CN106556754A - A kind of online acquisition method of distribution line failure waveform - Google Patents
A kind of online acquisition method of distribution line failure waveform Download PDFInfo
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- CN106556754A CN106556754A CN201610891240.4A CN201610891240A CN106556754A CN 106556754 A CN106556754 A CN 106556754A CN 201610891240 A CN201610891240 A CN 201610891240A CN 106556754 A CN106556754 A CN 106556754A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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- Y—GENERAL 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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS 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
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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- General Physics & Mathematics (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
- Locating Faults (AREA)
Abstract
A kind of online acquisition method of distribution line failure waveform, 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, and a monitoring communication terminal is arranged on the shaft tower of fault detector place；Between three fault detectors, and fault detector and between the monitoring communication terminal on tower bar, it is provided with short-distance wireless communication network；Monitoring communication terminal Jing GPRS wireless networks carry out remote-wireless network connection 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, auxiliary judgment earth fault can be calculated by protection algorism, substantially increase the accuracy of earth fault judgement.Technical scheme 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
Technical field
The invention belongs to detection field, more particularly to a kind of 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
Electric energy is assigned to the user of different electric pressures by electric pressure relatively low network, it is this that distribution electricity is acted primarily as in power network
The network that can be acted on is known as distribution network, abbreviation power distribution network.
Used as core status are in intelligent grid, in recent years, Utilities Electric Co. greatly develops power distribution network industry to power distribution network, 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 installing 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 it is 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
Threshold values differentiation is carried out according to the amplitude of capacitance current, failure is determined, 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.
The content of the invention
The technical problem to be solved is to provide a kind of online acquisition method of distribution line failure waveform, and which leads to
Cross 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, auxiliary judgment earth fault can be calculated by protection algorism, greatly improve the standard of earth fault judgement
True property.
The technical scheme is that：A kind of online acquisition method of distribution line failure waveform is provided, including being arranged on
Fault detector on each monitoring point of electric distribution network overhead wire and the system main website for being arranged on Surveillance center, is characterized in that：
On A, B, C three-phase line of electric distribution network overhead wire on the way several shaft towers, a failure is correspondingly arranged respectively
Indicator, 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 is set；
Three described fault detectors are correspondingly arranged with the monitoring communication terminal on same tower bar, are constituted one and are assembled electrical 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 Jing GPRS wireless networks carry out remote-wireless network connection with system main website；
From transformer and distribution station to the electric distribution network overhead wire between power consumer, multigroup described distribution is being provided with per bar
Net fault in-situ monitoring means；
Described communication monitoring terminal is carried out together using ultrasound wave or infrared assist in synchronization time service device with fault detector
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 normal operation, the CPU of fault detector in a dormant state, under this state, enter by the A/D module of fault detector
Real-time sampled data is transmitted to the built-in storage of fault detector by row high-speed sampling by dma module, built-in storage it is slow
Deposit area and preserve newest data by way of circulating rotation always, CPU is waken up by Interruption in T intervals, CPU quilts
The sampled data stored in a large number by post processing is waken up, the telemetry value of three-phase line service data is obtained；
In normal operation, the line fault of fault detector detection correspondence phase line has in three-phase line is detected
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 correspondence 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 other biphase non-faulting phase line calculates deviation, markers deviation is called again to be mutually located indicating fault
The cycle sampled data of device is transmitted to communication monitoring terminal；The fault data sampled 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 the difference of failure mode, takes right
The measure answered is effectively isolated line fault, improves the accuracy that earth fault judges.
Specifically, described relief area can store the three-phase line service data of 10s.
Specifically, described T intervals are less than 10s.
Specifically, described short-distance wireless communication network at least includes Zigbee networkings or Wi-Fi WLANs.
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.
Further, according to following Rule of judgment, described fault detector judges whether overhead transmission line there occurs short-circuit event
Barrier：
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；
More than, four conditions meet simultaneously, after described fault detector detection judges the fault detector position
There is short trouble in the circuit in face.
Further, according to following Rule of judgment, described fault detector judges whether overhead transmission line there occurs ground connection event
Barrier：
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, the synchronous record wave energy of addition, and its reproduction fault moment current waveform, can
More accurately to judge earth fault；
3. the triggering device of sync identification is possessed, 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 that wireless synchronization technical failure of the present invention records ripple；
Fig. 3 is short circuit current 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, then spends big
Hauling type inspection is carried out to circuit for amount human and material resources 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 and Fig. 2, the technical program provides a kind of online acquisition method of distribution line failure waveform, including peace
The fault detector being mounted on each monitoring point of electric distribution network overhead wire and the system main website for being arranged on Surveillance center, its feature
It 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, are constituted one and are assembled electrical 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 Jing GPRS wireless networks 4 carry out remote-wireless network connection with system main website 5；
From transformer and distribution station to the electric distribution network overhead wire between power consumer, multigroup described distribution is being provided with per bar
Net fault in-situ monitoring means；
Described communication monitoring terminal is carried out together using ultrasound wave or infrared assist in synchronization time service device with fault detector
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 circulating rotation 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 fault detector detection correspondence phase line has in three-phase line is detected
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 correspondence 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 other biphase non-faulting phase line calculates deviation, markers deviation is called again to be mutually located indicating fault
The cycle sampled data of device is transmitted to communication monitoring terminal；The fault data sampled 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, according to the difference of failure mode, takes right
The measure answered 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, has been adopted before this after monitoring communication terminal receiving data frames by being wirelessly transferred according to the communication format of regulation
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 uses each when circuit operating mode is monitored using short-distance wireless and long distance wireless mixed networking technology
Plant network topology, actively regularly reporting fault state, communications two-way confirmation and re-transmission, in having ensured that data transmission procedure
Reliability.The failed transmission time of fault detector can grasp circuit running status for greater flexibility in real time by artificial setting,
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 have path monitoring, switching and 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, monitor communication terminal the circuit event that fault detector sends is received 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 into 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.
Master Station Software platform 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 it is 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 handled 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 that optimization power distribution network result improves 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.
Low power consumption characteristic of the technical program with reference to 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.；With 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 are combined by various flicker frequencies, and feeds back to staff
Do respective handling.Line fault eliminate restore electricity after, can various reset modes to failure automatic resetting, set.
Fault detector by integrated monitoring software to gather come data carry out data processing and calculating, realize long-range
Telemetry function, its functional characteristic are as follows：
A) directly gather remote measurement amount：The analog quantity such as including Ua, Ub, Uc, Ia, Ib, Ic.
B) it is calculated following remote measurement amount：
(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) with 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.It is so convenient, flexible, it is 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 supporting switch remote signalling, remote measurement, remote signal amount and the controllable remote signalling power supplies of DC24V/remote control electricity
Source, Switching Power Supply operation.Under monitoring communication terminal in working order, it is recommended to use alternating current power supply is powered.
Monitoring communication terminal adopts low power consumption CPU and technical grade radiocommunication module, realize 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 matched 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 ordering when not receiving pair, possesses punctual function.When supporting GPS pair, self adaptation second arteries and veins
Punching/sectors punching/B forms.
Monitoring communication terminal can be capable of achieving 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 it is solar powered in the case of, preferentially powered using solar power supply board；In no 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
The monitor in real time result of energy power panel and colloid storage battery, switches 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 to have and be only capable of comprising access distribution end
Hold corresponding switching information and adjacent switching information.When addition, deletion or addition distribution primary network, it is only necessary to modification correspondence
The parameter of the controller parameter of website and 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 no system main website is participated in
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 adopts short-distance wireless and long distance wireless mixed networking technology, supports complicated network line topology
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.Circuit real-time running state is controlled at any time, prevents one
Its awake, phenomenon for a " deep sound sleep ", while GPRS flow rate can be reduced.Circuit is shown by the combination of various 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 by GSM/GPRS to monitoring communication terminal, then via monitoring communication terminal, main
Stand guilty culprit section is determined by directly perceived display of change flicker of circuit color, 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；
More than, four conditions meet simultaneously, and 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 short trouble on the spot, and line walking is positioned,
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 Jing arc suppression coils
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 is capable of achieving 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, and power transformation is arrived 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, are capable of achieving 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
It is big to improve power distribution network reliability of operation and efficiency, power supply quality is improved, labor intensity is reduced and is made full use of existing equipment
Ability, so as to 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, auxiliary judgment ground connection by the protection algorism of relay protection system
Failure, greatly improves the accuracy of earth fault judgement, protection circuit fault fast positioning and lookup, the inspection of circuit operating load
Survey；Technical foundation can be laid for the large-scale application of power distribution automation, to the live practical operation level of power distribution automation
Improve, have larger theoretical research value and practical application value.It is particularly suitable for the distribution network automated construction mould in small and medium-sized cities
The distribution network automated transformation supplementary item of formula or large size city.
Claims (7)
1. a kind of online acquisition method of distribution line failure waveform, including on each monitoring point of electric distribution network overhead wire
Fault detector and be arranged on the system main website of Surveillance center, it is characterized in that：
On A, B, C three-phase overhead transmission line of electric distribution network overhead wire on the way several shaft towers, a failure is correspondingly arranged respectively
Indicator, 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 is set；
Three described fault detectors are correspondingly arranged with the monitoring communication terminal on same tower bar, are constituted one and are assembled electric network fault now
Field monitoring means；
Between three described fault detectors, and fault detector and between the monitoring communication terminal on tower bar, arrange
There is short-distance wireless communication network；
Described monitoring communication terminal Jing GPRS wireless networks carry out remote-wireless network connection with system main website；
From transformer and distribution station to the electric distribution network overhead wire between power consumer, multigroup described power distribution network event is being provided with per bar
Barrier field monitoring unit；
Described communication monitoring terminal is synchronized and is awarded using ultrasound wave or infrared assist in synchronization time service device with fault detector
When；When communication monitoring terminal sends time service order, the fault detector on three-phase line receives trigger, and open simultaneously
Begin synchronous pair when；In running, when periodically synchronizing pair, to keep three in the case of fault detector longtime running
Clock in phase fault indicator keeps synchronization accuracy；
In normal operation, in a dormant state, under this state, the A/D module of fault detector carries out height to the CPU of fault detector
Real-time sampled data is transmitted to the built-in storage of fault detector, the buffer area of built-in storage by speed sampling by dma module
Preserve newest data by way of circulating rotation always, CPU is waken up in T intervals by Interruption, and 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 fault detector detection correspondence phase line has a phase in three-phase line is detected
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, record failure markers and correspondence phase line real-time sampling data, start data " record ripple ", and will with it is 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 other biphase non-faulting phase line calculates deviation, markers deviation is called again to be mutually located fault detector
Cycle sampled data is transmitted to communication monitoring terminal；The fault data sampled 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 the difference of failure mode, takes corresponding
Measure is effectively isolated line fault, improves the accuracy that earth fault judges.
2., according to the online acquisition method of the distribution line failure waveform described in claim 1, described relief area it is characterized in that
The three-phase line service data of 10s can be stored.
3., according to the online acquisition method of the distribution line failure waveform described in claim 1, it is characterized in that described T intervals are little
In 10s.
4. according to the online acquisition method of the distribution line failure waveform described in claim 1, it is characterized in that described short distance without
Line communication network at least includes Zigbee networkings or Wi-Fi WLANs.
5., according to the online acquisition method of the distribution line failure waveform described in claim 1, it is characterized in that described failure refers to
Show the electric current of device real-time monitoring circuit and to earth electric field, detect short trouble on the spot, and in circuit curtage ANOMALOUS VARIATIONS
When triggering record ripple, by the communication check terminal on the shaft tower, by short trouble remote signals and record waveform with remote signalling
The form of signal is uploaded to system main website, and system Master Station Software carries out short trouble positioning according to remote signals, and according to record ripple
Waveform carries out Earth Fault Detection positioning to electric distribution network overhead wire, instructs O＆M service work, improves the reliability of electrical network.
6., according to the online acquisition method of the distribution line failure waveform described in claim 1, it is characterized in that described failure refers to
Show according to following 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≤Δ T≤3s in the circuit of fault detector place phase, Δ T are the current break time；
4) fault detector line outage below；
More than, four conditions meet simultaneously, and described fault detector detection judges the fault detector position below
There is short trouble in circuit.
7., according to the online acquisition method of the distribution line failure waveform described in claim 1, it is characterized in that described failure refers to
Show according to following 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.
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| CN113791304A (en) * | 2021-08-23 | 2021-12-14 | 珠海许继芝电网自动化有限公司 | Fault type and fault section identification method |
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