CN102508128A - Switch cabinet local discharge transient-to-ground voltage detection system based on wireless network - Google Patents
Switch cabinet local discharge transient-to-ground voltage detection system based on wireless network Download PDFInfo
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Abstract
The invention relates to a switch cabinet local discharge transient-to-ground voltage detection system based on a wireless network, which is characterized in that: a signal collection unit is sequentially connected with a transient-to-ground voltage sensor, a filter circuit, an amplification circuit and an analog-to-digital conversion circuit in series, and an output end of the analog-to-digital conversion circuit is connected with a signal transmission unit; the signal transmission unit is provided with a general packet radio service (GPRS) transmitting device and a GPRS receiving device for receiving a signal transmitted by the GPRS transmitting device, a signal input end of the GPRS transmitting device is connected with the analog-to-digital conversion circuit of the signal collection unit, and an output end of the GPRS receiving device is connected with a data collection and analysis unit; the data collection and analysis unit adopts a computer or a high-speed digital signal processor (DSP) chip as a main processor; and a human-machine interface is used for displaying a detection result of the entire system. The switch cabinet local discharge transient-to-ground voltage detection system has high sensitivity of the sensors, can resist the interference, is safe, rapid and accurate to detect, is convenient for working personnel to operate and diagnose, and can realize the local discharge monitoring and location information collection of multiple parts inside a switch cabinet. Discharge fault can be discovered and eliminated in time.
Description
Technical field
The present invention relates to a kind of switch cubicle shelf depreciation transient state voltage-to-ground system; Particularly relate to a kind of through online TEV Partial Discharge Detection; Can monitor the variable condition of the interior local discharging level of switch cubicle of operation at any time; And pass through wireless network transmissions, and then the switch cubicle shelf depreciation transient state voltage-to-ground detection system based on wireless network of switch cubicle local discharge characteristic is described from a plurality of angles to host computer.
Background technology
Electric power is the most important technical foundation of production development and social change; Along with China's rapid development of economy; Power industry, power supply and electricity consumption enterprise automation are built and transform in continuous development perfect; The electric pressure of power equipment is also improving constantly, and people have proposed harsh more requirement to the power equipment operational reliability.
Switch cubicle is a very important electrical equipment in the electric system, and modern power systems requires increasingly highly to the quality of power supply, correspondingly the reliability of switch cubicle is also had higher requirement.The running status of switch cubicle has significant impact to the reliability of electric system.Switch cubicle breaks down, and it is impaired directly to endanger circuit, the equipment protected by electric equipment, electric quantity loss; Indirect harm then is to cause user's large-area power-cuts.Be the reliability of guaranteeing to supply power, power department takes the way of routine test and maintenance to guarantee that switch cubicle normally moves.Yet prophylactic repair has increased the operating cost and the power off time of power equipment, has increased rate of breakdown even, and still has fault to take place at the interval of maintenance.Therefore; Press for switch cubicle is carried out repair based on condition of component; Equipment operation condition is carried out in real time and on-line monitoring regularly,, confirm repair time and measure according to the degradation of equipment running and insulation; Reduce the generation of power off time and accident, improve the safe reliability and the automaticity of Operation of Electric Systems.Simultaneously,, make the running status of switch cubicle carried out on-line monitoring that in time finding potential faults and accumulative total property fault made prediction becomes possibility along with the development of sensor technology, signal processing technology, computer technology, artificial intelligence technology.
Carry out repair based on condition of component equipment is carried out online detection, must analyze the type characteristic of fault, thus the project of definite monitoring.Because switch cubicle is the combination of a plurality of electrical equipments; Its inside relates to multiple physical phenomenons such as electricity, magnetic, temperature; The form of expression and the mechanism of production of fault vary; Therefore to carry out on-line monitoring and make fault judgement and even failure prediction more accurately switch cubicle, must understand the operating characteristic and the fault characteristic of switch cubicle.Switch cubicle has the diversity of element, state and the randomness and the ambiguity of fault.The diversity of element has caused the diversity of failure mode, has a plurality of electrical equipments in the switch cubicle, and different elements has different fault performances.For example, for bus, it is excessive that its fault shows as the contact resistance of junction, thereby cause unusual intensification; For insulated tension pole, its fault shows as decreasing insulating.The diversity of failure mode has been brought difficulty to Selection of Sensor, and selected type of sensor, performance, quantity and installation position will be directly connected to the confidence level of diagnosis.The diversity of switch cabinet state is meant that in different application scenarios, the duty of switch cubicle has very big difference.For example for isolating switch wherein, some isolating switch needs frequent the connection and disjunction, the then action hardly after putting into operation of some isolating switch; Some will repeatedly cut-off short-circuit current in life span, what have then once all need not cut-off.Otherness on this duty has brought difficulty for the on-line monitoring and the fault diagnosis of isolating switch.For example,, can know the ruuning situation of breaker operation mechanism through the stroke curve of moving contact of breaker, if but after isolating switch puts into operation, do not carry out disjunction for a long time and close and close action, then can't obtain stroke curve.Exist between the state variable that randomness that the switch cubicle fault takes place and ambiguity are reflected in switch cubicle and the fault signature variable and become Nonlinear Mapping when complicated and concern: the fault of electrical equipment not only depends on the current state of equipment; Also the historic state with it has relation; Promptly possibly cause by incoherent multiple reason, and possibly cause different faults with a kind of reason with a kind of fault; For same state parameter, fault possibly take place also possibly not take place, and the order of severity of fault also has difference.
Take all factors into consideration the above-mentioned operating characteristic and the fault characteristic of switch cubicle, the project of the main monitoring of switch cabinet state maintenance has temperature monitoring, electric quantity monitoring, vibration monitoring, shelf depreciation (PD-Partial Discgarge) monitoring etc.Temperature monitoring wherein, electric weight detect and vibration monitoring has application to develop into, the more comprehensive stage of function ratio.Since the fifties, launched number of research projects around the partial discharge monitoring technology abroad, successfully multiple technologies have been applied in the Partial Discharge Detection of transformer, they are neutral point coupling monitoring, rf monitoring, PDA monitoring etc.And the domestic research that is placed on aspect the line monitoring in office starts late, and develops also slower.Though much more existing up till now cover partial discharge monitoring systems come into operation, theory is imperfection very still, a difficult problem that much needs to be resolved hurrily in addition.
The loose contact that the defective of switch cubicle built-in electrical insulation part or deterioration, conductive connection part divide all can make safe operation be on the hazard.According to national electric system 6～10kV switch cubicle accident statistics in the period of 1989～1992, insulation accounts for 40.2% of sum with the fault that current-carrying causes, wherein since the accident that the flashover of insulated part causes account for insulation fault total 79.0%.And because the accident that the stab contact loose contact causes accounts for 71.1% of current-carrying total number of accident.It is thus clear that the shared ratio of fault that is caused by insulation and loose contact is very high, should take appropriate method to monitor.Under above-mentioned situation; A lot of insulation defects are in progressively development; The final dielectric breakdown that forms the phenomenon that shelf depreciation constantly develops and strengthens all can occur in accident, so through the on-line monitoring to switch cubicle PD signal latent period; Carry out fault diagnosis, significant to the generation and the realization repair based on condition of component that prevent accident.Say that technically the partial discharge monitoring system of present domestic development can be divided into arrowband and broadband system.Narrowband systems is only played a game, and to put serious spark discharge of later stage relatively more responsive, and can not distinguish the source of discharge signal.It is abundant more that information is put in the office of the wide more collection of broadband system, bandwidth, but also high more to the requirement of system: it also is crucial requiring to have higher sampling rate and digital place ability, the discriminating of disturbing on the other hand on the one hand.Monitoring system is put in existing office, no matter adopts any method, can not realize that all office accurately locatees in the source of putting in the switch cubicle.Existing measurement of partial discharge and evaluation criteria be just to the net assessment of electrical equipment, and it is very big that the position influence of source in equipment put in its measured value office of receiving.Only put under the condition of position in known office, apparatus insulated net assessment just has higher confidence level and actual value, thus office to put the accurate location in source extremely important, the research of partial discharge positioning method is had important scientific meaning and practical value.
At present, office's localization method of putting the source mainly contains electrical Location method, ultrasonic locating method and rf ultrasound's ripple co-located method.These methods all have certain advantage, but in theory still can't solve the multipoint positioning problem.
In addition, localization method is put in existing office, no matter is the electrical Location method, or ultrasonic locating method and rf ultrasound's ripple co-located method, all need the signal that each sensor provides be transferred to data processing centre (DPC) through corresponding wire cable.Use this wired sensor to have many shortcomings: 1. because the monitoring that needs are located in the switch cubicle is counted more; A plurality of sensors need be installed in switch cubicle; A large amount of cables are drawn very difficulty, have not only increased wiring cost, also might cause the switch cubicle insulation damages; 2. As time goes on, the operative sensor in the switch cubicle inevitably can take place aging or break down, and this can cause the loss of monitoring parameter; 3. after general monitoring system has designed, increase, adjust relatively difficulty of sensor, the change of sensor configuration might need to revise the system software source program.These drawbacks limit of wired sensor the development of switch cabinet state monitoring.
TEV is called the transient state voltage-to-ground again, is at first proposed by Dr John Reeves in 1974.When shelf depreciation takes place in the metallic shield inside of non-closure; Discharge can produce a large amount of high-frequency electromagnetic wave impulses; Because the propagation characteristic of frequency electromagnetic waves, will along the inside surface of metallic shield to around propagate, when the place, slit of electromagnetic wave propagation to metallic shield; Just spread out of by the slit, finally import ground electrode into through ground wire.During through metallic shield surperficial, with inspiring an instantaneous magnitude of voltage from the teeth outwards, this voltage is transient state voltage-to-ground (TEV) at this high-frequency electromagnetic signal.Through discovering, in this voltage signal and the metallic shield shelf depreciation strong and weak and, there is direct contact the position of discharge.Therefore, can through judge whether there is shelf depreciation in the switch cubicle for the detection of this TEV signal.
GPRS is the abbreviation of general packet radio service (General Packet Radio Service); Be that a kind of packet-switched data that on GSM global system for mobile communications network foundation, grows up carries and transmission mode, in embedded system, use very extensive.Along with reaching its maturity of China Mobile's GPRS network construction, the coverage rate in area surpasses 90%, and the GPRS signal has reached the non-blind area covering basically.GPRS belongs to packet-switch technology, has real-time online, charges by flow, fast lands, transfer rate is high, support IP agreement and characteristics such as agreement X.25.
Summary of the invention
Technical matters to be solved by this invention is; Provide a kind of and can promptly utilize TEV sensor and wireless sensor network technology thereof, shelf depreciation in the switch cubicle is carried out the switch cubicle shelf depreciation transient state voltage-to-ground detection system based on wireless network of on-line monitoring and location.
The technical scheme that the present invention adopted is: a kind of switch cubicle shelf depreciation transient state voltage-to-ground detection system based on wireless network comprises: signal gathering unit, signal transmission unit, data acquisition and the analytic unit and the man-machine interface that are connected in series successively, wherein,
Signal gathering unit comprises transient state voltage-to-ground sensor, filtering circuit, amplifying circuit and the analog to digital conversion circuit of serial connection successively in order to obtain local discharge signal, and the output terminal of described analog to digital conversion circuit connects signal transmission unit;
Signal transmission unit carries out long-distance transmissions; Include GPRS emitter and the GPRS receiving trap that receives GPRS emitter signal; The signal input part of described GPRS emitter connects the analog to digital conversion circuit of signal gathering unit, and the output terminal of described GPRS receiving trap connects data acquisition and analytic unit;
Data acquisition and analytic unit are used to gather the shelf depreciation data and analyze, judge and store, and adopt computing machine or high-speed dsp chip as primary processor;
Man-machine interface is used to show the testing result of total system.
Described transient state voltage-to-ground sensor is provided with a plurality of, and wherein the spacing of whenever adjacent two sensors is more than or equal to 60cm.
Described analog to digital conversion circuit adopts high frequency A/D conversion chip.
The outside employing of described transient state voltage-to-ground sensor metallic shield.
Described data acquisition and analytic unit also are provided with the network service port.
Switch cubicle shelf depreciation transient state voltage-to-ground detection system based on wireless network of the present invention has following characteristics:
(1) transient state voltage-to-ground (TEV) sensor directly is placed on the switch board housing of ground connection, solves that used transducer sensitivity in the present partial discharge monitoring is low, the shortcoming of serious interference; Can on switch board housing, settle numerous sensor, and these sensors are formed network, each sensor node cooperates with each other and accomplishes multipoint data acquisition task jointly, realizes the partial discharge monitoring and the locating information acquisition of multi-section position in the switch cubicle.
(2) adopt wireless transmission method between TEV sensor and the processing terminal, and good isolation is arranged between the high voltage installation, the safety of equipment and survey crew can be guaranteed; Simultaneously, do not exist in toe-in fruit and off-line result's equivalence problem.
(3) wireless sensor network node allows certain failure rate, in case sensor failure is arranged, network is networking again automatically, thereby monitoring system can be worked incessantly.
(4) network node has certain computing power and storage capacity.Can carry out pre-service to data, this is that the traditional sensors network can't be realized.Can reduce data quantity transmitted on the one hand, save node energy, prolong network life; On the other hand, the data volume that is transferred to data processing centre (DPC) significantly reduces.
(5) part of nodes of network can move, and topological structure has dynamic.Because sensor node switches between work and sleep state; Perhaps the operative sensor node moves; And sensor node possibly lose efficacy owing to a variety of causes breaks down at any time; These make that all the topologies change of wireless sensor network is very fast, and wireless sensor network can adapt to this dynamic of network topology structure through agreement.
(6) upper computer analyzing software is powerful, comprises database and analysis module, can consult historical information and analyze local discharge characteristic from all angles, the row mode of going forward side by side identification.
(7) fully digitalization shows, the interface is more directly perceived, succinct, complete function.
(8) compare with existing detection technique; The present invention detects safety, rapid, accurate; Be convenient to the staff and operate diagnosis; The strong and weak detection of shelf depreciation in employing T transient state voltage-to-ground method can realize switch cubicle under live state detects when can realize numerous switch cabinet state through collection result being wirelessly transmitted to data analysis unit, accomplishes the timely discovery and the eliminating of discharge fault.
Description of drawings
Fig. 1 is a system architecture synoptic diagram of the present invention;
Fig. 2 is sensor outward appearance signal of the present invention.
Wherein:
1: signal gathering unit 2: signal transmission unit
3: data acquisition and analytic unit 4: man-machine interface
11: transient state voltage-to-ground sensor 12: filtering circuit
13: amplifying circuit 14: analog to digital conversion circuit
15: metallic shield 21:GPRS emitter
22:GPRS receiving trap 31: data acquisition
32: data analysis 33: network service
41: data storage 42: show
43: parameter setting 44: report to the police
Embodiment
Provide specific embodiment below in conjunction with accompanying drawing, further specify the switch cubicle shelf depreciation transient state voltage-to-ground detection system based on wireless network of the present invention and how to realize.
Fundamental purpose of the present invention is through online TEV Partial Discharge Detection; Realize detecting in real time the state variation of local discharging level in the switch cubicle that moves; From a plurality of angles the switch cubicle local discharge characteristic is described, the dielectric properties of research switch cubicle built-in electrical insulation part.The object of the invention can reach through following measure: a kind of switch cubicle shelf depreciation TEV detection system based on wireless network is provided; Be that detection system is put in a kind of wireless office based on emerging ZigBee technology, and utilize ripe GPRS network realize the switch cubicle shelf depreciation in real time, dynamic monitoring.
Fig. 1 is system architecture synoptic diagram of the present invention, and is as shown in Figure 1, and the switch cubicle shelf depreciation transient state voltage-to-ground detection system based on wireless network of the present invention can be used for 10kV and above electric pressure switch cubicle Partial Discharge Detection.Comprise: signal gathering unit 1, signal transmission unit 2, data acquisition and the analytic unit 3 and the man-machine interface 4 that are connected in series successively.Wherein,
Signal gathering unit 1 is in order to obtain local discharge signal; Comprise transient state voltage-to-ground (TEV) sensor 11, filtering circuit 12, amplifying circuit 13 and the analog to digital conversion circuit 14 of serial connection successively, the output terminal of described analog to digital conversion circuit 14 connects signal transmission unit 2; Described transient state voltage-to-ground sensor 11 is provided with a plurality of, and wherein the spacing of whenever adjacent two sensors is more than or equal to 60cm.Described transient state voltage-to-ground sensor 11 is as shown in Figure 2, adopts capacitive transducer, and signal is drawn two leads 16,17 by two lateral electrodes, and externally adopts metallic shield 15, to avoid external disturbance.It is the high frequency A/D conversion chip of AD9481 that described analog to digital conversion circuit 14 adopts model.
In when, in the switch cubicle shelf depreciation taking place when; On switch board housing, can produce corresponding TEV signal; This TEV voltage signal can detect and send into filter amplification circuit by the TEV sensor; The undesired signal that here need filter out is that power frequency is disturbed and extraneous signal such as FM radio signal etc., and signal gets into amplifying circuit and carries out distortionless amplification after filtering, transfer to analog to digital conversion circuit then and convert digital signal into; Because the high frequency characteristics of TEV signal, so need to use high frequency A/D conversion chip.This unit adopts n road probe to detect simultaneously, is convenient to grasp the shelf depreciation situation of each switch cubicle.The employing high pass circuit at a few megahertz to tens megahertzes, is effectively avoided undesired signal, in order to obtain local discharge signal with band setting.
Signal transmission unit 2 carries out long-distance transmissions; Include GPRS emitter 21 and the GPRS receiving trap 22 that receives GPRS emitter 21 signals; The signal input part of described GPRS emitter 21 connects the analog to digital conversion circuit 14 of signal gathering unit 1, and the output terminal of described GPRS receiving trap 22 connects data acquisition and analytic unit 3;
The conversion of signals that measures is an input GPRS emitter after the digital signal, propagates through GPRS network, and long-distance transmissions gets into the next stage treatment circuit then to the GPRS receiving trap, i.e. data acquisition and analytic unit 3.
Data acquisition and analytic unit 3 are used to gather the shelf depreciation data and analyze, store, and the shelf depreciation state in the switch cubicle is made judgement, and the result who analyzes is sent to follow-up unit.Adopt computing machine or high-speed dsp chip as primary processor; Concrete grammar is to utilize the high-speed dsp chip as primary processor, receive the digital signal of previous stage after, the TEV pulse number is measured and calculated to amplitude to received signal.Size and umber of pulse with measured TEV signal value serve as according to the power of judging shelf depreciation in the switch cubicle.Described data acquisition and analytic unit 3 also are provided with network service port 33, can carry out Network Transmission to monitoring result in case of necessity, realize Long-distance Control and diagnosis, in time understand the shelf depreciation situation of tested switch cubicle.
Man-machine interface 4 is used to show the testing result of total system.The testing result that shows total system intuitively comprises whether shelf depreciation exists, local discharge signal power etc., and reference is provided for the operations staff.The staff realizes related setting, operation for the shelf depreciation system through this interface.Concrete grammar is to adopt the high-brightness LED screen that the end value of DSP output is shown intuitively, and data presented is: pulse number etc. in the relative amplitude of pulse voltage (dB is a unit), measuring period; Man-machine interface is provided with button, can control equipment, comprises measurement, Protection Counter Functions.
Power supply adopts the built-in lithium battery power supply, and the signal of avoiding adopting external power source to cause disturbs.
Switch cubicle shelf depreciation transient state voltage-to-ground detection system based on wireless network of the present invention, concrete environment for use and method thereof are following.
1, environment for use
Sea level elevation :≤1000m.
Working temperature :-20 ℃-40 ℃
Working relative humidity: 0-90%, no condensation
No fire, explosion danger, pollution severity chemical corrosion, high vibration, strong electromagnetic and thunderbolt place equipment under test are wanted good earth
Storing temperature: 0-50 ℃
2, method of application
(1) Partial Discharge Detection.The present invention utilizes the TEV sensor to be attached on the switch board housing of ground connection and detects; When in the switch cubicle shelf depreciation taking place, the TEV signal on TEV sensor acquisition switch cubicle surface is handled through filter amplification circuit again; Draw initialize signal; Initialize signal becomes digital signal through analog to digital conversion, and transfers to the GPRS module, through GPRS network data is sent to remote monitoring center; Surveillance center also can use active mode to send TEV shelf depreciation acquisition and give the GPRS module on the other hand.Surveillance center provides the discharge monitoring of switch cubicle TEV portion, the analysis software based on the VB exploitation, software is integrated data configuration, data acquisition, data monitoring and back-stage management function.Data transmission is to Surveillance center; Through the characteristic quantity of analyzing, statistical computation goes out shelf depreciation; Distinguish the characteristic of shelf depreciation: the PHASE DISTRIBUTION figure that draws the partial discharge quantity of the different local discharge characteristics of multiple expression respectively; The discharge capacity distribution plan, the PHASE DISTRIBUTION figure of discharge time and their temporal variations, the row mode of going forward side by side identification.
(2) shelf depreciation point location.When using the present invention to carry out the shelf depreciation location, must not be for the spacing of the status requirement two sensors of sensor less than 60cm.Concrete method of application is: sensor network is placed the switch cubicle surface; The sensor TEV signal value that shows through the terminal compares; The position of the sensor distance point of discharge that the TEV signal value is higher is near more; When the TEV signal value that shows when two sensors is identical, explain that then point of discharge is between two sensors.Can orient the position of shelf depreciation point in the switch cubicle through the method, for maintenance provides reference.
Claims (5)
1. the switch cubicle shelf depreciation transient state voltage-to-ground detection system based on wireless network is characterized in that, comprising: signal gathering unit (1), signal transmission unit (2), data acquisition and the analytic unit (3) and the man-machine interface (4) that are connected in series successively, wherein,
Signal gathering unit (1) is in order to obtain local discharge signal; Comprise transient state voltage-to-ground sensor (11), filtering circuit (12), amplifying circuit (13) and the analog to digital conversion circuit (14) of serial connection successively, the output terminal of described analog to digital conversion circuit (14) connects signal transmission unit (2);
Signal transmission unit (2) carries out long-distance transmissions; Include the GPRS receiving trap (22) of GPRS emitter (21) and reception GPRS emitter (21) signal; The signal input part of described GPRS emitter (21) connects the analog to digital conversion circuit (14) of signal gathering unit (1), and the output terminal of described GPRS receiving trap (22) connects data acquisition and analytic unit (3);
Data acquisition and analytic unit (3) are used to gather the shelf depreciation data and analyze, judge and store, and adopt computing machine or high-speed dsp chip as primary processor;
Man-machine interface (4) is used to show the testing result of total system.
2. the switch cubicle shelf depreciation transient state voltage-to-ground detection system based on wireless network according to claim 1; It is characterized in that; Described transient state voltage-to-ground sensor (11) is provided with a plurality of, and wherein the spacing of whenever adjacent two sensors is more than or equal to 60cm.
3. the switch cubicle shelf depreciation transient state voltage-to-ground detection system based on wireless network according to claim 1 is characterized in that, described analog to digital conversion circuit (14) adopts high frequency A/D conversion chip.
4. the switch cubicle shelf depreciation transient state voltage-to-ground detection system based on wireless network according to claim 1 is characterized in that, the outside employing of described transient state voltage-to-ground sensor (11) metallic shield.
5. the switch cubicle shelf depreciation transient state voltage-to-ground detection system based on wireless network according to claim 1 is characterized in that described data acquisition and analytic unit (3) also are provided with network service port (33).
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| CN108680843A (en) * | 2018-08-21 | 2018-10-19 | 广西电网有限责任公司电力科学研究院 | A kind of method for detection of partial discharge of switch cabinet based on Radio Transmission Technology |
| CN109507549A (en) * | 2018-11-16 | 2019-03-22 | 天津大学 | Partial discharge of switchgear based on wireless network monitors system |
| CN109884489A (en) * | 2019-02-18 | 2019-06-14 | 上海金艺检测技术有限公司 | For switchgear the ad hoc network sensing device of electric wave |
| CN109828189A (en) * | 2019-02-19 | 2019-05-31 | 福建聚实新能源科技有限公司 | Partial discharge on-Line Monitor Device, system and method based on ubiquitous electric power Internet of Things |
| CN110501617A (en) * | 2019-07-11 | 2019-11-26 | 特斯联（北京）科技有限公司 | A kind of partial discharge of switchgear detection system and method |
| CN110988622A (en) * | 2019-11-29 | 2020-04-10 | 河南省恒华电力设备有限公司 | High tension switchgear partial discharge monitoring and early warning system |
| CN111856224A (en) * | 2020-06-29 | 2020-10-30 | 国网河南省电力公司周口供电公司 | Partial discharge multi-source fusion detection system and method for high-voltage switch cabinet |
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