CN104868455A - Bus residual voltage maintaining device - Google Patents
Bus residual voltage maintaining device Download PDFInfo
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- CN104868455A CN104868455A CN201510289194.6A CN201510289194A CN104868455A CN 104868455 A CN104868455 A CN 104868455A CN 201510289194 A CN201510289194 A CN 201510289194A CN 104868455 A CN104868455 A CN 104868455A
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- limiting impedance
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- 238000005259 measurement Methods 0.000 claims abstract description 12
- 230000001012 protector Effects 0.000 abstract 3
- 238000001514 detection method Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
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Abstract
The invention provides a bus residual voltage maintaining device, and relates to the technical field of an electric system. The bus residual voltage maintaining device comprises a Rogowski coil, a measurement and control unit, a transverter, a disconnecting switch, a current-limiting impedance unit, 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 connected with a terminal of the microcomputer comprehensive protector, a terminal of the transverter, the disconnecting switch and a terminal of the current-limiting impedance unit; 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 disconnecting switch, and the other terminal of the current-limiting impedance is connected with the other terminal of the transverter. The bus residual voltage maintaining device can replace a branch breaker and a common serial-connected current limiting reactor, and trigger the current limiting impedance rapidly; and a residual voltage of a bus is recovered up to more than 95% of a rated voltage rapidly, so the bus residual voltage maintaining device can not only maintain the residual voltage of the bus, 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 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 |
|---|---|---|---|
| CN201510289194.6A CN104868455A (en) | 2015-06-01 | 2015-06-01 | Bus residual voltage maintaining device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510289194.6A CN104868455A (en) | 2015-06-01 | 2015-06-01 | Bus residual voltage maintaining device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104868455A true CN104868455A (en) | 2015-08-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510289194.6A Pending CN104868455A (en) | 2015-06-01 | 2015-06-01 | Bus residual voltage maintaining device |
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| Country | Link |
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| CN (1) | CN104868455A (en) |
Cited By (2)
| 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 |
| CN116247627A (en) * | 2022-11-23 | 2023-06-09 | 国网浙江省电力有限公司嘉善县供电公司 | Power distribution network voltage sag bus voltage maintaining system and method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012023524A1 (en) * | 2010-08-20 | 2012-02-23 | 株式会社 東芝 | Magnetizing inrush current suppression device |
| CN102931648A (en) * | 2012-11-20 | 2013-02-13 | 合肥贝阿益电力设备有限公司 | Bus residual voltage holding 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 |
-
2015
- 2015-06-01 CN CN201510289194.6A patent/CN104868455A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012023524A1 (en) * | 2010-08-20 | 2012-02-23 | 株式会社 東芝 | Magnetizing inrush current suppression device |
| CN102931648A (en) * | 2012-11-20 | 2013-02-13 | 合肥贝阿益电力设备有限公司 | Bus residual voltage holding 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 |
Cited By (2)
| 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 |
| CN116247627A (en) * | 2022-11-23 | 2023-06-09 | 国网浙江省电力有限公司嘉善县供电公司 | Power distribution network voltage sag bus voltage maintaining system and method |
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| C06 | Publication | ||
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| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20150826 |
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| RJ01 | Rejection of invention patent application after publication |