CN106443332A - Small current grounding system fault positioning method - Google Patents
Small current grounding system fault positioning method Download PDFInfo
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- CN106443332A CN106443332A CN201610812984.2A CN201610812984A CN106443332A CN 106443332 A CN106443332 A CN 106443332A CN 201610812984 A CN201610812984 A CN 201610812984A CN 106443332 A CN106443332 A CN 106443332A
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- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000001514 detection method Methods 0.000 claims abstract description 18
- 238000001228 spectrum Methods 0.000 claims abstract description 12
- 238000004458 analytical method Methods 0.000 claims abstract description 4
- 230000007935 neutral effect Effects 0.000 claims description 13
- 230000004807 localization Effects 0.000 claims description 6
- 230000001052 transient effect Effects 0.000 claims description 6
- 238000000354 decomposition reaction Methods 0.000 claims description 3
- 238000012423 maintenance Methods 0.000 abstract description 2
- 238000013024 troubleshooting Methods 0.000 abstract description 2
- 230000005611 electricity Effects 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 4
- 230000015556 catabolic process Effects 0.000 description 4
- 230000001629 suppression Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000007689 inspection Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000007257 malfunction Effects 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007726 management method Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000035772 mutation Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Locating Faults (AREA)
Abstract
The invention relates to a small current grounding system fault positioning method which comprises the following steps: according to the energy spectrum entropy of the highest frequency intrinsic function component of each detection point, obtaining the energy spectrum entropy factor value of the highest frequency intrinsic mode function component of each detection section wherein each detection point is defined as follows: the detection point at the outlet of a bus as detection point 1, the adjacent detection point to detection point 1 as detection point 2, and the detection point number is sequentially added, and the last detection point is set as the detection point n; using the fuzzy C-means clustering method to perform clustering analysis on the sample set data formed by the energy spectrum entropy factors; and determining the class with the largest number of sections as the perfect class, that is, the perfect class; and determining the class with the smallest number of sections as the faulty class, that is, the faulty sections. The positioning method of the invention improves the accuracy and efficiency of the fault judgment, reduces the running operation cost and the daily maintenance cost, can help people understand the troubled condition in time, and quickly determines the fault location so as to enable them to carry out data inquiry and get involved in the troubleshooting work.
Description
Technical field
The present invention relates to a kind of low current fault localization method, more particularly to a kind of low current neutral grounding system fault positioning side
Method, belongs to electric power application.
Background technology
In the electrical power trans mission/distribution system of China, mainly using isolated neutral or the small current neutral grounding through grounding through arc
System.
When small current neutral grounding system transmission line of electricity breaks down, due to fault parameter complexity, breakdown judge is extremely difficult, mesh
Front 60%-70% can only achieve for singlephase earth fault judging nicety rate.In addition, single-phase earthing permanent fault is typically by short-term
Instant earthing fault causes, so the fault point positioning method of the ultra-high-tension power transmission line that follows conventional lines, he using steady during single-phase earthing
State fault component is the drawbacks of fundamental component has certain as failure criterion.
Although conventional failure localization method detection earth fault employ the measures such as current/voltage mutation time delay and hide such as
The current/voltage impact that circuit re-switching etc. is caused, but breakdown judge fault rate is higher in actual applications, especially to little electricity
Stream earthed system is even more so.
Content of the invention
The present invention is directed to above-mentioned problems of the prior art, provides a kind of low current neutral grounding system fault positioning side
Method, solves the problems, such as that in prior art, breakdown judge fault rate is higher.
Technical scheme comprises the steps：
Step 1, when there is singlephase earth fault in small current neutral grounding system, record previous cycle in singlephase earth fault moment with
Zero mould electric current of a cycle afterwards；
Step 2, by the transient zero mode current fault component in singlephase earth fault moment after empirical mode decomposition, select highest
Frequency intrinsic mode function component；
Step 3, the power spectrum entropy according to each test point most high frequency intrinsic mode function component, obtain each detector segments most high frequency sheet
Levy mode function component Energy Spectrum Entropy factor values；The definition of each test point is that the test point in bus exit is set to test point 1, phase
Adjacent test point is set to test point 2, and test point numbering is progressively increased successively, and last test point is set to test point n；
Step 4, the sample set data for constituting Energy Spectrum Entropy factor values carry out cluster analyses through fuzzy C-means clustering method, will go out
That most class of existing number of sections is judged to perfect class, that is, perfect section, will appear from that minimum class of number of sections and judges
For failure classes, i.e. fault section.
In described step 2, when the transient zero mode current fault component in singlephase earth fault moment is the single-phase fault
The zero mould difference between currents in zero mould electric current of a cycle and previous cycle in the single-phase fault moment after quarter.
In described step 3, according to the line equivalent parameter determination fault section of each test point identification, when two neighboring inspection
When line equivalent parameter that measuring point is detected is inconsistent, fault is Wei Yu two test points between；Circuit when the detection of all test points
When equivalent parameterss are all electric capacity, trouble point is Wei Yu bus and first test point between；Circuit when the detection of all test points etc.
When effect parameter is all inductance, trouble point is Wei Yu last test point and line end between.
Advantages of the present invention effect is as follows：
Improve breakdown judge accuracy rate and work efficiency, reduce production run cost and regular maintenance expense, can understand in time
Malfunction, quickly determine abort situation, carry out data query, participate in troubleshooting process.For the management personnel using mobile phone,
Can be using mobile phone as terminal, real-time reception fault message.Can be according to transmission line of electricity reasonable installation malfunction monitoring terminal, without the need for installing
Surveillance center's control platform, reduces installation cost, while the labor intensity of workman will be greatly reduced, raises labour efficiency, therefore
Barrier locating accuracy is greatly improved.
Specific embodiment
Embodiment
Step 1, when there is singlephase earth fault in small current neutral grounding system, record previous week in singlephase earth fault moment
Zero mould electric current of phase and rear a cycle；
Step 2, by the transient zero mode current fault component in singlephase earth fault moment after empirical mode decomposition, select highest
Frequency intrinsic mode function component；
Step 3, the power spectrum entropy according to each test point most high frequency intrinsic mode function component, obtain each detector segments most high frequency sheet
Levy mode function component Energy Spectrum Entropy factor values；The definition of each test point is that the test point in bus exit is set to test point 1, phase
Adjacent test point is set to test point 2, and test point numbering is progressively increased successively, and last test point is set to test point n；
Step 4, the sample set data for constituting Energy Spectrum Entropy factor values carry out cluster analyses through fuzzy C-means clustering method, will go out
That most class of existing number of sections is judged to perfect class, that is, perfect section, will appear from that minimum class of number of sections and judges
For failure classes, i.e. fault section.
Also include before described step 1, judge the residual voltage of small current neutral grounding system whether more than the specified electricity of bus
Pressure；Judge whether voltage transformer breaks；Judge whether arc suppression coil occurs series resonance, when arc suppression coil occurs series resonance
When, then arc suppression coil is adjusted to prevent which from series resonance occurring；When arc suppression coil does not occur series resonance, then judge little electricity
There is singlephase earth fault in stream earthed system.
In described step 2, when the transient zero mode current fault component in singlephase earth fault moment is the single-phase fault
The zero mould difference between currents in zero mould electric current of a cycle and previous cycle in the single-phase fault moment after quarter.
In described step 3, according to the line equivalent parameter determination fault section of each test point identification, when two neighboring inspection
When line equivalent parameter that measuring point is detected is inconsistent, fault is Wei Yu two test points between；Circuit when the detection of all test points
When equivalent parameterss are all electric capacity, trouble point is Wei Yu bus and first test point between；Circuit when the detection of all test points etc.
When effect parameter is all inductance, trouble point is Wei Yu last test point and line end between.
Claims (3)
1. low current neutral grounding system fault localization method, it is characterised in that comprise the steps：
Step 1, when there is singlephase earth fault in small current neutral grounding system, record previous cycle in singlephase earth fault moment with
Zero mould electric current of a cycle afterwards；
Step 2, by the transient zero mode current fault component in singlephase earth fault moment after empirical mode decomposition, select highest
Frequency intrinsic mode function component；
Step 3, the power spectrum entropy according to each test point most high frequency intrinsic mode function component, obtain each detector segments most high frequency sheet
Levy mode function component Energy Spectrum Entropy factor values；The definition of each test point is that the test point in bus exit is set to test point 1, phase
Adjacent test point is set to test point 2, and test point numbering is progressively increased successively, and last test point is set to test point n；
Step 4, the sample set data for constituting Energy Spectrum Entropy factor values carry out cluster analyses through fuzzy C-means clustering method, will go out
That most class of existing number of sections is judged to perfect class, that is, perfect section, will appear from that minimum class of number of sections and judges
For failure classes, i.e. fault section.
2. low current neutral grounding system fault localization method according to claim 1, it is characterised in that in described step 2,
The transient zero mode current fault component in singlephase earth fault moment is zero mould electric current of a cycle after the single-phase fault moment
The zero mould difference between currents with the previous cycle in the single-phase fault moment.
3. low current neutral grounding system fault localization method according to claim 1, it is characterised in that in described step 3,
According to the line equivalent parameter determination fault section of each test point identification, when the line equivalent that two neighboring test point is detected is joined
When number is inconsistent, fault is Wei Yu two test points between；When the line equivalent parameter of all test points detection is all electric capacity, fault
Point is between bus and first test point；When the line equivalent parameter of all test points detection is all inductance, trouble point
Between last test point and line end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610812984.2A CN106443332A (en) | 2016-09-09 | 2016-09-09 | Small current grounding system fault positioning method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610812984.2A CN106443332A (en) | 2016-09-09 | 2016-09-09 | Small current grounding system fault positioning method |
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| Publication Number | Publication Date |
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| CN106443332A true CN106443332A (en) | 2017-02-22 |
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| CN201610812984.2A Pending CN106443332A (en) | 2016-09-09 | 2016-09-09 | Small current grounding system fault positioning method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109061400A (en) * | 2018-10-30 | 2018-12-21 | 国网江苏省电力有限公司电力科学研究院 | A kind of method for locating single-phase ground fault and its device based on transient current frequency range feature |
| WO2019062898A1 (en) * | 2017-09-29 | 2019-04-04 | 中兴通讯股份有限公司 | Method and device for locating video service fault, and storage medium |
| CN109856506A (en) * | 2019-01-17 | 2019-06-07 | 陕西科技大学 | Singlephase earth fault area positioning method based on the adjoint point method of difference |
| CN110579690A (en) * | 2019-10-29 | 2019-12-17 | 厦门理工学院 | Positioning method for small current ground fault section of power distribution network |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102621449A (en) * | 2012-03-16 | 2012-08-01 | 河南理工大学 | Single phase ground fault section locating method in small current grounding system |
| CN102768324A (en) * | 2012-04-10 | 2012-11-07 | 河南理工大学 | Single-phase ground fault section positioning method for low-current grounding system |
| CN102788926A (en) * | 2012-07-04 | 2012-11-21 | 河南理工大学 | Single-phase ground fault section positioning method of small-current ground system |
| CN103245880A (en) * | 2013-04-19 | 2013-08-14 | 国家电网公司 | Small current grounding fault location method utilizing circuit equivalent parameter identification principle |
-
2016
- 2016-09-09 CN CN201610812984.2A patent/CN106443332A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102621449A (en) * | 2012-03-16 | 2012-08-01 | 河南理工大学 | Single phase ground fault section locating method in small current grounding system |
| CN102768324A (en) * | 2012-04-10 | 2012-11-07 | 河南理工大学 | Single-phase ground fault section positioning method for low-current grounding system |
| CN102788926A (en) * | 2012-07-04 | 2012-11-21 | 河南理工大学 | Single-phase ground fault section positioning method of small-current ground system |
| CN103245880A (en) * | 2013-04-19 | 2013-08-14 | 国家电网公司 | Small current grounding fault location method utilizing circuit equivalent parameter identification principle |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019062898A1 (en) * | 2017-09-29 | 2019-04-04 | 中兴通讯股份有限公司 | Method and device for locating video service fault, and storage medium |
| CN109061400A (en) * | 2018-10-30 | 2018-12-21 | 国网江苏省电力有限公司电力科学研究院 | A kind of method for locating single-phase ground fault and its device based on transient current frequency range feature |
| CN109856506A (en) * | 2019-01-17 | 2019-06-07 | 陕西科技大学 | Singlephase earth fault area positioning method based on the adjoint point method of difference |
| CN109856506B (en) * | 2019-01-17 | 2021-07-27 | 陕西科技大学 | Single-phase earth fault area positioning method based on adjacent point difference method |
| CN110579690A (en) * | 2019-10-29 | 2019-12-17 | 厦门理工学院 | Positioning method for small current ground fault section of power distribution network |
| CN110579690B (en) * | 2019-10-29 | 2021-11-23 | 厦门理工学院 | Positioning method for small current ground fault section of power distribution network |
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