CN104101812A - Single-phase grounding fault detection and positioning method and system for low-current grounding power distribution network - Google Patents
Single-phase grounding fault detection and positioning method and system for low-current grounding power distribution network Download PDFInfo
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Abstract
Power distribution networks of countries such as China and the like mainly adopt a low-current grounding method. Most faults of the low-current grounding power distribution networks are single-phase high-resistance grounding faults and low amplitude of transient capacitive current signals, short duration, and high detection difficulty are generated in a fault process so that an effective fault detection and positioning system is lacked. The invention discloses a fault detection and positioning method and system for a low-current grounding power distribution network. The system includes feeder line monitoring units, a communication terminal and a system master station. A feeder line monitoring unit wirelessly and synchronously triggers the other two phases to transmit data after a suspected grounding fault is detected. The system master station and the communication terminal adopt GPS time service. The communication terminal and the feeder line monitoring units carry out time hack through a time division multiplexing wireless communication network. The system master station collects three-phase feeder line monitoring unit data at a plurality of points through the communication terminal and detects and positions a grounding fault according to calculated zero-sequence voltage and zero-sequence current and issues a fault signal to feeder line monitoring units in front of a fault point on a fault phase so as to carry out fault indication.
Description
Technical field
The present invention relates generally to the fault detect location of feeder automation part in power distribution automation, especially for the method and system of small current neutral grounding distribution feeder phase-to-ground fault detection location.
Background technology
In electric system, power supply is from generating plant, and be sent to load side by high pressure or EHV transmission network, then by the lower network of electric pressure power distribution the user to different electric pressures, this network that mainly plays distribution electric energy effect in power network is just called distribution network, is called for short power distribution network.In electric system, power distribution network is the short slab that affects customer power supply reliability.The investment relative deficiency of power distribution network, automatization level is low, is a very weak link, and there is this problem countries in the world, and in China, this problem is more outstanding.According to the statistics of 2009, deduction short of electricity factor, the power off time of Chinese user more than 95% is all caused by power distribution network at present.
The common fault of power distribution network mainly contains short trouble and earth fault.Short trouble comprises three-phase shortcircuit and line to line fault, and earth fault common type is singlephase earth fault.For very ripe in the detection technique of short trouble, and for the detection of singlephase earth fault, particularly for the singlephase earth fault of small current neutral grounding power distribution network, also lack at present effective method, be acknowledged as global problem.
China and some national power distribution networks mostly are small current neutral grounding power distribution network, and most faults are all singlephase earth faults.Small current neutral grounding power distribution network major advantage is: during singlephase earth fault, do not form short-circuit loop, only produce very little ground current in system, three-phase line voltage is still symmetrical, does not affect the normal work of system.China Power rules regulation, while there is singlephase earth fault, small current neutral grounding power distribution network can continue operation 1～2h by tape jam.Can improve the reliability of power supply like this, be widely used.
But after generation singlephase earth fault, must find as early as possible Single-phase Ground Connection Failure, fix a breakdown.Otherwise the superpotential that earth fault produces, the power system accident such as can cause electric cable explosion, voltage transformer pt to burn, bus burns.If ground path is used as regular link long-time running simultaneously, bring great hidden danger can to local resident, safety of livestock.2010, there is the single-phase high resistance ground long-time running of distribution overhead line in Hechi City, Guangxi, causes the person accident of getting an electric shock and dying.This type of serious accident case happens occasionally, and has greatly threatened power grid security production.
The earthing mode of small current neutral grounding power distribution network is mainly earth-free and through grounding through arc.According to overvoltage protection and the Insulation Coordination > > of DL/T620-1997 < < alternating-current electric device; pure overhead transmission line or pole line are mixed to the 10kV distribution forming with cable; if capacitance current during earth fault is less than 10A; can adopt earth-free mode; but when capacitance current is greater than 10A, just must installing arc suppression coil.
Power distribution network adopts isolated neutral or through grounding through arc mode, when there is singlephase earth fault, on A, B, C three-phase, can not produce large fault current, below divides both of these case to describe in detail:
1 power distribution network adopts isolated neutral mode
When power network neutral point N is earth-free, the phase in A, B, C three-phase, for example A goes up certain some generation ground connection mutually, as shown in Figure 1.In the fault initial period, the voltage of fault phase A phase will fall rapidly, the voltage of healthy phases B phase and C phase will rise rapidly, neutral point voltage also rises rapidly, now distributed capacitance will be by earth point electric discharge over the ground rapidly over the ground for A phase feeder line, B phase and C phase feeder line over the ground distributed capacitance will form an of short duration charge and discharge process (10ms～20ms) by earth point charging over the ground rapidly, produce larger transient state capacitance current.System will enter stable state subsequently, and power supply, by healthy phases distributed capacitance, earth point, produces a lasting stable state capacitance current.In this process, transient state capacitance current is much larger than stable state capacitance current.
The electric current of three-phase line is directly added, and just can obtain the zero-sequence current of circuit.In like manner, the voltage of three-phase line is directly added, and can obtain the residual voltage of circuit.In this process, the zero-sequence current of faulty line as shown in Figure 2.Before earth fault occurs, the zero-sequence current of circuit is very little, be approximately 0, when earth fault occurs, what first occur is capacitor charge and discharge transient state process, produce larger high frequency transient capacitance current, maintain subsequently a main concentration of energy at the stable state capacitance current of power frequency (50Hz or 60Hz).
2 power distribution networks adopt neutral by arc extinction coil grounding mode
Power network neutral point N when grounding through arc, the phase in A, B, C three-phase, for example A goes up mutually certain some ground connection occurs, as shown in Figure 3.With earth-free similar, in the fault initial period, the voltage of fault phase A phase will fall rapidly, the voltage of healthy phases B phase and C phase will rise rapidly, neutral point voltage also rises rapidly, and now distributed capacitance will be by earth point electric discharge over the ground rapidly over the ground for A phase feeder line, and B phase and C phase feeder line over the ground distributed capacitance will be by earth point chargings over the ground rapidly, form an of short duration charge and discharge process (10ms～20ms), produce larger transient state capacitance current.Arc suppression coil L will produce an offset current subsequently, the stable state capacitance current that offset supply produces by healthy phases distributed capacitance, earth point, and system enters stable state subsequently.Adopt neutral point N through grounding through arc mode, the stable state capacitance current on faulty line will become very little, can not produce larger stable status zero-sequence current as shown in Figure 2, but the transient state capacitance current on faulty line is unaffected.
Small current neutral grounding is particularly through the singlephase earth fault of grounding through arc power distribution network, transient fault current duration is very short, stable fault currents is very little, and statistics show, the stake resistance of most singlephase earth faults is greater than 800 Ω, belongs to high resistance ground, as through branch, through meadow, through ground connection such as moist walls, at this moment transient fault electric current is also little, and the duration is very short again, only has 10～20ms.Thereby small current neutral grounding one-phase earthing failure in electric distribution network detects and location, is known as global problem, mainly contain now following several method and apparatus detecting for small current neutral grounding one-phase earthing failure in electric distribution network:
1 carries out small current line selection and device thereof in transformer station
Existing Small Electric Current Earthing And Routing Device, can select in the outlet of substation bus bar, and earth fault has occurred which bar circuit.Take Fig. 1 and Fig. 3 as example, and substation bus bar has 2 outlets, and one is faulty line, and another is faulty line, and Small Electric Current Earthing And Routing Device can be selected faulty line wherein.
Small Electric Current Earthing And Routing Device is by the residual voltage on collection substation bus bar and the zero-sequence current of each branch line, adopt the unexpected rising of residual voltage as earthing wire-selecting trigger condition, recycle stable state information and the transient information of each branch line zero-sequence current, select faulty line.Different according to its use information, can be divided into stable state line selection apparatus and transient state line selection apparatus.
The route selection of stable state line selection apparatus is according to mainly containing:
(1) the zero-sequence current amplitude of faulty line is maximum;
(2) zero-sequence current phase place and the non-fault line of faulty line are anti-phase;
(3) the zero sequence reactive power of faulty line is for negative;
(4) zero sequence active power of faulty line is large;
(5) 5 subharmonic currents of faulty line are large and anti-phase with non-fault line;
(6) negative-sequence current of faulty line is large.
The route selection of transient state line selection apparatus is according to mainly containing:
(1) amplitude of the first half-wave of transient zero-sequence current when phase voltage reaches maximum of faulty line and non-fault line and voltage is all different from phase place;
(2) the zero-sequence current transient information feature that adopts other disposal routes to extract as small echo, and coordinate artificial intelligence to carry out the identification of faulty line and non-fault line as neural network.
The major defect of Small Electric Current Earthing And Routing Device is:
(1) adopt the existing PT of transformer station and CT to affect route selection reliability and accuracy
Bus residual voltage as Small Electric Current Earthing And Routing Device trigger pip must obtain by the PT being connected in parallel on bus, and the ferroresonance of PT can right route selection cause larger interference.
Because special-purpose zero sequence CT volume is large, cost is high, and need the installation that has a power failure, it is not to obtain by special-purpose zero sequence CT conventionally that Small Electric Current Earthing And Routing Device obtains zero-sequence current, but is measured and obtained with CT by the existing three-phase of transformer station or two-phase.Desirable CT, does not have excitation loss electric current, the ampere turns numerically equal of primary winding and secondary coil, and once surveying electric current and secondary, to survey current phase identical and there is no phase deviation., there is exciting current in the CT of practical application, thereby the ampere turns of primary winding and secondary coil unequal, and the phase place of primary current and secondary current is not identical yet.Therefore, actual CT has angular error and the variation error in phase place conventionally, causes three-phase CT uneven, in the zero-sequence current being obtained, has out-of-balance current by three-phase CT stack, and actual zero-sequence current exists error, affects route selection result.Traditional measurement CT in addition, owing to there being magnetic core, the excitation property of magnetic core is nonlinear, the electric current linearity of impact during from little electric current to large electric current; And magnetic core is when electric current is large, there will be magnetic saturation problem, can cause CT saturated, in actual applications, there is CT saturated phenomenon in Medial & Low Voltage Power Network often, now cannot obtain correct zero-sequence current and carry out route selection; There is energy storage link and hysteresis element in magnetic core, this makes CT transient characterisitics bad, bad to following of current break, is difficult to accurately catch faint transient signal.
(2) can not accurately locate the position of earth fault
Small current earthing wire-selecting can only be arranged on power distribution network bus separated time place, can only be for selecting the branched line that occurs earth fault, and can not locate the position that earth fault appears in branch line.
2 signal injection method and devices thereof
Signal injection method adopts Injection Signal source method to coordinate the continuous earth fault that fault detector can the large ground current of detection and location.The party's ratio juris is: after transformer station detects residual voltage and significantly rises and continue for some time, after zero-sequence current is greater than threshold value and continues for some time, can judge earth fault has occurred, need to drop into arc suppression coil, now at the neutral point of main-transformer, inject the fault current signal of certain pattern, fault detector before earth fault all can detect this signal and provide indication, and fault detector after earth fault all cannot detect this signal and can't move, thereby can identify the position that earth fault occurs.
As shown in Figure 4, ground signalling source is accessed controlled resistive load (middle resistance is generally more than 100 ohm) at the neutral point of substation grounding transformer between over the ground.During fault, under microcomputer is controlled, on the neutral point of substation grounding transformer, the resistive load signal source of (no ground transformer can be connected on bus neutral point constantly) drops into automatically in short-term, thereby between transformer station and on-the-spot earth point, produces special little coded signal electric current.By the coding-control of the resistive load switching to ground signalling source, can produce the code current signal being superimposed upon on load current.The earth-fault indicator that transformer station's outlet and circuit take-off point are installed everywhere, detects auto-action indication after this current signal, reaches the object of indication fault.
Injection Signal source method has following shortcoming:
(1) need to, in transformer station's reload signal source, change system operation mode;
(2) signal source and other equipment need extra investment and construction, need to have a power failure in work progress;
(3) for common stake resistance in more than 800 ohm earth fault, cannot produce enough large coded signal electric current and make fault detector action, cannot detect high resistance earthing fault;
(4) cannot detect transient earthing fault.
3 based on networking distribution sense terminals FTU Earth Fault Detection localization method
Based on networking FTU Earth Fault Detection localization method as shown in Figure 5, the method is by installing and the supporting distribution sense terminals FTU of switch near switch on the line, three-phase current while carrying out record trouble, voltage waveform data, and data are sent to distribution automation main website analyze, the switch section at localization of faults place.
Major defect based on networking FTU Earth Fault Detection localization method is:
(1) switch need to be installed, and must there be CT and PT in switch inside, switch and FTU investment are very huge;
(2) measure the CT little current temporary state signal that defies capture, large electric current can be saturated, in the time of three superimposed generation zero sequences, because three-phase imbalance can cause larger error, high resistance ground is difficult to detect;
(3) PT has ferroresonance problem;
(4) switch and FTU are installed and need line outage construction;
(5) can only navigate to the section between switch, cannot accomplish to locate more accurately;
(6) on pole line for FTU provides power supply very difficult, affect it and install and normal work.
At present, small current neutral grounding system, particularly neutral by arc extinction coil grounding system, lack effective earth-fault detecting method and equipment, can not promptly detect earth fault, indication earthing position.A lot of power supply departments are still being used the legal position of the artificial investigation earth faults such as bracing wire method, these method automaticities are very low, performance difficulty, inefficiency, cannot meet the requirement that electric system continues to improve power supply reliability, just become and improving the quality of power supply, improving one of main difficulty of power supply reliability.In order to improve small current neutral grounding distribution network reliability, be necessary to provide a kind of method and apparatus, after small current neutral grounding power distribution network generation singlephase earth fault, no matter be low-impedance earthed system or high resistance ground, transient fault or permanent fault, can effectively detect and indicate.
Summary of the invention
The invention provides the method and system that a kind of small current neutral grounding one-phase earthing failure in electric distribution network detects, locates.
According to one aspect of the present invention, the invention discloses a kind of method that small current neutral grounding one-phase earthing failure in electric distribution network detects, locates, it comprises:
(1) on power distribution network three-phase feeder line, feeder line monitoring means is installed, feeder line monitoring means from feeder line power taking and also power taking power-controlled, battery is as standby power supply;
(2) feeder line monitoring means picks up each phase voltage signal by capacitive battery pressure sensor, by electronic type current sensor, picks up each phase current signal;
(3) each phase feeder line monitoring means is with logical processing to the voltage signal picking up, current signal, extract transient voltage signal, current signal, and amplitude, mean value, differential value, integrated value and the combination thereof of calculating transient voltage signal, current signal, the variation of one or more in above-mentioned value surpasses threshold value, triggers doubtful earth fault and reports to the police;
(4) fault phase feeder line monitoring means triggers after doubtful earth fault warning, by wireless synchronization, triggers, and notifies other two-phase to upload voltage, current waveform data;
(5) adopt time division multiplexing wireless communication time calibration in network and GPS time service combination, realize accurately to time;
(6) by time-multiplexed cordless communication network, converge voltage, the current waveform data of each position three-phase feeder line monitoring means of power distribution network, calculate residual voltage, the zero-sequence current of each position;
(7) extract the steady-state signal of each position zero sequence voltage, zero-sequence current, computation of characteristic values, comprise: amplitude, mean value, differential value, integrated value and combination thereof, each position stable state zero sequence active power, zero sequence reactive power, calculate the similarity of each position stable state residual voltage, zero sequence current signal waveform, the difference on stable state residual voltage, zero-sequence current eigenwert and waveform similarity according to faulty line and non-fault line, carries out the screening of faulty line and non-fault line;
(8) extract the transient signal of each position zero sequence voltage, zero-sequence current, computation of characteristic values, comprise: amplitude, mean value, differential value, integrated value and combination thereof, each position transient state zero sequence active power, zero sequence reactive power, calculate the similarity of each position transient state residual voltage, zero sequence current signal waveform, according to the difference on transient state residual voltage, zero-sequence current eigenwert and waveform similarity before and after earth fault, to each position, each position on the doubtful faulty line particularly filtering out, preferentially judge location earth fault;
(9) orienting earth fault, combining geographic information system (GIS) demonstrates earth fault on map, issues earth fault signal simultaneously and indicates to feeder line monitoring means, is convenient to artificial line walking location earth fault.
According to one aspect of the present invention, the invention discloses the system that a kind of small current neutral grounding one-phase earthing failure in electric distribution network detects, locates, it comprises:
(1) system is comprised of feeder line monitoring means, communication terminal, system main website;
(2) feeder line monitoring means is arranged on power distribution network three-phase feeder line, feeder line monitoring means from feeder line power taking and also power taking power-controlled, battery is as standby power supply, feeder line monitoring means picks up each phase voltage signal by capacitive battery pressure sensor, by electronic type current sensor, picks up each phase current signal;
(3) each phase feeder line monitoring means is with logical processing to the voltage signal picking up, current signal, extract transient voltage signal, current signal, and amplitude, mean value, differential value, integrated value and the combination thereof of calculating transient voltage signal, current signal, the variation of one or more in above-mentioned value surpasses threshold value, triggers doubtful earth fault and reports to the police;
(4) fault phase feeder line monitoring means triggers after doubtful earth fault warning, by wireless synchronization, triggers, and notifies other two-phase to upload voltage, current waveform data;
(5) between feeder line monitoring means, communication terminal and system main website, adopt time-multiplexed communication to form cordless communication network;
(6) communication terminal and system main website adopt GPS time service, and feeder line monitoring means is by time division multiplexing wireless communication network, carry out network to time, realize between feeder line monitoring means, communication terminal and system main website accurately to time;
(7) system main website platform software, by time-multiplexed cordless communication network, converges voltage, the current waveform data of each position three-phase feeder line monitoring means of power distribution network, calculates residual voltage, the zero-sequence current of each position;
(8) system main website platform software, residual voltage from each position of calculating, in zero-sequence current, extract each position zero sequence voltage, the steady-state signal of zero-sequence current, computation of characteristic values, comprise: amplitude, mean value, differential value, integrated value and combination thereof, each position stable state zero sequence active power, zero sequence reactive power, calculate each position stable state residual voltage, the similarity of zero sequence current signal waveform, according to faulty line and non-fault line at stable state residual voltage, difference on zero-sequence current eigenwert and waveform similarity, carry out the screening of faulty line and non-fault line,
(9) system main website platform software, residual voltage from each position of calculating, in zero-sequence current, extract each position zero sequence voltage, the transient signal of zero-sequence current, computation of characteristic values, comprise: amplitude, mean value, differential value, integrated value and combination thereof, each position transient state zero sequence active power, zero sequence reactive power, calculate each position transient state residual voltage, the similarity of zero sequence current signal waveform, according to before and after earth fault at transient state residual voltage, difference on zero-sequence current eigenwert and waveform similarity, to each position, each position on the doubtful faulty line particularly filtering out, preferentially judge, location earth fault,
(10) system main website platform software is after orienting earth fault, can accept manually to carry out secondary checks, determine final earth fault, on GIS map, demonstrate earth fault, simultaneity factor main website platform software is by time division multiplexing wireless communication network, issue earth fault signal and indicate to feeder line monitoring means, be convenient to artificial line walking location earth fault.
Accompanying drawing explanation
Fig. 1 has shown the earth-free one-phase earthing failure in electric distribution network electric current of neutral point N.
Fig. 2 has shown that rear faulty line zero-sequence current occurs singlephase earth fault.
Fig. 3 has shown that neutral point N is through grounding through arc one-phase earthing failure in electric distribution network electric current.
Fig. 4 has shown Injection Signal source method Earth Fault Detection principle.
Fig. 5 has shown based on networking FTU earth-fault detecting method principle.
Fig. 6 A, Fig. 6 B, Fig. 6 C, Fig. 6 D have shown Method And Principle of the present invention.When Fig. 6 A has shown generation singlephase earth fault, fault phase distribution feeder monitoring means monitors short time voltage, electric current acute variation.Fig. 6 B has shown that fault phase distribution feeder monitoring means detects after doubtful earth fault, by wireless synchronization, triggers other phase feeder line monitoring means.Fig. 6 C has shown that three-phase distribution net feeder line monitoring means is by wireless communication transmissions voltage, current waveform data, and the voltage of three-phase feeder line monitoring means, current waveform convergence, to communication terminal, then are uploaded to system main website.Fig. 6 D shown, the platform software of system main website, after making Earth Fault Detection, issues the feeder line monitoring means that earth fault signal goes up before trouble spot mutually to distribution network failure and indicates.
Fig. 7 A, Fig. 7 B, Fig. 7 C have shown wireless synchronization triggering mode of the present invention.Fig. 7 A shows is that A triggers B phase, C phase when identical; What Fig. 7 B showed is that A first triggers B phase mutually, and B triggers C phase mutually again; What Fig. 7 C showed is that A first triggers communication terminal mutually, and communication terminal triggers B phase, C phase again.
Fig. 8 has shown several system topologies that the present invention adopts.
Embodiment
Fig. 6 has shown Method And Principle of the present invention.
Fig. 6 A has shown, when small current neutral grounding distribution feeder is a certain, occur mutually after singlephase earth fault, in earth fault transient state process, the both sides voltage and current of earth point is within a very short time, acute variation be can there is, abnormal transient voltage signal and current signal produced.Feeder line monitoring means disclosed by the invention mainly depends on from feeder line electricity getting device, battery is as backup, described feeder line electricity getting device core is a magnetisable material with closed magnetic circuit, in two, lay respectively in the first half and main body of equipment, by blocking mechanism, realize the tight closure of magnetic circuit, blocking device is by the case spring or the other types elastic mechanism that are positioned at first half split axle, damper and be positioned at the forming by pressing spring or other types elastic mechanism of magnetic element of the first half, electricity getting device band power is controlled, can control from feeder line power taking power, while guaranteeing feeder line stream too little current, just can get the power of enough work, can be unsaturated during feeder line stream super-high-current or can continue power taking.Feeder line monitoring means disclosed by the invention is used capacitive battery pressure sensor, there will not be the ferroresonance problem of PT, can pick up reliably transient voltage signal.Feeder line monitoring means disclosed by the invention is used electronic type current sensor, precision to current measurement is high, the linearity good, to the measurement of little electric current and large electric current, can have very high precision, and large electric current is unsaturated, transient characterisitics are good, can pick up reliably transient current signal.In small current neutral grounding one-phase earthing failure in electric distribution network transient state process, fault phase distribution feeder monitoring means is by capacitive battery pressure sensor and electronic type current sensor, can monitor transient voltage signal, transient current signal is abnormal.
Fig. 6 B shown, distribution network failure phase feeder line monitoring means detects after doubtful earth fault, triggers other phase feeder line monitoring means upload voltage, the current waveform data that monitor by wireless synchronization.
Fig. 6 C has shown, three-phase distribution net feeder line monitoring means is by wireless communication transmissions voltage, current waveform data, by the voltage of three-phase feeder line monitoring means, current waveform convergence to communication terminal, also can be by the voltage of two-phase feeder line monitoring means, current waveform convergence to a three-phase feeder line monitoring means phase wherein, by communication terminal or feeder line monitoring means by voltage, current waveform data upload the platform software to system main website.
Fig. 6 D shown, the platform software of system main website carries out fault detect location, and issues fault-signal and carry out abort situation indication, concrete comprises following process:
(1) after obtaining the three-phase distribution net feeder line monitoring means voltage of a plurality of positions, current waveform data, the residual voltage of a plurality of positions that can calculate, zero-sequence current waveform;
(2) system main website platform software, residual voltage from each position of calculating, in zero-sequence current, extract each position zero sequence voltage, the steady-state signal of zero-sequence current, computation of characteristic values, comprise: amplitude, mean value, differential value, integrated value and combination thereof, each position stable state zero sequence active power, zero sequence reactive power, calculate each position stable state residual voltage, the similarity of zero sequence current signal waveform, according to faulty line and non-fault line at stable state residual voltage, difference on zero-sequence current eigenwert and waveform similarity, carry out the screening of faulty line and non-fault line,
(3) system main website platform software, residual voltage from each position of calculating, in zero-sequence current, extract each position zero sequence voltage, the transient signal of zero-sequence current, computation of characteristic values, comprise: amplitude, mean value, differential value, integrated value and combination thereof, each position transient state zero sequence active power, zero sequence reactive power, calculate each position transient state residual voltage, the similarity of zero sequence current signal waveform, according to before and after earth fault at transient state residual voltage, difference on zero-sequence current eigenwert and waveform similarity, to each position, each position on the doubtful faulty line particularly filtering out, preferentially judge, location earth fault,
(4) system main website platform software is after orienting earth fault, can accept manually to carry out secondary checks, determine final earth fault, on GIS map, demonstrate earth fault, simultaneity factor main website platform software is by time division multiplexing wireless communication network, issue earth fault signal and indicate to feeder line monitoring means, be convenient to artificial line walking location earth fault.
When a certain phase feeder line monitoring means monitors after doubtful earth fault, need to notify rapidly other two-phase to upload voltage, current waveform data, by three-phase voltage, current waveform data, obtain residual voltage and zero sequence current signal, carry out further earth fault judgement.The wireless synchronization flip flop equipment of the feeder line monitoring means that the present invention proposes, can be used any or combination of infrared ray, sound, ultrasound wave, magnetic field, elect magnetic field as trigger pip, is sent to other two-phase.Feeder line monitoring means wireless synchronization flip flop equipment can also receive wireless synchronization trigger pip simultaneously.Wireless synchronization trigger mode has several as follows:
(1) as shown in Figure 7 A, suppose that A phase feeder line monitoring means monitors doubtful earth fault, A phase feeder line monitoring means is just by wireless synchronization flip flop equipment, and wireless synchronization triggers B phase feeder line monitoring means and C phase feeder line monitoring means;
(2) as shown in Figure 7 B, suppose that A phase feeder line monitoring means monitors doubtful earth fault, A phase feeder line monitoring means is just by wireless synchronization flip flop equipment, and wireless synchronization triggers B phase feeder line monitoring means, subsequently B phase feeder line monitoring means again wireless synchronization trigger C phase feeder line monitoring means;
(3) as shown in Fig. 7 C, suppose that A phase feeder line monitoring means monitors doubtful earth fault, A phase feeder line monitoring means is just by wireless synchronization flip flop equipment, and wireless synchronization triggers communication terminal, and communication terminal again wireless synchronization triggers B phase feeder line monitoring means and C phase feeder line monitoring means.
Fig. 8 has shown several system topologies that the present invention adopts.
The system topology that Fig. 8 A shows is: system is comprised of feeder line monitoring means, communication terminal, system main website, each communication terminal connects three-phase feeder line monitoring means, between communication terminal and three-phase feeder line monitoring means, adopt time division multiplexing wireless communication mode, form cordless communication network, between communication terminal and system main website, by GSM/GPRS, CDMA, WIFI, Ethernet, communicate.System main website and communication terminal adopt GPS time service, between communication terminal and feeder line monitoring means by time-multiplexed cordless communication network carry out to time, finally realize intrasystem accurately to time.
The system topology that Fig. 8 B shows is: system is comprised of feeder line monitoring means, communication terminal, system main website, each communication terminal connects many group three-phase feeder line monitoring means, what Fig. 8 B showed is to have connected two groups of three-phase feeder line monitoring means, communication terminal and organize between three-phase feeder line monitoring means more and adopt time division multiplexing wireless communication mode, form cordless communication network, between communication terminal and system main website, by GSM/GPRS, CDMA, WIFI, Ethernet, communicate.System main website and communication terminal adopt GPS time service, between communication terminal and feeder line monitoring means by time-multiplexed cordless communication network carry out to time, finally realize intrasystem accurately to time.
The system topology that Fig. 8 C shows is: system is comprised of feeder line monitoring means, system main website, when one in three-phase feeder line monitoring means is mutually as identical in B also as communication terminal, and adopt time division multiplexing wireless communication mode between other two-phase feeder line monitoring means, form cordless communication network, between this phase feeder line monitoring means and system main website, by GSM/GPRS, CDMA, WIFI, Ethernet, communicate simultaneously.System main website and the feeder line monitoring means employing GPS time service that is used for doing communication terminal, be used for doing between the feeder line monitoring means of communication terminal and other feeder line monitoring means by time-multiplexed cordless communication network carry out to time, finally realize intrasystem accurately to time.
The system topology that Fig. 8 D shows is: system is by feeder line monitoring means, communication terminal, system main website forms, in three-phase feeder line monitoring means one is mutually as B phase, and adopt time division multiplexing wireless communication mode between other two-phase feeder line monitoring means, form cordless communication network, between this phase feeder line monitoring means and communication terminal, use another one radio band simultaneously, adopt time division multiplexing wireless communication mode, form cordless communication network, each communication terminal connects a plurality of feeder line monitoring means, what Fig. 8 D showed is to have connected two feeder line monitoring means, between communication terminal and system main website, pass through GSM/GPRS, CDMA, WIFI, Ethernet communicates.System main website and communication terminal adopt GPS time service, between communication terminal and feeder line monitoring means by time-multiplexed cordless communication network carry out to time, finally realize intrasystem accurately to time.
System main website platform software, in the voltage, the current waveform data that converge each position three-phase feeder line monitoring means of power distribution network, can calculate residual voltage, the zero-sequence current of each position.System main website platform software, residual voltage from each position of calculating, in zero-sequence current, extract each position zero sequence voltage, the steady-state signal of zero-sequence current, computation of characteristic values, comprise: amplitude, mean value, differential value, integrated value and combination thereof, each position stable state zero sequence active power, zero sequence reactive power, calculate each position stable state residual voltage, the similarity of zero sequence current signal waveform, according to faulty line and non-fault line at stable state residual voltage, difference on zero-sequence current eigenwert and waveform similarity, carry out the screening of faulty line and non-fault line.
System main website platform software, residual voltage from each position of calculating, in zero-sequence current, extract each position zero sequence voltage, the transient signal of zero-sequence current, computation of characteristic values, comprise: amplitude, mean value, differential value, integrated value and combination thereof, each position transient state zero sequence active power, zero sequence reactive power, calculate each position transient state residual voltage, the similarity of zero sequence current signal waveform, according to before and after earth fault at transient state residual voltage, difference on zero-sequence current eigenwert and waveform similarity, to each position, each position on the doubtful faulty line particularly filtering out, preferentially judge, location earth fault.
System main website platform software is after orienting earth fault, can accept manually to carry out secondary checks, determine final earth fault, on GIS map, demonstrate earth fault, simultaneity factor main website platform software is by time division multiplexing wireless communication network, issue earth fault signal and indicate to feeder line monitoring means, be convenient to artificial line walking location earth fault.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited to this, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; can expect easily changing or replacing, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion by the described protection domain with claim.
Claims (10)
1. according to one aspect of the present invention, the invention discloses a kind of method that small current neutral grounding one-phase earthing failure in electric distribution network detects, locates, it comprises:
(1) on power distribution network three-phase feeder line, feeder line monitoring means is installed, feeder line monitoring means from feeder line power taking and also power taking power-controlled, battery is as standby power supply;
(2) feeder line monitoring means picks up each phase voltage signal by capacitive battery pressure sensor, by electronic type current sensor, picks up each phase current signal;
(3) each phase feeder line monitoring means is with logical processing to the voltage signal picking up, current signal, extract transient voltage signal, current signal, and amplitude, mean value, differential value, integrated value and the combination thereof of calculating transient voltage signal, current signal, the variation of one or more in above-mentioned value surpasses threshold value, triggers doubtful earth fault and reports to the police;
(4) fault phase feeder line monitoring means triggers after doubtful earth fault warning, by wireless synchronization, triggers, and notifies other two-phase to upload voltage, current waveform data;
(5) adopt time division multiplexing wireless communication time calibration in network and GPS time service combination, realize accurately to time;
(6) by time-multiplexed cordless communication network, converge voltage, the current waveform data of each position three-phase feeder line monitoring means of power distribution network, calculate residual voltage, the zero-sequence current of each position;
(7) extract the steady-state signal of each position zero sequence voltage, zero-sequence current, computation of characteristic values, comprise: amplitude, mean value, differential value, integrated value and combination thereof, each position stable state zero sequence active power, zero sequence reactive power, calculate the similarity of each position stable state residual voltage, zero sequence current signal waveform, the difference on stable state residual voltage, zero-sequence current eigenwert and waveform similarity according to faulty line and non-fault line, carries out the screening of faulty line and non-fault line;
(8) extract the transient signal of each position zero sequence voltage, zero-sequence current, computation of characteristic values, comprise: amplitude, mean value, differential value, integrated value and combination thereof, each position transient state zero sequence active power, zero sequence reactive power, calculate the similarity of each position transient state residual voltage, zero sequence current signal waveform, according to the difference on transient state residual voltage, zero-sequence current eigenwert and waveform similarity before and after earth fault, to each position, each position on the doubtful faulty line particularly filtering out, preferentially judge location earth fault;
(9) orienting earth fault, combining geographic information system (GIS) demonstrates earth fault on map, issues earth fault signal simultaneously and indicates to feeder line monitoring means, is convenient to artificial line walking location earth fault.
2. according to one aspect of the present invention, the invention discloses the system that a kind of small current neutral grounding one-phase earthing failure in electric distribution network detects, locates, it comprises:
(1) system is comprised of feeder line monitoring means, communication terminal, system main website;
(2) feeder line monitoring means is arranged on power distribution network three-phase feeder line, feeder line monitoring means from feeder line power taking and also power taking power-controlled, battery is as standby power supply, feeder line monitoring means picks up each phase voltage signal by capacitive battery pressure sensor, by electronic type current sensor, picks up each phase current signal;
(3) each phase feeder line monitoring means is with logical processing to the voltage signal picking up, current signal, extract transient voltage signal, current signal, and amplitude, mean value, differential value, integrated value and the combination thereof of calculating transient voltage signal, current signal, the variation of one or more in above-mentioned value surpasses threshold value, triggers doubtful earth fault and reports to the police;
(4) fault phase feeder line monitoring means triggers after doubtful earth fault warning, by wireless synchronization, triggers, and notifies other two-phase to upload voltage, current waveform data;
(5) between feeder line monitoring means, communication terminal and system main website, adopt time-multiplexed communication to form cordless communication network;
(6) communication terminal and system main website adopt GPS time service, and feeder line monitoring means is by time division multiplexing wireless communication network, carry out network to time, realize between feeder line monitoring means, communication terminal and system main website accurately to time;
(7) system main website platform software, by time-multiplexed cordless communication network, converges voltage, the current waveform data of each position three-phase feeder line monitoring means of power distribution network, calculates residual voltage, the zero-sequence current of each position;
(8) system main website platform software, residual voltage from each position of calculating, in zero-sequence current, extract each position zero sequence voltage, the steady-state signal of zero-sequence current, computation of characteristic values, comprise: amplitude, mean value, differential value, integrated value and combination thereof, each position stable state zero sequence active power, zero sequence reactive power, calculate each position stable state residual voltage, the similarity of zero sequence current signal waveform, according to faulty line and non-fault line at stable state residual voltage, difference on zero-sequence current eigenwert and waveform similarity, carry out the screening of faulty line and non-fault line,
(9) system main website platform software, residual voltage from each position of calculating, in zero-sequence current, extract each position zero sequence voltage, the transient signal of zero-sequence current, computation of characteristic values, comprise: amplitude, mean value, differential value, integrated value and combination thereof, each position transient state zero sequence active power, zero sequence reactive power, calculate each position transient state residual voltage, the similarity of zero sequence current signal waveform, according to before and after earth fault at transient state residual voltage, difference on zero-sequence current eigenwert and waveform similarity, to each position, each position on the doubtful faulty line particularly filtering out, preferentially judge, location earth fault,
(10) system main website platform software is after orienting earth fault, can accept manually to carry out secondary checks, determine final earth fault, on GIS map, demonstrate earth fault, simultaneity factor main website platform software is by time division multiplexing wireless communication network, issue earth fault signal and indicate to feeder line monitoring means, be convenient to artificial line walking location earth fault.
3. system according to claim 2, it is characterized in that: the feeder line monitoring means power supply described in system mainly depends on from feeder line electricity getting device, battery is as backup, electricity getting device band power is controlled, can control from feeder line power taking power, while guaranteeing feeder line stream too little current, just can get the power of enough work, can be unsaturated when feeder line flows super-high-current or can continue power taking.
4. system according to claim 2, it is characterized in that: the feeder line monitoring means described in system is used capacitive battery pressure sensor pick-up voltage signal, electronic type current sensor picks up current signal, electronic type current sensor can be current transformer, also can be Wound-rotor type Luo-coil, can be also the board-like Luo-coil of printed circuit.Feeder line monitoring means described in system is with logical processing to the voltage picking up, current signal, obtain transient voltage signal, extract the logical amplitude of voltage signal afterwards of band, mean value, differential value, integrated value and combination thereof, the variation of one or more in above-mentioned value surpasses threshold value, triggers doubtful earth fault and reports to the police.
5. system according to claim 2, it is characterized in that: the feeder line monitoring means described in system is after producing doubtful earth fault warning, by wireless synchronization flip flop equipment, trigger other two-phase, described wireless synchronization flip flop equipment can be used infrared ray, sound, ultrasound wave, magnetic field, electromagnetic field is as trigger pip, directly be sent to all the other two-phases, or be first sent to an adjacent phase, by adjacent, transferred to the other phase in three-phase again, or be first sent to adjacent radio communication terminal, by communication terminal device, be sent to all the other two-phases in three-phase again, notify all the other two-phases to upload voltage, current waveform data, be used for calculating residual voltage and zero sequence current signal detection of ground faults, simultaneously wireless synchronization flip flop equipment can also carry out carrying out between different described equipment synchronously to time.
6. system according to claim 2, it is characterized in that: system can be comprised of feeder line monitoring means, communication terminal, system main website, each communication terminal connects one or more groups three-phase feeder line monitoring means, between communication terminal and three-phase feeder line monitoring means, adopt time division multiplexing wireless communication mode, form cordless communication network, between communication terminal and system main website, by GSM/GPRS, CDMA, WIFI, Ethernet, communicate; System can be comprised of feeder line monitoring means, system main website, when one in three-phase feeder line monitoring means is mutually as identical in B also as communication terminal, and adopt time division multiplexing wireless communication mode between other two-phase feeder line monitoring means, form cordless communication network, between this phase feeder line monitoring means and system main website, by GSM/GPRS, CDMA, WIFI, Ethernet, communicate simultaneously; System can be comprised of feeder line monitoring means, communication terminal, system main website, in three-phase feeder line monitoring means one is mutually as B phase, and adopt time division multiplexing wireless communication mode between other two-phase feeder line monitoring means, form cordless communication network, between this phase feeder line monitoring means and communication terminal, use another one radio band simultaneously, adopt time division multiplexing wireless communication mode, form cordless communication network, each communication terminal connects a plurality of feeder line monitoring means, between communication terminal and system main website, by GSM/GPRS, CDMA, WIFI, Ethernet, communicates.
7. system according to claim 2, it is characterized in that: system main website and communication terminal adopt GPS time service, feeder line monitoring means is when making communication terminal, can adopt GPS time service, common feeder line monitoring means by time division multiplexing wireless communication network carry out to time, adopt GPS time service and time division multiplexing wireless communication network to time combine, realize system accurately to time.
8. system according to claim 2, is characterized in that: system main website platform software, converge voltage, the current waveform data of each position three-phase feeder line monitoring means of power distribution network, and calculate residual voltage, the zero-sequence current of each position.System main website platform software, residual voltage from each position of calculating, in zero-sequence current, extract each position zero sequence voltage, the steady-state signal of zero-sequence current, computation of characteristic values, comprise: amplitude, mean value, differential value, integrated value and combination thereof, each position stable state zero sequence active power, zero sequence reactive power, calculate each position stable state residual voltage, the similarity of zero sequence current signal waveform, according to faulty line and non-fault line at stable state residual voltage, difference on zero-sequence current eigenwert and waveform similarity, carry out the screening of faulty line and non-fault line.
9. system according to claim 2, it is characterized in that: system main website platform software, residual voltage from each position of calculating, in zero-sequence current, extract each position zero sequence voltage, the transient signal of zero-sequence current, computation of characteristic values, comprise: amplitude, mean value, differential value, integrated value and combination thereof, each position transient state zero sequence active power, zero sequence reactive power, calculate each position transient state residual voltage, the similarity of zero sequence current signal waveform, according to before and after earth fault at transient state residual voltage, difference on zero-sequence current eigenwert and waveform similarity, to each position, each position on the doubtful faulty line particularly filtering out, preferentially judge, location earth fault.
10. system according to claim 2, it is characterized in that: system main website platform software is after orienting earth fault, can accept manually to carry out secondary checks, determine final earth fault, on GIS map, demonstrate earth fault, simultaneity factor main website platform software, by time division multiplexing wireless communication network, issues earth fault signal and indicates to feeder line monitoring means, is convenient to artificial line walking location earth fault.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310120519.9A CN104101812B (en) | 2013-04-09 | 2013-04-09 | Single-phase grounding fault detection and positioning method and system for low-current grounding power distribution network |
| RS20220345A RS63098B1 (en) | 2013-03-29 | 2014-03-27 | Method and system for detecting and locating single-phase ground fault on low current grounded power-distribution network |
| US14/774,123 US10222409B2 (en) | 2013-03-29 | 2014-03-27 | Method and system for detecting and locating single-phase ground fault on low current grounded power-distribution network |
| EP14772927.1A EP2985613B1 (en) | 2013-03-29 | 2014-03-27 | Method and system for detecting and locating single-phase ground fault on low current grounded power-distribution network |
| PCT/CN2014/074206 WO2014154164A1 (en) | 2013-03-29 | 2014-03-27 | Method and system for detecting and locating single-phase ground fault on low current grounded power-distribution network |
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| CN201310120519.9A CN104101812B (en) | 2013-04-09 | 2013-04-09 | Single-phase grounding fault detection and positioning method and system for low-current grounding power distribution network |
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