CN1554930A - Optical signal collecting and on-line monitoring method for electric power equipment internal failure - Google Patents
Optical signal collecting and on-line monitoring method for electric power equipment internal failure Download PDFInfo
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- CN1554930A CN1554930A CNA2003101194576A CN200310119457A CN1554930A CN 1554930 A CN1554930 A CN 1554930A CN A2003101194576 A CNA2003101194576 A CN A2003101194576A CN 200310119457 A CN200310119457 A CN 200310119457A CN 1554930 A CN1554930 A CN 1554930A
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Abstract
The light signal the fault part inside closed electric power equipment produces is acquired with optical fiber, signal distinguished and amplified in the signal distinguishing and amplifying circuit to separate discharge signal and/or overheat signal; and the type, degree and position of the fault inside the equipment are judged in the signal processing circuit based on the signal type, size and distribution. The said method is simple, practical, accurate and reliable, and may be used in the in-situ monitoring of main transformer equipment.
Description
Technical field:
The invention belongs to power equipment detection technique field, further relate to the on-line monitoring of power equipment internal faults under running status such as airtight transformer and switch.
Background technology:
Grasping the also timely discovering device internal fault of power equipment running state is to guarantee the essential condition of power grid security.At present, mostly existing on-line monitoring method is that to gather electric signal, acoustical signal and medium analyte signal serve as according to realizing on-line monitoring.Because power equipment is operated in high voltage, strong-electromagnetic field and than the big bang noise circumstance, the discharge pulse electric signal that fault produces usually is difficult to accurately separate from the interference of complexity with acoustical signal, so causes checkout equipment complexity and poor reliability; And the detection of medium analyte exists the result to lag behind, weakness such as the poor stability that works online for a long time.Therefore, seek accurately and reliably, the equipment failure on-line monitoring method of simple and direct practicality is the active demand of power industry development both at home and abroad in recent years.
Because monitored equipment mostly is air-tight state greatly, inside is unglazed during normal the operation, and just have when having only inner structure to break down light to produce, and therefore the light signal that the trouble spot is produced is as acquisition target, and the monitoring equipment operation has directly reliable, interference-free characteristics.Document was put down in writing to gather the device of optical monitoring signal discharge fault, but this device can not be distinguished into detected light signal the light signal of overheating fault generation and the light signal that discharge fault produces, therefore when light signal generating, do not judge fault type, be diagnosed as discharge fault simply and mistake can occur, and judge that according to the signal quantity that records the power of discharge fault also can produce erroneous judgement, because producing measurement result probably, disturbs the light signal that overheating fault produces.
The main embodiment of power equipment internal fault is overheating fault and discharge fault, the reason of overheating fault is loose contact or overload, and cause high temperature because of resistance heat, and send near infrared ray, red even orange visible light appear when serious, the wavelength of these light claims that all greater than 0.59um (micron) this light signal is overheated light signal; And the reason of the discharge fault unbalanced dielectric breakdown that causes that is defective insulation or field strength distribution, supervene electrical discharge arc or corona, certainly exist visible light (yellow, green, blue or green, blue, purple) and the near ultraviolet ray of wavelength less than 0.59um in the spectrum of electric arc or corona, wavelength is called the discharging light signal less than visible light and the near ultraviolet ray of 0.59um.Therefore, tell the wavelength coverage of light signal, get final product the tracing trouble type, the failure judgement reason has important practical usage to device security and operational management.
Summary of the invention:
The collection and the on-line monitoring method that the purpose of this invention is to provide a kind of power equipment internal fault light signal, realization is to airtight power equipment more reliable, more timely and more practical on-line monitoring under running status, and accurate tracing trouble type, failure judgement degree and analysis of failure produce the position when fault-signal occurs.Method of the present invention is to realize by following step:
(1) hinder the light signal of generation for some reason with collecting fiber Sealing Arrangement inside: with fiber arrangement in equipment, optic fibre input end is easily sent out the zone towards fault, receive the light signal that the trouble spot produces, to device external, fiber-optic output connects signal identification and amplifying circuit to light signal through fiber optic conduction;
(2) convert the light signal that collects to electric signal and distinguish the discharging light signal and/or overheated light signal: the fiber-optic output of gathering light signal connects signal identification and amplifying circuit, signal identification and amplifying circuit are made up of photo-electric conversion element and operational amplifier, and the spectrum sensitive peak value of the photo-electric conversion element of identification discharge signal is in visible light and the near ultraviolet ray zone of wavelength less than 0.59um; The spectrum sensitive peak value of the photo-electric conversion element of identification heat alarm is at visible light and the near infrared range of wavelength greater than 0.59um; After light signal converts electric signal to, export to signal processing circuit through amplification;
(3) signal processing circuit tracing trouble and output result: signal identification and amplification circuit output end connect the signal processing circuit input end, signal processing circuit is made up of the PLC Programmable Logic Controller, signal to input carries out mould/number conversion, numerical value contrast, logic analysis and storage, according to the characteristics of signals tracing trouble of signal identification and amplifying circuit output and export the result.
The invention advantage:
1, because light signal is not disturbed by high voltage and strong-electromagnetic field, and no near infrared ray, visible light and ultraviolet ray in the Sealing Arrangement of normal operation, therefore the light signal that occurs by collecting fiber Sealing Arrangement internal cause fault comes failure judgement to have accurate, reliable, instant characteristics, is difficult for producing mistake and surveys.
2, with collecting fiber to light signal can distinguish heat alarm and discharge signal by signal identification and amplifying circuit, so accurate tracing trouble type of energy, and can judge the degree of all kinds of faults according to signal quantity, testing result is practical, and equipment safety operation is had great importance.
3, can realize determining of trouble location.The light signal of the collecting fiber that multiple spot is distributed carries out big or small contrast can determine that fault occurs near the strongest optic fibre input end of signal, determines that trouble location is to further analyzing failure cause with accurately maintenance is significant.
4, the output with signal processing circuit links to each other with circuit breaking protective system, when discharge signal surpasses certain intensity, starts power-off protection.The relay protecting method that this is new is compared with existing gas relay guard method, can improve reaction velocity greatly, reduces equipment damage, improves the security level of equipment.
5, with the output of signal processing circuit with after power system network links to each other, can realize the remote monitoring operational outfit, at shortest time reflection equipment state and fault type, size and generation position.
6, this method is simple, practical, cost is low, be easy to popularization.
Description of drawings:
Fig. 1 has represented the step block diagram of the method for the invention, is made up of monitored power equipment 1, optical fiber (group) 2, signal identification and amplifying circuit (group) 3, signal processing circuit 4;
Fig. 2 is the circuit diagram of cell signal identification and amplifying circuit;
Fig. 3 is the signal processing circuit block diagram.
Embodiment:
Step 1, hinder the light signal of generation for some reason with collecting fiber Sealing Arrangement inside: arrange optical fiber (group) 2 in advance in airtight power equipment 1 inside, especially select for use near infrared ray is arrived the silica fibre that near ultraviolet ray wavelength region may light transmission is good and insulating property are good, the silica fibre oversheath adopts temperature resistant capability to reach more than 100 ℃, (as transformer oil) steady in a long-term and polytetrafluoroethylmaterial material or epoxide resin material good insulation preformance in insulating medium, allow the input end face of optical fiber to the monitored site, but arrange that as required each fault of the optical fibre set monitoring equipment inside that many optical fiber are formed easily sends out the position.For improving the effect of optical fiber receiving optical signals, can before input end, increase lens, as the hemisphere face lens are connected optic fibre input end.Optical fiber is guided to device external, enters in the device that airtight signal identification and amplifying circuit are housed.
Step 2, convert the light signal that collects to electric signal and distinguish the discharging light signal and overheated light signal: in the device that signal identification and amplifying circuit are housed, the output termination signal of optical fiber (group) 2 discern and amplifying circuit (group) 3 in photo-electric conversion element.Cell signal identification and amplifying circuit are made up of photo-electric conversion element and operational amplifier as shown in Figure 2.Every optical fiber can connect a plurality of cell signal identifications and amplifying circuit by optical splitter, and one of them is used to detect the discharging light signal, and other is used to detect overheated light signal or/and the light signal sum total.With this light signal is divided into the signal of discharge signal and heat alarm or other particular requirement, after amplifying, exports to signal processing circuit independently of one another again.
The photo-electric conversion element of sensed light signal has following selection:
(1), the photomultiplier of emission of cathode type, highly sensitive, cost is also high.
(2), the light activated element of semi-conductor type such as light resistance, photodiode, triode, photoelectric cell etc., cheap, rationally coupling also can meet the demands.
The typical photo-electric conversion element combination of distinguishing discharge fault and overheating fault has two kinds:
1), adopt wavelength response peak below 0.59um Se photovoltaic detector (photoelectric cell) or the silicon blue light volt detector (photoelectric cell) that has a filter detect the discharging light signal; Adopt wavelength response peak to exist
0.59um above silicon photovoltaic detector (photoelectric cell) detects overheated light signal, realizes signal distinguishing by the peak value contrast.
2), adopt spectral response range to detect the discharging light signal at the Cs-Te of 0.27-0.43um type photomultiplier (ultraviolet detector); Adopt spectral response range to detect overheated light signal at the photomultiplier of 0.47-1.1um.
After light signal is converted to electric signal, amplifies and export to signal processing circuit 4 through the amplifying circuit (as operational amplifier) of routine.The enlargement factor of operational amplifier and quantity are determined as required.
Step 3, signal processing circuit tracing trouble and output result: the output terminal of each cell signal identification and amplifying circuit 3 all connects the input end of signal processing circuit 4, signal processing circuit is according to the signal type tracing trouble type of signal identification and amplifying circuit output, according to signal quantity failure judgement degree, position and signal quantity contrast according to the optical fiber input point that collects light signal determine that fault produces the position, exports signal processing results.Result output comprises that fault alarm, power-off protection, image show, data are surfed the Net, the result prints.The signal processing circuit block diagram is a main body by the PLC controller as shown in Figure 3, comprises the conversion of input signal and the output device of result.The simulating signal of input is arrived the PLC control module through the A/D conversion, and the PLC controller is finished numerical value contrast, logic analysis and storage etc. and is handled back output result.The data of PLC output also can be transferred to PC, realize bigger memory space and abundanter interface display and control function.
Signal processing circuit is finished following work:
1) judges that the signal receive is discharge signal or heat alarm, when the discharge signal that has wavelength to be not more than the visible light of 0.59um and near ultraviolet ray when the signal identification that receives discharge signal and amplifying circuit occurs, be judged as discharge fault; When the discharge off signal occurs and when receiving the signal identification of heat alarm and amplifying circuit and having wavelength to occur greater than the visible light of 0.59um and near infrared heat alarm, is judged as overheating fault.With discharge signal and the contrast of predefined discharge alerting signal critical value, send discharge fault when surpassing and report to the police; With discharge signal and the contrast of predefined power-off protection signal critical value, send the power-off protection enabling signal when surpassing.With heat alarm and the contrast of predefined temperature alarm critical value, send overheating fault when surpassing and report to the police.
2) show the various fault-signal sizes of each optical fiber acceptance point, and generate the graph of a relation picture of signal quantity and generation time, the strong more corresponding fault of signal is serious more.The record of storage failure period.
3) contrast the uniformity signal size, show or/and the happening part of all kinds of faults is judged with this in the position of the heat alarm input point of the position of the discharge signal input point of printing maximum and maximum.
4) print analysis result, detect data to the grid transmission.
Signal that every optical fiber of the present invention connects identification and amplifying circuit quantity also are applicable to the light that adopts a photo-electric conversion element only to detect particular range of wavelengths.As: only connect cell signal identification and amplifying circuit 3 at every fiber-optic output, wherein photo-electric conversion element adopts silicon photocell to receive and transmitting photo-signal, after amplification and signal Processing, also can realize effectively monitoring fault and definite fault and produce the position, and circuit reduction, but can not effectively realize the fault type diagnosis.
Number of fibers of the present invention determines that according to quantity that is subjected to the monitoring point in the equipment and complexity simple device can adopt one.
The present invention is applicable to power equipments such as the transformer, reactor, shunting switch, isolating switch, mutual inductor, GIS combined electrical apparatus of oil-insulation, gas-insulated and vacuum insulation.
Claims (6)
1, power equipment internal fault light signal collection and on-line monitoring method, its step is as follows:
(1) hinder the light signal of generation for some reason with collecting fiber Sealing Arrangement inside: with fiber arrangement in equipment, optic fibre input end is easily sent out the zone towards fault, receive the light signal that the trouble spot produces, to device external, fiber-optic output connects signal identification and amplifying circuit to light signal through fiber optic conduction;
(2) convert the light signal that collects to electric signal and distinguish the discharging light signal and/or overheated light signal: the fiber-optic output of gathering light signal connects signal identification and amplifying circuit, signal identification and amplifying circuit are made up of photo-electric conversion element and operational amplifier, and the spectrum sensitive peak value of the photo-electric conversion element of identification discharge signal is in visible light and the near ultraviolet ray zone of wavelength less than 0.59um; The spectrum sensitive peak value of the photo-electric conversion element of identification heat alarm is at visible light and the near infrared range of wavelength greater than 0.59um; After light signal converts electric signal to, export to signal processing circuit through amplification;
(3) signal processing circuit tracing trouble and output result: signal identification and amplification circuit output end connect the signal processing circuit input end, signal processing circuit is made up of the PLC Programmable Logic Controller, signal to input carries out mould/number conversion, numerical value contrast, logic analysis and storage, according to the characteristics of signals tracing trouble of signal identification and amplifying circuit output and export the result.
2, according to right 1 described power equipment internal fault light signal collection and on-line monitoring method, the tracing trouble of its feature in step (3) and output result are signal processing circuits according to the signal type tracing trouble type of signal identification and amplifying circuit output and export fault alarm and fault type shows: promptly when wavelength occurs less than the discharge signal of the visible light of 0.59um and near ultraviolet ray, be diagnosed as discharge fault, the output discharge fault is reported to the police; When having only wavelength greater than the visible light of 0.59um and near infrared heat alarm, be diagnosed as overheating fault, the output overheating fault is reported to the police.
3, according to right 1 described power equipment internal fault light signal collection and on-line monitoring method, the tracing trouble of its feature in step (3) and output result are signal processing circuits according to the signal quantity failure judgement degree of signal identification and amplifying circuit output and export the fault degree diagnostic result: the big more fault that is judged to of signal quantity is serious more, prints the discharge value or/and show discharge value and time relationship image.
4, according to right 1 described power equipment internal fault light signal collection and on-line monitoring method, the tracing trouble of its feature in step (3) and output result are that signal processing circuit produces the position and exports the trouble location diagnostic result according to signal source and signal magnitude tracing trouble: each collection point signal power of contrast optical fiber, judge that fault produces the position near the strongest optic fibre input end of signal, print result is or/and show position of failure point.
5, according to right 1 described power equipment internal fault light signal collection and on-line monitoring method, its feature is in step (3), and signal processing circuit is with the result data online that obtains.
6, according to right 1 described power equipment internal fault light signal collection and on-line monitoring method, its feature is in step (3), when the starting outfit power-off protection wavelength appears less than the discharging light signal of 0.59um and when reaching certain value, in the light signal that records.
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| CNB2003101194576A CN100385212C (en) | 2003-12-24 | 2003-12-24 | Optical signal collecting and on-line monitoring method for electric power equipment internal failure |
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| CNB2003101194576A CN100385212C (en) | 2003-12-24 | 2003-12-24 | Optical signal collecting and on-line monitoring method for electric power equipment internal failure |
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Cited By (14)
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| CN101782632B (en) * | 2010-02-02 | 2012-01-11 | 青岛海信网络科技股份有限公司 | Testing system for optical feedback faults of signal lamp terminal |
| CN102840917A (en) * | 2012-08-29 | 2012-12-26 | 山东电力集团公司淄博供电公司 | Transmission and distribution electromagnetic spectrum joint detector |
| CN102879630A (en) * | 2012-09-17 | 2013-01-16 | 浙江省电力公司电力科学研究院 | Capacitive voltage transformer failure monitoring instrument |
| CN101753207B (en) * | 2008-12-16 | 2013-08-28 | 华为技术有限公司 | Fiber link fault recognition method, device and system |
| CN105004522A (en) * | 2015-07-15 | 2015-10-28 | 上海电机学院 | Blower fan shaft system fault diagnosing and state monitoring system based on optical signal |
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| CN109085470A (en) * | 2018-08-03 | 2018-12-25 | 珠海知更电气有限公司 | A kind of arc light sensor device and equipment health status judgment method |
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| CN113267724A (en) * | 2021-06-30 | 2021-08-17 | 国网江苏省电力有限公司电力科学研究院 | On-load tap-changer on-line monitoring system of transformer |
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| JPS6253421A (en) * | 1985-08-27 | 1987-03-09 | Mitsubishi Rayon Co Ltd | Production of pitch based carbon fiber |
| US5550629A (en) * | 1994-03-17 | 1996-08-27 | A R T Group Inc | Method and apparatus for optically monitoring an electrical generator |
| US6229680B1 (en) * | 1999-08-16 | 2001-05-08 | Eaton Corporation | Apparatus and method for optically detecting arcing faults in electric power systems in the presence of other light sources |
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2003
- 2003-12-24 CN CNB2003101194576A patent/CN100385212C/en not_active Expired - Fee Related
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| CN101753207B (en) * | 2008-12-16 | 2013-08-28 | 华为技术有限公司 | Fiber link fault recognition method, device and system |
| CN101782632B (en) * | 2010-02-02 | 2012-01-11 | 青岛海信网络科技股份有限公司 | Testing system for optical feedback faults of signal lamp terminal |
| CN102840917A (en) * | 2012-08-29 | 2012-12-26 | 山东电力集团公司淄博供电公司 | Transmission and distribution electromagnetic spectrum joint detector |
| CN102879630A (en) * | 2012-09-17 | 2013-01-16 | 浙江省电力公司电力科学研究院 | Capacitive voltage transformer failure monitoring instrument |
| CN105004522A (en) * | 2015-07-15 | 2015-10-28 | 上海电机学院 | Blower fan shaft system fault diagnosing and state monitoring system based on optical signal |
| CN105004522B (en) * | 2015-07-15 | 2017-10-27 | 上海电机学院 | Blower fan shaft system fault diagnosis and condition monitoring system based on optical signal |
| CN106679809A (en) * | 2017-02-24 | 2017-05-17 | 三峡大学 | Ring network cabinet fault distinguishing system based on optical spectrum analysis method |
| CN107907217A (en) * | 2017-11-11 | 2018-04-13 | 成都市龙泉星源机械厂 | A kind of Novel welder transformer On-line Fault monitoring system and monitoring method |
| CN108169734A (en) * | 2017-12-07 | 2018-06-15 | 国网山东省电力公司烟台供电公司 | A kind of method of locating terminal and system based under fiber mode |
| CN109085470A (en) * | 2018-08-03 | 2018-12-25 | 珠海知更电气有限公司 | A kind of arc light sensor device and equipment health status judgment method |
| CN109085470B (en) * | 2018-08-03 | 2021-12-21 | 珠海知更电气有限公司 | Arc light sensing device and equipment health condition judgment method |
| CN110888027A (en) * | 2019-12-03 | 2020-03-17 | 深圳供电局有限公司 | Sensor for detecting discharge of ring main unit |
| CN114694274A (en) * | 2020-12-30 | 2022-07-01 | 中核控制***工程有限公司 | Automatic inspection system and method for nuclear power plant |
| CN113109675A (en) * | 2021-04-12 | 2021-07-13 | 西北核技术研究所 | Image diagnosis device and method for insulation stack vacuum surface flashover |
| CN113109675B (en) * | 2021-04-12 | 2024-06-11 | 西北核技术研究所 | Image diagnosis device and method for insulating stack vacuum surface flashover |
| CN113267724A (en) * | 2021-06-30 | 2021-08-17 | 国网江苏省电力有限公司电力科学研究院 | On-load tap-changer on-line monitoring system of transformer |
| CN113267724B (en) * | 2021-06-30 | 2023-03-07 | 国网江苏省电力有限公司电力科学研究院 | On-load tap-changer on-line monitoring system of transformer |
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