CN105098744A - Bus residual voltage maintenance device - Google Patents
Bus residual voltage maintenance device Download PDFInfo
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- CN105098744A CN105098744A CN201410654323.2A CN201410654323A CN105098744A CN 105098744 A CN105098744 A CN 105098744A CN 201410654323 A CN201410654323 A CN 201410654323A CN 105098744 A CN105098744 A CN 105098744A
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- residual voltage
- current
- limiting impedance
- current limiting
- converter
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Abstract
The invention relates to a bus residual voltage maintenance device and relates to the technical field of electric power systems. The bus residual voltage maintenance device comprises a Rogowski coil, a measurement and control unit, a converter, a switching-off switch, a current limiting impedance, a microcomputer integration protection apparatus and a current transformer. One end of the measurement and control unit is connected with the Rogowski coil, and the other end is connected with one end of the microcomputer integration protection apparatus, one end of the converter, one end of the switching-off switch and one-end of the current limiting impedance. The other end of the microcomputer integration protection apparatus is connected with a current transformer. One end of the current limiting impedance is connected with the switching-off switch, and the other end of the current limiting impedance is connected with the other end of the converter. The bus residual voltage maintenance device can replace a branch circuit breaker and a normal serial current limiting reactor, the current limiting impedance can be rapidly put into use, a residual voltage of a bus rapidly recovers to 95% of a rated voltage, the bus residual voltage is maintained, the continuous operation of important loads is maintained without being affected, and the power supplying quality is improved for the important loads which do not support instantaneous interrupted power supplying and need forced self-starting.
Description
Technical field
The present invention relates to field of power, be specifically related to a kind of bus residual voltage holding device.
background technology
In the electric power system of a certain electric pressure of a lot of enterprises medium voltage networks, if a certain bar branch road is short-circuited, on the bus be connected with this branch road, voltage falls seriously suddenly, bus residual voltage is generally lower than 20% of ear nail definition voltage, only have when this branch breaker cut-offs, excise 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, large about about 0.1 second, the namely time (20ms-30ms) of computer integrated protection failure judgement, add circuit breaker intrinsic operate time (40ms-80ms), adding electric arc zero-crossing timing (about 16ms), busbar voltage outlet depression during this period of time, Enterprise Power System is referred to as " shaking electric "." shake electric " between the emergence period, bus residual voltage is very low, it is the load running interruption of some faults that are not short-circuited, as frequency converter, motor, relay, electromagnetically operated valve etc., these are referred to as sensitive loads to the load of " shaking electric " significant reaction, be characterized in mechanical movement and have the existence of electric energy or magnetic energy energy-storage travelling wave tube, the motor of peculiar interior use 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, bus residual voltage is very low, asynchronous machine on other branch roads can not get reactive power support, and also want short dot output short circuit current, the short circuit time constant of asynchronous machine is at below 30ms, " rolling electricity " 3T around, the magnetic field approach exhaustion of the asynchronous machine of exponentially decaying, after short circuit trouble point excision when voltage resume, electrical network rebuilds to asynchronous machine the impact that magnetic field creates 5-7 times of rated current, protective relaying maloperation is caused to do.
When usual bus remains in below 50%, sensitive loads tolerable " shaking electric " time is not more than 30ms, when foreign network is short-circuited fault, whole for district's Intranet load or part important load can be switched to another foreign network, but certain branch path is short-circuited and just can not entirety have switched in district's Intranet, can only partly switch, if sensitive loads important in district's Intranet people for focusing on minority branch road or other circuitry number are natively few, it is to solve the problem that district's Intranet short circuit causes important load to stop transport that part switches, necessary condition to have the suitable foreign network that can switch, if sensitive loads branch road important in district's Intranet is a lot, the cost that part switches is just too large.
summary of the invention
The object of this invention is to provide a kind of bus residual voltage holding device, it can substitute branch breaker, common series connection current limiting reactor, and can drop into current-limiting impedance fast, the residual voltage of bus is high, can meet maintain important load continue run and unaffected.
For understanding problem existing in background technology; the present invention 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 coil 1, and the other end connects computer integrated protection 6 one end, converter 3 one end, disconnecting switch 4 and current-limiting impedance 5 one end respectively.Another termination current transformer 7 of computer integrated protection 6, current-limiting impedance 5 one termination disconnecting switch 4, another termination converter 3 other end.
Measurement and control unit of the present invention 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 short-circuited in fault 6-16 milliseconds in branch equipment, bus residual voltage is remained on more than 95% of rated voltage, ensure that the normal work of other fault-free sensitive loads, the short-circuit impact suffered by equipment such as main transformer reduces greatly simultaneously, after short trouble D1 in branch path excises, measurement and control unit detection branch electric current close to during rated current immediately to converter order, in 10 milliseconds, current-limiting impedance exits, system can recover normal operation, if be short-circuited, the branch road of fault is being short-circuited more than 300 milliseconds, fault is not removed, then prosecution unit can think the branch path vacuum circuit-breaker tripping of fault point or the busbar fault of branch road, separating brake order is sent immediately to disconnecting switch, excise this branch road.
Bus residual voltage holding device of the present invention, he can substitute branch breaker, common series connection current limiting reactor, current-limiting impedance can be dropped into fast, the residual voltage of bus returns to rapidly rated voltage more than 95%, not only maintain bus residual voltage, can meeting completely and maintain important load and continue to run and unaffected, to not allowing instantaneous interruptedly supplying power must the important load of self-starting by force, can power supply quality be improved.
accompanying drawing explanation
Fig. 1 is electrical schematic diagram of the present invention.
embodiment
See 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 coil 1, and the other end connects computer integrated protection 6 one end, converter 3 one end, disconnecting switch 4 and current-limiting impedance 5 one end respectively.Another termination current transformer 7 of computer integrated protection 6, current-limiting impedance 5 one termination disconnecting switch 4, another termination converter 3 other end.
Measurement and control unit of the present invention 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 short-circuited in fault 6-16 milliseconds in branch equipment, bus residual voltage is remained on more than 95% of rated voltage, ensure that the normal work of other fault-free sensitive loads, the short-circuit impact suffered by equipment such as main transformer reduces greatly simultaneously, after short trouble D1 in branch path excises, measurement and control unit detection branch electric current close to during rated current immediately to converter order, in 10 milliseconds, current-limiting impedance exits, system can recover normal operation, if be short-circuited, the branch road of fault is being short-circuited more than 300 milliseconds, fault is not removed, then prosecution unit can think the branch path vacuum circuit-breaker tripping of fault point or the busbar fault of branch road, separating brake order is sent immediately to disconnecting switch, excise this branch road.
Bus residual voltage holding device of the present invention, he can substitute branch breaker, common series connection current limiting reactor, current-limiting impedance can be dropped into fast, the residual voltage of bus returns to rapidly rated voltage more than 95%, not only maintain bus residual voltage, can meeting completely and maintain important load and continue to run and unaffected, to not allowing instantaneous interruptedly supplying power must the important load of self-starting by force, can power supply quality be improved.
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) termination Rogowski coil (1), and the other end connects computer integrated protection (6) one end, converter (3) one end, disconnecting switch 4 and current-limiting impedance (5) one end respectively; Another termination current transformer (7) of computer integrated protection (6), current-limiting impedance (5) termination disconnecting switch (4), another termination converter (3) other end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410654323.2A CN105098744A (en) | 2014-11-18 | 2014-11-18 | Bus residual voltage maintenance device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410654323.2A CN105098744A (en) | 2014-11-18 | 2014-11-18 | Bus residual voltage maintenance device |
Publications (1)
| Publication Number | Publication Date |
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| CN105098744A true CN105098744A (en) | 2015-11-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN201410654323.2A Pending CN105098744A (en) | 2014-11-18 | 2014-11-18 | Bus residual voltage maintenance device |
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| CN (1) | CN105098744A (en) |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN106207951A (en) * | 2016-08-28 | 2016-12-07 | 安徽普天电力科技有限公司 | The degree of depth current limiting system that a kind of transformator and electromotor share |
| CN106208005A (en) * | 2016-08-28 | 2016-12-07 | 安徽普天电力科技有限公司 | A kind of zero consume degree of depth current-limiting apparatus |
| CN106208004A (en) * | 2016-08-28 | 2016-12-07 | 安徽普天电力科技有限公司 | A kind of momentary power failure can maintain the current-limiting method of voltage |
| CN106208007A (en) * | 2016-08-28 | 2016-12-07 | 安徽普天电力科技有限公司 | The degree of depth current-limiting method that a kind of transformator and electromotor share |
| CN106208008A (en) * | 2016-08-28 | 2016-12-07 | 安徽普天电力科技有限公司 | A kind of important load bus residual voltage keeps system |
| CN106207952A (en) * | 2016-08-28 | 2016-12-07 | 安徽普天电力科技有限公司 | A kind of momentary power failure can maintain the current limiting system of voltage |
| CN106253227A (en) * | 2016-08-28 | 2016-12-21 | 安徽普天电力科技有限公司 | A kind of generator outlet high-pressure side current limiting system |
| CN106300261A (en) * | 2016-08-28 | 2017-01-04 | 安徽普天电力科技有限公司 | A kind of new transformator degree of depth current-limiting method |
| CN106300306A (en) * | 2016-08-28 | 2017-01-04 | 安徽普天电力科技有限公司 | A kind of transformator zero consumes degree of depth current limiting system |
| CN106300305A (en) * | 2016-08-28 | 2017-01-04 | 安徽普天电力科技有限公司 | A kind of zero consume degree of depth current-limiting method |
| CN106300233A (en) * | 2016-08-28 | 2017-01-04 | 安徽普天电力科技有限公司 | A kind of new transformator degree of depth current limiting system |
| CN106329490A (en) * | 2016-08-28 | 2017-01-11 | 安徽普天电力科技有限公司 | Bus residual voltage holding method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202917965U (en) * | 2012-11-20 | 2013-05-01 | 合肥贝阿益电力设备有限公司 | Busbar residual voltage maintaining device |
| CN203278210U (en) * | 2013-01-22 | 2013-11-06 | 合肥隆科电力设备有限责任公司 | Busbar residual voltage maintaining device |
| CN203368013U (en) * | 2013-05-16 | 2013-12-25 | 安徽国科电力设备有限公司 | Protection device for residual voltage of bus |
-
2014
- 2014-11-18 CN CN201410654323.2A patent/CN105098744A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202917965U (en) * | 2012-11-20 | 2013-05-01 | 合肥贝阿益电力设备有限公司 | Busbar residual voltage maintaining device |
| CN203278210U (en) * | 2013-01-22 | 2013-11-06 | 合肥隆科电力设备有限责任公司 | Busbar residual voltage maintaining device |
| CN203368013U (en) * | 2013-05-16 | 2013-12-25 | 安徽国科电力设备有限公司 | Protection device for residual voltage of bus |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN106207951A (en) * | 2016-08-28 | 2016-12-07 | 安徽普天电力科技有限公司 | The degree of depth current limiting system that a kind of transformator and electromotor share |
| CN106208005A (en) * | 2016-08-28 | 2016-12-07 | 安徽普天电力科技有限公司 | A kind of zero consume degree of depth current-limiting apparatus |
| CN106208004A (en) * | 2016-08-28 | 2016-12-07 | 安徽普天电力科技有限公司 | A kind of momentary power failure can maintain the current-limiting method of voltage |
| CN106208007A (en) * | 2016-08-28 | 2016-12-07 | 安徽普天电力科技有限公司 | The degree of depth current-limiting method that a kind of transformator and electromotor share |
| CN106208008A (en) * | 2016-08-28 | 2016-12-07 | 安徽普天电力科技有限公司 | A kind of important load bus residual voltage keeps system |
| CN106207952A (en) * | 2016-08-28 | 2016-12-07 | 安徽普天电力科技有限公司 | A kind of momentary power failure can maintain the current limiting system of voltage |
| CN106253227A (en) * | 2016-08-28 | 2016-12-21 | 安徽普天电力科技有限公司 | A kind of generator outlet high-pressure side current limiting system |
| CN106300261A (en) * | 2016-08-28 | 2017-01-04 | 安徽普天电力科技有限公司 | A kind of new transformator degree of depth current-limiting method |
| CN106300306A (en) * | 2016-08-28 | 2017-01-04 | 安徽普天电力科技有限公司 | A kind of transformator zero consumes degree of depth current limiting system |
| CN106300305A (en) * | 2016-08-28 | 2017-01-04 | 安徽普天电力科技有限公司 | A kind of zero consume degree of depth current-limiting method |
| CN106300233A (en) * | 2016-08-28 | 2017-01-04 | 安徽普天电力科技有限公司 | A kind of new transformator degree of depth current limiting system |
| CN106329490A (en) * | 2016-08-28 | 2017-01-11 | 安徽普天电力科技有限公司 | Bus residual voltage holding method |
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Application publication date: 20151125 |
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