CN2689428Y - Internal electric arc fault detecting protector in switching cabinet - Google Patents
Internal electric arc fault detecting protector in switching cabinet Download PDFInfo
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- CN2689428Y CN2689428Y CN 200420025913 CN200420025913U CN2689428Y CN 2689428 Y CN2689428 Y CN 2689428Y CN 200420025913 CN200420025913 CN 200420025913 CN 200420025913 U CN200420025913 U CN 200420025913U CN 2689428 Y CN2689428 Y CN 2689428Y
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Abstract
Disclosed is an internal electric arc fault detecting protector in switching cabinet, comprising a fiber optic probe, an arc light signal detection cable run, a current mutual inductor, a current detect unit and an accident analysis unit. Arc light signals collected by the fiber optic probe are sent to the arc light signal detection cable run to be treated, and after the treatment, the arc light signals are sent to the accident analysis unit. Simultaneously, the electric arc short circuit electricity detected by the current mutual inductor flows across the current detect unit and then are sent to the accident analysis unit. The accident analysis unit conducts data processing and judgments to the arc light signals of breakdown electric arc and the signals of short-circuit current, and then buckled signals are sent to make the upstream breaker of the breakdown electric arc to be separate. Compared with prior art, the utility model is characterized in high anti-interference capability, big detection range, short response time which needs only 5 ms, high reliability, simple structure and low cost price, etc.
Description
Technical field
The utility model relates to the detection protective device of internal arc fault in a kind of switch cubicle.
Background technology
In recent years; developed the arclight protection system abroad; as: German Moeiier company is used for the fault electric arc protection system ARCON of low-tension switch cabinet; the ARC Guard System fault electric arc protection system of ABB, and the fault electric arc protection system VAMP of being used for of Vaasa electronics corporation, low-tension switch cabinet etc.These systems are based on arc light and the two criterions of sending when detecting arc fault of overcurrent, the bus protection of safety to provide fast, and this provides a kind of effective solution for the restriction arc fault damages.Adopting the protection range of this scheme, be to realize by the physical location of arranging arc photosensor, so its coverage is unrestricted in switch cubicle.In addition, some protection system can also provide fault location information, and this information is for finding the fault point to keep in repair as early as possible, and is most important when restoring electricity as early as possible.
Since the nineties, external increasing electric power and industrial cousumer recognize the harm of arc fault, have adopted above-mentioned these devices or system in switch cubicle.Having influenced it but these devices or system configuration complexity, price are high promotes the use of.
The utility model content
The purpose of this utility model is to sum up both at home and abroad on the basis of some newest fruits aspect the electric arc detecting device, design a kind of economic, practical, simple in structure, detection range big, sensitivity is regulated flexibly, the detection protective device of internal arc fault in the strong interference immunity, action is fast, reliability is high, cost is low switch cubicle.
Realize the detection protective device of internal arc fault in the above-mentioned purpose switch cubicle; comprise that fibre-optical probe is connected in the arc optical signal testing circuit; the fault parameter one tunnel that the output of arc optical signal testing circuit draws through the accident analysis unit is directly sent into protective relaying device; protective relaying device is sent on another road again after sensor parameters optimization; current transformer is connected in current detecting unit, and the output of current detecting unit is connected in the accident analysis unit.
The detection protective device of internal arc fault has strong interference immunity in the switch cubicle of the present utility model, action is fast, highly sensitive, measuring range big, good reliability; be used with small-sized programmable controller EASY, digital protective relay system PA100, PA200 etc.; can survey the arc fault of examining switch cubicle inside effectively; excise electric arc fast, guarantee the safety of electric power system.
The main purpose of arc optical signal detecting unit design is to convert the signal of telecommunication that can control and handle to by the fibre-optical probe collection and by the arc optical signal that optical fiber passes over, the action of the protective relaying device of electricity consumption signal controlling again.Fig. 2 is the collection and the treatment circuit schematic diagram of arc optical signal.The composition of this circuit is; the photodiode negative pole is divided into two-way; one the road is directly connected in operational amplifier input anode, and another road links to each other with operational amplifier input negative terminal with resistance through acquisition module, and operational amplifier output terminal is connected in the voltage comparator that links to each other with protective relaying device through resistance.
Arc optical signal is a current signal by photodiode converts; under the effect of sampling module AR1; become the input in the same way that voltage signal is input to operational amplifier A 1; through amplifying; being sent to the voltage of determining with experiment among the comparator SPR compares; obtain a switching signal, at last this signal is given the action of cut-offfing of protective relaying device RELAY control circuit breaker.
AR1 among Fig. 2 is the sampling module in the signal acquisition circuit, and under the constant situation of arcing current, its parameter of appropriate change just can improve the sampled voltage of sampling end, the sensitivity that has improved arc photosensor accordingly; Under the situation that arcing current changes, arc light intensity changes, and the photodiode output current also changes thereupon, and can improve the sampled voltage of sampling end this moment equally by the parameter of regulating sampling module, reaches the purpose that improves arc photosensor sensitivity.
The operational amplifier A of using among Fig. 21, main effect are not in order to amplify sampled voltage, but in order to improve the input impedance of capture card, reduce output impedance, improve the interference performance of transducer.
The magnitude of voltage that the voltage signal of operational amplifier output is set by comparator and bleeder circuit compares, and the signal that surpasses the comparative voltage of setting will be used as fault-signal, is sent in the relaying protection module by the output port of comparator.Varying in size of arcing current, the size of comparing voltage value is also different, need be determined by experiment.In order to meet the requirements of detection sensitivity, comparative voltage need be as far as possible little in principle, but must assurance misjudgment phenomenon not occur again, and this just need find suitable value in a large amount of experiments.By regulating the resistance of bleeder circuit, just can change the size of comparative voltage, thereby change the sensitivity of arc light checkout gear.
Arc photosensor will be used with protective relaying devices such as Easy and PA100, therefore need to consider the interface problem of transducer and protective relaying device.With 8 road detecting units is example, and (MUX SN74LS251), realizes signal output unique and that be fault for additional encoder (CD4532B) and multi-channel data selector.Its principle as shown in Figure 3.
S0-S7 is 8 road detection signals of comparator output among the figure, is input to simultaneously in priority encoder and the MUX, carries out the geocoding of detection signal respectively and selects output.The effect of priority encoder is that input signal is according to priority encoded in proper order, and the address input end (A, B, C) of MUX is given in the address of output fault-signal.MUX is selected fault-signal output in 8 road detection signals of its input, and its output is decided by the value of its address input end, priority encoder is given the address of address input end fault-signal, has guaranteed it finally is the output of fault signal really in 8 road detection signals.
For easy to maintenance, also considered the orientation problem of fault electric arc.Every cover arc protection device is by a plurality of detections
Description of drawings:
Fig. 1 is the detection protective device composition frame chart of internal arc fault in the switch cubicle.
Fig. 2 is that arc optical signal adopts and the treatment circuit schematic diagram.
Fig. 3 is encoder and MUX connected mode schematic diagram.
Fig. 4 is fault locating and displaying circuit theory diagrams.
Designation among Fig. 1: EASY---small-sized programmable controller; PA100, PA200---digital protective relay system.Designation among Fig. 2: PHOTO---photodiode; ARI---arc signal acquisition module; A1---operational amplifier; SPR---comparator; RELAY---protective relaying device.
Embodiment
As shown in Figure 1, the detection protective device of arc fault is made up of fibre-optical probe, arc optical signal detecting unit, current transformer, current detecting unit and accident analysis unit in the switch cubicle of the present utility model.Fibre-optical probe is delivered to the arc optical signal detecting unit with the light signal that collects, and delivers to the accident analysis unit through the processing of arc optical signal detecting unit; The arc short circuit electric current of current transformer detection is simultaneously delivered to the accident analysis unit through the processing of excessive current detection unit.The accident analysis unit carries out data processing, judgement with arc fault arc optical signal and short circuit current signal, sends trip signal, makes the upstream circuit breaker separating brake of fault electric arc.
Fault electric arc can produce very strong pressure, burning and radiation effect in switch cubicle.Traditional arc light acquisition sensor is directly electrooptical device to be placed the working site mostly, will be sent to higher level's processing unit by the signal of telecommunication that conversion is come by signal transmssion line then.This working method all is suitable in most of occasions.But when arc fault taking place internal pressure will be risen rapidly owing to switch cubicle is interior; to produce strong jammings such as strong magnetic effect, electrical effect, luminous effect and thermal effect simultaneously, the control signal that level is very low is difficult to assurance can also be by such operate as normal of system protection requirement.And, causing the misoperation of higher level's processing unit in case the control signal that the arc light detecting unit is sent owing to strong jamming lost efficacy, its result is unthinkable.
For the ability to work of raising system in adverse circumstances, the fibre-optical probe that adopts the band metal sleeve is as the sensor devices in the switch cubicle, and by optical fiber fault electric arc light is sent to low voltage control compartment in the switch cubicle.Utilize the strong anti-interference ability of optical fiber, make arc optical signal can reach the light-sensitive device end very reliably.Light-sensitive device and follow-up treatment circuit all are positioned over the less relatively low voltage control compartment of interference.
Compare with traditional method for designing that directly photodetector is positioned in the switch cubicle like this, this device has reduced the transmission range of light current control signal, and improved the operational environment of arc photosensor greatly, it has, and antijamming capability is strong, simple in structure, cost is lower, be easy to characteristics such as installation.
The concrete composition of fibre-optical probe is, around the cylindrical jacket layer of one deck, outermost layer is coated by sheath at cylinder bodily form fibre core outer layer ring, and the metal sleeve of being convenient to install and fix is equipped with at two ends.In order to improve the accuracy of sensor arc light, reduce the decay of arc optical signal in the optical fiber, the utility model adopting quartz glass optical fiber.The unit is formed, and the fibre-optical probe of each detecting unit is positioned over the diverse location of switch cubicle respectively.Be example still with 8 road detecting units, 8 road detecting units are carried out the numbering of S0-S7, the address of the fault electric arc of encoder output cooperates charactron to demonstrate numeral or symbol with decoder, from this numeral or symbol just easily the failure judgement signal from which detecting unit, thereby recognize fault electric arc occurs in which position of switch cubicle.Every of diode can show 16 different numerals or alphabetical at most, so every cover arc photosensor can have 16 detecting units at most.Whichsoever arc fault has taken place in detecting unit, and the numeral from diode can directly judge, and overhauls then.8 tunnel fault location display circuits that detect as shown in Figure 4.
The effect of decoder is that 3 codings with the fail address of encoder output are translated into 8 among the figure, drive by turn charactron everybody, everybody light of control charactron.What deserves to be mentioned is that the LT position with the output GS of encoder controls decoder makes when fault-free occurs, everybody is bright entirely for charactron, promptly shows " 8 ", and any one the tunnel when having fault, just show the numeral of 0-7, thereby will have the demonstration with unfaulty conditions to make a distinction.The numeral that charactron shows changes with the address value of input constantly, and fault the back occurs for fear of because the charactron that the disappearance of electric arc causes shows clearly 0, has increased address latch in display circuit.The effect of latch is to guarantee that the fail address demonstration continues, stablizes, its locking Enable Pin (CLK) is by the output E0 control of encoder, guarantee that any one the road breaks down, what its address can both safety is kept in the latch, thus make fault location accurately, reliable.The expansion of coding unit in this circuit (as expanding to 16 with 8) can make detecting unit quantity increase once more, make detection range wider, thereby the protection of switching devices is more abundant.
In sum, this cover arclight checkout gear can be implemented in and selects exactly the fault letter in the multichannel detection signal Number output, make the quantity of detecting unit not be subjected to the quantitative limitation of relay protection module port number. More existing arc light is protected The characteristics such as protection unit, this device have the fault-signal accuracy of judgement, and detection range is big, and is easy to maintenance.
Claims (3)
1, the detection protective device of internal arc fault in a kind of switch cubicle; it is characterized in that; comprise that fibre-optical probe is connected in the arc optical signal testing circuit; the output of arc optical signal testing circuit is connected in the accident analysis unit that links to each other with protective relaying device; the current transformer that detects the arc short circuit electric current is connected in current detecting unit, and the output of current detecting unit is connected in the accident analysis unit.
2, the detection protective device of internal arc fault in the switch cubicle according to claim 1; it is characterized in that; the composition of fibre-optical probe is; at cylinder bodily form fibre core outer layer ring around the cylindrical jacket layer of one deck; coat one deck sheath on cylindrical jacket layer again, the metal sleeve of being convenient to install and fix is equipped with at two ends.
3, the detection protective device of internal arc fault is characterized in that arc optical signal collection and treatment circuit comprise that the photodiode negative pole divides two-way in the switch cubicle according to claim 1 and 2; one the road is directly connected in operational amplifier (A1) input anode; another road links to each other with operational amplifier (A1) input negative terminal with resistance through acquisition module (AR1), and the output of operational amplifier (A1) is connected in the voltage comparator (SPR) that links to each other with relay protection through resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420025913 CN2689428Y (en) | 2004-04-01 | 2004-04-01 | Internal electric arc fault detecting protector in switching cabinet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420025913 CN2689428Y (en) | 2004-04-01 | 2004-04-01 | Internal electric arc fault detecting protector in switching cabinet |
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| Publication Number | Publication Date |
|---|---|
| CN2689428Y true CN2689428Y (en) | 2005-03-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 200420025913 Expired - Fee Related CN2689428Y (en) | 2004-04-01 | 2004-04-01 | Internal electric arc fault detecting protector in switching cabinet |
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| CN (1) | CN2689428Y (en) |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101640406A (en) * | 2008-07-30 | 2010-02-03 | 通用电气公司 | Arc flash detection system, apparatus and method |
| CN101902030A (en) * | 2010-07-14 | 2010-12-01 | 西安交通大学 | Detecting and positioning device of arc fault of switch apparatus |
| CN101916987A (en) * | 2010-08-13 | 2010-12-15 | 保定市尤耐特电气有限公司 | Fast electric arc light protection method |
| CN102025131A (en) * | 2010-12-03 | 2011-04-20 | 铜川供电局 | Arc light monitoring and protecting system |
| CN102646963A (en) * | 2012-04-13 | 2012-08-22 | 山东电力研究院 | Internal fault arc online monitoring and protecting system of distributed multi-point switch cabinet |
| CN103022987A (en) * | 2012-12-25 | 2013-04-03 | 成都星宇节能技术股份有限公司 | Photoelectric arc light protection device |
| CN101682183B (en) * | 2007-05-10 | 2013-04-10 | 默勒有限公司 | Power switch for preventing accidental arcs |
| CN104792409A (en) * | 2015-04-06 | 2015-07-22 | 华中科技大学 | High-power microwave ignition detecting system and high-power microwave ignition detecting method |
| CN107192929A (en) * | 2017-06-21 | 2017-09-22 | 贵州电网有限责任公司电力科学研究院 | The GIS Partial discharge signals source system and application method verified for superfrequency monitoring system |
| CN109141481A (en) * | 2018-09-30 | 2019-01-04 | 广州市捷众智能科技有限公司 | A kind of environmental parameter detection circuit |
| CN109687334A (en) * | 2019-01-01 | 2019-04-26 | 武汉船用电力推进装置研究所（中国船舶重工集团公司第七一二研究所） | A kind of marine medium-voltage power distribution unit |
| CN112394262A (en) * | 2019-08-15 | 2021-02-23 | 西安高压电器研究院有限责任公司 | Arc external effect moment detection device and method |
| CN115980568A (en) * | 2023-03-21 | 2023-04-18 | 浙江大华技术股份有限公司 | Breaker state detection method and device and breaker |
-
2004
- 2004-04-01 CN CN 200420025913 patent/CN2689428Y/en not_active Expired - Fee Related
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101682183B (en) * | 2007-05-10 | 2013-04-10 | 默勒有限公司 | Power switch for preventing accidental arcs |
| CN101640406A (en) * | 2008-07-30 | 2010-02-03 | 通用电气公司 | Arc flash detection system, apparatus and method |
| CN101640406B (en) * | 2008-07-30 | 2015-06-03 | 通用电气公司 | Arc flash detection system, apparatus and method |
| CN101902030A (en) * | 2010-07-14 | 2010-12-01 | 西安交通大学 | Detecting and positioning device of arc fault of switch apparatus |
| CN101916987B (en) * | 2010-08-13 | 2013-09-25 | 保定市尤耐特电气有限公司 | Fast electric arc light protection method |
| CN101916987A (en) * | 2010-08-13 | 2010-12-15 | 保定市尤耐特电气有限公司 | Fast electric arc light protection method |
| CN102025131A (en) * | 2010-12-03 | 2011-04-20 | 铜川供电局 | Arc light monitoring and protecting system |
| CN102646963A (en) * | 2012-04-13 | 2012-08-22 | 山东电力研究院 | Internal fault arc online monitoring and protecting system of distributed multi-point switch cabinet |
| CN103022987A (en) * | 2012-12-25 | 2013-04-03 | 成都星宇节能技术股份有限公司 | Photoelectric arc light protection device |
| CN104792409A (en) * | 2015-04-06 | 2015-07-22 | 华中科技大学 | High-power microwave ignition detecting system and high-power microwave ignition detecting method |
| CN107192929A (en) * | 2017-06-21 | 2017-09-22 | 贵州电网有限责任公司电力科学研究院 | The GIS Partial discharge signals source system and application method verified for superfrequency monitoring system |
| CN107192929B (en) * | 2017-06-21 | 2023-11-03 | 贵州电网有限责任公司电力科学研究院 | GIS partial discharge signal source system for checking ultrahigh frequency monitoring system and use method |
| CN109141481A (en) * | 2018-09-30 | 2019-01-04 | 广州市捷众智能科技有限公司 | A kind of environmental parameter detection circuit |
| CN109687334A (en) * | 2019-01-01 | 2019-04-26 | 武汉船用电力推进装置研究所（中国船舶重工集团公司第七一二研究所） | A kind of marine medium-voltage power distribution unit |
| CN112394262A (en) * | 2019-08-15 | 2021-02-23 | 西安高压电器研究院有限责任公司 | Arc external effect moment detection device and method |
| CN115980568A (en) * | 2023-03-21 | 2023-04-18 | 浙江大华技术股份有限公司 | Breaker state detection method and device and breaker |
| CN115980568B (en) * | 2023-03-21 | 2023-06-13 | 浙江大华技术股份有限公司 | Circuit breaker state detection method and device and circuit breaker |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |