CN203278210U - Busbar residual voltage maintaining device - Google Patents
Busbar residual voltage maintaining device Download PDFInfo
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- CN203278210U CN203278210U CN 201320032402 CN201320032402U CN203278210U CN 203278210 U CN203278210 U CN 203278210U CN 201320032402 CN201320032402 CN 201320032402 CN 201320032402 U CN201320032402 U CN 201320032402U CN 203278210 U CN203278210 U CN 203278210U
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Abstract
The utility model provides a busbar residual voltage maintaining device and relates to the technical field of an electric system. The busbar residual voltage maintaining device comprises a Rogowski coil, a measurement and control unit, a transverter, a cut off switch, a current-limiting impedance, a microcomputer comprehensive protector and a current transformer; a terminal of the measurement and control unit is connected with the Rogowski coil, the other terminal is respectively connected with a terminal of the microcomputer comprehensive protector, a terminal of the transverter, a terminal of the cut off switch and a terminal of the current-limiting impedance; and the other terminal of the microcomputer comprehensive protector is connected with the current transformer, a terminal of the current-limiting impedance is connected with the cut off switch, and the other terminal of the current-limiting impedance is connected with the other termianl of the transverter. The busbar residual voltage maintaining device can replace a branch breaker and a common series connected current limiting reactor, and trigger the current limiting impedance rapidly; and a residual voltage of a busbar is recovered up to more than 95% of a rated voltage rapidly, so the busbar residual voltage maintaining device can not only maintain the residual voltage of the busbar, but also completely meet the need for maintaining important loads to operate continually without influences, and raise the power supply quality for important loads which do not allow to be supplied in instant intervals and need to self start forcedly.
Description
Technical field
The utility model relates to technical field of power systems, is specifically related to a kind of bus residual voltage holding device.
Background technology
in the electric power system of a certain electric pressure of current a lot of enterprises medium voltage network, if a certain branch road is short-circuited, suddenly fall seriously with voltage on bus that this branch road is connected, the bus residual voltage is generally lower than 20% of specified definition voltage, only have this branch breaker of working as to cut-off, excised short trouble, busbar voltage could be recovered, busbar voltage is exactly the time that circuit breaker cut-offs short trouble from suddenly dropping to recovery during this period of time, greatly about about 0.1 second, time of computer integrated protection failure judgement (20ms-30ms) namely, add circuit breaker intrinsic operate time (40ms-80ms), adding electric arc zero-crossing timing (16ms left and right), busbar voltage depression occurs during this period of time, Enterprise Power System is referred to as " rolling electricity "." rolling electricity " is between the emergence period, the bus residual voltage is very low, the load running of some faults that are not short-circuited is interrupted, as frequency converter, motor, relay, electromagnetically operated valve etc., these loads to " rolling electricity " significant reaction are referred to as sensitive loads, be characterized in mechanical movement and electric energy arranged or the existence of magnetic energy energy-storage travelling wave tube, the motor that uses in enterprise mostly is asynchronous machine, and the maintenance of the rotating magnetic field of asynchronous machine comes from the reactive power support of electrical network, during certain branch, short-circuit, the bus residual voltage is very low, asynchronous machine on other branch roads can not get reactive power support, and also want the short dot output short circuit current, the short circuit time constant of asynchronous machine is below 30ms, " rolling electricity " be 3T around, press the magnetic field approach exhaustion of the asynchronous machine of index law decay, the moment that voltage recovers after the short circuit trouble point excision, electrical network rebuilds to asynchronous machine the impact that magnetic field has produced 5-7 times of rated current, cause protective relaying maloperation to do.
usually bus remains in 50% when following, tolerable " rolling electricity " time of sensitive loads is not more than 30ms, when the foreign network fault that is short-circuited, district's whole loads of Intranet or part important load can be switched to another foreign network, but in district's Intranet, certain minute branch road is short-circuited and just can not integral body have switched, can only partly switch, if the people is original just few for focusing on minority branch road or other ways for sensitive loads important in district's Intranet, it is to solve the problem that district's Intranet short circuit causes important load to stop transport that part is switched, necessary condition is that the suitable foreign network that can switch will be arranged, if sensitive loads branch road important in district's Intranet is a lot, the cost that part is switched is just too large.
Summary of the invention
The purpose of this utility model is to provide a kind of bus residual voltage holding device, and it can substitute branch breaker, common series connection current limiting reactor, can drop into fast current-limiting impedance, and the residual voltage of bus is high, can satisfy to keep that important load continues operation and unaffected.
In order to solve existing problem in background technology; the utility model is by the following technical solutions: it comprises Rogowski coil 1, measurement and control unit 2, converter 3, disconnecting switch 4, current-limiting impedance 5, computer integrated protection 6, current transformer 7; described measurement and control unit 2 one termination Rogowski coils 1; the other end connects respectively computer integrated protection 6 one ends, converter 3 one ends, disconnecting switch 4 and current-limiting impedance 5 one ends; computer integrated protection 6 another termination current transformers 7; current-limiting impedance 5 one termination disconnecting switches 4, another termination converter 3 other ends.
measurement and control unit of the present utility model monitors branch current by Rogowski coil, when short circuit current enters in current-limiting impedance, limiting short-circuit current, amplitude of short circuit reduces greatly, can be in branch equipment be short-circuited fault 6-16 millisecond, the bus residual voltage is remained on more than 95% of rated voltage, guaranteed the normal operation of other fault-free sensitive loads, the suffered short-circuit impacts of equipment such as while main transformer reduce greatly, after dividing the short trouble D1 excision in branch road, measurement and control unit detection branch electric current during near rated current immediately to the converter order, in 10 milliseconds, current-limiting impedance withdraws from, normal operation can recover in system, the branch road of fault is being short-circuited over 300 milliseconds if be short-circuited, fault is not removed, measurement and control unit can be thought minute branch road vacuum circuit-breaker tripping of fault point or the busbar fault of branch road, send the separating brake order to disconnecting switch immediately, excise this branch road.
Bus residual voltage holding device of the present utility model, it can substitute branch breaker, common series connection current limiting reactor, can drop into fast current-limiting impedance, the residual voltage of bus returns to rapidly rated voltage more than 95%, not only kept the bus residual voltage, can satisfy fully and keep that important load continues operation and unaffected, to not allowing the instantaneous interruptedly supplying power important load of self-starting by force, can improve power supply quality.
Description of drawings
Fig. 1 is electrical schematic diagram of the present utility model
Embodiment
Referring to Fig. 1; a kind of bus residual voltage holding device; it comprises Rogowski coil 1, measurement and control unit 2, converter 3, disconnecting switch 4, current-limiting impedance 5, computer integrated protection 6, current transformer 7; described measurement and control unit 2 one termination Rogowski coils 1; the other end connects respectively computer integrated protection 6 one ends, converter 3 one ends, disconnecting switch 4 and current-limiting impedance 5 one ends; computer integrated protection 6 another termination current transformers 7; current-limiting impedance 5 one termination disconnecting switches 4, another termination converter 3 other ends.
measurement and control unit of the present utility model monitors branch current by Rogowski coil, when short circuit current enters in current-limiting impedance, limiting short-circuit current, amplitude of short circuit reduces greatly, can be in branch equipment be short-circuited fault 6-16 millisecond, the bus residual voltage is remained on more than 95% of rated voltage, guaranteed the normal operation of other fault-free sensitive loads, the suffered short-circuit impacts of equipment such as while main transformer reduce greatly, after dividing the short trouble D1 excision in branch road, measurement and control unit detection branch electric current during near rated current immediately to the converter order, in 10 milliseconds, current-limiting impedance withdraws from, normal operation can recover in system, the branch road of fault is being short-circuited over 300 milliseconds if be short-circuited, fault is not removed, measurement and control unit can be thought minute branch road vacuum circuit-breaker tripping of fault point or the busbar fault of branch road, send the separating brake order to disconnecting switch immediately, excise this branch road.
Bus residual voltage holding device of the present utility model, it can substitute branch breaker, common series connection current limiting reactor, can drop into fast current-limiting impedance, the residual voltage of bus returns to rapidly rated voltage more than 95%, not only kept the bus residual voltage, can satisfy fully and keep that important load continues operation and unaffected, to not allowing the instantaneous interruptedly supplying power important load of self-starting by force, can improve power supply quality.
Claims (1)
1. bus residual voltage holding device, it is characterized in that, it comprises Rogowski coil (1), measurement and control unit (2), converter (3), disconnecting switch (4), current-limiting impedance (5), computer integrated protection (6), current transformer (7), described measurement and control unit (2) one termination Rogowski coils (1), the other end connects respectively computer integrated protection (6) one ends, converter (3) one ends, disconnecting switch (4) and current-limiting impedance (5) one ends, another termination current transformer (7) of computer integrated protection (6), current-limiting impedance (5) one termination disconnecting switches (4), another termination converter (3) other end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320032402 CN203278210U (en) | 2013-01-22 | 2013-01-22 | Busbar residual voltage maintaining device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320032402 CN203278210U (en) | 2013-01-22 | 2013-01-22 | Busbar residual voltage maintaining device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203278210U true CN203278210U (en) | 2013-11-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201320032402 Expired - Fee Related CN203278210U (en) | 2013-01-22 | 2013-01-22 | Busbar residual voltage maintaining device |
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| CN (1) | CN203278210U (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104868455A (en) * | 2015-06-01 | 2015-08-26 | 安徽禄讯电子科技有限公司 | Bus residual voltage maintaining device |
| CN104953572A (en) * | 2015-07-23 | 2015-09-30 | 合肥扬帆通信元器件有限公司 | Bus residual voltage holding device |
| CN105098744A (en) * | 2014-11-18 | 2015-11-25 | 芜湖蓝宙电子科技有限公司 | Bus residual voltage maintenance device |
| CN106208003A (en) * | 2016-08-28 | 2016-12-07 | 安徽普天电力科技有限公司 | A kind of bus residual voltage holding means |
| CN106329534A (en) * | 2015-06-16 | 2017-01-11 | 中国石油天然气股份有限公司 | Method, device and system for maintaining outlet voltage of distribution network |
| CN111509696A (en) * | 2020-04-24 | 2020-08-07 | 广东电网有限责任公司珠海供电局 | Battery energy storage system |
-
2013
- 2013-01-22 CN CN 201320032402 patent/CN203278210U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105098744A (en) * | 2014-11-18 | 2015-11-25 | 芜湖蓝宙电子科技有限公司 | Bus residual voltage maintenance device |
| CN104868455A (en) * | 2015-06-01 | 2015-08-26 | 安徽禄讯电子科技有限公司 | Bus residual voltage maintaining device |
| CN106329534A (en) * | 2015-06-16 | 2017-01-11 | 中国石油天然气股份有限公司 | Method, device and system for maintaining outlet voltage of distribution network |
| CN106329534B (en) * | 2015-06-16 | 2019-06-11 | 中国石油天然气股份有限公司 | The line voltage of distribution network maintains method and apparatus and system |
| CN104953572A (en) * | 2015-07-23 | 2015-09-30 | 合肥扬帆通信元器件有限公司 | Bus residual voltage holding device |
| CN106208003A (en) * | 2016-08-28 | 2016-12-07 | 安徽普天电力科技有限公司 | A kind of bus residual voltage holding means |
| CN111509696A (en) * | 2020-04-24 | 2020-08-07 | 广东电网有限责任公司珠海供电局 | Battery energy storage system |
| CN111509696B (en) * | 2020-04-24 | 2022-04-12 | 广东电网有限责任公司珠海供电局 | Battery energy storage system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131106 Termination date: 20150122 |
|
| EXPY | Termination of patent right or utility model |