CN102931648A - Bus residual voltage holding device - Google Patents
Bus residual voltage holding device Download PDFInfo
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- CN102931648A CN102931648A CN2012104708034A CN201210470803A CN102931648A CN 102931648 A CN102931648 A CN 102931648A CN 2012104708034 A CN2012104708034 A CN 2012104708034A CN 201210470803 A CN201210470803 A CN 201210470803A CN 102931648 A CN102931648 A CN 102931648A
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- residual voltage
- high impedance
- holding device
- bus residual
- voltage holding
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Abstract
The invention discloses a bus residual voltage holding device which comprises a monitoring and controlling unit, a high-impedance current limiting unit, and a quick converter, a Rogowski coil and a current transformer which are connected with the monitoring and controlling unit respectively; the quick converter is connected with the Rogowski coil in series to form a closed circuit, the closed circuit is connected in parallel with the high-impedance current limiting unit, and the output terminals of the closed circuit and the high-impedance current limiting unit are connected with the input terminal of the current transformer respectively. The bus residual voltage holding device has a simple structure and is low in manufacturing cost, the impedance of the branch circuit with a short circuit fault appearing within 20 milliseconds is increased to more than 20 times total impedance of the correlation system, and the bus residual voltage is restored and maintained to more than 95 percent of the rated voltage; after the bus residual voltage holding device is used, when a short circuit fault occurs in the branch circuit, the bus residual voltage can be quickly restored and maintained.
Description
Technical field
The present invention relates to the branch, short-circuit protective device of medium voltage network, concrete a kind of bus residual voltage holding device.
Background technology
In the electric power system of electric power network medium voltage network or a certain electric pressure of enterprises medium voltage network, if a certain branch road is short-circuited, suddenly fall seriously with voltage on the bus that this branch road links to each other, the voltage of bus remnants (hereinafter referred to as residual voltage) generally is lower than 20% of rated 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 short trouble cut-offs in China's existing circuit breaker (switch) from suddenly dropping to recovery during this period of time; greatly about about 70～100ms; it is the time (10ms-20ms) of computer integrated protection failure judgement; add circuit breaker intrinsic operate time (40ms-60ms), add electric arc zero-crossing timing (about ﹤ 20ms).Busbar voltage depression occurs during this period of time, and Enterprise Power System is referred to as " rolling electricity ".
" rolling electricity " between the emergence period, the bus residual voltage is very low, and the interconnected system load running of some faults that are not short-circuited is interrupted, as: the outage such as frequency converter, electromagnetically operated valve.These loads to " rolling electricity " significant reaction are referred to as sensitive loads, are characterized in mechanical movement and electric energy are arranged or the existence of magnetic energy energy-storage travelling wave tube.
The motor that uses in the 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; the bus residual voltage is very low during certain branch, short-circuit; asynchronous machine on other branch roads can not get reactive power support; and also will be to the short dot output short circuit current; the short circuit time constant τ of asynchronous machine is generally below 30ms; " rolling electricity " be 3 τ 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 is rebuild the impact that magnetic field has produced 5-7 times of rated current to asynchronous machine, causes protective relaying maloperation to do.
The domestic interconnected system failure problems of bringing for solving short trouble at present, use industrial UPS and improve the ancillary techniques such as motor impedance and solve relay and interconnected system load running disruption, but after can't solving trouble shooting starting current to the motor shock problem.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of bus residual voltage holding device, and it is simple in structure, is installed on the branch road of medium voltage network, effectively utilizes Rogowski coil detection branch short-circuit state, in time excises the short circuit part, guarantees the normal use of branch road.
Technical scheme of the present invention is:
A kind of bus residual voltage holding device comprises measurement and control unit, high impedance current limliting unit, and the quick converter that is connected with measurement and control unit respectively, Rogowski coil summation current transformer; Described quick converter is connected with Rogowski coil and is formed path, and path and high impedance current limliting unit are connected in parallel, and the output of the output of described path, high impedance current limliting unit all is connected with the input of current transformer.
Described bus residual voltage holding device also includes the disconnecting switch that is connected with measurement and control unit, described disconnecting switch and high impedance current limliting units in series form the high impedance current-limiting circuit, high impedance current-limiting circuit and described path are connected in parallel, and the output of described high impedance current-limiting circuit is connected with the input of current transformer.
The output of described quick converter is connected with the input of Rogowski coil and is formed path.
The output of described high impedance current limliting unit is connected with the input of disconnecting switch and is formed the high impedance current-limiting circuit.
Electric capacity, resistance or inductance are selected in described high impedance current limliting unit.
Advantage of the present invention:
The present invention is according to Rogowski coil detection branch short-circuit state, during short circuit, make electric current pass through high impedance current limliting unit, limiting short-circuit current, amplitude of short circuit reduces greatly, makes branch equipment in 6～16 milliseconds of the faults of being short-circuited, and the bus residual voltage is remained on more than 95% of rated voltage, guarantee other fault-free branch road sensitive loads normal operations, the suffered short-circuit impacts of equipment such as while main transformer reduce greatly;
The present invention includes the disconnecting switch with high impedance current limliting units in series, when short trouble can't be removed, disconnect the high impedance current-limiting circuit, make electric current can not pass through the high impedance current-limiting circuit, thoroughly cut off branch current, busbar voltage is recovered normally;
Then current transformer Real-time Collection branch current of the present invention is transferred to measurement and control unit, when detection branch electric current during near rated current, measurement and control unit is given quick converter order immediately, and converter is closed fast, the high impedance current-limiting circuit withdraws from, and short circuit branch can be recovered normal operation;
The present invention is simple in structure, cost of manufacture is low, is increased to more than 20 times of interconnected system total impedance at 20 milliseconds with the interior branch impedance that short trouble will occur, the bus residual voltage is recovered and is remained to more than 95% of rated voltage; After using bus residual voltage holding device of the present invention, when being short-circuited fault in the branch road, the bus residual voltage can be recovered rapidly and be maintained.
Description of drawings
Fig. 1 is structural representation of the present invention.
Fig. 2 is mounting structure schematic diagram of the present invention.
Embodiment
See Fig. 1, a kind of bus residual voltage holding device comprises measurement and control unit, high impedance current limliting unit R, and the quick converter ZK, the Rogowski coil LK that are connected with measurement and control unit respectively, disconnecting switch ZJ summation current transformer CT; The output of high impedance current limliting unit R is connected with the input of disconnecting switch ZJ and is formed the high impedance current-limiting circuit, the output of converter ZK is connected with the input of Rogowski coil LK and is formed path fast, high impedance current-limiting circuit and path are connected in parallel, and in the high impedance current-limiting circuit in the output, path of disconnecting switch ZJ the output of Rogowski coil LK all be connected with the input of Current Transmit.
See Fig. 2, the present invention is installed on the branch road, and the input of the input of its high impedance current limliting unit R, quick converter ZK all is connected with bus, and the output of its Current Transmit is connected with branch bar, and wherein, d is short dot.
Use principle of the present invention:
(1), when short circuit appears in branch road, measurement and control unit is by Rogowski coil LK monitoring branch, short-circuit electric current, when short circuit current greater than set point, measurement and control unit sends actuating signal to quick converter ZK, converter ZK disconnects path fast in the 2-3 millisecond fast, the short circuit current change of current enters in the high impedance current-limiting circuit, limiting short-circuit current, amplitude of short circuit reduces greatly, make branch equipment in 6～16 milliseconds of the faults of being short-circuited, the bus residual voltage is remained on more than 95% of rated voltage, guarantee other fault-free branch road sensitive loads normal operations, the suffered short-circuit impacts of equipment such as while main transformer reduce greatly;
(2), after the excision of the short trouble in the branch road, the branch road electrical transmission of Current Transmit Real-time Collection is to measurement and control unit, when branch current during near rated current, measurement and control unit is given quick converter ZK order immediately, converter ZK is closed in 10 milliseconds fast, the high impedance current-limiting circuit withdraws from, and short circuit branch can be recovered normal operation;
(3), the be short-circuited branch road of fault is being short-circuited above 300 milliseconds, fault is not still removed, measurement and control unit is thought the branch road vacuum circuit-breaker tripping of fault point or the busbar fault of branch road according to the collection value judgement of Rogowski coil LK summation current transformer CT, send ON-and OFF-command for immediately disconnecting switch ZJ, thoroughly this branch road of excision makes busbar voltage recover normal.
Claims (5)
1. bus residual voltage holding device is characterized in that: comprise measurement and control unit, high impedance current limliting unit, and the quick converter that is connected with measurement and control unit respectively, Rogowski coil summation current transformer; Described quick converter is connected with Rogowski coil and is formed path, and path and high impedance current limliting unit are connected in parallel, and the output of the output of described path, high impedance current limliting unit all is connected with the input of current transformer.
2. a kind of bus residual voltage holding device according to claim 1, it is characterized in that: described bus residual voltage holding device also includes the disconnecting switch that is connected with measurement and control unit, described disconnecting switch and high impedance current limliting units in series form the high impedance current-limiting circuit, high impedance current-limiting circuit and described path are connected in parallel, and the output of described high impedance current-limiting circuit is connected with the input of current transformer.
3. a kind of bus residual voltage holding device according to claim 1 is characterized in that: the output of described quick converter is connected with the input of Rogowski coil and is formed path.
4. a kind of bus residual voltage holding device according to claim 2 is characterized in that: the output of described high impedance current limliting unit is connected with the input of disconnecting switch and is formed the high impedance current-limiting circuit.
5. a kind of bus residual voltage holding device according to claim 1 and 2, it is characterized in that: electric capacity, resistance or inductance are selected in described high impedance current limliting unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012104708034A CN102931648A (en) | 2012-11-20 | 2012-11-20 | Bus residual voltage holding device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012104708034A CN102931648A (en) | 2012-11-20 | 2012-11-20 | Bus residual voltage holding device |
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| CN102931648A true CN102931648A (en) | 2013-02-13 |
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| CN2012104708034A Pending CN102931648A (en) | 2012-11-20 | 2012-11-20 | Bus residual voltage holding device |
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Cited By (7)
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| CN108448552A (en) * | 2018-04-04 | 2018-08-24 | 国网宁夏电力有限公司中卫供电公司 | A kind of ZLB current-limiting apparatus judged based on electric current |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2556830Y (en) * | 2002-06-06 | 2003-06-18 | 朱洪领 | Short-circuit current combined limiter |
| CN201243191Y (en) * | 2008-08-08 | 2009-05-20 | 安徽赛普电气有限公司 | Large-capacity high-speed current-limiting switch device |
| CN201408976Y (en) * | 2009-05-15 | 2010-02-17 | 郭道胜 | Large-capacity high-speed current limiting switch device |
| CN101702517A (en) * | 2009-12-01 | 2010-05-05 | 宁夏电力公司电力科学研究院 | Energy-saving outdoor grid current limiting device |
| CN201490693U (en) * | 2009-08-06 | 2010-05-26 | 安徽徽电科技股份有限公司 | Large-capacity high-speed current-limiting protection device |
| CN201562957U (en) * | 2009-12-04 | 2010-08-25 | 宁夏电力公司电力科学研究院 | Energy-saving outdoor current limiter of electrical network |
| CN201877816U (en) * | 2010-12-13 | 2011-06-22 | 贵阳铝镁设计研究院 | Short-circuit fault protection circuit of power supply and distribution system |
| US20110267727A1 (en) * | 2010-04-30 | 2011-11-03 | Lsis Co., Ltd. | Apparatus for monitoring fault current in power system |
| 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 |
-
2012
- 2012-11-20 CN CN2012104708034A patent/CN102931648A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2556830Y (en) * | 2002-06-06 | 2003-06-18 | 朱洪领 | Short-circuit current combined limiter |
| CN201243191Y (en) * | 2008-08-08 | 2009-05-20 | 安徽赛普电气有限公司 | Large-capacity high-speed current-limiting switch device |
| CN201408976Y (en) * | 2009-05-15 | 2010-02-17 | 郭道胜 | Large-capacity high-speed current limiting switch device |
| CN201490693U (en) * | 2009-08-06 | 2010-05-26 | 安徽徽电科技股份有限公司 | Large-capacity high-speed current-limiting protection device |
| CN101702517A (en) * | 2009-12-01 | 2010-05-05 | 宁夏电力公司电力科学研究院 | Energy-saving outdoor grid current limiting device |
| CN201562957U (en) * | 2009-12-04 | 2010-08-25 | 宁夏电力公司电力科学研究院 | Energy-saving outdoor current limiter of electrical network |
| US20110267727A1 (en) * | 2010-04-30 | 2011-11-03 | Lsis Co., Ltd. | Apparatus for monitoring fault current in power system |
| CN201877816U (en) * | 2010-12-13 | 2011-06-22 | 贵阳铝镁设计研究院 | Short-circuit fault protection circuit of power supply and distribution system |
| 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 |
Cited By (8)
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| CN108448552A (en) * | 2018-04-04 | 2018-08-24 | 国网宁夏电力有限公司中卫供电公司 | A kind of ZLB current-limiting apparatus judged based on electric current |
| CN108448552B (en) * | 2018-04-04 | 2024-03-08 | 国网宁夏电力有限公司中卫供电公司 | ZLB current limiting device based on current judgment |
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Application publication date: 20130213 |