CN104808110B - Distribution line fault section location method based on wide area differential drift rate - Google Patents
Distribution line fault section location method based on wide area differential drift rate Download PDFInfo
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- CN104808110B CN104808110B CN201510209668.1A CN201510209668A CN104808110B CN 104808110 B CN104808110 B CN 104808110B CN 201510209668 A CN201510209668 A CN 201510209668A CN 104808110 B CN104808110 B CN 104808110B
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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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Abstract
The invention discloses a kind of distribution line fault section location method based on wide area differential drift rate, for earth fault, by analyzing phase current feature of the faulted phase current before failure generation is preceding and failure occurs to arc suppression coil to act, fault characteristic value is therefrom extracted, and is positioned using the waveform wide area differential drift rate of overall process.The present invention only needs the faulted phase current of measurement circuitry, scheme is simple, strong applicability, the problem of faint fault current during the single-phase grounded malfunction in grounded system of low current of current generally existing, poor reliability, low sensitivity can be solved very well, disturbed while will not be introduced to system.
Description
Technical field
It is specifically a kind of that netting twine is matched somebody with somebody based on wide area differential drift rate the present invention relates to distribution network line fault diagnostic method
Road fault section location method.
Background technology
According to statistics, in the process of running, the power outage caused by Distribution Network Failure accounts for total power outage for power system
More than 95%, wherein 70% accident is triggered by singlephase earth fault or bus-bar fault.And distribution neutral point is adopted extensively both at home and abroad
With non-effective earthing (small current neutral grounding) mode, to avoid occurring causing power failure during singlephase earth fault.For distribution
Singlephase earth fault, because fault characteristic value is faint, lacks reliable fault line selection and fault locating method always.With people to
The raising of automation level requirement, more in the urgent need to the fault-location problem for fundamentally solving distribution.
The Fault Locating Method that current domestic and foreign scholars are proposed is roughly divided into two classes：One is injecting signal, and two be to be based on
The section positioning of fault characteristic value.Injecting signal includes " S " injection method, alternating current-direct current and integrates injection method and parallel medium resistance method,
Such method increases the interference to system, and can not detect instantaneity and intermittent grounding fault.Based on fault characteristic value
Section positioning include zero mould electric current comparison method, section zero sequence admittance method, zero sequence reactive power direction method, based on difference of phase currents
Positioning, residual method of addition, traveling wave method etc., electrical power distribution automatization system mainly realizes FTU time synchronized using main website, to mistiming
Difference is at least several milliseconds.In the case, the method such as to compare no longer valid for the amplitude of transient signal, polarity, Waveform Correlation.
Current localization method have ignored the utilization to information before failure only using the data after failure generation.Meanwhile,
Most of localization methods only consider zero-sequence current information (needing three phase informations), high to transformer request, and acquisition of information is complicated, and
These methods will fail in the case of data phase shortage.
The content of the invention
It is an object of the invention to overcome above-mentioned the deficiencies in the prior art, it is proposed that a kind of based on wide area differential drift rate
Distribution line fault section location method.
The principle of the present invention：
If failure is mutually A phases, test point phase voltage is before failurePhase voltage is after failureBy Fig. 1, the two is apparent from
Meet
1) test point 1,2 is located at trouble point heteropleural
Trouble point upstream detection point electric current is after failure
In formula,Respectively A phase load electric currents, capacitance current and fault current.Wherein
In formula,For capacitance current before failure.Assuming that a cycle internal loading electric current is constant before and after failure occurs, i.e.,
Simultaneous above-mentioned formula is obtained
Arc suppression coil offsets the inductive current produced using neutral point voltage during failure come bucking-out system capacitance current, ground connection
Point residual flow (fault current) is represented by
In formula, CΣFor the whole network line mutual-ground capacitor.Failure occur and in the arc suppression coil not operating period, | ZL| it is very big,
Arc suppression coil compensation effect is negligible.Then have
Similarly, trouble point downstream test point phase current after failure
Variable quantity
It can be seen that, trouble point heteropleural test point curent change feature is inconsistent, is embodied in size, phase.
2) test point 1,2 is located at trouble point homonymy
If test point is respectively positioned on trouble point upstream, analyzes, have according in 1)
If test point is respectively positioned on trouble point downstream, have
Because the difference of adjacent test point electric capacity is section electric capacity, its numerical value very little, therefore 2 curent change features are basic
Unanimously.
If i1A(n)、i2A(n) it is the phase current sampling sequence of adjacent test point.Failure is made to occur the data point subscript at moment
It is zero, to ensure data volume length enough, so as to increase fault characteristic value, the present invention chooses the difference of the three cycle time differences, i.e., fixed
Adopted two test point phase current variable quantities
In formula, N=0.02fs, it is a periodic sampling point.Define wide area differential drift rate
It is used as the measurement index of phase current variable quantity otherness.Analyzed according to upper section, the wdiff for being apparent from non-faulting section connects
0 is bordering on, the wdiff of fault section is a positive number more than 0.
The technical solution of the present invention is as follows：
A kind of distribution network line fault Section Location, its feature is, the described method comprises the following steps：
Step S1, determines failure phase and fault moment tf：System detectio becomes to after the generation of earth fault according to phase voltage
Law, selects failure phase, is mutated the moment according to phase voltage or the arc-extinction device chugging moment determines fault moment tf；
Step S2, chooses detection means [tf- 0.06s, tf+ 0.06s] it is interval in common 6N point faulted phase current waveform
Data, if failure occurs to be designated as zero under the data point at moment, calculate wide area differential drift rate wdiff, formula is as follows：
In formula, Δ i1A(n)、Δi2A(n) it is respectively two test point phase current variable quantities, formula is as follows：
In formula, i1A(n)、i2A(n) it is the phase current sampling sequence of adjacent test point；
Step S3, judges whether each section is fault section, i.e., as wdiff ＞ according to wide area differential drift rate size
wdiffset, it is judged as fault section, otherwise be non-faulting section, wherein wdiffsetFor the action threshold value artificially set, 0.1 is taken
~1；
Step S4, according to the distributing position of network topology structure and test point on the line, is traveled through successively, until finding out event
Untill hindering section, so as to realize fault section location.
Compared with prior art, the beneficial effects of the invention are as follows：To earth fault, by analyzing faulted phase current in failure
Occur preceding and failure and occur to arc suppression coil the phase current feature before acting, therefrom extract fault characteristic value, and use overall process
Waveform Euclidean distance positioned.Thus, it is only required to which the faulted phase current of measurement circuitry, only considers that zero sequence (is needed before having broken
Want three phase informations) tradition, data acquisition is simple, strong applicability；From the point of view of signal synchronization, total system, which is used, passes through GPS
Synchronous Monitoring Data so that the difference between different test points is sensitiveer.The small electricity of current generally existing can be solved very well
Fault current is faint when flowing single-phase grounded malfunction in grounded system, poor reliability, low sensitivity the problem of, while will not draw to system
Enter interference.
Brief description of the drawings
Fig. 1 is single-phase earthing of small current earthing system schematic diagram
Fig. 2 is distributed fault section positioning system structure figure
Fig. 3 is 10kV system emulation figures
Fig. 4 is current change quantity waveform along earth fault
Embodiment
The required fault waveform of the present invention comes from distributed fault section alignment system, and system architecture is as shown in Figure 2.Match somebody with somebody
Electric network fault section alignment system is by master station, transformer station's (bus) measurement apparatus and is distributed in the section of distribution line everywhere
Point failure positioner is constituted.Circuit is divided into some sections, each three groups of node installation by fault location node in topology
Measurement apparatus, real-time synchronization collection circuit three-phase current and voltage.
According to the Fault Locating Method of invention, in 10kV power distribution network analogue systems, different types of failure is set.System
Structure chart as shown in figure 3,1., 2., 3. be sector number, failure be arranged on section 2. on.Sample frequency is 20kHz (each cycles
Data point N=400), occurs for failure for 0.7s the moment, and arc-extinction device actuation time is set to 0.04s during earth fault, and wide area is poor
The threshold value of dynamic drift rate is set to 1.
The embodiment citing judged for fault section：
Step S1, system starts according to residual voltage after the generation for detecting earth fault, measures A in bus three-phase voltage
Mutually reduce, B, C phase are raised, and are defined as A phase faults；Determine that fault moment is 0.71s according to the phase voltage mutation moment；
Step S2, chooses the faulted phase current waveform number of totally 2400 points in each detection means [0,65,0.77] interval
According to (setting failure to occur to be designated as zero under the data point at moment), according to the definition of wide area differential drift rate, wdiff is calculated, as a result such as
Shown in table 1, wherein, the failure line current variable quantity waveform that hands down is as shown in Figure 4 during 500 Ω grounding resistances；
The singlephase earth fault simulation result of table 1
Step S3, the wide area differential drift rate of section 2. meets wdiff>1, it is judged as its fault section；Conversely, section
1., 3. it is non-faulting section.
Claims (3)
1. a kind of distribution network line fault Section Location based on wide area differential drift rate, it is characterised in that methods described
Comprise the following steps：
Step S1, determines failure phase and fault moment tf；
Step S2, chooses detection means [tf- 0.06s, tf+ 0.06s] it is interval in common 6N point faulted phase current Wave data,
If failure occurs to be designated as zero under the data point at moment, wide area differential drift rate wdiff is calculated, formula is as follows：
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In formula, Δ i1A(n)、Δi2A(n) it is respectively two test point phase current variable quantities, formula is as follows：
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In formula, i1A(n)、i2A(n) it is the phase current sampling sequence of adjacent test point；
Step S3, judges whether each section is fault section, i.e., as wdiff ＞ wdiff according to wide area differential drift rate sizeset,
It is judged as fault section, otherwise is non-faulting section；
Step S4, according to the distributing position of network topology structure and test point on the line, is traveled through, until finding out faulty section successively
Untill section.
2. distribution network line fault Section Location according to claim 1, it is characterised in that the step S1 bags
Include：
System detectio, according to phase voltage changing rule, selects failure phase, when being mutated according to phase voltage to after the generation of earth fault
Carve or the arc-extinction device chugging moment determines fault moment tf。
3. distribution network line fault Section Location according to claim 1, it is characterised in that in the step S3,
wdiffsetFor the action threshold value artificially set, 0.1~1 is taken.
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| CN111596170A (en) * | 2020-05-27 | 2020-08-28 | 国网上海市电力公司 | Fault diagnosis comprehensive positioning method for intelligent distribution network |
| CN114089123A (en) * | 2021-12-06 | 2022-02-25 | 国网上海市电力公司 | Fault positioning method, system and storage medium based on phase current time domain characteristics |
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