CN205880119U - Join in marriage power system fault positioning system based on zero sequence current detection technique - Google Patents

Join in marriage power system fault positioning system based on zero sequence current detection technique Download PDF

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Publication number
CN205880119U
CN205880119U CN201620886490.4U CN201620886490U CN205880119U CN 205880119 U CN205880119 U CN 205880119U CN 201620886490 U CN201620886490 U CN 201620886490U CN 205880119 U CN205880119 U CN 205880119U
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circuit
fault
network
zero
distribution
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倪平波
唐冬来
张捷
汪力
石金平
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SICHUAN ZHONGDIAN VENUS INFORMATION TECHNOLOGY Co Ltd
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SICHUAN ZHONGDIAN VENUS INFORMATION TECHNOLOGY Co Ltd
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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

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  • Locating Faults (AREA)
  • Remote Monitoring And Control Of Power-Distribution Networks (AREA)

Abstract

The utility model discloses a join in marriage power system fault positioning system based on zero sequence current detection technique, be provided with join in marriage electric network line fault indicator and with join in marriage that electric network line fault indicator is connected join in marriage the electric network line fault handling main website, be provided with network transmission system in joining in marriage the electric network line fault handling main website, a data acquisition circuit, a clock synchronous circuit, the device management circuit, analysis circuit and background processing circuit, device management circuit connection analysis circuit, analysis circuit connection background processing circuit, background processing circuit connection network transmission system, network transmission system connects the data acquisition circuit, data acquisition circuit connection analysis circuit, clock synchronization circuit connection network transmission system, network transmission system with join in marriage electric network line fault indicator and be connected, the power system fault that joins in marriage through based on the zero sequence current detection technique fixes a position, when the circuit breaks down, can in time confirm fault section and send the malfunction alerting instruction to report the main website to shorten the fault section search time.

Description

Distribution Fault Location System based on zero-sequence current detection technique
Technical field
This utility model relates to the field such as power system technology, FLT, specifically, is based on zero-sequence current The Distribution Fault Location System of detection technique.
Background technology
Along with the beginning of " 13 ", the fast development of power distribution network scale and Distribution Network Equipment prescription rapid Promoting, the distribution various information possessing using value is wider, type is more, density is bigger, precision is higher.For a long time, Grid company is continued to use the periodic inspection system of poor efficiency always and is overhauled Distribution Network Equipment and the repairing of passive type, and causing should Repair hidden danger equipment missing inspection to repair, have impact on its technical performance and service life, serious in the case of can cause fault or accident, impact Power supply reliability.Power distribution network management there is also circuit running status and grasps fine not, line fault and search that difficulty is big, passive type Service does not meets development trend Three Difficult Issues.Based on these demands, in the urgent need to exploitation distribution network equipment state perception and analysis System, uses and searches the distribution line failure instruction technology of line fault point fast and effectively and power non-faulting sector transfer Technology, it is achieved to distribution line failure location and isolation;Use the big data analysis of Distribution Network Equipment, auxiliary decision technology, it is achieved State of electric distribution network assessment, fault diagnosis, the repair based on condition of component work for Distribution Network Equipment provides technical support, thus promotes electrical network enterprise The economic benefit of industry.
Current Distribution Network Failure localization method mainly has a following two:
First half-wave method: occur in phase voltage based on earth fault that this is it is assumed that now fault phase electricity close to maximum moment Holding electric charge to be discharged to trouble point by fault phase circuit, faulty line distribution capacity and distributed inductance have damped oscillation characteristic, This electric current is without arc suppression coil, so the maximum of transient inductance electric current occurs in phase voltage through zero passage corresponding to earth fault Moment, and fault occurs when phase voltage is close to the moment of maximum, transient inductance electric current is zero.Transient state electric capacity electricity now Flow ratio transient inductance electric current is much bigger, whether isolated neutral system or resonant earthed system, and fault occurs moment Transient process is approximately the same.Utilize faulty line transient zero-sequence current and the amplitude of voltage head half-wave and direction all and normal condition Different features, can realize distribution network failure location.
The shortcoming of first half-wave method is: install and use directional requirement, for ring network power supply, after circuit falls load, former The direction come is the most wrong.Under thunderbolt state, malfunction rate is high, and accuracy rate is only 30%.
Capacitance current pulse amplitude method: occur in phase voltage close to this hypothesis of maximum moment based on singlephase earth fault Detect.
1) in the moment of earth fault, there is the transient current that a frequency very amplitude is the biggest, transient current in earth point The steady-state value of the capacitance current that the Amplitude Ration of component flows through same point is several times greater to tens times;
2) discharged to trouble point by fault phase circuit in ground connection transient fault phase capacitance charge, and faulty line distribution electricity Appearance, distributed inductance and resistance have Decay Rate to high-frequency transient state component;
3) all flow to faulty line due to the transient current of all non-fault lines, return to the earth through trouble point, cause event Barrier circuit transient current amplitude maximum between transformer station to trouble point.
Shortcoming: do not support main station system and front end communication, it is impossible to realize failure path simulation, threshold criterion exists and substantially lacks Falling into, fault alarm accuracy rate only has about 40%, it is impossible to position fault fast and accurately.
Power distribution network is directly related with user, and its reliable power supply ability and power supply quality are the straight of electric power enterprise economic benefit Junctor is existing, and distribution automation substantially increases power supply reliability and power supply quality, shortens the accident treatment time, reduces power failure model Enclose, but distribution terminal (FTU/DTU/TTU) is generally deployed in switch or position resolver at present, the distribution line of distance is lacked Education and correction for juvenile offenders control.Distribution line long transmission distance, lines branch are many, ruuning situation is complicated, and natural environment and climate condition is relatively more severe, outward The natural disasters such as broken, equipment fault and thunder and lightning can frequently result in circuit and short circuit and earth fault occur, when breaking down, and faulty section Section (position) is difficult to determine, brings no small difficulty, especially remote districts to service work, searches the most time-consuming expense Power.
Utility model content
The purpose of this utility model is to provide Distribution Fault Location System based on zero-sequence current detection technique, passes through Distribution network failure based on zero-sequence current detection technique positions, and when line failure, this system can determine fault in time Section, concurrently it is out of order warning instruction (or information) report main website (distribution network line fault process main website), substantially reduces Fault section searches the time, for rapidly removing faults, recovers normal power supply, it is provided that powerful guarantee.
This utility model is achieved through the following technical solutions: distribution network failure based on zero-sequence current detection technique location system System, is provided with at distribution network line fault indicator and the distribution network line fault that is connected with distribution network line fault indicator Reason main website, is provided with network transmission system, data acquisition circuit, clock synchronization electricity in distribution network line fault processes main website Road, equipment control circuit, analysis circuit and background process circuit, equipment control circuit linking parsing circuit, analyze circuit and connect Background process circuit, background process circuit connects network transmission system, and network transmission system connects data acquisition circuit, data acquisition Collector linking parsing circuit, clock synchronization circuit connects network transmission system, network transmission system and distribution network line fault Indicator is connected.
Further for preferably realizing this utility model, use the following structure that arranges especially: at described distribution network line Transmission control system, micropower wireless transmission circuit and monitoring device, monitoring device and micropower it is provided with in fault detector Wireless transmission circuit is connected, and micropower wireless transmission circuit connects transmission control system, and transmission control system connects network Transmission system.
Further for preferably realizing this utility model, use the following structure that arranges especially: control system in described transmission Being provided with indicator clock circuit, consolidation circuit, process circuit, storage circuit and network transmitting unit in system, consolidation circuit divides Not being connected with micropower wireless transmission circuit and process circuit, indicator clock circuit connection processes circuit, processes circuit even Connecing storage circuit, storage circuit connects network transmitting unit, and network transmitting unit connects network transmission system.
Further for preferably realizing this utility model, the following structure that arranges of employing especially: described network transmitting unit And network transmission system all uses GPRS network to transmit.
Further for preferably realizing this utility model, use the following structure that arranges especially: control system in described transmission The power supply being powered for transmission control system it is additionally provided with in system.
Further for preferably realizing this utility model, use the following structure that arranges especially: described power supply uses Solaode.
Further for preferably realizing this utility model, use the following structure that arranges especially: in described monitoring device Being provided with electric mutual inductor, monitoring means, processing unit and transmission unit, electric mutual inductor connects monitoring means, monitoring means Connecting processing unit, processing unit is connected with micropower wireless transmission circuit by transmission unit.
Further for preferably realizing this utility model, use the following structure that arranges especially: in described monitoring device It is additionally provided with intelligent switch, and intelligent switch is connected with processing unit.
Further for preferably realizing this utility model, use the following structure that arranges especially: described monitoring device is 3 Individual, and be connected with the phase line of three-phase circuit respectively.
This utility model compared with prior art, has the following advantages and beneficial effect:
(1) this utility model is positioned by distribution network failure based on zero-sequence current detection technique, works as line failure Time, this system can determine fault section in time, concurrently be out of order warning instruction (or information) report main website (distribution network line Troubleshooting main website), substantially reduce fault section and search the time, for rapidly removing faults, recover normal power supply, it is provided that have Try hard to keep barrier.
(2) this utility model can monitor circuit operational factor, detects all kinds of short circuit, earth fault, in case (joining for backstage Guangdong power system process main website) on send monitoring information and fault-detection data.
(3) this utility model monitoring device divides A, B, C three-phase monitoring device unit, respectively the A in monitoring distribution network line, B, C three-phase line.Distribution network line fault indicator can quick and precisely identify when line failure that fault zone is the most remote Pass fault message, substantially reduce trouble shooting time, provide powerful guarantee for rapidly removing faults, recovery normal power supply. When properly functioning, the operation conditions of power distribution network can be monitored in real time by distribution network line fault indicator, can be power distribution network The optimization of the method for operation provides and supports.
(4) this utility model has the characteristic that earth fault judging nicety rate is high, and installs and uses non-directional requirement, and There is the features such as safety in utilization is high.
(5) distribution network line fault described in the utility model process main website is capable of distribution network line fault indicator Equipment control, strengthens the monitoring of distribution line online data, is finally reached the mesh that fault is isolated in time, found in time, processes in time 's.
Accompanying drawing explanation
Fig. 1 is this utility model structural representation.
Fig. 2 is three-phase phasor exploded view.
Fig. 3 is the equivalent circuit of earth fault zero-sequence current component.
Detailed description of the invention
It should be noted that this utility model inevitably relates to software program etc. when implementing, but existing All kinds of software programs of technology (data collection and analysis, contrast, integration etc.) can meet use of the present utility model, and this practicality is new Software program is not altered and does not the most protect by type, and the hardware configuration simply designed for realizing goal of the invention and function is protected Protect.
Below in conjunction with embodiment, this utility model is described in further detail, but embodiment of the present utility model is not It is limited to this.
Arc suppression coil, the one of distribution power equipment, its effect is when, after electrical network generation singlephase earth fault, trouble point is flowed Crossing capacitance current, arc suppression coil provides inductive current to compensate, and makes current in the fault point be down to below 10A, desirably prevents arc Restrike after light zero passage, reach the purpose of arc extinguishing.
Zero-sequence current judges Earth design method: if arc suppression coil does not puts into operation, A, B, C three-phase monitoring device Still can use as line selection apparatus, and carry out sentencing line by " zero-sequence current fundamental voltage amplitude method ", i.e. zero-sequence current the maximum is ground connection Circuit.Arc suppression coil parallel medium resistance line selection mode: put into paralleled medium resistance, its meritorious electricity produced after singlephase earth fault Stream (about 45A), flows only through earth point, and ground path zero-sequence current can increase, and earth-free circuit zero-sequence current is substantially unaffected. The detection of A, B, C three-phase monitoring device put into before and after the variable quantity of each circuit zero-sequence current and after putting into the active power of each circuit big Little, two kinds of methods judge ground path;I.e. variable quantity and the equal the maximum of active power are ground path.
Zero-sequence current System Working Principle: the supply line in power system is three-phase symmetrical, so ground short circuit is electric Flow component is also symmetrical, power distribution network generation earth fault when, just there is zero-sequence current, according to zero-sequence current in system Phase characteristic, use phase method fault position method based on zero-sequence component to realize fault location.
The each component analysis of earth fault:
In three-phase electrical power system, three groups of symmetrical components be can be analyzed to for any asymmetric three-phase phasor, be respectively Positive-sequence component, negative sequence component, zero-sequence component.If three-phase phasor component is respectively Fa, Fb, Fc, footmark 2,1,0 represents positive sequence respectively Component, negative sequence component, zero-sequence component, it may be assumed that
Fa= Fa1+ Fa2+ Fa0 (1);
Fb= Fb1+ Fb2+ Fb0 (2);
Fc= Fc1+ Fc2+ Fc0 (3);
When electrical network is properly functioning, system only exists positive-sequence component, but when electrical network generation earth fault, in system Then there is positive-sequence component, negative sequence component, zero-sequence component;Wherein, power system and electric power can be set by negative sequence component and zero-sequence component Standby generation harmful effect;When power distribution network generation earth fault, positive-sequence component shows as three-phase symmetrical, equal in magnitude, phase place is suitable Clockwise differs 120 °;Negative sequence component then presents three-phase symmetrical, equal in magnitude, phase place counterclockwise difference 120 °;And zero Order components three-phase symmetrical, just existence time equal in magnitude, phase place is identical and earth fault only occurs;Three-phase phase as shown in Figure 2 Amount exploded view.
The equivalent circuit of earth fault zero-sequence current component is as it is shown on figure 3, power distribution network transmission system is at some node There is singlephase earth fault in (D point), it is assumed that Earth Phase is A phase, then UDa=0;Due to D point three-phase earth impedance, then system Middle three-phase voltage and electric current are asymmetric;For A phase, the residual voltage at D point ground connection is as excitation, and UD0 is earth point zero Sequence network encourages, and ID0 is circuit zero-sequence current, and ZD0 is circuit zero sequence impedance.
The calculating of earth fault zero-sequence current component:
When the D point of A phase occurs earth fault, there is a following relation:
UDa=0;IDb=0;IDc=0
Voltage equation can be obtained according to shown short circuit point zero sequence net equivalent circuit:
UDa=-ZD0*ID0
When transmission line of electricity generation singlephase earth fault, the zero-sequence current phase place before and after earth point is contrary.So when During transmission line of electricity generation singlephase earth fault, as long as gathering the phase place of the zero-sequence current before and after trouble point respectively and being compared Go out the result of opposite in phase, get final product the railroad section of failure judgement point.
Embodiment 1:
Distribution Fault Location System based on zero-sequence current detection technique, is joined by based on zero-sequence current detection technique Electric network fault position, when line failure, this system can determine in time fault section, concurrently be out of order warning instruction (or information) also reports main website (distribution network line fault process main website), substantially reduces fault section and searches the time, for quickly Fix a breakdown, recover normal power supply, it is provided that powerful guarantee, as it is shown in figure 1, use the following structure that arranges especially: be provided with and join Guangdong power system indicator and the distribution network line fault being connected with distribution network line fault indicator process main website, are joining Guangdong power system is provided with network transmission system, data acquisition circuit, clock synchronization circuit, equipment control electricity in processing main website Road, analysis circuit and background process circuit, equipment control circuit linking parsing circuit, analyze circuit and connect background process circuit, Background process circuit connects network transmission system, and network transmission system connects data acquisition circuit, and data acquisition circuit connects and divides Analysis circuit, clock synchronization circuit connects network transmission system, and network transmission system is connected with distribution network line fault indicator.
Distribution network line fault main website, it is possible to realize distribution network line fault pointer device is managed, strengthen distribution wire Road online data monitoring, is finally reached fault and isolates in time, finds in time, processes in time.Including: network transmission system, data Acquisition Circuit, clock synchronization circuit, equipment control circuit, analysis circuit and background process circuit.
Described network transmission system, is used for managing between distribution network line fault main website and distribution network line fault indicator Communication, receive fault data information, send control instruction;
Described data acquisition circuit, gathers the data of distribution network line fault indicator transmission, including: three-phase voltage, three The total active power of phase current, three-phase, the total reactive power of three-phase, three-phase total power factor, the 2 of current/voltage~19 subharmonic etc.;
Described clock synchronization circuit, for managing the clock (transmission control system gathering distribution network line fault indicator And monitoring device), it is ensured that time consistency between each equipment.
Described analysis circuit, one be to send in distribution network line fault indicator recorder data point (electric current and markers, its Middle short circuit display one phase recorder data, ground connection display three-phase recorder data) carry out described point, it is drawn as waveform;Two is when waveform occurs When offseting in various degree, need to judge circuit whether ground connection and short circuit, and the result annunciator that will study and judge, equipment produces abnormal announcement Alert;Three is that all kinds of faults to circuit provide recommendation on improvement.
Described equipment control circuit, the distribution line on-line monitoring equipment (prison in management distribution network line fault indicator Survey device), application based on existing software program, equipment is increased newly, edit, delete, inquire about;Equipment control circuit is managed The assets of reason include that equipment S/N, bar code, logical address, manufacturing firm, installed date, equipment state (treat throwing, operation, event Barrier), SIM number (collecting unit not this), installation addresses, affiliated circuit, affiliated power supply station (with the relation of transformer station), institute Belong to electric company, collect the incidence relation of unit and collecting unit.
All kinds of faults of circuit are provided recommendation on improvement, to distribution netting twine according to analyzing circuit by described background process circuit Line fault indicator remotely operates.
Embodiment 2:
The present embodiment is to optimize further on the basis of above-described embodiment, further new for preferably realizing this practicality Type, as it is shown in figure 1, use the following structure that arranges especially: be provided with transmission control in described distribution network line fault indicator System, micropower wireless transmission circuit and monitoring device, monitoring device is connected with micropower wireless transmission circuit, micropower without Line transmission circuit connects transmission control system, and transmission control system connects network transmission system.
When design uses, owing to distribution network line is large number of, distributed areas are extensive, branched line is many, ruuning situation Complexity, when breaking down, fault zone is accurately positioned difficulty, causes Distribution Network Failure to process the time longer.And distribution network line fault Indicator can quick and precisely identify fault zone teletransmission fault message when line failure, substantially reduces fault and looks into Look for the time, provide powerful guarantee for rapidly removing faults, recovery normal power supply.When properly functioning, pass through distribution network line Fault detector can monitor the operation conditions of power distribution network in real time, can be that the optimization of the power distribution network method of operation provides support.
Described distribution network line fault indicator is used for distribution network line, has the function of instruction when there is ground connection or short circuit. Distribution network line fault indicator divides indicating member (monitoring device) and remote transmission unit (transmission control system), and indicating member is installed On distribution overhead line, can judge and indicate short circuit and earth fault, be that the line fault information of fault detector refers on the spot Show part, the information such as line current, voltage, temperature can be gathered as required, and can be by line fault, collection data by micro-merit Rate wireless mode uploads to transmission control system.Built on stilts teletransmission type monitoring means (remote transmission unit) is arranged on the shaft tower of overhead transmission line On, received by micro power radio communication mode, process distribution line failure that indicating member uploads, gather the information such as data, Process main website by public network GPRS communication mode and distribution network line fault to communicate simultaneously, be distribution network line fault instruction The line fault information remote transmitting part of device.
Described distribution network line fault indicator, is arranged on distribution line, monitors circuit operational factor, detects all kinds of short Road, earth fault, process to distribution network line fault and send monitoring information and fault-detection data in main website.Monitoring device divide A, B, C three-phase monitoring device, respectively A, B, C three-phase line in monitoring distribution network line.Distribution network line fault indicator can be Quick and precisely identify fault zone teletransmission fault message during line failure, substantially reduce trouble shooting time, for soon Speed fixes a breakdown, recover normal power supply provides powerful guarantee.When properly functioning, can by distribution network line fault indicator To monitor the operation conditions of power distribution network in real time, can be that the optimization of the power distribution network method of operation provides support.
Described micropower wireless transmission unit, receives line fault, collection data that monitoring device is uploaded.
Distribution network line fault indicator is made up of monitoring device and transmission control system, and both by micropower without Line transmission circuit communicates, and distribution network line fault indicator is arranged on distribution line in use, monitoring circuit fortune Line parameter, detects all kinds of short circuit, earth fault, and send monitoring information and fault detect number in distribution network line fault main website According to.
Embodiment 3:
The present embodiment is to optimize further on the basis of any of the above-described embodiment, further for preferably realizing this reality With novel, as it is shown in figure 1, use the following structure that arranges especially: be provided with indicator clock electricity in described transmission control system Road, consolidation circuit, process circuit, storage circuit and network transmitting unit, consolidation circuit respectively with micropower wireless transmission circuit Being connected with processing circuit, indicator clock circuit connection processes circuit, processes circuit and connects storage circuit, and storage circuit connects Network transmitting unit, network transmitting unit connects network transmission system.
Described consolidation circuit, for closing the measurement data of 3 phase line uploaded by micropower wireless transmission circuit And process;
Described process circuit, according to clock synchronization information, merges A, B, C three-phase line measurement data and compares, will Fault data information record is at storage circuit, and starts network transmitting unit, is uploaded to join by data by network transmission system Guangdong power system processes main website;In actual applications, process fault discrimination function to include: one is short circuit and earth fault Identifying, self adaptation load current size, the initiation value of fault mutation current is preferably not less than 150A, when monitoring device detects fault Electric current and this fault current quickly disappear, aftercurrent be less than 5A drift value, monitoring device energy in-site collecting fault message, with Flash of light form indicates fault on the spot, and fault message can be uploaded to distribution network line fault processes main website;Two is monitoring circuit Operation information and the status informations such as main power supply, back-up source such as three-phase load electric current, phase electric field intensity, fault current, and energy Process main website by delivering to distribution network line fault in information above, and the data acquisition of main website can be processed by distribution network line fault Collector carries out failure wave-recording;Three be earth fault differentiate adapt to isolated neutral, grounding through arc, through low resistance grounding Etc. neutral grounding in distribution power network, and different distribution network shelf structure;Meet metallic earthing, arc grounding, resistance connect The different Earth Fault Detection requirement such as ground;Four is when, after line failure, distribution network line fault processes main website can correctly be known Other fault type, and reset form can be selected according to fault type;
Described network transmitting unit, for being uploaded to distribution network line event by A, B, C three-phase line fault data after merging Barrier processes main website;Support to give on data timing, load out-of-limit on send, heavy duty sent and actively calls survey together, minimum is sent time interval It it is 15 seconds;
Described storage circuit, storage processes the fault data of circuit record, when actual Application Design, preferably stores each Monitoring device preserves electric current, phase electric field intensity fixed-point data, 64 event of failure records and 64 fault recorder datas of 30 days, And power-off can preserve, fixed-point data is fixed as 1 day 96 point;
Described indicator clock circuit, positions for monitoring device geographical position GPS, and three-phase monitoring means gps clock is same Step.
Embodiment 4:
The present embodiment is to optimize further on the basis of any of the above-described embodiment, further for preferably realizing this reality With novel, as it is shown in figure 1, use the following structure that arranges especially: described network transmitting unit and network transmission system all use GPRS network is transmitted, and when design uses, preferably network transmitting unit and network transmission system is used GPRS network transmission Mode be transmitted communication, also can have 3G or 4G network be transmitted communication;(network transmission is single for described GPRS transmission unit Unit), for A, B, C three-phase line fault data after merging is uploaded to distribution line troubleshooting master by network transmission system Stand;It supports to give on data timing, load out-of-limit on send, heavy duty sent and actively calls survey together, it is 15 seconds that minimum is sent time interval.
Embodiment 5:
The present embodiment is to optimize further on the basis of any of the above-described embodiment, further for preferably realizing this reality With novel, as it is shown in figure 1, use the following structure that arranges especially: be additionally provided with in described transmission control system as transmission control The power supply that system is powered, when being set using, the work needed for power supply will provide for transmission control system is electric Pressure.
Embodiment 6:
The present embodiment is to optimize further on the basis of any of the above-described embodiment, further for preferably realizing this reality With novel, as it is shown in figure 1, use the following structure that arranges especially: described power supply uses solaode, it is preferred that power supply Power supply uses solaode (solar battery cell), and solar battery cell can convert the solar into electric energy and supply Transmission control system.
Embodiment 7:
The present embodiment is to optimize further on the basis of any of the above-described embodiment, further for preferably realizing this reality With novel, as it is shown in figure 1, use the following structure that arranges especially: be provided with electric mutual inductor, monitoring list in described monitoring device Unit, processing unit and transmission unit, electric mutual inductor connects monitoring means, and monitoring means connects processing unit, and processing unit leads to Cross transmission unit to be connected with micropower wireless transmission circuit.
Described electric mutual inductor, comprises two kinds of current transformer and voltage transformer, high voltage can be become low-voltage, Big electric current becomes small area analysis, measures for monitoring means and protection controls;
Described monitoring means, according to electric mutual inductor measurement data, monitoring circuit three-phase load electric current, phase electric field intensity, Operation information and the status informations such as main power supply, back-up source such as fault current, zero-sequence current, residual voltage;
Described processing unit, by monitoring means measurement data, starts definite value, zero-sequence current real component threshold with ground voltage The set parameter such as value compares, and when measurement data exceedes fault threshold, carries out failure wave-recording, start simultaneously data upload and Fault Isolation function;
Described transmission unit, the fault-signal sent according to processing unit, fault recorder data, fault message etc. are utilized Micropower wireless transmission circuit transmits to transmission control system.
Embodiment 8:
The present embodiment is to optimize further on the basis of any of the above-described embodiment, further for preferably realizing this reality With novel, as it is shown in figure 1, use the following structure that arranges especially: be additionally provided with intelligent switch, and intelligence in described monitoring device Switch is connected with processing unit.
Described intelligent switch, the Fault Isolation signal sent according to processing unit, disconnect 10 KV trouble points.
Embodiment 9:
The present embodiment is to optimize further on the basis of any of the above-described embodiment, further for preferably realizing this reality With novel, as it is shown in figure 1, use especially the following structure that arranges: described monitoring device is 3, and respectively with the phase of three-phase circuit Line is connected, and is respectively mounted a monitoring device, the most respectively A phase monitoring device, B when design uses in each phase line Phase monitoring device and C phase monitoring device.
This utility model has the characteristic that earth fault judging nicety rate is high, in phase three-wire three circuit, three-phase current Phasor and equal to zero, i.e. Ia+Ib+Ic=0.If accessing a current transformer in phase three-wire three, at this moment faradic current is Zero, when circuit occurs electric shock or leak current fault, loop there is leakage current flow through, at this moment through the three-phase of current transformer Electric current phasor and not etc. zero, its phasor and be: Ia+Ib+Ic=I (leakage current, i.e. zero-sequence current).Occur single at distribution line During phase earth fault, the zero-sequence current phase place before and after earth point is contrary.When distribution line generation singlephase earth fault, only To gather the phase place of the zero-sequence current before and after trouble point respectively and be compared the result drawing opposite in phase, getting final product failure judgement The railroad section of point.Asymmetric current source makes to flow through the current signal with obvious characteristic on faulty line, hangs on the line Distribution network line fault pointer detection just can provide indicating fault after this distinctive signal, and therefore this detection mode is not by system The method of operation, topological structure, the impact of neutral grounding mode, accuracy is up to more than 90%, far above first half-wave method and electricity Capacitance current pulse amplitude method.
This utility model installs and uses non-directional requirement.Zero-sequence current judges (the distribution network line event of earth fault device Barrier indicator) non-directional to installing and using, for ring network power supply, after circuit falls load, do not affect its judgement to fault, Thunderbolt judges that on zero-sequence current the impact of earth fault device is little.
This utility model has the advantages that safety is high, the signal that asymmetric current source produces do not affect transforming plant main transformer, Properly functioning (being equivalent to a resistive load put into and exit) of ground connection change, arc suppression coil and circuit, asymmetric current source exists When system is properly functioning completely isolated with a circuit;Simultaneously because the signal that asymmetric current source produces is low frequency purely resistive , it is also possible to eliminate resonance, over-voltage suppression, reduce the overvoltage harm to power distribution network location equipment.
The above, be only preferred embodiment of the present utility model, and this utility model not does any pro forma limit System, every according to technical spirit of the present utility model, above example is made any simple modification, equivalent variations, each fall within Within protection domain of the present utility model.

Claims (9)

1. Distribution Fault Location System based on zero-sequence current detection technique, it is characterised in that: it is provided with distribution network line event Barrier indicator and the distribution network line fault being connected with distribution network line fault indicator process main website, in distribution network line event Barrier is provided with network transmission system, data acquisition circuit, clock synchronization circuit, equipment control circuit, analyzes electricity in processing main website Road and background process circuit, equipment control circuit linking parsing circuit, analyze circuit and connect background process circuit, background process electricity Road connects network transmission system, and network transmission system connects data acquisition circuit, data acquisition circuit linking parsing circuit, clock Synchronous circuit connects network transmission system, and network transmission system is connected with distribution network line fault indicator.
Distribution Fault Location System based on zero-sequence current detection technique the most according to claim 1, it is characterised in that: Transmission control system, micropower wireless transmission circuit and monitoring device it is provided with in described distribution network line fault indicator, Monitoring device is connected with micropower wireless transmission circuit, and micropower wireless transmission circuit connects transmission control system, and transmission Control system connects network transmission system.
Distribution Fault Location System based on zero-sequence current detection technique the most according to claim 2, it is characterised in that: Indicator clock circuit, consolidation circuit, process circuit, storage circuit and network transmission it is provided with in described transmission control system Unit, consolidation circuit is connected with micropower wireless transmission circuit and process circuit respectively, and indicator clock circuit connection processes Circuit, processes circuit connection storage circuit, and storage circuit connects network transmitting unit, and network transmitting unit connects network and transmits system System.
Distribution Fault Location System based on zero-sequence current detection technique the most according to claim 3, it is characterised in that: Described network transmitting unit and network transmission system all use GPRS network to transmit.
5. according to the Distribution Fault Location System based on zero-sequence current detection technique described in any one of claim 2-4, its It is characterised by: in described transmission control system, be additionally provided with the power supply being powered for transmission control system.
Distribution Fault Location System based on zero-sequence current detection technique the most according to claim 5, it is characterised in that: Described power supply uses solaode.
7. according to claim 2-4, the Distribution Fault Location System based on zero-sequence current detection technique described in 6 any one, It is characterized in that: in described monitoring device, be provided with electric mutual inductor, monitoring means, processing unit and transmission unit, electronics Transformer connects monitoring means, and monitoring means connects processing unit, and processing unit is wirelessly transferred with micropower by transmission unit Circuit is connected.
Distribution Fault Location System based on zero-sequence current detection technique the most according to claim 7, it is characterised in that: In described monitoring device, it is additionally provided with intelligent switch, and intelligent switch is connected with processing unit.
9. distribution network failure based on the zero-sequence current detection technique location system according to claim 2-4, described in 6,8 any one System, it is characterised in that: described monitoring device is 3, and is connected with the phase line of three-phase circuit respectively.
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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108462254A (en) * 2018-03-29 2018-08-28 江苏久创电气科技有限公司 Power network line monitoring device
CN108710064A (en) * 2018-07-27 2018-10-26 四川瑞霆电力科技有限公司 A kind of zero sequence active component molded line line fault indicator
CN109031024A (en) * 2018-08-17 2018-12-18 国网江苏省电力有限公司盐城供电分公司 A kind of current leakage detection system and its detection method based on power grid
CN111060739A (en) * 2020-02-14 2020-04-24 东方电子股份有限公司 Fault type identification method based on differential current and fault characteristic quantity
CN112731066A (en) * 2020-12-31 2021-04-30 上海宏力达信息技术股份有限公司 Self-adaptive ground fault protection method
CN113793230A (en) * 2021-08-09 2021-12-14 国家计算机网络与信息安全管理中心 Dynamic simulation method for ground wire current of power distribution system of data center
CN114764599A (en) * 2022-04-26 2022-07-19 国网四川省电力公司电力科学研究院 Sensitivity analysis method and system for single-phase earth fault of power distribution network

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108462254A (en) * 2018-03-29 2018-08-28 江苏久创电气科技有限公司 Power network line monitoring device
CN108710064A (en) * 2018-07-27 2018-10-26 四川瑞霆电力科技有限公司 A kind of zero sequence active component molded line line fault indicator
CN109031024A (en) * 2018-08-17 2018-12-18 国网江苏省电力有限公司盐城供电分公司 A kind of current leakage detection system and its detection method based on power grid
CN111060739A (en) * 2020-02-14 2020-04-24 东方电子股份有限公司 Fault type identification method based on differential current and fault characteristic quantity
CN111060739B (en) * 2020-02-14 2021-10-12 东方电子股份有限公司 Fault type identification method based on differential current and fault characteristic quantity
CN112731066A (en) * 2020-12-31 2021-04-30 上海宏力达信息技术股份有限公司 Self-adaptive ground fault protection method
CN113793230A (en) * 2021-08-09 2021-12-14 国家计算机网络与信息安全管理中心 Dynamic simulation method for ground wire current of power distribution system of data center
CN114764599A (en) * 2022-04-26 2022-07-19 国网四川省电力公司电力科学研究院 Sensitivity analysis method and system for single-phase earth fault of power distribution network

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