CN103163428B - A kind of method improving Single Terminal Traveling Wave Fault Location reliability - Google Patents
A kind of method improving Single Terminal Traveling Wave Fault Location reliability Download PDFInfo
- Publication number
- CN103163428B CN103163428B CN201310099095.2A CN201310099095A CN103163428B CN 103163428 B CN103163428 B CN 103163428B CN 201310099095 A CN201310099095 A CN 201310099095A CN 103163428 B CN103163428 B CN 103163428B
- Authority
- CN
- China
- Prior art keywords
- fault
- distance
- traveling wave
- wave
- suspected malfunctions
- 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 present invention is a kind of method improving transmission line of electricity Single Terminal Traveling Wave Fault Location reliability, belongs to Relay Protection Technology in Power System field.Wavelet transformation is carried out to the capable ripple of fault current and asks modulus maximum, tentatively determine several possible trouble spot reflection wave wave heads and demarcate it to arrive the moment of measuring, calculate one group of suspected malfunctions distance; Carry out Fourier to the capable ripple of fault current to change and ask its free-running frequency to distribute, determine the free-running frequency of reflect fault location, calculate a fault distance; One by one this fault distance and all suspected malfunctions distances are compared, when the fault distance that a certain suspected malfunctions distance and natural frequency are tried to achieve about waits, determine that this suspected malfunctions distance is the calculated value of fault distance.Actual conditions and a large amount of emulation show, the method effectively can improve the reliability of Single Ended Fault Location.
Description
Technical field
The present invention relates to Relay Protection Technology in Power System field, specifically a kind of free-running frequency range finding combines with Single Terminal Traveling Wave Fault Location and improves the method for Single Terminal Traveling Wave Fault Location reliability.
Background technology
Single Terminal Traveling Wave Fault Location is that the time difference utilizing the initial wavefront in trouble spot and trouble spot reflected traveling wave wave head to arrive measuring junction carries out fault localization.Its range finding formula is:
, in formula
for fault distance,
for row velocity of wave propagation,
with
be respectively the moment of fault initial row ripple and trouble spot reflected traveling wave arrival measuring junction.As can be seen from formula: whether correct identification row ripple arrives the moment of measuring junction from trouble spot, Accurate Calibration trouble spot row ripple and accurately determine that row velocity of wave propagation is the key of the method.But, due to the impact of Noise and Interference, the current traveling wave that measuring junction is obtained has singularity, when adopting wavelet transformation to ask modulus maximum, time shaft there will be a series of wavefront of different nature, bring certain difficulty to the identification coming from trouble spot wavefront, especially easily cause the erroneous judgement to trouble spot reflection wave wave head.
From the process that fault traveling wave produces and propagates, when certain of transmission line of electricity a bit breaks down, the capable ripple of curtage that trouble spot produces is propagated respectively to both sides, trouble spot, when row ripple runs into wave impedance discrete point, row ripple in this some generation catadioptric, and is reflected on measuring junction.Fault traveling wave trouble spot and measuring junction repeatedly catadioptric form the free-running frequency of reflect fault location, fault traveling wave in measuring junction and opposite end repeatedly catadioptric form the free-running frequency of reflection total track length.Under normal circumstances, minimum secondary frequencies amplitude maximum in the free-running frequency distribution that fault traveling wave is formed, other frequency components increase with frequency and reduce.Find out thus, free-running frequency range finding is that the fault traveling wave wave head high fdrequency component that repeatedly catadioptric is formed utilizing measuring junction to obtain carries out fault localization, the method does not rely on accurate detection and the moment demarcation of a or two wavefront, but has substantial connection with the time of fault traveling wave process lasts.Be multi-lead wire construction for bus and fault type is the situation of singlephase earth fault, the computing formula of free-running frequency range finding is
; In formula,
be main free-running frequency and meet
,
for fault traveling wave to be transmitted to the time of measuring junction from trouble spot,
for row velocity of wave propagation.
Summary of the invention
The object of this invention is to provide a kind of method improving transmission line of electricity Single Terminal Traveling Wave Fault Location reliability, by natural frequency, identification is carried out to several suspected malfunctions distances that single-ended traveling wave method is tried to achieve, determine effective calculated value, the impact solving Noise and Interference when utilizing merely single-ended traveling wave method to find range increases the identification difficulty of trouble spot reflection wave wave head, reduces the shortcoming of Range finding reliability, improves the reliability of single-ended traveling wave method fault localization.
The method that the present invention improves transmission line of electricity Single Terminal Traveling Wave Fault Location reliability is: first utilize Single Terminal Traveling Wave Fault Location to obtain several suspected malfunctions distances
,
...
(
), then utilize natural frequency to obtain fault distance
, then will
with
,
...
compare one by one, if
, then
for the calculated value of fault distance.Concrete enforcement according to the following steps:
After A, transmission line of electricity generation singlephase earth fault, measuring junction detects and record trouble current traveling wave, the capable ripple of fault current is carried out to wavelet transformation and asks modulus maximum, the moment of the initial wavefront of fault current and suspected malfunctions point reflection wave-wave head and arrival measuring junction thereof is demarcated;
B, utilize Single Terminal Traveling Wave Fault Location formula
, calculate suspected malfunctions distance, be designated as
,
...
(
); In formula
for fault distance,
for row velocity of wave propagation,
with
be respectively the moment of fault initial row ripple and trouble spot reflected traveling wave arrival measuring junction;
C, FFT conversion (FastFourierTransformation Fast Fourier Transform (FFT)) is carried out to the capable ripple of fault current, obtain the free-running frequency distribution of faulty line, principal ingredient is wherein defined as the main free-running frequency of faults current traveling wave frequecy characteristic
;
D, utilize free-running frequency find range formula
, calculate fault distance
; In formula
be main free-running frequency and meet
,
for fault traveling wave to be transmitted to the time of measuring junction from trouble spot,
for row velocity of wave propagation;
E, general
with
,
...
contrast one by one, when
time, determine
for the calculated value of fault distance.
Principle of the present invention is: in transmission line travelling wave range finding, can adopt Single Terminal Traveling Wave Fault Location or free-running frequency distance-finding method, contrast Single Terminal Traveling Wave Fault Location formula
with free-running frequency range finding formula
find, two apply a formula all needs row velocity of wave propagation
select, choosing from this variable, two apply a formula exists identical error risk.But for Single Terminal Traveling Wave Fault Location, if can on measuring junction time shaft the wave head of accurate recognition fault initial row ripple and trouble spot reflected traveling wave, its corresponding moment arriving measuring junction
with
just be easy to demarcate.And natural frequency range finding formula
in, also need main free-running frequency
carry out accurate Calculation, its degree of accuracy directly has influence on distance accuracy.Therefore, from determining
,
with
two groups of variablees,
,
determination depend on the identification of wave head character, impact be reliability; And
determination depend on computing method, computing method impact be degree of accuracy.Therefore, two kinds of methods combined, selected single-ended traveling wave method is as the main method of range finding, and natural frequency, as the effective tool strengthening single-ended traveling wave method fault localization reliability, is calculated the fault distance of trying to achieve by natural frequency
, with the suspected malfunctions distance of Single Terminal Traveling Wave Fault Location formulae discovery
,
...
contrast one by one, and then determine the calculated value of fault distance, greatly can improve the reliability of fault localization.
The present invention compared with prior art tool has the following advantages:
1, this method in essence or Single Ended Fault Location, and only need installation one group of checkout equipment, construction cost is low.
2, this method is carrying out timing signal to trouble spot reflection wave wave head, and what need demarcation is one group of suspected malfunctions point reflection wave-wave head, lower than the difficulty of Accurate Calibration wave head.
3, this method carries out identification by natural frequency to several suspected malfunctions distances that single-ended traveling wave method is tried to achieve, and utilizes more merely single-ended traveling wave method to carry out fault localization reliability higher.
Accompanying drawing explanation
Fig. 1 is embodiment of the present invention circuit model;
Fig. 2 is the embodiment of the present invention 1 rainbow when being stained with I loop line generation singlephase earth fault, the measured current traveling-wave waveform that measuring junction detects;
Fig. 3 is the current traveling wave waveform of embodiment of the present invention Fig. 1 measured waveform after wavelet noise;
Fig. 4 is the wavelet modulus maxima of the embodiment of the present invention 1 current traveling wave;
Fig. 5 is that the embodiment of the present invention 1 current traveling wave converts the free-running frequency distribution obtained through FFT;
When Fig. 6 is certain transmission line of electricity of the embodiment of the present invention 2 generation C phase lightning fault, the measured current traveling-wave waveform that measuring junction detects;
Fig. 7 is the wavelet modulus maxima of the embodiment of the present invention 2 current traveling wave;
Fig. 8 is that the embodiment of the present invention 2 current traveling wave converts the free-running frequency distribution obtained through FFT.
Embodiment
Below in conjunction with the drawings and specific embodiments, the invention will be further described.
Embodiment 1: rainbow is stained with the structural model of transmission line of electricity is as shown in Figure 1 bus multi-lead wire construction.During 29 days 20 May in 2008 43 points 25 seconds, rainbow is stained with I loop line, apart from Hongqiao transformer station 24.3km, A phase earth fault is occurred, measuring junction detect and the current traveling wave waveform recorded as shown in Figure 2.
It is comparatively large that measured data shown in Fig. 2 is disturbed impact, carries out wavelet noise to it, obtains current traveling wave waveform as shown in Figure 3.
Wavelet transformation is carried out to the current traveling wave after de-noising and asks modulus maximum, as shown in Figure 4.Easily judge wave head 1. as the initial wavefront of fault, 5. wave head is opposite end bus reflection wave wave head, 2., 3. and 4. wave head is suspected malfunctions point reflection wave-wave head, and the moment initial wavefront of fault and suspected malfunctions point reflection wave-wave head being arrived to measuring junction is demarcated, and gets row velocity of wave propagation
for 298000km/s, utilize range finding formula
, trying to achieve suspected malfunctions distance is
=10.71km,
=13.09km,
=23.88km.
FFT conversion is carried out to the current traveling wave after de-noising, tries to achieve the distribution of free-running frequency as shown in Figure 5.Judge that the frequency of 1992Hz is the free-running frequency of reflection total track length, the frequency of 6151Hz is the free-running frequency of reflect fault location.Get row velocity of wave propagation
for 298000km/s, according to range finding formula
, try to achieve fault distance
=24.22km.
Will
=24.22km with
=10.71km,
=13.09km and
=23.88km contrasts respectively, because
=24.22km with
=23.88km is more close, so judge
=23.88km is the calculated value of fault distance.Compared with actual value 24.3km, error is 1.7%.
Embodiment 2: when oscillogram is as shown in Figure 6 21 days 20 June in 2009 16 points, the capable ripple of zero-sequence current that after certain 18.45km place of transmission line of electricity distance top transformer station generation C phase lightning fault, measuring junction detects, this transmission line of electricity is bus multi-lead wire construction form.
Carry out wavelet transformation to the capable ripple of this zero-sequence current and ask modulus maximum, result as shown in Figure 7.Easy judgement wave head
for the initial wavefront of fault, wave head
,
with
for suspected malfunctions point reflection wave-wave head, the moment initial wavefront of fault and suspected malfunctions point reflection wave-wave head being arrived to measuring junction is demarcated, and gets row velocity of wave propagation
for 298000km/s, utilize range finding formula
, trying to achieve suspected malfunctions distance is
=19.37km,
=14.00km,
=18.87km.
FFT conversion is carried out to the capable ripple of zero-sequence current as shown in Figure 6, tries to achieve the distribution of free-running frequency as shown in Figure 8.Judge that the frequency of 8098Hz is the free-running frequency of reflect fault location, velocity of wave propagation
for 298000km/s, according to range finding formula
, try to achieve fault distance
km.
Will
km with
=19.37km,
=14.00km and
=18.87km contrasts respectively, because
km with
=18.87km is more close, so judge
=18.87km is the calculated value of fault distance.Compared with actual value 18.45km, error is 2.3%.
By reference to the accompanying drawings embodiments of the present invention are illustrated above, but the present invention is not limited to above-mentioned embodiment, in the ken that those skilled in the art possess, can also makes a variety of changes under the prerequisite not departing from present inventive concept.
Claims (1)
1. improve a method for transmission line of electricity Single Terminal Traveling Wave Fault Location reliability, it is characterized in that: first utilize Single Terminal Traveling Wave Fault Location to obtain several suspected malfunctions distance x
f1, x
f2x
fn, n=1,2,3 ..., then utilize natural frequency to obtain fault distance x '
f, then by x '
fwith x
f1, x
f2x
fncompare one by one, if x '
f≈ x
fn, then x
fnfor the calculated value of fault distance;
Concrete enforcement according to the following steps:
After A, transmission line of electricity generation singlephase earth fault, measuring junction detects and record trouble current traveling wave, the capable ripple of fault current is carried out to wavelet transformation and asks modulus maximum, and the moment initial wavefront of fault current, suspected malfunctions point reflection wavefront and the initial wavefront of fault current and suspected malfunctions point reflection wavefront being arrived to measuring junction is demarcated;
B, utilize Single Terminal Traveling Wave Fault Location formula x
f=v (t
2-t
1)/2, calculate suspected malfunctions distance, are designated as x
f1, x
f2x
fn, n=1,2,3 X in formula
ffor suspected malfunctions distance, v are row velocity of wave propagation, t
2and t
1be respectively the moment of the initial wavefront of fault current and suspected malfunctions point reflection wavefront arrival measuring junction;
C, FFT conversion is carried out to the capable ripple of fault current, obtain the free-running frequency distribution of faulty line, principal ingredient is wherein defined as the main free-running frequency f of faults current traveling wave frequecy characteristic
0;
D, free-running frequency is utilized to find range formula x'
f=v/2f
0, calculate fault distance x '
f; F in formula
0be main free-running frequency and meet f
0=1/2 τ, τ is the capable ripple of fault current is transmitted to measuring junction time from trouble spot, and v is row velocity of wave propagation;
E, by x '
fwith x
f1, x
f2x
fncompare one by one, work as x '
f≈ x
fntime, determine x
fnfor the calculated value of fault distance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310099095.2A CN103163428B (en) | 2013-03-26 | 2013-03-26 | A kind of method improving Single Terminal Traveling Wave Fault Location reliability |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310099095.2A CN103163428B (en) | 2013-03-26 | 2013-03-26 | A kind of method improving Single Terminal Traveling Wave Fault Location reliability |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103163428A CN103163428A (en) | 2013-06-19 |
| CN103163428B true CN103163428B (en) | 2016-03-30 |
Family
ID=48586680
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310099095.2A Active CN103163428B (en) | 2013-03-26 | 2013-03-26 | A kind of method improving Single Terminal Traveling Wave Fault Location reliability |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103163428B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104730417B (en) * | 2015-03-10 | 2018-05-29 | 国家电网公司 | It is a kind of using negative-sequence current as the transmission line of electricity method of single end distance measurement of amount of polarization |
| CN105301441B (en) * | 2015-10-12 | 2018-05-15 | 深圳供电局有限公司 | Method and system for positioning tower fault in time-frequency domain combination |
| CN105203926B (en) * | 2015-10-16 | 2017-12-05 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | A kind of method for improving super high voltage direct current electricity transmission line fault location accuracy |
| CN105223472B (en) * | 2015-10-16 | 2017-12-05 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | A kind of ultra-high-tension power transmission line Fault Locating Method based on multi-source data set theory |
| CN113219298B (en) * | 2021-03-24 | 2022-10-11 | 昆明理工大学 | Fault current traveling wave numerical simulation method for complex alternating current power grid |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101718833A (en) * | 2009-12-15 | 2010-06-02 | 西南交通大学 | Method of single end distance measurement of power transmission line malfunction based on traveling wave inherent frequency extraction |
| CN101907437A (en) * | 2010-07-23 | 2010-12-08 | 西安科技大学 | Wavelet difference algorithm-based cable fault localization method |
| CN101923139A (en) * | 2010-04-19 | 2010-12-22 | 昆明理工大学 | Intelligent method for single-ended traveling wave fault location of power transmission line |
| CN102096021A (en) * | 2010-12-08 | 2011-06-15 | 西南交通大学 | Traveling wave natural frequency-based power transmission network failure networking positioning and distance measurement method |
| CN102129013A (en) * | 2011-01-21 | 2011-07-20 | 昆明理工大学 | Distribution network fault location method utilizing natural frequency and artificial neural network |
| CN102680860A (en) * | 2012-06-08 | 2012-09-19 | 东华理工大学 | Automatic fault-point locating method for traveling-wave based fault location of high-voltage electric power lines |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2593555B2 (en) * | 1989-06-09 | 1997-03-26 | 古河電気工業株式会社 | Transmission line position detector |
-
2013
- 2013-03-26 CN CN201310099095.2A patent/CN103163428B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101718833A (en) * | 2009-12-15 | 2010-06-02 | 西南交通大学 | Method of single end distance measurement of power transmission line malfunction based on traveling wave inherent frequency extraction |
| CN101923139A (en) * | 2010-04-19 | 2010-12-22 | 昆明理工大学 | Intelligent method for single-ended traveling wave fault location of power transmission line |
| CN101907437A (en) * | 2010-07-23 | 2010-12-08 | 西安科技大学 | Wavelet difference algorithm-based cable fault localization method |
| CN102096021A (en) * | 2010-12-08 | 2011-06-15 | 西南交通大学 | Traveling wave natural frequency-based power transmission network failure networking positioning and distance measurement method |
| CN102129013A (en) * | 2011-01-21 | 2011-07-20 | 昆明理工大学 | Distribution network fault location method utilizing natural frequency and artificial neural network |
| CN102680860A (en) * | 2012-06-08 | 2012-09-19 | 东华理工大学 | Automatic fault-point locating method for traveling-wave based fault location of high-voltage electric power lines |
Non-Patent Citations (4)
| Title |
|---|
| 一种提取行波自然频率的单端故障测距方法;邬林勇等;《中国电机工程学报》;20080405;第28卷(第10期);第69-75页 * |
| 一种考虑时域特征的单端行波固有频率测距方法;林圣等;《电网技术》;20120731;第36卷(第7期);第243-248页 * |
| 基于行波固有频率的串补线路故障测距方法;李小鹏等;《电网技术》;20120630;第36卷(第6期);第71-76页 * |
| 基于行波自然频率的线路单端故障测距;郝艳妮等;《中国智能电网学术研讨会论文集》;20111231;第102-106页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103163428A (en) | 2013-06-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106093702B (en) | A kind of ultra-high-tension power transmission line travelling wave ranging method considering multipoint fault | |
| CN102288869B (en) | Single-end traveling wave fault ranging method for power transmission line | |
| CN103163428B (en) | A kind of method improving Single Terminal Traveling Wave Fault Location reliability | |
| CN106841913B (en) | Distribution line fault location method | |
| CN105353268B (en) | One kind is used for the judgement of transmission line of electricity distribution traveling wave fault and localization method | |
| CN103293449B (en) | Method for removing single-terminal traveling wave fault location dead area of high-voltage power grid in coal mine | |
| CN103941151B (en) | A kind of utilize voltage, the magnitude of current coordinate be independent of both-end synchronize zero, line mould time difference radiation network Fault Locating Method | |
| CN102830328B (en) | Distributed fault location method for T-circuit | |
| CN102096022A (en) | Traveling wave failure distance measurement method for electric power circuit | |
| CN103105563A (en) | Electric power line fault traveling wave network locating method | |
| CN103217626A (en) | Single-ended traveling wave fault location method using positive and negative wave head time sequence intervals | |
| CN102253310A (en) | Method for identifying property of second wave head during fault location of alternating-current power transmission line | |
| CN103913676B (en) | Based on the transmitting line one-end fault localization method of window during variable row ripple identification | |
| CN103149503A (en) | Fault location method for triangular looped network | |
| CN103777115A (en) | Electric transmission line single-terminal positioning method based on fault transient state and steady-state signal wave velocity difference | |
| CN103383428A (en) | Overhead line and cable mixed line double-end traveling wave fault location method | |
| Xinzhou et al. | Optimizing solution of fault location | |
| Gaur et al. | New ground fault location method for three-terminal transmission line using unsynchronized current measurements | |
| CN103412240A (en) | Same-tower double-power transmission circuit single-end traveling wave fault location method | |
| CN101267108A (en) | Protection method for failure row wave network | |
| CN110082646A (en) | T-link fault distance measurement and computer readable storage medium based on distribution curve along power-frequency voltage | |
| CN102183709B (en) | Method of determining fault point of power grid and severity of fault | |
| CN102707202A (en) | Travelling wave fault distance detection method without determining wave speed for power supply circuit | |
| Wei et al. | Traveling-wave-based fault location algorithm for star-connected hybrid multi-terminal HVDC system | |
| CN106841914B (en) | Fault distance measuring device of distribution line |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |