CN107462811A - A kind of method positioned using RS fractal dimensions to the trouble point in low current grounding - Google Patents
A kind of method positioned using RS fractal dimensions to the trouble point in low current grounding Download PDFInfo
- Publication number
- CN107462811A CN107462811A CN201710702930.5A CN201710702930A CN107462811A CN 107462811 A CN107462811 A CN 107462811A CN 201710702930 A CN201710702930 A CN 201710702930A CN 107462811 A CN107462811 A CN 107462811A
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- CN
- China
- Prior art keywords
- trouble point
- point
- low current
- grounding
- fractal dimensions
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- 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.)
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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
-
- 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
- G01R31/088—Aspects of digital computing
Abstract
The invention discloses a kind of method positioned using RS fractal dimensions to the trouble point in low current grounding, based on the waveform of the zero sequence transient current of faulty line, enter to be calculated its failure dimension, and by failure dimension and the fitting function of trouble point, select trouble point.A kind of method positioned using RS fractal dimensions to the trouble point in low current grounding of the present invention, the method only needs to gather the zero-sequence current waveform of faulty line, and fitting function is obtained based on historical data, by calculating the trouble point that just can effectively identify in low current grounding, and centering point is earth-free, neutral point is effective by the system of high resistance ground and neutral point by a variety of methods of operation such as grounding through arc.
Description
Technical field
The present invention relates to a kind of Quick method of power system earth fault, more particularly to a kind of small current neutral grounding event
Trouble point method for rapidly positioning in barrier.
Background technology
It is mostly singlephase earth fault in distribution network failure.Operate with failure for a long time, overvoltage easily makes electric power
There is new earth point in equipment, makes fault spread.Therefore it is quick after failure to select to fix a breakdown a little just to seem particularly significant.
Widely used impedance method, traveling wave method, outdoor trouble point detection method etc. in existing power system.
1st, due to being influenceed by grounding resistance, range accuracy is difficult to ensure that impedance method；
2nd, this kind of fault locating methods of traveling wave method are mainly used in the few ultra-high-tension power transmission line of branch, because for multiple-limb
10KV distribution systems, only it is difficult to judge its geographical position with the electrical distance of trouble point.
3rd, sequence electric current is relevant with the distribution capacity size and earthing mode of power network, so outdoor trouble point detection method detection essence
Degree is not high.
The content of the invention
The purpose of the present invention is exactly to overcome the method for existing localization of fault due to easily by grounding resistance, distribution capacity
Influenceed with earthing mode, measurement line branch number is limited the problem of these are present, and proposes one kind using RS fractal dimensions to low current
The method that trouble point in earth fault is positioned.
The technical scheme is that：
The method positioned using RS fractal dimensions to the trouble point in low current grounding, to the zero of faulty line
Sequence current waveform carries out spectrum analysis, selects frequency band 50-2000Hz, calculates its RS fractal dimension, selected according to fitting function
It is out of order a little.Fitting function is the One- place 2-th Order function based on historical data：
Y=ajx2+bjx+cj
In formula：
y：Fault distance accounts for the percentage of total track length；
x：RS dimensions；
j：J-th strip circuit.
It is characteristic of the invention that：
The zero-sequence current waveform of collection faulty line is only needed, and fitting function is obtained based on historical data, is passed through
The trouble point that just can effectively identify in low current grounding is calculated, and centering point is earth-free, neutral point passes through high resistant
The system of ground connection and neutral point by a variety of methods of operation such as grounding through arc is effective.
Brief description of the drawings
Fig. 1 is a kind of method positioned using RS fractal dimensions to the trouble point in low current grounding of the present invention
Theory diagram.
Embodiment
The present invention is further described with reference to the accompanying drawings and examples.
Embodiment 1：
The trouble point in low current grounding is positioned using RS fractal dimensions as shown in figure 1, the present invention is a kind of
Method embodiment by history zero-sequence current waveform and position of failure point importation, faulty line zero-sequence current ripple
Shape importation, transient process waveform selection part, low pass filter part, RS calculating sections, Function Fitting part and judgement
Trouble point part forms.Wherein, history zero-sequence current waveform and position of failure point importation gather the event of certain circuit history
Hinder data yk, k=1,2,3 (fault distance accounts for the percentage of total track length) and zero-sequence fault current waveform are general only to need three
Group can is completed, and similar circuit can mutually use data.Faulty line zero-sequence current Waveform Input part gathers fault wire
The zero-sequence current waveform on road.Short-circuit process is divided into two parts of transient state and stable state by transient process waveform selection part, it is contemplated that
The time of steady-state process is relatively long, regularly changes by sine, and the time of transient process is short, and zero-sequence current change is relative
It hurry up, there is bigger amplitude, be more beneficial for failure line selection, therefore transient process is sampled and amplified.The selection of low pass filter part is temporary
50~2000Hz frequency ranges of state waveform.Because the frequency spectrum of faulty line and non-fault line is mainly distributed in this frequency range.RS is calculated
Part then calculates by the RS fractal dimensions x of history zero sequence transient current waveform obtained in the previous step respectivelyk, k=1,2,3 and failure
The RS fractal dimensions x of circuiti.Its calculating process is to take a series of zero sequence transient current wave-shape amplitude value conducts obtained by sampling
Fractal dimension sequence, according to Hurst laws, the RS fractal dimensions x of faulty line is calculated.Function Fitting part is by the RS of history
Data xk, k=1,2,3 is as input, yk, k=1,2,3 (fault distance accounts for the percentage of total track length), which are used as, to be exported, and is obtained
Fitting function：
Y=ajx2+bjx+cj
Failure judgement point part is then by xiAbove formula is substituted into, obtains trouble point yi。
The method is only needed to gather the zero-sequence current waveform of faulty line, and fitting letter is obtained based on historical data
Number, by calculating the trouble point that just can effectively identify in low current grounding, and centering point is earth-free, neutral point warp
It is effective to cross the system of high resistance ground and neutral point by a variety of methods of operation such as grounding through arc.
Claims (2)
- A kind of 1. method positioned using RS fractal dimensions to the trouble point in low current grounding, it is characterised in that： Spectrum analysis is carried out to the zero-sequence current waveform of faulty line, frequency band 50-2000Hz is selected, calculates its RS fractal dimension, root Trouble point is selected according to fitting function.
- A kind of the trouble point in low current grounding is positioned using RS fractal dimensions 2. according to claim 1 Method, it is characterised in that：Fitting function is the One- place 2-th Order function based on historical data：Y=ajx2+bjx+cjIn formula：y：Fault distance accounts for the percentage of total track length；x：RS dimensions；j：J-th strip circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710702930.5A CN107462811A (en) | 2017-08-16 | 2017-08-16 | A kind of method positioned using RS fractal dimensions to the trouble point in low current grounding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710702930.5A CN107462811A (en) | 2017-08-16 | 2017-08-16 | A kind of method positioned using RS fractal dimensions to the trouble point in low current grounding |
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| Publication Number | Publication Date |
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| CN107462811A true CN107462811A (en) | 2017-12-12 |
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| CN201710702930.5A Pending CN107462811A (en) | 2017-08-16 | 2017-08-16 | A kind of method positioned using RS fractal dimensions to the trouble point in low current grounding |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110927526A (en) * | 2019-12-11 | 2020-03-27 | 云南电网有限责任公司临沧供电局 | Power distribution network fault line selection method based on zero-sequence current waveform fractal box dimension |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1421704A (en) * | 2001-11-28 | 2003-06-04 | 淄博科汇电气有限公司 | Sectional detection method of small current earthing fault of power system |
| CN101726692A (en) * | 2009-12-14 | 2010-06-09 | 辽宁省电力有限公司锦州供电公司 | Single-phase ground fault positioning method for ground protective device of low-current system |
| CN101943737A (en) * | 2010-08-04 | 2011-01-12 | 清华大学 | Single-phase earth fault diagnosis method and device |
| 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 |
| CN103592571A (en) * | 2013-11-08 | 2014-02-19 | 珠海威瀚科技发展有限公司 | Method for achieving single-phase earth fault line selection of small current grounding system |
-
2017
- 2017-08-16 CN CN201710702930.5A patent/CN107462811A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1421704A (en) * | 2001-11-28 | 2003-06-04 | 淄博科汇电气有限公司 | Sectional detection method of small current earthing fault of power system |
| CN101726692A (en) * | 2009-12-14 | 2010-06-09 | 辽宁省电力有限公司锦州供电公司 | Single-phase ground fault positioning method for ground protective device of low-current system |
| CN101943737A (en) * | 2010-08-04 | 2011-01-12 | 清华大学 | Single-phase earth fault diagnosis method and device |
| 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 |
| CN103592571A (en) * | 2013-11-08 | 2014-02-19 | 珠海威瀚科技发展有限公司 | Method for achieving single-phase earth fault line selection of small current grounding system |
Non-Patent Citations (2)
| Title |
|---|
| 姚斌: "RS方法在故障选线和电压暂降检测中的应用", 《中国优秀硕士学位论文全文数据库·工程科技Ⅱ辑》 * |
| 张庆超 等: "弧光故障信号的频谱分布及R/S分析", 《高电压技术》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110927526A (en) * | 2019-12-11 | 2020-03-27 | 云南电网有限责任公司临沧供电局 | Power distribution network fault line selection method based on zero-sequence current waveform fractal box dimension |
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Application publication date: 20171212 |