CN104764981B - Distribution line fault section location method based on normalized excursion degree - Google Patents
Distribution line fault section location method based on normalized excursion degree Download PDFInfo
- Publication number
- CN104764981B CN104764981B CN201510209669.6A CN201510209669A CN104764981B CN 104764981 B CN104764981 B CN 104764981B CN 201510209669 A CN201510209669 A CN 201510209669A CN 104764981 B CN104764981 B CN 104764981B
- Authority
- CN
- China
- Prior art keywords
- mrow
- msub
- fault
- msup
- section
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Locating Faults (AREA)
Abstract
The invention discloses a kind of distribution line fault section location method based on normalized excursion degree, 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 normalized excursion degree 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
The present invention relates to distribution network line fault diagnostic method, specifically a kind of distribution line based on normalized excursion degree
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 matching somebody with somebody based on normalized excursion degree
Netting twine road 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.
The step of the present invention：
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, defines two test point phase current variable quantities
In formula, N=0.02fs, it is a periodic sampling point.To reduce shadow of the fault resistance to localization method sensitivity
Ring, using the quadratic sum of smaller current as braking amount, therefore define normalized excursion degree
It is used as the measurement index of phase current variable quantity otherness.Analyzed according to upper section, be apparent from the d of non-faulting sectionp.u.Connect
It is bordering on 0, the d of fault sectionp.u.For 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：After the generation of earth fault is detected, changed according to phase voltage
Rule, selects failure phase, is mutated the moment according to phase voltage or the arc-extinction device chugging moment determines fault moment tf；
Step S2, because the operation time limit of automatic tracking and compensating arc distinction device is 2~5 cycles, after wherein failure occurs
A cycle internal fault information is most abundant, therefore chooses a cycle, i.e. [t before and after detection means failuref- 0.02s, tf+
0.02s] it is interval in common 2N point faulted phase current Wave data, if being designated as zero under the data point at failure generation moment, calculate
Normalized excursion degree dp.u., 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, N is that a periodic sampling is counted；
Step S3, judges whether each section is fault section according to normalized excursion degree size, that is, works as dp.u.＞ dp.u.set,
It is judged as fault section, otherwise is non-faulting section, wherein, dp.u.setFor the action threshold value artificially set, 1~2 is taken；
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.
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, standardization
The threshold value of 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 Wave data of totally 800 points in each detection means [0,69,0.73] interval
(setting failure to occur to be designated as zero under the data point at moment), according to the definition of normalized excursion degree, calculates dp.u., as a result such as the institute of table 1
Show, 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 normalized excursion degree of section 2. meets dp.u.>1, it is judged as its fault section；Conversely, section is 1., 3.
For non-faulting section.
Claims (3)
1. a kind of distribution line fault section location method based on normalized excursion degree, it is characterised in that methods described includes
Following steps：
Step S1, determines failure phase and fault moment tf；
Step S2, chooses detection means [tf- 0.02s, tf+ 0.02s] it is interval in common 2N point faulted phase current Wave data,
If failure occurs to be designated as zero, normalized drift rate d under the data point at momentp.u., formula is as follows：
<mrow>
<msub>
<mi>d</mi>
<mrow>
<mi>p</mi>
<mo>.</mo>
<mi>u</mi>
<mo>.</mo>
</mrow>
</msub>
<mo>=</mo>
<msup>
<mrow>
<mo>&lsqb;</mo>
<mfrac>
<mrow>
<munderover>
<mo>&Sigma;</mo>
<mrow>
<mi>n</mi>
<mo>=</mo>
<mn>1</mn>
</mrow>
<mi>N</mi>
</munderover>
<msup>
<mrow>
<mo>&lsqb;</mo>
<msub>
<mi>&Delta;i</mi>
<mrow>
<mn>1</mn>
<mi>A</mi>
</mrow>
</msub>
<mrow>
<mo>(</mo>
<mi>n</mi>
<mo>)</mo>
</mrow>
<mo>-</mo>
<msub>
<mi>&Delta;i</mi>
<mrow>
<mn>2</mn>
<mi>A</mi>
</mrow>
</msub>
<mrow>
<mo>(</mo>
<mi>n</mi>
<mo>)</mo>
</mrow>
<mo>&rsqb;</mo>
</mrow>
<mn>2</mn>
</msup>
</mrow>
<mrow>
<mi>m</mi>
<mi>i</mi>
<mi>n</mi>
<mo>{</mo>
<munderover>
<mo>&Sigma;</mo>
<mrow>
<mi>n</mi>
<mo>=</mo>
<mn>1</mn>
</mrow>
<mi>N</mi>
</munderover>
<msub>
<mi>&Delta;i</mi>
<mrow>
<mn>1</mn>
<mi>A</mi>
</mrow>
</msub>
<msup>
<mrow>
<mo>(</mo>
<mi>n</mi>
<mo>)</mo>
</mrow>
<mn>2</mn>
</msup>
<mo>,</mo>
<munderover>
<mo>&Sigma;</mo>
<mrow>
<mi>n</mi>
<mo>=</mo>
<mn>1</mn>
</mrow>
<mi>N</mi>
</munderover>
<msub>
<mi>&Delta;i</mi>
<mrow>
<mn>2</mn>
<mi>A</mi>
</mrow>
</msub>
<msup>
<mrow>
<mo>(</mo>
<mi>n</mi>
<mo>)</mo>
</mrow>
<mn>2</mn>
</msup>
<mo>}</mo>
</mrow>
</mfrac>
<mo>&rsqb;</mo>
</mrow>
<mfrac>
<mn>1</mn>
<mn>2</mn>
</mfrac>
</msup>
</mrow>
In formula, Δ i1A(n)、Δi2A(n) it is respectively two test point phase current variable quantities, formula is as follows：
<mrow>
<mfenced open='' close=''>
<mtable>
<mtr>
<mtd>
<msub>
<mi>&Delta;i</mi>
<mrow>
<mn>1</mn>
<mi>A</mi>
</mrow>
</msub>
<mrow>
<mo>(</mo>
<mi>n</mi>
<mo>)</mo>
</mrow>
<mo>=</mo>
<msub>
<mi>i</mi>
<mrow>
<mn>1</mn>
<mi>A</mi>
</mrow>
</msub>
<mrow>
<mo>(</mo>
<mi>n</mi>
<mo>)</mo>
</mrow>
<mo>-</mo>
<msub>
<mi>i</mi>
<mrow>
<mn>1</mn>
<mi>A</mi>
</mrow>
</msub>
<mrow>
<mo>(</mo>
<mi>n</mi>
<mo>-</mo>
<mi>N</mi>
<mo>)</mo>
</mrow>
</mtd>
</mtr>
<mtr>
<mtd>
<msub>
<mi>&Delta;i</mi>
<mrow>
<mn>2</mn>
<mi>A</mi>
</mrow>
</msub>
<mrow>
<mo>(</mo>
<mi>n</mi>
<mo>)</mo>
</mrow>
<mo>=</mo>
<msub>
<mi>i</mi>
<mrow>
<mn>2</mn>
<mi>A</mi>
</mrow>
</msub>
<mrow>
<mo>(</mo>
<mi>n</mi>
<mo>)</mo>
</mrow>
<mo>-</mo>
<msub>
<mi>i</mi>
<mrow>
<mn>2</mn>
<mi>A</mi>
</mrow>
</msub>
<mrow>
<mo>(</mo>
<mi>n</mi>
<mo>-</mo>
<mi>N</mi>
<mo>)</mo>
</mrow>
</mtd>
</mtr>
</mtable>
</mfenced>
<mo>,</mo>
<mi>n</mi>
<mo>&Element;</mo>
<mo>[</mo>
<mn>0</mn>
<mo>,</mo>
<mi>N</mi>
<mo>-</mo>
<mn>1</mn>
<mo>]</mo>
</mrow>
In formula, i1A(n)、i2A(n) it is the phase current sampling sequence of adjacent test point, N is that a periodic sampling is counted；
Step S3, judges whether each section is fault section according to normalized excursion degree size, that is, works as dp.u.＞ dp.u.set, judge
For fault section, on the contrary 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 line fault section location method according to claim 1, it is characterised in that the step S1 includes：
After the generation of earth fault is detected, according to phase voltage changing rule, failure phase is selected, the moment is mutated according to phase voltage
Or the arc-extinction device chugging moment determines fault moment tf。
3. distribution line fault section location method according to claim 1, it is characterised in that d in the step S3p.u.set
For action threshold value, 1~2 is taken.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510209669.6A CN104764981B (en) | 2015-04-28 | 2015-04-28 | Distribution line fault section location method based on normalized excursion degree |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510209669.6A CN104764981B (en) | 2015-04-28 | 2015-04-28 | Distribution line fault section location method based on normalized excursion degree |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104764981A CN104764981A (en) | 2015-07-08 |
| CN104764981B true CN104764981B (en) | 2017-09-12 |
Family
ID=53646934
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510209669.6A Active CN104764981B (en) | 2015-04-28 | 2015-04-28 | Distribution line fault section location method based on normalized excursion degree |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104764981B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109765467B (en) * | 2019-01-16 | 2021-07-16 | 深圳供电局有限公司 | Direct-current power distribution system and ground insulation fault detection method thereof |
| CN109814011B (en) * | 2019-01-16 | 2021-07-16 | 深圳供电局有限公司 | Direct-current power distribution system and ground insulation fault detection method thereof |
| 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 |
| CN112255499B (en) * | 2020-10-10 | 2021-09-07 | 重庆大学 | Phase current amplitude based power distribution network disconnection fault positioning and identifying method and system |
| 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 |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6466030B2 (en) * | 2000-12-29 | 2002-10-15 | Abb Power Automation Ltd. | Systems and methods for locating faults on a transmission line with a single tapped load |
| CN101201380A (en) * | 2006-12-11 | 2008-06-18 | 淄博科汇电气有限公司 | Method for faulty orientation and subsection of power system low current grounding |
| EP2530804A1 (en) * | 2011-06-01 | 2012-12-05 | ABB Research Ltd. | Improved ground fault handling in power distribution systems with mixed underground and aerial power lines |
| CN102944814A (en) * | 2012-11-28 | 2013-02-27 | 福建省电力有限公司 | Power distribution network single-phase earth fault locating method based on transient state |
| CN103217625A (en) * | 2013-03-20 | 2013-07-24 | 山东理工大学 | Low current earth fault location method based on transient state current waveform comparison |
| CN104155582A (en) * | 2014-08-29 | 2014-11-19 | 上海交通大学 | Distribution network line fault section positioning method based on full-waveform information |
-
2015
- 2015-04-28 CN CN201510209669.6A patent/CN104764981B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6466030B2 (en) * | 2000-12-29 | 2002-10-15 | Abb Power Automation Ltd. | Systems and methods for locating faults on a transmission line with a single tapped load |
| CN101201380A (en) * | 2006-12-11 | 2008-06-18 | 淄博科汇电气有限公司 | Method for faulty orientation and subsection of power system low current grounding |
| EP2530804A1 (en) * | 2011-06-01 | 2012-12-05 | ABB Research Ltd. | Improved ground fault handling in power distribution systems with mixed underground and aerial power lines |
| CN102944814A (en) * | 2012-11-28 | 2013-02-27 | 福建省电力有限公司 | Power distribution network single-phase earth fault locating method based on transient state |
| CN103217625A (en) * | 2013-03-20 | 2013-07-24 | 山东理工大学 | Low current earth fault location method based on transient state current waveform comparison |
| CN104155582A (en) * | 2014-08-29 | 2014-11-19 | 上海交通大学 | Distribution network line fault section positioning method based on full-waveform information |
Non-Patent Citations (2)
| Title |
|---|
| Distributed Fault Location Based on Comprehensive Analysis of Fault Current;Yadong Liu et al.;《2012 IEEE International Conference on Condition Monitoring and Diagnosis》;20120927;第999-1002页 * |
| 基于相电流突变量的配电网单相接地故障区段定位;宋国兵 等;《电力系统自动化》;20111110;第35卷(第21期);第84-90页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104764981A (en) | 2015-07-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104793106B (en) | Distribution line fault section location method based on current break rate | |
| CN104155582B (en) | Distribution line fault section location method based on Full wave shape information | |
| CN104764981B (en) | Distribution line fault section location method based on normalized excursion degree | |
| CN106646139B (en) | A kind of electrical power distribution network fault location method based on three-phase current amplitude analysis | |
| CN106707084B (en) | A kind of single-phase grounded malfunction in grounded system of low current determination method | |
| CN103728538B (en) | A kind of ground fault line selecting method of small current neutral grounding system | |
| CN106771870A (en) | A kind of distribution net work earthing fault localization method and system | |
| CN101201379B (en) | Method for faulty indication and subsection of power system low current grounding | |
| CN108254657A (en) | Power distribution network section with low-current ground faults localization method based on Study of Transient Energy | |
| CN102590703B (en) | Single-phase grounding failure route selection method of resonance grounding system based on zero-sequence transient charge | |
| CN101975911B (en) | Earth fault judging method for overhead line fault indicator | |
| CN102064537B (en) | Method for judging and processing single-phase earth faults by using electronic mutual inductor | |
| CN106841923A (en) | Distribution network line fault localization method based on difference Convolution Analysis method | |
| CN102565626A (en) | On-line positioning method and system of section with low-current ground faults | |
| CN106093714A (en) | The selection method of single-phase grounded malfunction in grounded system of low current circuit | |
| CN107045093B (en) | Low-current single-phase earth fault line selection method based on quick S-transformation | |
| CN104808112B (en) | Distribution line fault section location method based on section instantaneous power | |
| CN104215881B (en) | Voltage sag source locating method based on sequence disturbing active current direction | |
| CN104898017B (en) | Distribution network line fault Section Location based on Euclidean distance | |
| CN104267310A (en) | Voltage dip source positioning method based on disturbance power direction | |
| CN205333777U (en) | Phase to earth fault positioner | |
| CN104865496B (en) | Distribution line fault section location method based on differential offset degree | |
| CN104808110B (en) | Distribution line fault section location method based on wide area differential drift rate | |
| CN108957234A (en) | Power distribution network earthing wire-selecting method and system based on volume measuring point and failure longitudinal direction feature | |
| CN105044550A (en) | Distribution network line fault positioning method based on fault current discharge path |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| EXSB | Decision made by sipo to initiate substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |