CN202533545U - Power transmission network fault detection system based on internet of things technology - Google Patents

Power transmission network fault detection system based on internet of things technology Download PDF

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Publication number
CN202533545U
CN202533545U CN2012201537710U CN201220153771U CN202533545U CN 202533545 U CN202533545 U CN 202533545U CN 2012201537710 U CN2012201537710 U CN 2012201537710U CN 201220153771 U CN201220153771 U CN 201220153771U CN 202533545 U CN202533545 U CN 202533545U
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module
fault
circuit
voltage
signal
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王铮
王珮
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CHANGSHU DYNASTY INFORMATION TECHNOLOGY Co Ltd
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Priority to CN2012101066030A priority patent/CN103376387A/en
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04SSYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S10/00Systems supporting electrical power generation, transmission or distribution
    • Y04S10/50Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
    • Y04S10/52Outage or fault management, e.g. fault detection or location

Abstract

The utility model relates to a power transmission network fault detection system and method based on an internet of things technology, characterized in that by utilizing a three-phase zero sequence voltage and current balance measurement method, the voltage and current variation of a high voltage transmission line three-phase fixed point are real-timely on-line monitored whether to be balanced, and according to the voltage and current variation characteristics under various statuses, the three-phase fixed point of a high-voltage overhead line is judged whether to have abnormity. The power transmission network fault detection system based on the internet of things technology comprises grounding, circuit break and short circuit fault diagnoses, and enables the fault detection level to be improved; wherein the short circuit fault alarm accuracy can reach more than 98.5%, and the grounding fault alarm accuracy can reach more than 97%. A detecting device possesses a self-learning function, namely, a plurality of threshold values do not need to be set according to the transmission lines of different loads, so that the workload before putting the detecting device into use is reduced, the versatility is improved, the power cut range is reduced, the power cut time is shortened, and the power supply reliability is improved substantially.

Description

Power transmission network fault detection system based on technology of Internet of things
Technical field
The utility model belongs to electric system emergency communication, distribution automation, intelligent grid field and communication technical field, is specifically related to a kind of power transmission network fault detection system based on technology of Internet of things.
Background technology
The mode of distribution wire short trouble signals collecting mainly relies on when short trouble occurring at present; Over-current phenomenon avoidance will appear in electric line; Utilize preposition current sensor to obtain signal; Carry out again importing main control unit after a series of processing and amplifying, thereby judge whether to break down with the threshold that pre-sets.Promptly ought obtain signal value just thinks greater than setting threshold short trouble has taken place.Yet since built on stilts electric line everywhere working load be not quite similar; So the electric signal power of obtaining from electric line is also different; This just needs to cooperate with power department in advance, understands the load condition of each bar transmission line of electricity, thereby sets different threshold values to satisfy the needs of actual conditions; Because the workload before the existence of this situation just makes pick-up unit come into operation improves greatly, and versatility is poor.In view of the fault detect means that failure detector adopted that occur on the market at present have certain limitation, this paper proposes a kind of short trouble testing circuit based on jump-value of current, realizes the detection of fault.
The power transmission network fault diagnosis is the prerequisite of carrying out accident treatment, when power transmission network breaks down, has a large amount of warning messages and pours in control center.Because the existing fault indicator do not have the open circuit fault decision-making function basically, consider the influence of opening circuit for the normal power supply of circuit, native system adds the open circuit fault measuring ability.This characteristic of circuit sudden power behind the open circuit fault occurs according to overhead transmission line, this paper designs the break-make situation that a circuit on-off testing circuit detects electric system in each bar circuit in real time, thereby judges open circuit fault whether occurs, avoids the generation of accident.
Existing measure theory is that detection single-phase voltage or electric current judge it is the earth fault short trouble, and the error of this method is very big, especially judges ground connection, and accuracy rate has only about 30%.
Existing method just adopts simple electronic circuit technology, does not have data transmission and analytical technology, takes place on-the-spot in fault; When curtage breaks down; Moving indicating mechanism is inhaled in magnetic field, makes fault detector turn to red position, after fault is got rid of; Need telltale reset is arrived white, need personnel to search at the scene.
Summary of the invention
Power transmission network fault diagnosis system and diagnostic method that the purpose of the utility model provides a kind of easy enforcement, locatees fast based on technology of Internet of things; The variation of real time on-line monitoring three-phase electricity voltage and current; It is no abnormal to judge that hi-line has, and this system can improve the malfunction monitoring level.
For realizing goal of the invention; Technical solution of the present invention is: utilize three-phase residual voltage and current balance type mensuration; Whether the variation of the voltage and current of real time on-line monitoring high voltage transmission line three-phase point of fixity balance, according to the variation characteristic of voltage and current under the various situations, judges that this point of high-tension overhead line has no abnormal; Native system comprises ground connection, opens circuit and the short trouble diagnosis, specifically comprises the steps:
(1) hangs on fault detect terminal on three power transmission lines of high pressure, power transmission network running status and environmental parameter are monitored, obtain real time data;
(2) pick-up unit is through " self study " function, and the electric signal under the record normal operating conditions is set to self decision threshold;
Electric signal and self threshold of (3) gathering every circuit in real time judge that whether circuit is unusual, issues machine tool with failure message through the near radio transport module;
(4) machine tool receives the fault-signal of handset, failure judgement type;
(5) failure message is sent on control center or the maintainer's mobile phone.
In order to realize said method, another purpose of the utility model provides a kind of power transmission network fault detection system based on technology of Internet of things, and this system comprises control center's monitoring module, the fault detect terminal.
Control center's monitoring module comprises host computer indicating fault interface, is used for the physical location and the fault type of indication fault.
The fault detect terminal comprises two handsets, a machine tool.Handset comprises micro controller module, signal acquisition module, fault detection module, warning indication, power module, near radio transport module.Machine tool also comprises long distance wireless transport modules such as GSM mobile handset module, 3G module and GPRS module except that all modules that comprise handset.
Micro controller module by high-performance enhancement mode single-chip microcomputer as control core; The voltage and current of monitoring power transmission line three-phase point of fixity changes in real time; Variation characteristic according to voltage and current under the various situations; Analysis draws circuit ruuning situation, and the transient fault that the detection at any time circuit takes place has guaranteed the reliability that the terminal is detected.
Signal acquisition module comprises sensor, first follow circuit 1, second follow circuit 2, voltage comparison module.Wherein sensor is formed by the hollow coiled wire-wound coil coiling of cylindricality, through the current signal of this coil-induced overhead transmission line primary side, as sensor input signal.First follow circuit, 1 receiving sensor input current signal, and can follow the variation of input signal rapidly and change.Current signal when second follow circuit 2 passes through " self study " Function detection to operate as normal; Convert this current signal into voltage signal; And write down the reference value of this signal as voltage comparison module; When sensor input signal changed, this reference value kept the magnitude of voltage in a moment within a certain period of time, can not undergo mutation.Voltage comparison module receives first follow circuit 1 and second follow circuit, 2 two paths of signals; And compare in real time; When the moment of input voltage generation saltus step; Can produce voltage difference on the voltage comparison module, the pulse that output has certain time-delay is with the detection signal output of this pulse as micro controller module.
Fault detection module comprises short trouble testing circuit, grounded inspection circuit, broken circuit detection circuit, has judged whether fault according to the signal that collects, and sends fault-signal.
The near radio transport module is used for the information transmission between handset and the machine tool, and the long distance wireless transport module is used for the data transmission between machine tool and Surveillance center and the maintainer's mobile phone.
Compared with prior art, the remarkable advantage of the utility model is:
(1), the utility model can improve the malfunction monitoring level, wherein short trouble warning accuracy rate can reach more than 98.5%, earth fault warning accuracy rate can reach more than 97%.
(2), pick-up unit has " self study " function, promptly a plurality of threshold values need be set according to the power transmission line of each bar different load, alleviated the workload before pick-up unit comes into operation, and improved versatility.
(3), the utility model is based on technology such as Internet of Things, wireless telecommunications, information networks; Circuit is taked real-time monitoring, indicate feeder line fault rapidly, indicate appearance, branch and the section of guilty culprit for the track walker; Exempted blindly line walking of maintainer; Make the investigation of fault become convenient efficient, not only reduced the power failure scope but also shortened power off time, improved the reliability of power supply greatly.
Description of drawings
Fig. 1 is the utility model overhead power transmission line monitoring system structural drawing.
Fig. 2 is the utility model fault detect terminal structure block diagram.
Fig. 3 is the utility model phase fault testing circuit theory diagram.
Fig. 4 is the utility model broken circuit detection circuit schematic diagram.
Fig. 5 is the utility model system failure processing flow chart.
Fig. 6 is the utility model embodiment 1 detection system phase fault synoptic diagram.
Fig. 7 is the utility model embodiment 2 detection system singlephase earth fault synoptic diagram.
Embodiment
Below in conjunction with accompanying drawing and embodiment the utility model is done further explanation:
The system architecture of the utility model is as shown in Figure 1, and system comprises a plurality of fault detects terminal and control center's monitoring module.
The fault detect terminal is become with two sub-units by machine tool, and machine tool and two handsets hang on respectively on three power transmission lines of high pressure.Two sub-facility have same structure, and are as shown in Figure 2, comprise signal acquisition module, fault detection module, and micro controller module, the indication of reporting to the police, power module, near radio transport module, machine tool comprise all structures of handset, also comprise the long distance wireless transport module.Whether the power transmission line of two sub-machine testing self suspensions has fault, and failure message is passed to machine tool through the near radio transport module.Native system near radio transport module can be selected wireless radio frequency modules or wireless ZIGBEE module.Machine tool detects the transmission line fault information that self hangs, and receives the failure message that two handsets are sent simultaneously, and comprehensive failure judgement is also distinguished fault type, sends on maintainer's mobile phone failure message and remote monitoring center through the long distance wireless transport module.Native system long distance wireless transport module can be selected the GSM mobile handset module, and GPRS and 3G module realize remote information transmission through the mobile base station.
Signal acquisition module is as shown in Figure 3, comprises the sensor load module, first follow circuit, 1, the second follow circuit 2, voltage comparison module.Sensor signal output two-way wherein, the one tunnel connects that first follow circuit 1, a tunnel connects second follow circuit, 2, the first follow circuits 1 and second follow circuit 2 is connected to voltage comparison module, and voltage comparison module is exported and is connect the MCU detection port.Sensor is formed by the hollow coiled wire-wound coil coiling of cylindricality, through the current signal of this coil-induced overhead transmission line primary side, as sensor input signal.First follow circuit, 1 receiving sensor input current signal, and can follow the variation of input signal rapidly and change.Current signal when second follow circuit 2 passes through " self study " Function detection to operate as normal; Convert this current signal into voltage signal; And write down the reference value of this signal as voltage comparison module; When sensor input signal changed, this reference value kept the magnitude of voltage in a moment within a certain period of time, can not undergo mutation.Voltage comparison module receives first follow circuit 1 and second follow circuit, 2 two paths of signals; And compare in real time; When the moment of input voltage generation saltus step; Can produce voltage difference on the voltage comparison module, the pulse that output has certain time-delay is with the detection signal output of this pulse as micro controller module.
Fault detection module comprises phase fault testing circuit, singlephase earth fault testing circuit, open circuit fault testing circuit.Wherein the open circuit fault testing circuit is as shown in Figure 4; Sensor input signal passes through to get into the LM334 constant current source after diode D1 rectification, current-limiting resistance R1, filter capacitor C1, the voltage stabilizing diode D2 voltage stabilizing; Feedback resistance R2 is set makes its output current for back level photoelectrical coupler 6N139 input is provided; Photoelectrical coupler 6N139 output terminal is received power supply through pull-up resistor R3, connects the MCU detection port simultaneously.
The utility model power module is used for can adopting solar powered mode or lithium battery power supply mode to the native system power supply.
The concrete method of work of native system failure judgement is as shown in Figure 5,
The determination methods of phase fault: can make after short trouble produces to occur overcurrent in the circuit suddenly and the duration is no more than 4 seconds, protective relaying device starts after the fault, and switch trip makes circuit be in power down mode.According to failure mechanism, the fault detect flow process of the present invention's design is following: the signal that fault detection module receives signal acquisition module begins to get into the judgement flow process, judges whether electric current has sudden change; If not sudden change, circuit is normal, if sudden change is arranged; Delay time and judge after 4 seconds whether line current voltage is 0, if be not 0, circuit is normal; Current break is to cause by disturbing to wait, if line current voltage is 0, is judged as phase fault.
The determination methods of singlephase earth fault: according to the failure mechanism of singlephase earth fault, grounded phase wire voltage declines to a great extent suddenly, and non-fault phase line voltage increases, and produces harmonic wave; The grounded phase wire electric current is undergone mutation and is produced harmonic wave, but not sudden change can not appear in fault phase line current, and still is in power supply state in the circuit.The present invention adopts following judgement earth fault flow process: the signal that fault detection module receives signal acquisition module begins to get into the judgement flow process, judges whether voltage has sudden change, if not sudden change, circuit is normal; If sudden change is arranged, judge that voltage is to raise or reduction, if voltage raises, delay time and judged whether voltage still raises in 4 seconds; If do not raise, finish to judge, if voltage raises; Judge whether voltage 5 order harmonic components become greatly,, finish to judge if do not become big; If 5 order harmonic components become to judge whether circuit is in power supply state greatly,, finish to judge not at power supply state; Ifs circuit is still supplied power, and is judged as the non-fault phase that singlephase earth fault takes place, and judges and finishes.If voltage reduces, delay time and judged whether voltage still reduces in 4 seconds, if do not have, finish to judge with low; If still reduce, judge whether electric current 5 order harmonic components become greatly, if do not become big, finish to judge; If 5 order harmonic components become to judge whether circuit is in power supply state greatly,, finish to judge not at power supply state; Ifs circuit is still supplied power, and is judged as the fault phase that singlephase earth fault takes place, and judges and finishes.
The determination methods of open circuit fault: the signal that fault detection module receives signal acquisition module begins to get into the judgement flow process, judges whether voltage has sudden change, if not sudden change, circuit is normal; If sudden change is arranged, judge whether electric current has sudden change, if not sudden change; Continue to judge whether voltage suddenlys change, if electric current has sudden change, whether the 4 seconds decision circuitry electric current and voltages of delaying time are 0; If be not 0, circuit is normal, finishes to judge; If electric current and voltage is 0, the failure judgement type is an open circuit fault, judges and finishes.
Embodiment 1, phase fault are handled
Fault detection system is hung on the overhead transmission line operation; As shown in Figure 6; First handset 1, second handset 3, first machine tool 2 are formed first sense terminals, 1, the three handset 4, the 4th handset 6, second machine tool 5 and are formed second sense terminals, 2, the five handsets 7, the 6th handset 9, the 3rd machine tool 8 and form the 3rd sense terminals 3; First handset 1, first machine tool 2, second handset 3 detect No. 2 line A, B, C three phase transmission line respectively; The 3rd handset 4, the 5th handset 7 detect a branch road A phase lines, and second machine tool 5, the 3rd machine tool 8 detect a branch road B phase lines, and the 4th handset 6, the 6th handset 9 detect a branch road C phase lines.When phase fault takes place mutually for B, C two between No. 2 line branch road a second sense terminals 2 and the 3rd sense terminals 3; First sense terminals 1 before the trouble spot, second sense terminals 2 all detect short trouble, and promptly first machine tool 2, second machine tool 5, first handset 3, second handset 6 detect fault-signal, and through LED lamp indication fault information; For example: circuit has fault; The LED lamp is shown in red, and circuit is normal, and the LED lamp is shown in green.The LED malfunction indicator lamp of present embodiment first machine tool 2, second machine tool 5, first handset 3, second handset 6 is shown in red, and sends warning message by first machine tool 2, second machine tool 5.
Embodiment 2, singlephase earth fault are handled
Fault monitoring system is hung on the overhead transmission line operation; When singlephase earth fault occurring, as shown in Figure 7, first handset 1, second handset 3, first machine tool 2 are formed first sense terminals 1; The 3rd handset 4, the 4th handset 6, second machine tool 5 are formed second sense terminals 2; Form the 5th handset 7, the 6th handset 9, the 3rd machine tool 8 the 3rd sense terminals 3, the first handsets 1, first machine tool 2, second handset 3 detect No. 2 line A, B, C three phase transmission line respectively, and the 3rd handset 4, the 5th handset 7 detect a branch road A phase lines; Second machine tool 5, the 3rd machine tool 8 detect a branch road B phase lines, and the 4th handset 6, the 6th handset 9 detect a branch road C phase lines.Singlephase earth fault takes place in C mutually between No. 2 line a branch road second sense terminals 2 and the 3rd sense terminals 3; Second handset 3, the 4th handset 6 for before the faulty line trouble spot detect fault; And detected failure message passed to first machine tool 2, second machine tool 5, send failure messages on failure monitoring center and maintainer's mobile phone by first machine tool 2, second machine tool 5.Second handset 3, the 4th handset 6 fault-signal LED lamps are shown in red.
Embodiment 3, open circuit fault are handled
This characteristic of circuit sudden power behind the open circuit fault occurs according to overhead transmission line, the present invention designs the break-make situation that a circuit on-off testing circuit detects electric system in each bar circuit in real time, judges open circuit fault whether to occur.The open circuit fault decision circuitry is as shown in Figure 4: sensor input signal passes through to get into the LM334 constant current source after diode D1 rectification, current-limiting resistance R1, filter capacitor C1, the voltage stabilizing diode D2 voltage stabilizing; Feedback resistance R2 is set makes its output current for back level photoelectrical coupler 6N139 input is provided; Photoelectrical coupler 6N139 output terminal is received power supply through pull-up resistor R3, connects the MCU detection port simultaneously.Under the situation of the normal operation of circuit, constant current source has input signal all the time, and ability driven photoelectrical coupler 6N139 makes the output terminal of photoelectrical coupler 6N139 be always low level; When circuit generation open circuit fault; Sensor is not exported signal; Can't input signal be provided for constant current source LM334; Photoelectrical coupler 6N13 output terminal becomes high level, and the MCU detection port detects optocoupler 6N139, and to be output as high level be that open circuit fault has appearred in the decidable overhead transmission line, and failure message is sent to machine tool through wireless communication module; Machine tool sends to remote monitoring center and maintainer's mobile phone through the long distance wireless transport module with failure message, thereby avoids the further expansion of accident to cause more serious disaster.
Embodiment 4, control center's monitoring module show failure message
Control center's monitoring module receives failure message, shows corresponding failure message at monitoring interface, and the distribution figure that monitoring interface is made according to electric system distribution center indicates; Each sense terminals is made unique numbering, corresponding with the physical location of electric wiring, line failure; The host computer interface is at corresponding position display failure message, and for example: redness is a short trouble, and blueness is an open circuit fault; Yellow is an earth fault, and green is a normal condition.

Claims (5)

1. power transmission network fault detection system based on technology of Internet of things; It is characterized in that said system comprises control center's monitoring module and fault detect terminal; Said fault detect terminal comprises two handsets, a machine tool; Described handset comprises micro controller module, signal acquisition module, fault detection module, warning indication, power module and near radio transport module, and described machine tool also comprises the long distance wireless transport module except that all modules that comprise handset.
2. the power transmission network fault detection system based on technology of Internet of things according to claim 1 is characterized in that described fault detection module comprises short trouble testing circuit, grounded inspection circuit and broken circuit detection circuit.
3. the power transmission network fault detection system based on technology of Internet of things according to claim 1; It is characterized in that described signal acquisition module comprises sensor; First follow circuit (1), second follow circuit (2), voltage comparison module; Wherein said sensor is formed by the hollow coiled wire-wound coil coiling of cylindricality, through the current signal of this coil-induced overhead transmission line primary side, as sensor input signal; First follow circuit (1) receiving sensor input current signal, and follow the variation of input signal and change; Current signal when second follow circuit (2) passes through " self study " Function detection to operate as normal converts this current signal into voltage signal, and writes down the reference value of this signal as voltage comparison module; Voltage comparison module receives first follow circuit (1) and second follow circuit (2) two paths of signals; And compare in real time; When the moment of input voltage generation saltus step; Produce voltage difference on the voltage comparison module, output has the pulse of time-delay, with the detection signal output of this pulse as micro controller module.
4. the power transmission network fault detection system based on technology of Internet of things according to claim 1; It is characterized in that described near radio transport module is used for the information transmission between handset and the machine tool, the long distance wireless transport module is used for the data transmission between machine tool and Surveillance center and the maintainer's mobile phone; Described micro controller module by high-performance enhancement mode single-chip microcomputer as control core.
5. the power transmission network fault detection system based on technology of Internet of things according to claim 1 is characterized in that described control center monitoring module comprises host computer indicating fault interface, is used for the physical location and the fault type of indication fault.
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CN103235263A (en) * 2013-05-06 2013-08-07 中国矿业大学 Online monitoring and fault diagnosing system of motor based on internet of things
CN103513161A (en) * 2013-09-27 2014-01-15 孙双春 Power transmission and transformation system fault searching locating instrument and searching method
CN103575995A (en) * 2012-07-31 2014-02-12 施耐德电器工业公司 Detection system for detecting impedance variation in a neutral conductor, and transformer station comprising such a system
CN104459456A (en) * 2013-09-18 2015-03-25 国家电网公司 Overhead line fault indication device
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CN103217631A (en) * 2013-04-16 2013-07-24 航天科工深圳(集团)有限公司 Power supply control cabinet and implementation method thereof
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CN103513161A (en) * 2013-09-27 2014-01-15 孙双春 Power transmission and transformation system fault searching locating instrument and searching method
CN103513161B (en) * 2013-09-27 2017-07-14 中国石油化工股份有限公司 Electrical power trans mission/distribution system trouble shoot position indicator and lookup method
CN104977503A (en) * 2015-06-23 2015-10-14 中山市木易万用仪器仪表有限公司 Circuit breaking detector
CN106300254A (en) * 2016-10-13 2017-01-04 国家电网公司 A kind of relay protecting method identifying the single-phase or biphase broken string of circuit
CN106300254B (en) * 2016-10-13 2019-02-15 国家电网公司 Route is single-phase or the relay protecting method of two-phase broken string for a kind of identification
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CN106569095B (en) * 2016-11-09 2019-07-26 于祥茹 A kind of electric network failure diagnosis system relying on classifier based on weighted average

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