrete diagram.
With reference to Fig. 1; A kind of fault current restraint device that is used for supergrid; Comprise that one is positioned at the current limiting reactor 1 of substation busbars outlet side, current limiting reactor 1 series connection one capacitor group 2, the two ends parallel connection one of current limiting reactor 1 prevents first metal oxide pressure-limiting device 5 of current limiting reactor 1 overvoltage.The also parallelly connected absorption capacitor 4 in the two ends of current limiting reactor 1.Current limiting reactor 1 is formed a bypass discharge loop.The two ends of capacitor group 2 are parallel with second metal oxide pressure-limiting device 3.The overvoltage protection that is used for capacitor group 2.
Also comprise a plurality of current transformers, a plurality of current transformers are connected in the circuit, and the signal output part of a plurality of current transformers connects outside master control computer.Whether the tested electric current of master control computer judges surpasses set point or electric current climbing speed greater than set point.The master control computer is provided with the control signal output ends mouth.
The two ends of capacitor group 2 also are parallel with a bypass breaker (BCB) 8.Two ends parallel connection one thyristor valve 7 of bypass breaker, thyristor valve 7 is provided with a signal input end, and signal input end connects the control signal output ends mouth of master control computer.The thyristor valve that thyristor valve 7 adopts a plurality of antiparallel in twos thyristor valve assemblies to be in series, thyristor valve assembly adopt positive and negative two antiparallel thyristor valve elements to form.Guaranteeing can both provide conductive channel under electric current forward and inversion condition.
The two ends of thyristor valve 7 also are parallel with discharging gap device (GAP) 9, and the control gap is adopted in discharging gap device 9, one gaps that discharging gap device 9 adopts at least two gaps to be in series, and uncontrollable gap is adopted in another gap.The control gap is provided with a signal input end, and signal input end connects the control signal output ends mouth of master control computer.
9 punctures of discharging gap device require two ends that certain voltage is arranged, if therefore thyristor valve conducting (or bypass breaker closes), capacitor group 2 voltage reduce, and then discharging gap device 9 can not move.The utility model transmits control signal through the master control computer; Initiatively the control gap is punctured through a pulse transformer; Make whole discharging gap device puncture voltage descend, drive main gap and puncture, accomplish the function of whole discharging gap device 9 controlled punctures.Discharging gap device 9 is as the backup protection equipment of thyristor valve 7.
During normal the operation, bypass breaker 8 breaks off.Thyristor valve 7 and the 9 all not conductings of discharging gap device; First metal oxide pressure-limiting device 5, second metal oxide pressure-limiting device 3 are high-impedance state; The power frequency impedance of current limiting reactor 1 and capacitor group 2 is respectively j8 Ω and-j8 Ω; Current limiting reactor 1 forms series resonance with capacitor group 2, and its equiva lent impedance is zero, to not influence of external system operation.When the electric current that flows through resonant tank surpasses set point (action of circuit overcurrent protection); Or electric current is when surpassing certain value and electric current climbing speed greater than set point (line current slope protection action); The master control computer judges is that system breaks down; Give an order and trigger thyristor valve 7 conductings, the bypass breaker 8 that closes of giving an order simultaneously.If thyristor valve 7 conducting rapidly; Then second metal oxide pressure-limiting device 3 protects restriction to flow through the electric current of capacitor group 2 in support; In addition; Discharging gap device 9 is back protections of second metal oxide pressure-limiting device 3 and thyristor valve 7, if the electric current that promptly passes through in second metal oxide pressure-limiting device 3 and the thyristor valve 7 is excessive, promptly conducting discharging gap device 9 reaches the purpose of protection equipment.
Also comprise a bypass disconnecting link 6, by-pass knife switch 6 and the current limiting reactor that is connected successively 1,2 parallel connections of capacitor group.Be used to withdraw from or drop into the utility model.
More than show and described basic principle of the utility model and the advantage of principal character and the utility model.The technical staff of the industry should understand; The utility model is not restricted to the described embodiments; The principle of describing in the foregoing description and the specification that the utility model just is described; Under the prerequisite that does not break away from the utility model spirit and scope, the utility model also has various changes and modifications, and these variations and improvement all fall in the utility model scope that requires protection.The utility model requires protection range to be defined by appending claims and equivalent thereof.
Claims (5)
1. fault current restraint device that is used for supergrid; Comprise that one is positioned at the current limiting reactor of substation busbars outlet side; It is characterized in that; The said current limiting reactor capacitor group of connecting, the two ends parallel connection one of said current limiting reactor prevents first metal oxide pressure-limiting device of said current limiting reactor overvoltage, the also parallelly connected absorption capacitor in the two ends of said current limiting reactor;
The two ends of said capacitor group are parallel with second metal oxide pressure-limiting device.
2. a kind of fault current restraint device that is used for supergrid according to claim 1; It is characterized in that; Also comprise a plurality of current transformers; A plurality of said current transformers are connected in the circuit, and the signal output part of a plurality of said current transformers connects outside master control computer, and said master control computer is provided with the control signal output ends mouth.
3. a kind of fault current restraint device that is used for supergrid according to claim 2; It is characterized in that; The two ends of said capacitor group also are parallel with a bypass breaker; Two ends parallel connection one thyristor valve of said bypass breaker, said thyristor valve is provided with a signal input end, and signal input end connects the control signal output ends mouth of master control computer.
4. a kind of fault current restraint device that is used for supergrid according to claim 3; It is characterized in that; The two ends of said thyristor valve also are parallel with the discharging gap device, and said discharging gap device adopts at least two discharging gap devices that the gap is in series, and the control gap is adopted at least one gap; Said control gap is provided with a signal input end, and said signal input end connects the control signal output ends mouth of said master control computer.
5. a kind of fault current restraint device that is used for supergrid according to claim 4 is characterized in that, also comprises a bypass disconnecting link, said by-pass knife switch and the said current limiting reactor that is connected successively, the parallel connection of said capacitor group.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201260093U CN202550512U (en) | 2012-03-29 | 2012-03-29 | Fault current limiting device for supergrid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201260093U CN202550512U (en) | 2012-03-29 | 2012-03-29 | Fault current limiting device for supergrid |
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| Publication Number | Publication Date |
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| CN202550512U true CN202550512U (en) | 2012-11-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2012201260093U Expired - Lifetime CN202550512U (en) | 2012-03-29 | 2012-03-29 | Fault current limiting device for supergrid |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105680430A (en) * | 2016-03-08 | 2016-06-15 | 北京电力设备总厂有限公司 | Dry-type hollow current-limiting reactor device |
| CN105743069A (en) * | 2016-04-20 | 2016-07-06 | 安徽尚途电力保护设备有限公司 | Series resonance zero-loss current limiting device |
| CN105846444A (en) * | 2016-05-05 | 2016-08-10 | 广西电网有限责任公司河池供电局 | Reactive power series compensation device topological wiring used for high-voltage and medium-voltage distribution network |
| CN111564830A (en) * | 2020-07-15 | 2020-08-21 | 天津动态智能科技有限公司 | Current limiting method of transformer current limiting device based on artificial zero-crossing current limiting |
-
2012
- 2012-03-29 CN CN2012201260093U patent/CN202550512U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105680430A (en) * | 2016-03-08 | 2016-06-15 | 北京电力设备总厂有限公司 | Dry-type hollow current-limiting reactor device |
| CN105743069A (en) * | 2016-04-20 | 2016-07-06 | 安徽尚途电力保护设备有限公司 | Series resonance zero-loss current limiting device |
| CN105846444A (en) * | 2016-05-05 | 2016-08-10 | 广西电网有限责任公司河池供电局 | Reactive power series compensation device topological wiring used for high-voltage and medium-voltage distribution network |
| CN111564830A (en) * | 2020-07-15 | 2020-08-21 | 天津动态智能科技有限公司 | Current limiting method of transformer current limiting device based on artificial zero-crossing current limiting |
| CN111564830B (en) * | 2020-07-15 | 2020-10-13 | 天津动态智能科技有限公司 | Current limiting method of transformer current limiting device based on artificial zero-crossing current limiting |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20121121 |
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| CX01 | Expiry of patent term |