CN110879331A - Single-ended traveling wave distance measurement method of local coupling double-circuit power transmission line - Google Patents
Single-ended traveling wave distance measurement method of local coupling double-circuit power transmission line Download PDFInfo
- Publication number
- CN110879331A CN110879331A CN201911210822.1A CN201911210822A CN110879331A CN 110879331 A CN110879331 A CN 110879331A CN 201911210822 A CN201911210822 A CN 201911210822A CN 110879331 A CN110879331 A CN 110879331A
- Authority
- CN
- China
- Prior art keywords
- line
- fault
- traveling wave
- fault occurs
- polarities
- 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.)
- Pending
Links
- 230000005540 biological transmission Effects 0.000 title claims abstract description 28
- 238000000691 measurement method Methods 0.000 title claims abstract description 8
- 230000008878 coupling Effects 0.000 title claims description 10
- 238000010168 coupling process Methods 0.000 title claims description 10
- 238000005859 coupling reaction Methods 0.000 title claims description 10
- 238000005259 measurement Methods 0.000 claims abstract description 23
- 210000004899 c-terminal region Anatomy 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 4
- 230000001052 transient effect Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 8
- 101000744152 Naja oxiana Cytotoxin 2 Proteins 0.000 description 5
- 238000004088 simulation Methods 0.000 description 5
- 238000005070 sampling Methods 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 101100499229 Mus musculus Dhrsx gene Proteins 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Images
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
- G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Mathematical Physics (AREA)
- Theoretical Computer Science (AREA)
- Locating Faults (AREA)
Abstract
The invention relates to a single-ended traveling wave distance measurement method for a locally-coupled double-circuit power transmission line, and belongs to the technical field of power transmission line fault location. Firstly, a high-speed acquisition device at a reading measuring end acquires line mode current traveling waves of two loops of lines, then the acquired line mode current traveling waves are detected and calibrated by adopting a 3-time spline wavelet function, the polarities of the first line mode current traveling waves of the two loops of lines are compared, if the polarities of the first line mode current traveling waves are opposite, a fault occurs in an AD section, and if the polarities are the same, the fault occurs in a BD section or a CD section; when the fault occurs in the AD section, comparing the mode maximum values of the first line mode current traveling waves of the two circuit lines, wherein the circuit line with the larger mode maximum value is the fault circuit line; if the fault occurs in the BD branch, then at t1+2l3The adjacent area of the/v moment is bound with a traveling wave reflecting the full length CD of the line, if the fault occurs in the CD branch, the fault occurs in t1+2l2And finally, calculating the fault distance by using a single-ended traveling wave distance measurement formula.
Description
Technical Field
The invention relates to a single-ended traveling wave distance measurement method for a locally-coupled double-circuit power transmission line, and belongs to the technical field of power transmission line fault location.
Background
With the development of power grid construction, the proportion of 110kV power transmission lines in all the power transmission lines is increased, and partial same-tower double-circuit structures are adopted in the construction, so that the purpose of fully utilizing land resources to increase the transmission capacity of the lines can be achieved. Because 110kV part of double-circuit lines on the same tower are changed into two single-circuit transmission lines at the branch tower, and coupling conditions between the lines exist at the double-circuit lines, certain difficulty is brought to analysis of fault traveling waves and fault positioning, at present, fault branch judgment and fault distance measurement of part of double-circuit transmission lines on the same tower mostly utilize fault information of two-end and three-end measuring ends, but it is difficult to acquire the fault information of two ends and three ends of the transmission lines at the same moment.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a single-ended traveling wave distance measurement method of a local coupling double-circuit power transmission line, which is used for solving the problem.
The technical scheme of the invention is as follows: a single-ended traveling wave distance measurement method of a local coupling double-circuit power transmission line comprises the steps that firstly, a high-speed collection device at a measurement end is read to obtain linear mode current traveling waves of two circuits of lines, then, 3-time spline wavelet functions are adopted to detect and calibrate the obtained linear mode current traveling waves, the polarity of the first linear mode current traveling waves of the two circuits of lines is compared, if the polarities of the linear mode current traveling waves are opposite, a fault occurs in an AD section, and if the polarities are the same, the fault occurs in a BD section or a CD section; when the fault occurs in the AD section, comparing the mode maximum values of the first line mode current traveling waves of the two circuit lines, wherein the circuit line with the larger mode maximum value is the fault circuit line; if the fault occurs in the BD branch, then at t1+2l3The adjacent area of the/v moment is bound with a traveling wave (healthy branch initial traveling wave) reflecting the full length CD of the line, if a fault occurs in the CD branch, the fault occurs in the t branch1+2l2And finally, calculating the fault distance by using a single-ended traveling wave distance measurement formula.
The method comprises the following specific steps:
first, read the broadband transient current data from the CTIAnd CTIIAcquiring fault line mode current traveling wave data of two circuits of lines, and detecting and calibrating the acquired current traveling wave by using a 3-time spline wavelet function;
step two, comparing the polarities of the traveling waves of the first line mode, if the polarities are opposite, the fault occurs in an AD section, and then comparing CTIAnd CTIIWavelet transform of the first individual traveling wave of (1)The maximum value is modulo, the loop line where the measuring end CT corresponding to the maximum value is located is a fault loop line, and the arrival time of the initial traveling wave of the fault point is recorded as t1Recording the time when the calibrated initial traveling wave of the sound loop reaches the measurement end of the sound loop as t2；
And thirdly, comparing the polarities of the traveling waves of the first line mode, and if the polarities are the same, when a fault occurs in the BD branch, at t1+2l3Traveling waves reflecting the full-length CD branch of the line are bound to exist in the neighborhood of the/v moment;
and step four, comparing the polarities of the traveling waves of the first line mode, and if the polarities are the same, when a fault occurs in a CD branch circuit, at t1+2l2Traveling waves reflecting the full-length BD branch of the line are bound to exist in the neighborhood of the/v moment;
and fifthly, calculating the distance from the fault point to the A end by using a single-ended traveling wave distance measurement formula, wherein when the fault occurs in the AD section of the double-circuit transmission line, the distance measurement formula is as follows:
when a fault occurs in the BD segment, the ranging formula is as follows:
when the fault occurs in the CD section, the distance measurement formula is as follows:
in the formula I1、l2、l3The lengths of AD, BD and CD branch power transmission lines are obtained; x is the number offThe distance from the fault point to the A end; x is the number off2The distance from the fault point to the A end; x is the number off3The distance from the fault point to the A end; v is the linear mode wave velocity; t is t1The moment when the initial traveling wave of the fault point reaches the end A; t is t2The moment when the initial traveling wave of the sound loop reaches the A end, tf2The time t of the reflected wave of the B-end bus reaching the A-endf3Is a C-terminal busThe time when the reflected wave reaches the A terminal.
The invention has the beneficial effects that:
(1) the invention relates to a fault point initial traveling wave, a sound return line initial traveling wave and an opposite end bus reflected wave, wherein the traveling wave heads are easy to identify in an intercepted time window, and the maximum value of a wavelet transformation mode is obviously greater than other traveling waves, so that the identification is easier.
(2) The fault traveling wave is observed and identified by combining the fault line measuring end and the non-fault line measuring end, so that the property of the fault traveling wave can be reliably identified, the reliability of single-end distance measurement is improved, and double-end communication is not needed.
Drawings
FIG. 1 is a diagram of a simulation model of a locally coupled dual-loop power transmission line according to the present invention;
FIG. 2 is a line mode current diagram of an AD section I loop in example 1 of the present invention;
FIG. 3 is a schematic current diagram of the AD section II loop mode in example 1 of the present invention;
FIG. 4 is a graph of maximum current mode of the loop line of the AD section I in the embodiment 1 of the present invention;
FIG. 5 is a diagram of maximum values of the current modes of the loop line mode of the AD section II in the embodiment 1 of the present invention;
FIG. 6 is a CTI line mode current diagram of the measuring end of BD segment in embodiment 2 of the present invention;
FIG. 7 is a CTII line-mode current diagram of the measuring end of BD segment in embodiment 2 of the present invention;
FIG. 8 is a plot of the maximum value of the CTI line-mode current in the measuring end of BD segment in embodiment 2 of the present invention;
FIG. 9 is a plot of maximum current mode of CTII line mode at the measuring end of BD segment in embodiment 2 of the present invention;
FIG. 10 is a current diagram of CTI wire mode of CD segment measuring terminal in embodiment 3 of the present invention;
FIG. 11 is a CTII line mode current diagram of CD segment measuring end in embodiment 3 of the present invention;
FIG. 12 is a plot of the current-mode maximum value of the CTI line at the measuring end of the CD segment in embodiment 3 of the present invention;
fig. 13 is a plot of the CTII line-mode current-mode maximum value of the CD segment measuring terminal in embodiment 3 of the present invention.
Detailed Description
The invention is further described with reference to the following drawings and detailed description.
A single-ended traveling wave distance measurement method of a local coupling double-circuit power transmission line comprises the steps that firstly, a high-speed collection device at a measurement end is read to obtain linear mode current traveling waves of two circuits of lines, then, 3-time spline wavelet functions are adopted to detect and calibrate the obtained linear mode current traveling waves, the polarity of the first linear mode current traveling waves of the two circuits of lines is compared, if the polarities of the linear mode current traveling waves are opposite, a fault occurs in an AD section, and if the polarities are the same, the fault occurs in a BD section or a CD section; when the fault occurs in the AD section, comparing the mode maximum values of the first line mode current traveling waves of the two circuit lines, wherein the circuit line with the larger mode maximum value is the fault circuit line; if the fault occurs in the BD branch, then at t1+2l3The adjacent area of the/v moment is bound with a traveling wave (healthy branch initial traveling wave) reflecting the full length CD of the line, if a fault occurs in the CD branch, the fault occurs in the t branch1+2l2And finally, calculating the fault distance by using a single-ended traveling wave distance measurement formula.
The method comprises the following specific steps:
first, read the broadband transient current data from the CTIAnd CTIIAcquiring fault line mode current traveling wave data of two circuits of lines, and detecting and calibrating the acquired current traveling wave by using a 3-time spline wavelet function;
step two, comparing the polarities of the traveling waves of the first line mode, if the polarities are opposite, the fault occurs in an AD section, and then comparing CTIAnd CTIIThe maximum value of the wavelet transform modulus of the first individual traveling wave, the loop line where the measuring end CT corresponding to the larger value is located is the fault loop line, and the arrival time of the initial traveling wave at the fault point is recorded as t1Recording the time when the calibrated initial traveling wave of the sound loop reaches the measurement end of the sound loop as t2；
And thirdly, comparing the polarities of the traveling waves of the first line mode, and if the polarities are the same, when a fault occurs in the BD branch, at t1+2l3Traveling waves reflecting the full-length CD branch of the line are bound to exist in the neighborhood of the/v moment;
the fourth step, comparisonOne line mode traveling wave polarity, if the polarities are the same, the fault occurs in the CD branch circuit at t1+2l2Traveling waves reflecting the full-length BD branch of the line are bound to exist in the neighborhood of the/v moment;
and fifthly, calculating the distance from the fault point to the A end by using a single-ended traveling wave distance measurement formula, wherein when the fault occurs in the AD section of the double-circuit transmission line, the distance measurement formula is as follows:
when a fault occurs in the BD segment, the ranging formula is as follows:
when the fault occurs in the CD section, the distance measurement formula is as follows:
in the formula I1、l2、l3The lengths of AD, BD and CD branch power transmission lines are obtained; x is the number offThe distance from the fault point to the A end; x is the number off2The distance from the fault point to the A end; x is the number off3The distance from the fault point to the A end; v is the linear mode wave velocity; t is t1The moment when the initial traveling wave of the fault point reaches the end A; t is t2The moment when the initial traveling wave of the sound loop reaches the A end, tf2The time t of the reflected wave of the B-end bus reaching the A-endf3The time of the reflected wave of the C-terminal bus reaching the A-terminal is shown.
The principle of the invention is as follows: when a fault occurs in the double-circuit coupling line, ranging is carried out by utilizing the time when the fault initial traveling wave reaches the fault circuit line measuring end and the time when the initial traveling wave of the sound circuit line reaches the sound circuit line measuring end, the polarity of the fault point initial traveling wave is opposite to that of the sound circuit line initial traveling wave, and the sound circuit line initial traveling wave is not influenced by the refraction and reflection of the transition resistance, so that the amplitude of the sound circuit line initial traveling wave of the sound circuit line measuring end is larger than that of the fault circuit line measuring end at the same time. The determination of the initial traveling wave of the health loop can be easier. The current traveling wave adopted is a line mode current traveling wave, so that the coupling between the double-circuit lines can be eliminated. The traveling wave ranging method obtained through PSCAD simulation experiments is reliable and effective.
Example 1: as shown in fig. 1-5, a simulation model of a 110kV ac local coupling double-circuit transmission line is shown in fig. 1; the circuit parameters are as follows: the AD branch line length is 140km, the BD branch line length is 230km, and the CD branch line length is 170km, i.e., (l)1<l3<l2). Fault location: the line distance between the I loop and the A end is 56km, and the fault occurs. The sampling frequency is 1 MHz.
(1) According to the first and second steps in the specification, CT can be obtainedIAnd CTIIThe mode maximum value of the wavelet transformation of the first line mode traveling wave is easily seen from the upper figure, the polarity of the first line mode current traveling waves of the I return line and the II return line is opposite, the fault can be judged to occur in the AD section, and the mode maximum value is compared to find that the mode maximum value of the first line mode of the I return line is larger than the mode maximum value of the first line mode current of the II return line, so that the I return power transmission line of the AD section of the fault line can be judged.
(2) According to the second step in the specification, the time t1 when the initial traveling wave head of the fault point reaches the CTI measuring end is 437 mus, and the time t2 when the initial traveling wave of the sound loop reaches the CTII measuring end is 999 mus.
(3) According to the fifth step of the specification, the distance from the fault point to the A end is 56.262km according to the single-end distance measurement formula of the fault branch.
Example 2: as shown in fig. 1, 6-9, a simulation model of a 110kV alternating current part double-circuit line on the same tower is shown in fig. 1; the circuit parameters are as follows: the AD branch line length is 140km, the BD branch line length is 230km, and the CD branch line length is 170km, i.e., (l)1<l3<l2). Fault location: the BD branch of the I-loop line has a fault at 236km from the A end, namely at 96km from the D end. The sampling frequency is 1 MHz.
(1) According to the first and second steps in the specification, CT can be obtainedIAnd CTIIWavelet transform mode maximum of first line mode traveling waveThe values and the polarities of the first line mode current traveling waves of the I loop and the II loop are the same as each other as can be easily seen from the above figure, the fault can be judged to occur in the BD segment or the CD segment, and then t is observed1+2l3And the traveling wave of the full-length CD branch circuit is reflected in the/v time window, so that the fault line can be judged to be a BD section of power transmission line.
(2) According to the second step in the specification, the CT of the fault point initial traveling wave head reaching the measuring end can be obtainedIAt time t1290 mu s, the reflected wave of the bus at the B end reaches the CT at the measuring endIAt time tf2Was 1186. mu.s.
(3) According to the fifth step of the specification, the distance from the fault point to the A end is 236.496km according to the single-end distance measurement formula of the fault branch.
Example 3: as shown in fig. 1 and 10-13, a simulation model of a 110kV alternating current part double-circuit line on the same tower is shown in fig. 1; the circuit parameters are as follows: the AD branch line length is 140km, the BD branch line length is 230km, and the CD branch line length is 170km, i.e., (l)1<l3<l2). Fault location: a fault occurs at 216km from the A end on the CD branch, namely, a fault occurs at 76km from the D end. The sampling frequency is 1 MHz.
(1) According to the first and second steps in the specification, CT can be obtainedIAnd CTIIThe maximum value of the wavelet transformation mode of the first line mode traveling wave, and it is easy to see from the above figure that the polarity of the first line mode current traveling wave of the I loop and the second loop is the same, and it can be judged that the fault occurs in the BD segment or the CD segment, and then t is observed1+2l2And the traveling wave of the full-length BD branch circuit is reacted in the/v time window, so that the fault line can be judged to be a CD section power transmission line.
(2) According to the second step in the specification, the CT of the fault point initial traveling wave head reaching the measuring end can be obtainedIAt time t1The reflected wave of the C-terminal bus reaches the CT of the measuring terminal at 722 musIAt time tf3It was 1351. mu.s.
(3) According to the fifth step of the specification, the distance from the fault point to the A end is 216.276km according to the single-end distance measurement formula of the fault branch.
While the present invention has been described in detail with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, and various changes can be made without departing from the spirit and scope of the present invention.
Claims (2)
1. A single-ended traveling wave distance measurement method of a local coupling double-circuit power transmission line is characterized by comprising the following steps: firstly, a high-speed acquisition device at a reading measuring end acquires line mode current traveling waves of two loops of lines, then the acquired line mode current traveling waves are detected and calibrated by adopting a 3-time spline wavelet function, the polarities of the first line mode current traveling waves of the two loops of lines are compared, if the polarities of the first line mode current traveling waves are opposite, a fault occurs in an AD section, and if the polarities are the same, the fault occurs in a BD section or a CD section; when the fault occurs in the AD section, comparing the mode maximum values of the first line mode current traveling waves of the two circuit lines, wherein the circuit line with the larger mode maximum value is the fault circuit line; if the fault occurs in the BD branch, then at t1+2l3The adjacent area of the/v moment is bound with a traveling wave reflecting the full length CD of the line, if the fault occurs in the CD branch, the fault occurs in t1+2l2And finally, calculating the fault distance by using a single-ended traveling wave distance measurement formula.
2. The single-ended traveling wave ranging method of the locally-coupled dual-circuit power transmission line according to claim 1, comprising the steps of:
first, read the broadband transient current data from the CTIAnd CTIIAcquiring fault line mode current traveling wave data of two circuits of lines, and detecting and calibrating the acquired current traveling wave by using a 3-time spline wavelet function;
step two, comparing the polarities of the traveling waves of the first line mode, if the polarities are opposite, the fault occurs in an AD section, and then comparing CTIAnd CTIIThe maximum value of the wavelet transform modulus of the first individual traveling wave, the loop line where the measuring end CT corresponding to the larger value is located is the fault loop line, and the arrival time of the initial traveling wave at the fault point is recorded as t1Recording the time when the calibrated initial traveling wave of the sound loop reaches the measurement end of the sound loop as t2；
And thirdly, comparing the polarities of the traveling waves of the first line mode, and if the polarities are the same, when a fault occurs in the BD branch, at t1+2l3Traveling waves reflecting the full-length CD branch of the line are bound to exist in the neighborhood of the/v moment;
and step four, comparing the polarities of the traveling waves of the first line mode, and if the polarities are the same, when a fault occurs in a CD branch circuit, at t1+2l2Traveling waves reflecting the full-length BD branch of the line are bound to exist in the neighborhood of the/v moment;
and fifthly, calculating the distance from the fault point to the A end by using a single-ended traveling wave distance measurement formula, wherein when the fault occurs in the AD section of the double-circuit transmission line, the distance measurement formula is as follows:
when a fault occurs in the BD segment, the ranging formula is as follows:
when the fault occurs in the CD section, the distance measurement formula is as follows:
in the formula I1、l2、l3The lengths of AD, BD and CD branch power transmission lines are obtained; x is the number offThe distance from the fault point to the A end; x is the number off2The distance from the fault point to the A end; x is the number off3The distance from the fault point to the A end; v is the linear mode wave velocity; t is t1The moment when the initial traveling wave of the fault point reaches the end A; t is t2The moment when the initial traveling wave of the sound loop reaches the A end, tf2The time t of the reflected wave of the B-end bus reaching the A-endf3The time of the reflected wave of the C-terminal bus reaching the A-terminal is shown.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911210822.1A CN110879331A (en) | 2019-12-02 | 2019-12-02 | Single-ended traveling wave distance measurement method of local coupling double-circuit power transmission line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911210822.1A CN110879331A (en) | 2019-12-02 | 2019-12-02 | Single-ended traveling wave distance measurement method of local coupling double-circuit power transmission line |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110879331A true CN110879331A (en) | 2020-03-13 |
Family
ID=69730828
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911210822.1A Pending CN110879331A (en) | 2019-12-02 | 2019-12-02 | Single-ended traveling wave distance measurement method of local coupling double-circuit power transmission line |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110879331A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113820563A (en) * | 2021-09-15 | 2021-12-21 | 国网江苏省电力有限公司盐城供电分公司 | Power transmission line fault detection and positioning method based on hybrid conductor |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103412240A (en) * | 2013-07-24 | 2013-11-27 | 昆明理工大学 | Same-tower double-power transmission circuit single-end traveling wave fault location method |
| CN106019079A (en) * | 2016-05-19 | 2016-10-12 | 昆明理工大学 | Novel double end fault location method for double DC circuits on same tower |
| CN107632236A (en) * | 2017-07-26 | 2018-01-26 | 云南电网有限责任公司 | A kind of single outgoing-feeder line one-end fault ranging method based on the identification of opposite end bus back wave |
| CN109406946A (en) * | 2018-11-29 | 2019-03-01 | 昆明理工大学 | A kind of Single Terminal Traveling Wave Fault Location method of common-tower double-return T connection electric transmission line |
| CN109470986A (en) * | 2018-09-26 | 2019-03-15 | 昆明理工大学 | A kind of Single Terminal Traveling Wave Fault Location method of Length discrepancy double-circuit line |
-
2019
- 2019-12-02 CN CN201911210822.1A patent/CN110879331A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103412240A (en) * | 2013-07-24 | 2013-11-27 | 昆明理工大学 | Same-tower double-power transmission circuit single-end traveling wave fault location method |
| CN106019079A (en) * | 2016-05-19 | 2016-10-12 | 昆明理工大学 | Novel double end fault location method for double DC circuits on same tower |
| CN107632236A (en) * | 2017-07-26 | 2018-01-26 | 云南电网有限责任公司 | A kind of single outgoing-feeder line one-end fault ranging method based on the identification of opposite end bus back wave |
| CN109470986A (en) * | 2018-09-26 | 2019-03-15 | 昆明理工大学 | A kind of Single Terminal Traveling Wave Fault Location method of Length discrepancy double-circuit line |
| CN109406946A (en) * | 2018-11-29 | 2019-03-01 | 昆明理工大学 | A kind of Single Terminal Traveling Wave Fault Location method of common-tower double-return T connection electric transmission line |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113820563A (en) * | 2021-09-15 | 2021-12-21 | 国网江苏省电力有限公司盐城供电分公司 | Power transmission line fault detection and positioning method based on hybrid conductor |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| WO2016019666A1 (en) | Method and device for detecting partial discharge of cable | |
| CN106990340B (en) | Partial discharge monitoring system and method | |
| CN106841913B (en) | Distribution line fault location method | |
| CN105699855B (en) | Based on the single-ended traveling wave fault location calculation method not influenced by traveling wave speed and distance measuring method | |
| CN114019309B (en) | Cable defect positioning method based on frequency domain reflection technology | |
| CN103217626B (en) | A kind of single-ended traveling wave fault location method utilizing positive-negative polarity wave head timing intervals | |
| CN103344889B (en) | The method of cable local discharge measured by a kind of electric capacity wire jumper | |
| CN115963358B (en) | Mixed three-terminal flexible direct current transmission line fault location method and system | |
| CN103913676B (en) | Based on the transmitting line one-end fault localization method of window during variable row ripple identification | |
| CN106338237A (en) | Transformer winding deformation detection method based on frequency response impedance method | |
| CN111433616B (en) | Parametric traveling wave based fault location for power transmission lines | |
| CN112363017A (en) | Line fault positioning method based on wavelet transformation | |
| CN110879331A (en) | Single-ended traveling wave distance measurement method of local coupling double-circuit power transmission line | |
| CN115097253A (en) | MMC-HVDC direct current transmission line fault distance measurement method and system | |
| CN116338525A (en) | Wind power alternating current outgoing line fault location method and system | |
| CN111065932A (en) | Traveling wave identification using distortion for power system protection | |
| CN116540016A (en) | Cable defect diagnosis method based on reflection coefficient discrete sequence | |
| CN116629131A (en) | Cable main insulation fault positioning method and system based on neural network algorithm | |
| CN114814493B (en) | Four-segment type cable partial discharge source double-end monitoring and positioning method | |
| CN205844458U (en) | A kind of high pressure equipment measurement of partial discharge air core coil sensor | |
| CN109470986A (en) | A kind of Single Terminal Traveling Wave Fault Location method of Length discrepancy double-circuit line | |
| CN114325212A (en) | Accurate fault positioning algorithm based on flexible monitoring of fault traveling wave | |
| WO2019148794A1 (en) | Method and apparatus for partial discharge detection of high-voltage cable | |
| CN118376896A (en) | Cable partial discharge positioning method and system | |
| CN117388642B (en) | Grounding electrode line fault location method and system based on single-ended frequency difference |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200313 |