CN106501671A - A kind of monitoring method of electric distribution network overhead wire failure - Google Patents

A kind of monitoring method of electric distribution network overhead wire failure Download PDF

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Publication number
CN106501671A
CN106501671A CN201610891239.1A CN201610891239A CN106501671A CN 106501671 A CN106501671 A CN 106501671A CN 201610891239 A CN201610891239 A CN 201610891239A CN 106501671 A CN106501671 A CN 106501671A
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China
Prior art keywords
fault
fault detector
line
phase
failure
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CN201610891239.1A
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Inventor
周鸣
柴俊
姚明
韩浩江
吴昊
陈超
凌万水
温彦军
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State Grid Shanghai Electric Power Co Ltd
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State Grid Shanghai Electric Power Co Ltd
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Priority to CN201610891239.1A priority Critical patent/CN106501671A/en
Publication of CN106501671A publication Critical patent/CN106501671A/en
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/08Locating faults in cables, transmission lines, or networks
    • G01R31/081Locating faults in cables, transmission lines, or networks according to type of conductors
    • G01R31/086Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors

Abstract

A kind of monitoring method of electric distribution network overhead wire failure, belongs to detection field.Which is correspondingly arranged a fault detector on the three-phase line of electric distribution network overhead wire on the way several shaft towers respectively, arranges a monitoring communication terminal on the shaft tower of fault detector place;Fault detector and short-distance wireless communication network is provided with between the monitoring communication terminal on tower bar;Monitoring communication terminal carries out remote-wireless network connection through GPRS wireless networks with system main website.Which passes through each section of line fault failure of the current data of fault detector synchronous acquisition, and reappear the three-phase current waveform of fault moment, residual voltage and electric current are calculated by relay protection algorithm, according to preset judgment conditional judgment line fault species, the accuracy of earth fault judgement is substantially increased, contributes to the raising of the practical operation level of live power distribution automation.It is particularly suitable for the distribution network automated transformation supplementary item of the distribution network automated construction mode in small and medium-sized cities or large size city.

Description

A kind of monitoring method of electric distribution network overhead wire failure
Technical field
A kind of the invention belongs to detection field, more particularly to monitoring method for distribution line failure.
Background technology
In power system, power supply is from power plant, and is sent to load side by high pressure or EHV transmission network, then The user for electric energy being assigned to different electric pressures by electric pressure relatively low network, this acting primarily as in power network distribute electricity The network that can be acted on is known as distribution network, abbreviation power distribution network.
Power distribution network is in core status as in intelligent grid, and in recent years, Utilities Electric Co. greatly develops power distribution network industry, causes Power in set up efficiently, stable, reliable power distribution network.
Now, the development of power distribution network encounters line fault detection and the difficult problem of failture evacuation, especially in remote mountain areas and Extremely complex regional especially prominent of landform.
Fault detector positions effective supplementary meanss as distribution network failure, is increasingly approved by electric power network company, And installed in distribution network line in a large number in the future.
The fault type mostly occurred in power distribution network mainly has short trouble and earth fault;Short trouble have three-phase with biphase Short circuit point;Earth fault type species is various, typically mainly singlephase earth fault, which is judged and is positioned always A global difficult problem;When there is earth fault in three-phase line, although the electric current, voltage and its Vector modulation in three-phase line is still Symmetrically, the normal work of whole power distribution network is not affected, but low current grounding can produces overvoltage phenomenon, easily caused tight , when power distribution network is chronically at low current grounding running status, can there is great potential safety hazard in the electric power accident of weight.
Short trouble can carry out board turning by simple fault detector and indicate fault point, and earth fault can be with Amplitude according to capacitance current carries out threshold values differentiation, determines failure, but all the time, the electric capacity of overhead transmission line earth fault is big Little affected by other factors, typically grounded electric current is less, it is difficult to determine positioning both ground failure by the situation of decision threshold.
Content of the invention
The technical problem to be solved is to provide a kind of monitoring method of electric distribution network overhead wire failure, and which passes through Each section of line fault failure of the current data of fault detector synchronous acquisition, and reappear the three-phase current waveform of fault moment, can Residual voltage and electric current, auxiliary judgment earth fault is calculated by protection algorism, greatly improve the accurate of earth fault judgement Property.
The technical scheme is that:A kind of monitoring method of electric distribution network overhead wire failure is provided, including by failure Each section of line fault failure of the current data of indicator synchronous acquisition, and reappear the three-phase current waveform of fault moment, calculate zero Sequence voltage and electric current, auxiliary judgment earth fault, to improve the accuracy of earth fault judgement, is characterized in that:
In normal operation, the line fault of the corresponding phase line of fault detector detection has when detecting in three-phase line When one phase line breaks down, there is significant change in faulted phase current, and fault detector wakes up CPU therein immediately, and record is worked as Front moment failure markers and corresponding real-time sampling data;Now, the fault detector of failure phase line triggers other two phase line The fault detector on road, records the real-time sampling data of failure markers and corresponding phase line, starts data " record ripple ", and will be with event Target three-phase fault indicator sampled data active reporting monitoring communication terminal during barrier;During communication monitoring terminal-pair line fault phase After the markers of mark benchmark and in addition biphase non-faulting phase line calculates deviation, calling markers deviation is mutually located indicating fault again The cycle sampled data of device is transmitted to communication monitoring terminal;The fault data that samples is passed through telecommunication system by communication check terminal System is transmitted to system main website, and main station system reappears the three-phase current waveform of fault moment by data fusion, and calculates zero sequence Voltage and zero-sequence current, it is earth fault or short trouble to distinguish trouble point circuit according to predetermined Rule of judgment, according to The difference of failure mode, takes corresponding measure to be effectively isolated line fault, improves the accuracy that earth fault judges.
Further, the electric current of described fault detector real-time monitoring circuit and to earth electric field, detect short circuit on the spot therefore Barrier, and the triggering record ripple in circuit curtage ANOMALOUS VARIATIONS, by the communication check terminal on shaft tower, by short circuit Failure remote signals and record waveform are uploaded to system main website in the form of remote signals, and system Master Station Software is according to remote signals Short trouble positioning is carried out, and Earth Fault Detection positioning is carried out to electric distribution network overhead wire according to record waveform, instruct O&M Service work, improves the reliability of electrical network.
Specifically, according to following predetermined Rule of judgment, described fault detector judges whether overhead transmission line occurs Short trouble:
For certain fault detector:
1) circuit before fault detector has electricity;
2) fault detector occurs being mutated electricity It >=200A in the line, and It is Sudden Changing Rate current start;
3) high current persistent period 0.02s≤△ T≤3s in the circuit of fault detector place phase, △ T are current break Time;
4) fault detector line outage below;
When above four conditions meet simultaneously, after described fault detector detection judges the fault detector position There is short trouble in the circuit in face.
Specifically, according to following predetermined Rule of judgment, described fault detector judges whether overhead transmission line there occurs Earth fault:
For certain fault detector:
1) there is the transient state capacitance current of unexpected increase in the circuit of fault detector place phase:The transient state of detection ground connection moment Capacitance current is more than certain numerical value;
2) the ground path voltage of fault detector place phase reduces more than 3kV;
3) circuit of fault detector place phase does not have a power failure.
When three above condition meets simultaneously, then described fault detector judges the line of the fault detector position Occurs earth fault behind road.
Compared with the prior art, it is an advantage of the invention that:
1. the data of three-phase current can be accurately calculated, and reappears the current waveform of fault moment;
2., compared with traditional fault detector, synchronous record wave energy, and its reproduction fault moment current waveform are added, can More accurately to judge earth fault;
3. the triggering device of sync identification is had, more accurate sync identification, the calculating of residual voltage and electric current is more Accurately.
Description of the drawings
Fig. 1 is the system structure diagram of the present invention;
Fig. 2 is the schematic flow sheet of simultaneous techniquess failure wave-recording of the present invention;
Fig. 3 is short circuit current flow failure criterion schematic diagram;
Fig. 4 is Earth Fault Detection criterion schematic diagram;
Fig. 5 is short trouble schematic diagram;
Fig. 6 is short trouble record ripple result schematic diagram;
Fig. 7 is circuit method of operation topological view;
Fig. 8 is that the circuit method of operation is intended to.
In figure, 1 is fault detector, and 2 are monitoring communication terminal, and 3 is electric distribution network overhead wire, and 4 is GPRS wireless networks, 5 For system main website, 6 is trouble point.
Specific embodiment
The present invention will be further described below in conjunction with the accompanying drawings.
Traditional breakdown repair is mainly reported for repairment by dispatching down distributing or user and learns the faulty generation of circuit, is then spent big Amount human and material resources carry out hauling type inspection to circuit or investigation finds trouble point step by step, then will restore electricity after troubleshooting, this The Distribution Network Failure processing mode causing trouble repairing for planting blindness formula is more passive, and require a great deal of time the localization of faults, Waste time and energy;The especially singlephase earth fault of distribution network systems, singlephase earth fault search that difficulty is big, and fault detection method is accurate Rate is not high, and becoming affects the principal element of fault outage.
In Fig. 1, the technical program provides a kind of monitoring method of electric distribution network overhead wire failure, described monitoring system Including the fault detector on each monitoring point of electric distribution network overhead wire and the system main website for being arranged on Surveillance center, its Inventive point is:
On A, B, C three-phase overhead transmission line 3 of electric distribution network overhead wire on the way several shaft towers, one is correspondingly arranged respectively Fault detector 1, three described fault detectors carry out malfunction monitoring and indicating fault to A, B, C three-phase line respectively;
On the shaft tower that fault detector is located, a monitoring communication terminal 2 is set;
Three described fault detectors are correspondingly arranged with the monitoring communication terminal on same tower bar, constitute one group of power distribution network event Barrier field monitoring unit;
Between three described fault detectors, and fault detector and between the monitoring communication terminal on tower bar, It is provided with short-distance wireless communication network;
Described monitoring communication terminal carries out remote-wireless network connection through GPRS wireless networks 4 with system main website 5;
Multigroup described distribution is provided with per bar from transformer and distribution station to the electric distribution network overhead wire between power consumer Net fault in-situ monitoring means;
Described communication monitoring terminal is carried out same with fault detector using ultrasound wave or infrared assist in synchronization time service device Step time service;When communication monitoring terminal sends time service order, the fault detector on three-phase line receives trigger simultaneously, And when starting synchronous pair;In running, when periodically synchronizing pair, in the case of keeping fault detector longtime running Three-phase fault indicator in clock keep synchronization accuracy;
In Fig. 2, in normal operation, the CPU of fault detector in a dormant state, the AD of fault detector under this state Module carries out high-speed sampling, transmits real-time sampled data by dma module to the built-in storage of fault detector, memory storage The buffer area of device preserves newest data by way of circulation is rotated always, and CPU is called out in T intervals by Interruption Wake up, CPU is waken up the sampled data stored in a large number by post processing, obtains the telemetry value of three-phase line service data;
In normal operation, the line fault of the corresponding phase line of fault detector detection has when detecting in three-phase line When one phase line breaks down, there is significant change in faulted phase current, and fault detector wakes up CPU therein immediately, and record is worked as Front moment failure markers and corresponding real-time sampling data;Now, the fault detector of failure phase line triggers other two phase line The fault detector on road, records the real-time sampling data of failure markers and corresponding phase line, starts data " record ripple ", and will be with event Target three-phase fault indicator sampled data active reporting monitoring communication terminal during barrier;During communication monitoring terminal-pair line fault phase After the markers of mark benchmark and in addition biphase non-faulting phase line calculates deviation, calling markers deviation is mutually located indicating fault again The cycle sampled data of device is transmitted to communication monitoring terminal;The fault data that samples is passed through telecommunication system by communication check terminal System is transmitted to system main website, and system main website reappears the three-phase current waveform of fault moment by data fusion, and calculates zero sequence Voltage and zero-sequence current, it is earth fault or short trouble to distinguish trouble point circuit, and according to the difference of failure mode, it is right to take The measure that answers is effectively isolated line fault, improves the accuracy that earth fault judges.
When there is uniline failure, triggering the fault detector on failure phase line carries out failure wave-recording, collection event Barrier markers and real-time sampling data, the synchronous fault detector record failure markers for triggering other two phase lines and real-time sampling number According to.Recorder data passes through to be wirelessly transferred according to the communication format of regulation, after monitoring communication terminal receiving data frames, has been adopted before this Target extracting data fault moment non-faulting current sampling data during belt transect, reproduction fault moment current waveform, more smart in time Standard judges line fault.In synchronous triggering record wave process, it is necessary to assure fault detector is in wireless receiving state.Using rule Fixed acknowledgement mechanism, it is ensured that fault detector is linked normally with monitoring communication terminal.
The technical program monitor circuit operating mode when, using short-distance wireless and long distance wireless mixed networking technology, with each Network topology is planted, actively regularly reporting fault state, communications two-way confirmation and re-transmission is had ensured that in data transmission procedure Reliability.The failed transmission time of fault detector can pass through artificial setting, grasp circuit running status in real time for greater flexibility, Wireless communications traffic rate can effectively be reduced simultaneously, it is ensured that cost control.
Monitoring communication terminal is the bridge that fault detector is interacted with system main website, by short-distance wireless and long distance wireless Mixed networking technology so that monitoring communication terminal has path monitoring, switching and a fault alarm ability, support system diagnostics, from More and communication disruption recover after data forward function.Monitoring communication terminal possesses wireless communication ability, can pass through remotely control To change device parameter, setting valve.By the high-reliability electrical origin system using solar energy and the active and standby power supply of maintenance-free battery, protect Card system stability reliability, main website staff can be to circuit work information and fault message real-time monitoring.
Specifically, monitoring communication terminal receives the circuit event that fault detector sends using short-distance radio network technology Barrier information, load current data, support star topology network structure;By the electric current VPN private networks based on 2.5G/3G wireless networks Set up with system main website and communicate, line operational data information is uploaded to main website, realize fault message and fortune to distribution network The monitoring of row operating mode.Unit supports the stipulations such as IEC101, IEC104, expansible.The industrial design of communication module is using international main Stream manufacturer technical grade wireless communication chips, possess channel monitoring, passage switching and fault alarm function, support system diagnostics and from More;Data forward after supporting communication disruption to recover, prevents loss of data.
The Master Station Software platform being located in master station, relies on big data total system, will high accuracy, high sampling rate Current recording data and load current detection data, carry out software processes and analysis, obtain turn supply, line topological adjustment humorous Ripple current monitoring curve, and then the process that failure occurs, develops is analyzed, fault source tracing feedback is carried out, short circuit, ground connection event is accurately identified Barrier, is accurately positioned fault section.The fault message that handles well and positioning failure section are passed through GPRS communication modes by master station, On issue line walking staff, instruct failure line walking, O&M service work, to improve power supply reliability.
By distribution line waveform synthesis monitoring method and analytical technology based on big data, the technical program can be to bag Include the line status such as line fault, line loss, the quality of power supply to be analyzed, be to optimize power distribution network result to improve reliable data comprehensively Support.
Which adopts data acquisition and the integration function of analog quantity and digital quantity mode, integrated on-line monitoring application software to realize Remote measurement, remote signalling, remote control and faulty line defencive function.
Research is found, is sampled by DMA and can greatly increase system power dissipation.
The technical program combines the low power consumption characteristic of CPU, by time-multiplexed method, in systematic sampling and CPU power consumption Between obtain balance.
Fault detector detects line fault, can prevent malfunction, tripping.After identification circuit fault condition, accurately detect Phase fault, single-phase earthing etc., by signal processing and computing, automatically determine fault current actuation of an alarm value;Effectively prevent from bearing Malfunction, tripping caused by lotus fluctuation, combined floodgate excitation surge current etc.;There is inverse time characteristic, coordinate transformer station to greatest extent Protection feature, avoids ringing, it is ensured that action is correct.
When breaking down, using super bright LED inside fault detector, by the state of its 360 ° of Full visions Indicate, the operating mode for showing current line, reasonable failure judgement situation is combined by multiple flicker frequencies, and feeds back to staff Do respective handling.Line fault eliminate restore electricity after, can multiple reset modes to failure automatic resetting, set.
Fault detector carries out data processing and calculating by integrated monitoring software to the data that collection comes, and realizes remotely Telemetry function, its functional characteristic are as follows:
A) remote measurement amount is directly gathered:The analog quantity such as including Ua, Ub, Uc, Ia, Ib, Ic.
B) following remote measurement amount is calculated:
(1) triple line electric field intensity, load current, Sudden Changing Rate electric current, temperature, backup battery voltage, power taking voltage;Zero sequence Electric current, residual voltage;
(2) frequency;
(3) signal strength;
(4) function can be set to remote measurement dead zone range;
(5) there is history data store function, memory gap is minimum 30 seconds, and memory capacity is more than 30 days.
Fault detector by long distance wireless maintenance operation parameter, updates failure criterion under circuit autonomous operation operating mode Or upgrading software program.So convenient, flexible, maintainable strong.
Monitoring communication terminal in the technical program relies primarily on 20W solar panels, super capacitor with non-maintaining lead Acid accumulator composition highly redundant, high-reliability power system, which is communicated with main website and relies primarily on electric power 101,104 stipulations.Support Distributed feeder automation, while support switch remote signalling, remote measurement, remote signal amount and the controllable remote signalling power supplies of DC24V/remote control electricity Source, Switching Power Supply operate.Under monitoring communication terminal in working order, it is recommended to use alternating current power supply is powered.
Monitoring communication terminal is using low power consumption CPU and technical grade radiocommunication module, it is achieved that monitoring communication terminal with Communication and information between fault detector, monitoring communication terminal and system main website is exchanged, and extremely low power dissipation real time bidirectional Communication function.
The built-in GPS time service modules that matches of monitoring communication terminal, install high-gain active antenna, and time service precision is reachable 1us, carries out wireless time service by using short-distance wireless, and self-checking device clock can make line monitor acquisition ± 100us The precision absolute time mark of precision.When not receiving pair during order, possesses punctual function.When supporting GPS pair, self adaptation second arteries and veins Punching/sectors punching/B forms.
Monitoring communication terminal can be can achieve according to the three-phase current of AC sampling, the mutual resultant current of electric field, electric field signal Precisely detection, positioning failure waveform are uploaded to main station system to earth fault on the spot, for line fault analysis, inverting and trace to the source; The simple computation such as the merging of remote signals can be carried out.
Monitoring communication terminal samples solar panel as main power source, while adopting the chargeable electric power storage of non-maintaining long-life Pond is used as stand-by power supply.Have solar powered in the case of, preferentially powered using solar power supply board;Without solar energy In the case of, to be powered using stand-by power supply, stand-by power supply can be supported to monitor communication terminal continuously work 15 days in a communication state (continuous dayses are relevant with the reserve battery capacity for selecting), is not required to supplement energy.Built-in high-performance processor is according to the sun Energy power panel and the monitor in real time result of colloid storage battery, switch between main power source and stand-by power supply.
Conveniently by a distant place, the equipment of monitoring communication terminal can safeguard that main website enters line program upgrading, support that multiple monitorings are logical Letter terminal batch, automatic maintenance one by one and upgrading, simple and safe operation.Meanwhile, support short message managing function.Every Autonomous Model Local Autonomous Model feed line automatization terminal system model is only capable of comprising partial model, i.e., internal have and be only capable of comprising access distribution end Hold corresponding switching information and adjacent switching information.When adding, deleting or add distribution primary network, it is only necessary to which modification is corresponding The controller parameter of website and the parameter of electric neighbor controller, other controller parameters should not be changed.
Monitoring communication terminal can be automatically obtained fault location, On-line Fault prison under conditions of participating in without system main website Survey, for different protection for feed line and primary equipment, possess corresponding auto-action mechanism.
When circuit is short-circuited, it is grounded, has a power failure and when the running status such as power transmission changes, fault detector detects change Signal, and judge whether circuit there occurs failure, before trouble point to all indicators on substation fault loop all can action, And scene provides instruction.
Monitoring communication terminal supports complicated network line topology using short-distance wireless and long distance wireless mixed networking technology Structure;Circuit work condition state (above call time and voluntarily can arrange) is regularly reported at set intervals actively, with communications Two-way confirmation and functions of retransmission, it is ensured that the reliability in data transmission procedure.Control circuit real-time running state at any time, prevent one Its awake, phenomenon for a " deep sound sleep ", while GPRS flow rate can be reduced.Circuit is shown by the combination of multiple flicker frequencies simultaneously Current operating mode, eliminates and can automatically reset after replying power supply;Malfunction can manually or wireless networking automatically resets, puts Position.
The information such as the short circuit that fault detector will be monitored, ground connection, power failure, power transmission, electric current and temperature pass through short-range radio frequency Signal transmission will send information to working main station to monitoring communication terminal, then via monitoring communication terminal by GSM/GPRS, main Stand and show determination guilty culprit section by the change flicker of circuit color is directly perceived, while pop-up dialogue box prompting is reported to the police, and with The form of short message sends trouble point information to inspector's mobile phone.
In Fig. 3, when distribution line occurs phase fault, very big electricity on the loop between transformer station and trouble point, can be flow through Stream, protective relaying device starting protection, line tripping.Comprehensive case above, short trouble criterion have following 4 conditions:
For certain fault detector:
1) circuit before fault detector has electricity;
2) fault detector occurs being mutated electricity It >=200A in the line, and It is Sudden Changing Rate current start;
3) high current persistent period 0.02s≤△ T≤3s in the circuit of fault detector place phase, △ T are current break Time;
4) fault detector line outage below;
When above four conditions meet simultaneously, described distribution network failure monitoring method detection judges the fault detector institute There is short trouble in the circuit for postponing face in place.
The concept of " above " and " below " of fault detector here, is between certain fault detector by transformer station Circuit be discussed as being the fault detector " above ", certain fault detector is stated as to the circuit between electric terminal It is the fault detector " below ", is habitual saying in the industry.
Using quick-break excessively stream two-part current protection principle, while detecting circuit running status, can effectively suppress to close a floodgate, weigh Inrush phenomenon and feedback power transmission misoperation, can on-line tuning parameter, detect sensitiveer reliability.Such as quick-break, excessively stream definite value are joined Number is both configured to 700A, and quick-break, overcurrent delay parameter constant are converted to the excessively stream mutation criteria of self adaptation load current.
In Fig. 4, when circuit occurs single-phase earthing, according to different grounding requirement (such as metallic earthing, high resistance ground Deng), it may appear that the transition effect of Various Complex, including the distribution capacity discharge current for line-to-ground occur, ground path is over the ground Voltage declines.Comprehensive case above, ground connection criterion are as follows:
For certain fault detector:
1) there is the transient state capacitance current of unexpected increase in the circuit of fault detector place phase:The transient state of detection ground connection moment Capacitance current is more than certain numerical value;
2) the ground path voltage of fault detector place phase reduces more than 3kV;
3) circuit of fault detector place phase does not have a power failure.
When three above condition meets simultaneously, then described distribution network failure monitoring method detection judges the fault detector There is earth fault behind the circuit of position.
There is after earth fault board turning luminescence display on the spot in circuit, and fault message is sent to system main website.
By the zero-sequence current on whole distribution network line before and after acquisition fault moment everywhere, networking analysis is carried out, can To detect positioning single-phase grounded malfunction in grounded system of low current.
Certain proportion is flown up or is declined and exceed to earth electric field when single-phase, and phase current occurs the change of special pattern Change, record ripple will be triggered.
In the technical program, electric distribution network overhead wire intelligent trouble indicator detects that short trouble, line walking are positioned on the spot, Distribution automation main website is positioned according to short trouble remote signalling.Short trouble is positioned as shown in Figure 5.
Record ripple result as shown in Figure 6 in short trouble scene.
In earth fault processing procedure, there is the short trouble record ripple result of earth fault line as shown in Figure 7, it is seen that There is a high frequency transient mistake in the zero-sequence current that phase line (referred to as failure phase) of earth fault occurs in overhead transmission line Journey, fault detector capture this high frequency transient zero sequence current signal, coordinate zero sequence electric field signal, you can realization detects little on the spot The function of current earthing failure.
In the technical program, no matter small current neutral grounding power distribution network uses earth-free mode, or through arc suppression coil Earthing mode, all can occur instantaneously to produce the transient process that a persistent period is at 5~20 milliseconds, transient process phase in failure Between, zero-sequence current i0On can produce the larger high frequency transient signal of amplitude.
Main website according to positioning short trouble same method, according to low current grounding remote signals, you can the little electricity of positioning The scene of stream earth fault.
According to Fig. 8, the transient zero-sequence current waveform of faulty line and non-fault line is dissimilar;
Transient zero-sequence current waveform similarity on faulty line on fault current path;
Transient zero-sequence current waveform on faulty line on fault current path and on non-faulting current path is dissimilar.
Accordingly, the technical program can achieve networking detection positioning function.
In other words, when a certain bar circuit is short-circuited, it is grounded, has a power failure and when the running status such as power transmission changes, in the line Each fault detector on road detects the signal of change, and judges whether circuit there occurs failure, arrives power transformation before trouble point The all indicators on circuit on the way on station failure loop all can action, and scene provides instruction.
The technical program includes power supply signal collection, fault detect, failure wave-recording, all the time information remote transmitting, synchronous, ultralow work( The functional modules such as consumption control, can achieve failure wave-recording and data remote function.Its online fault recorder data based on device, point The different characteristic of neighboring devices data waveform when analysis failure occurs, effectively judges short circuit and earth fault, and fault point.Adopt Singlephase earth fault location algorithm is used, is made a breakthrough in On-line Fault Detection field, meanwhile, the technical program can be big Big raising power distribution network reliability of operation and efficiency, improve power supply quality, reduce labor intensity and make full use of existing equipment Ability, so that can bring considerable benefit to user and Utilities Electric Co..
The technical program is by each section of line fault failure of the current data of fault detector synchronous acquisition, and reappears failure The three-phase current waveform at moment, can calculate residual voltage and electric current by the protection algorism of relay protection system, sentence according to predetermined The species of disconnected conditional judgment line fault, substantially increases the accuracy of earth fault judgement, can be the big rule of power distribution automation Technical foundation is laid in mould application, the raising to the practical operation level of the power distribution automation at scene, has larger theoretical research It is worth and practical application is worth.It is particularly suitable for the distribution network automated construction mode in small and medium-sized cities or large size city is distribution network automated Transformation supplementary item.

Claims (4)

1. a kind of monitoring method of electric distribution network overhead wire failure, including by each section of line fault of fault detector synchronous acquisition Failure of the current data, and reappear the three-phase current waveform of fault moment, calculate residual voltage and electric current, auxiliary judgment ground connection event Barrier, to improve the accuracy of earth fault judgement, is characterized in that:
In normal operation, the line fault of the corresponding phase line of fault detector detection have in three-phase line a phase when detecting During line failure, there is significant change in faulted phase current, and fault detector wakes up CPU therein immediately, when recording current Carve failure markers and corresponding real-time sampling data;Now, the fault detector of failure phase line triggers other two phase line Fault detector, records the real-time sampling data of failure markers and corresponding phase line, starts data " record ripple ", and will with faulty when Target three-phase fault indicator sampled data active reporting monitors communication terminal;Communication monitoring terminal-pair line fault phase markers base After the accurate markers with addition biphase non-faulting phase line calculates deviation, calling markers deviation is mutually located fault detector again Cycle sampled data is transmitted to communication monitoring terminal;The fault data of sampling is passed by communication check terminal by telecommunication system System main website is transported to, main station system reappears the three-phase current waveform of fault moment by data fusion, and calculates residual voltage With zero-sequence current, it is earth fault or short trouble to distinguish trouble point circuit according to predetermined Rule of judgment, according to failure The difference of species, takes corresponding measure to be effectively isolated line fault, improves the accuracy that earth fault judges.
2., according to the monitoring method of the electric distribution network overhead wire failure described in claim 1, described indicating fault it is characterized in that The electric current of device real-time monitoring circuit and to earth electric field, detects short trouble on the spot, and in circuit curtage ANOMALOUS VARIATIONS Triggering record ripple, by the communication check terminal on shaft tower, short trouble remote signals and record waveform is believed with remote signalling Number form be uploaded to system main website, system Master Station Software carries out short trouble positioning according to remote signals, and according to record ripple ripple Shape carries out Earth Fault Detection positioning to electric distribution network overhead wire, instructs O&M service work, improves the reliability of electrical network.
3., according to the monitoring method of the electric distribution network overhead wire failure described in claim 1, described indicating fault it is characterized in that According to following predetermined Rule of judgment, device judges whether overhead transmission line there occurs short trouble:
For certain fault detector:
1) circuit before fault detector has electricity;
2) fault detector occurs being mutated electricity It >=200A in the line, and It is Sudden Changing Rate current start;
3) high current persistent period 0.02s≤△ T≤3s in the circuit of fault detector place phase, △ T are the current break time;
4) fault detector line outage below;
When simultaneously above four conditions meet, described fault detector detection judges the fault detector position below There is short trouble in circuit.
4., according to the monitoring method of the electric distribution network overhead wire failure described in claim 1, described indicating fault it is characterized in that According to following predetermined Rule of judgment, device judges whether overhead transmission line there occurs earth fault:
For certain fault detector:
1) there is the transient state capacitance current of unexpected increase in the circuit of fault detector place phase:The transient state electric capacity of detection ground connection moment Electric current is more than certain numerical value;
2) the ground path voltage of fault detector place phase reduces more than 3kV;
3) circuit of fault detector place phase does not have a power failure.
When three above condition meets simultaneously, then after described fault detector judges the circuit of the fault detector position There is earth fault in face.
CN201610891239.1A 2016-10-12 2016-10-12 A kind of monitoring method of electric distribution network overhead wire failure Pending CN106501671A (en)

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