CN113109668B - Power distribution network asymmetric fault positioning method based on reclosing zero-mode traveling wave mutation - Google Patents
Power distribution network asymmetric fault positioning method based on reclosing zero-mode traveling wave mutation Download PDFInfo
- Publication number
- CN113109668B CN113109668B CN202110398499.6A CN202110398499A CN113109668B CN 113109668 B CN113109668 B CN 113109668B CN 202110398499 A CN202110398499 A CN 202110398499A CN 113109668 B CN113109668 B CN 113109668B
- Authority
- CN
- China
- Prior art keywords
- fault
- zero
- traveling wave
- reclosing
- voltage
- 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
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
- G01R31/086—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
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/16—Measuring asymmetry of polyphase networks
-
- 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
-
- 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
- G01R31/11—Locating faults in cables, transmission lines, or networks using pulse reflection methods
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/70—Smart grids as climate change mitigation technology in the energy generation sector
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/22—Flexible AC transmission systems [FACTS] or power factor or reactive power compensating or correcting units
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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 discloses a method for positioning asymmetric faults of a power distribution network based on sudden change of a reclosing zero-mode traveling wave, which comprises the following steps of firstly, recording reclosing time and corresponding reclosing voltage traveling waves through a traveling wave acquisition device arranged at the head end of a line; secondly, performing phase-mode transformation on the traveling wave of the reclosure voltage, selecting a mother wavelet suitable for transient analysis of the fault of the power system as a wavelet base, performing discrete wavelet transformation on the zero-mode voltage, and identifying the reflected traveling wave of the fault point according to the sudden change moment of the zero-mode voltage; thirdly, according to the reclosing time and the arrival time of the fault point reflected traveling wave, combining the zero mode wave speed to obtain a fault distance; then, a possible fault branch is judged according to the fault distance, zero sequence currents of the synchronous phasor measurement units at two ends of the branch are extracted, the fault branch is determined according to the direction of the zero sequence currents, and fault positioning is achieved. The method can realize the single-end quantity positioning of the asymmetric fault of the power distribution network, has lower required sampling frequency and meets the practical requirement of engineering.
Description
Technical Field
The invention belongs to the field of power systems, relates to the field of fault location of power distribution networks with complex structures, and particularly relates to a power distribution network asymmetric fault location method based on reclosing zero-mode traveling wave mutation.
Background
In China, a low-voltage distribution network is widely operated in a mode of non-effective grounding of a neutral point, and the mode comprises three modes of non-grounding, grounding through an arc suppression coil and grounding through a high resistance. The system has a high probability of generating a ground fault, and a fault point needs to be located as soon as possible. The accurate and rapid power distribution network asymmetric fault positioning method is researched, the acceleration of fault clearing and power supply recovery is facilitated, the power failure loss is reduced, and the method has important significance on the safe and economic operation of the whole power system. However, fault localization in medium and low voltage distribution networks is not well addressed at present. Due to the fact that the distribution line is complex in structure, multiple in branch points and short in line, after a fault, the travelling wave is fiercely refracted and reflected, and wave heads are not easy to identify. The traditional traveling wave method utilizes transient traveling waves generated by fault points during fault to carry out fault location, and comprises a reflected wave method and a modulus wave velocity difference method. However, the traveling wave is attenuated and distorted in the propagation process, and the traveling wave is difficult to identify effectively. The single-ended method is susceptible to the reflection and refraction of traveling waves at the end of a branch point or a line, and is difficult to detect the traveling waves reflected by a fault point. The double-ended method does not have the disadvantages, only requires initial traveling waves at two ends, but requires time synchronization, and installation of positioning devices at all terminals of the power distribution network does not meet economic requirements. For a power distribution network with a complex structure, a single-ended traveling wave method is adopted for fault location in the aspects of economy and practicability. The traveling wave measured by the single-ended measuring point comprises superposition of multiple refraction and reflection waves of a fault point, a branch point, a line tail end and the like, and the traveling wave reflected by the branch point and the line tail end can confuse identification of the traveling wave reflected by the fault point. When a fault occurs on the overhead line, as most transient faults exist, reclosing is required to be input, the influence of the transient faults is favorably reduced, the power failure time is shortened, the power failure loss caused by the transient faults can be reduced to the maximum degree by using the reclosing traveling wave to carry out fault positioning, and accurate fault positioning can be realized for permanent faults.
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to provide a power distribution network asymmetric fault positioning method based on reclosing zero-mode traveling wave mutation, which can realize accurate fault positioning in a power distribution network with a complex structure of a multi-branch short circuit, so as to accelerate fault clearing and power supply recovery, reduce power failure loss and ensure safe and economic operation of a power system.
In order to achieve the purpose, the invention adopts the following technical scheme:
a distribution network asymmetric fault positioning method based on reclosing zero-mode traveling wave mutation can realize asymmetric fault positioning of single-phase grounding, two-phase grounding and two-phase short circuit in a distribution network, and is suitable for various line types of overhead lines, cable lines or overhead cable mixed lines; the method comprises the following specific steps:
step 1: when a circuit fails, transient traveling waves generated on the circuit after the circuit breaker is reclosed are called reclosing traveling waves; recording the reclosing moment and the corresponding reclosing voltage traveling wave through a traveling wave acquisition device arranged at the head end of the line;
and 2, step: carrying out phase-mode conversion decoupling on the reclosure voltage traveling wave, extracting zero-mode voltage and eliminating power frequency quantity; u. u a 、u b 、u c Is a three-phase voltage u 0 For zero-mode voltage after conversion, u 1 、u 2 The converted line mode voltage is obtained; clarke Clarke transformation is adopted, and the transformation formula is shown as follows;
and step 3: selecting a mother wavelet suitable for fault transient analysis of a power system as a wavelet basis processing fault signal; discretizing the continuous wavelet transform to realize the effectiveness of the wavelet transform; discretizing the scale factor and the time translation factor, and performing discrete wavelet transformation on the zero-mode voltage to obtain the zero-mode voltage mutation moment;
and 4, step 4: identifying the fault point reflected voltage traveling wave according to the zero-mode voltage mutation moment, and recording the arrival moment of the fault point reflected voltage traveling wave; will reclose at time t 0 And the arrival time t of the traveling wave of the reflected voltage of the fault point 1 Substituting the zero mode wave velocity v in the current line into a distance measurement formula (2) to obtain a fault distance L;
and 5: judging whether a plurality of fault branches correspond to the fault distance by combining the fault distance with a power distribution network topological structure, and if not, determining a fault point according to the fault distance obtained in the step 4 to realize fault positioning; if yes, extracting zero sequence currents of the synchronous phasor measurement units at the two ends of the possible fault branch, determining that the fault branch with the zero sequence currents at the two ends of the branch in opposite directions is the fault branch by comparing the directions of the zero sequence currents, and determining a fault point according to the fault distance obtained in the step 4 to realize fault positioning.
The invention provides a power distribution network asymmetric fault positioning method based on reclosing zero-mode traveling waves, which can realize traveling wave single-end measurement positioning of power distribution network asymmetric faults. The fault location of the power distribution network with a complex structure is carried out by analyzing the reclosing voltage traveling wave of the circuit breaker under the condition of the fault, accurately identifying the traveling wave reflected by the fault point according to the zero-mode voltage traveling wave mutation and combining the traveling wave propagation characteristic of the power distribution line. And when the fault distance corresponds to a plurality of fault branches, positioning the fault branches according to different directions of zero sequence currents at two ends of the normal line and the fault line, so as to realize fault positioning. The effectiveness of the method in the distribution line is verified through simulation analysis, which shows that the method meets the requirement that the power distribution network uses a single-ended traveling wave method for fault positioning, and has the advantages of high positioning precision of the traveling wave method and small influence by fault distance, grounding resistance and system operation mode. The method has relatively low sampling frequency and meets the economic requirement of practical engineering.
Drawings
FIG. 1 is a flow chart of the method of the present invention.
Fig. 2 is a schematic diagram of a 10kV radial distribution network.
Fig. 3 is a schematic diagram of a line single-phase earth fault.
Figure 4 is a reclosing zero mode voltage traveling wave diagram.
Fig. 5 is a diagram of a reclosing zero-mode voltage traveling wave wavelet transform result.
Fig. 6 is a schematic diagram of a zero sequence network.
Fig. 7 is a zero sequence current pattern on both sides of the branch L2.
Fig. 8 is a zero sequence current pattern on both sides of the branch L3.
Fig. 9 is a zero sequence current pattern on both sides of the branch L4.
Detailed Description
The technical solutions of the present invention will be described in detail with reference to the accompanying drawings and examples, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.
A method for positioning asymmetric faults of a power distribution network based on reclosing zero-mode traveling wave sudden change can realize fault positioning of single-phase grounding, two-phase grounding and two-phase short circuit in the power distribution network and is suitable for various line types of overhead lines, cable lines or overhead cable mixed lines. As shown in fig. 1, the specific steps are as follows:
the invention takes a certain actual 10kV radial distribution network system as an example shown in the attached figure 2, carries out fault location on a distribution network under the condition of single-phase earth fault, and needs to explain that the invention is suitable for various fault types of single-phase earth, two-phase earth and two-phase short circuit:
step 1: when a single-phase earth fault shown in the attached figure 3 occurs on the line at the position L2, the breaker breaks the fault, the relay sends a reclosing command within a certain time, and a reclosing traveling wave can be generated on the line after the breaker is reclosed; recording the reclosing moment and the corresponding reclosing voltage traveling wave through a traveling wave acquisition device arranged at the head end of the line; the sampling rate of the traveling wave acquisition device is 1MHz;
step 2: carrying out phase-mode conversion decoupling on the reclosure voltage traveling wave, extracting zero-mode voltage, and eliminating power frequency quantity as shown in figure 4; u. of a 、u b 、u c Is a three-phase voltage u 0 For zero-mode voltage after conversion, u 1 、u 2 The converted line mode voltage is obtained; clarke Clarke transformation is adopted, and the transformation formula is shown as follows;
and step 3: selecting a mother wavelet suitable for fault transient analysis of a power system as a wavelet basis processing fault signal; the db4 wavelet has strong time-frequency localization capability as a mother wavelet, and can realize time-shift invariance and high time-frequency resolution, so that the db4 wavelet is selected as a traveling wave signal processing wavelet; discretizing the continuous wavelet transform to realize the effectiveness of the wavelet transform; discretizing the scale factor and the time shift factor, and performing discrete wavelet transform on the zero-mode voltage to obtain a zero-mode voltage mutation moment t shown in figure 5 1 ＝10μs；
And 4, step 4: identifying the fault point reflected voltage traveling wave according to the zero-mode voltage mutation moment, and recording the arrival moment t of the fault point reflected voltage traveling wave 1 =10 μ s; reclosing moment is t 0 =0 and t is the arrival time of the traveling wave of the reflected voltage at the fault point 1 =10 μ s; the overhead line model of the power distribution network model used in the embodiment is LGJ-185/10, the outer diameter is 18mm, the direct current resistance is 0.157 omega/km, and the sag is 2.5m; because the line is short, zero mode is almost not attenuated and is close to the light velocity propagation, the zero mode wave velocity v =299.76 m/mus in the current line is substituted into a distance measurement formula (2) to obtain the fault distance L =1498.8m;
and 5: according to the fault distance L =1498.8m combined with a power distribution network topological structure, the fault distance corresponds to a plurality of fault branches, and possible fault points are respectively located in the branches L2, L3 and L4; the zero sequence network is shown in fig. 6, and zero sequence currents of the synchronous phasor measurement units at two ends of L2, L3 and L4 are extracted and are respectively shown in fig. 7, fig. 8 and fig. 9; by comparing the directions of the zero sequence currents at the two ends of the branch, the zero sequence currents at the two ends of the branch L2 can be determined to be opposite in direction, so that the L2 is a fault branch; the fault location result is that the fault point is positioned at L2 and is 1498.8m away from the head end of the line; the actual distance of the fault is 1500m, the absolute error is 1.2m, and the relative error is 0.08 percent.
Besides single-phase earth fault positioning in the example, accurate positioning of two-phase earth and two-phase short circuit can be realized. Analyzing the reclosing voltage traveling wave of the circuit breaker which is combined with the fault condition, accurately identifying the traveling wave reflected by the fault point according to the zero-mode voltage traveling wave mutation, and carrying out fault location on the power distribution network with a complex structure by combining the traveling wave propagation characteristic. And when the fault distance corresponds to a plurality of fault branches, positioning the fault branches according to different directions of zero sequence currents at two ends of the normal line and the fault line, so as to realize fault positioning. The method is not influenced by fault distance, fault type, grounding resistance and initial coinciding angle, has high positioning precision and practicability in the power distribution network with a complex structure, and meets the requirement that the power distribution network uses a single-end method to position faults. The reclosing traveling wave is used for fault positioning, so that power failure loss caused by transient faults can be reduced to the maximum extent, and accurate fault positioning can be realized for permanent faults. The sampling frequency required by the power distribution network asymmetric fault positioning method based on the reclosing zero-mode traveling wave sudden change is relatively low, and the economic requirement of actual engineering is met.
Claims (1)
1. A method for positioning asymmetric faults of a power distribution network based on reclosing zero-mode traveling wave sudden change is characterized by comprising the following steps: the method can realize the asymmetric fault location of single-phase grounding, two-phase grounding and two-phase short circuit in the power distribution network, and is suitable for various line types of overhead lines, cable lines or overhead cable mixed lines; the method comprises the following specific steps:
step 1: when a circuit fails, transient traveling waves generated on the circuit after the circuit breaker is reclosed are called reclosing traveling waves; recording the reclosing moment and the corresponding reclosing voltage traveling wave through a traveling wave acquisition device arranged at the head end of the line;
step 2: carrying out phase-mode conversion decoupling on the reclosure voltage traveling wave, extracting zero-mode voltage and eliminating power frequency quantity; u. of a 、u b 、u c Is a three-phase voltage u 0 For zero-mode voltage after conversion, u 1 、u 2 The converted line mode voltage is obtained; clarke Clarke transformation is adopted, and the transformation formula is shown as follows;
and step 3: selecting a mother wavelet suitable for fault transient analysis of a power system as a wavelet basis processing fault signal; discretizing the continuous wavelet transform to realize the effectiveness of the wavelet transform; discretizing the scale factor and the time translation factor, and performing discrete wavelet transformation on the zero-mode voltage to obtain the zero-mode voltage mutation moment;
and 4, step 4: identifying the fault point reflected voltage traveling wave according to the zero-mode voltage mutation moment, and recording the arrival moment of the fault point reflected voltage traveling wave; will reclose at time t 0 And the arrival time t of the traveling wave of the reflected voltage of the fault point 1 Substituting the zero mode wave velocity v in the current line into a distance measurement formula (2) to obtain a fault distance L;
and 5: judging whether a plurality of fault branches correspond to or not according to the fault distance and the power distribution network topological structure, and if not, determining a fault point according to the fault distance obtained in the step 4 to realize fault positioning; if yes, extracting zero sequence currents of the synchronous phasor measurement units at the two ends of the possible fault branch, comparing the directions of the zero sequence currents, determining that the zero sequence currents at the two ends of the branch are opposite in direction to be the fault branch, determining a fault point according to the fault distance obtained in the step 4, and realizing fault positioning.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110398499.6A CN113109668B (en) | 2021-04-12 | 2021-04-12 | Power distribution network asymmetric fault positioning method based on reclosing zero-mode traveling wave mutation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110398499.6A CN113109668B (en) | 2021-04-12 | 2021-04-12 | Power distribution network asymmetric fault positioning method based on reclosing zero-mode traveling wave mutation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113109668A CN113109668A (en) | 2021-07-13 |
| CN113109668B true CN113109668B (en) | 2022-12-20 |
Family
ID=76716506
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110398499.6A Active CN113109668B (en) | 2021-04-12 | 2021-04-12 | Power distribution network asymmetric fault positioning method based on reclosing zero-mode traveling wave mutation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113109668B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114089104B (en) * | 2021-11-12 | 2022-12-09 | 西安交通大学 | Fault direction judging method and system based on line boundary line side voltage |
Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102590693A (en) * | 2012-02-21 | 2012-07-18 | 昆明理工大学 | Simulation after test approach for alternating current (AC) transmission line fault phase selection based on lumped parameter T model |
| CN104133156A (en) * | 2014-07-16 | 2014-11-05 | 山东大学 | Hybrid line single-ended traveling wave fault distance measuring method based on fault distance interval |
| CN104133158A (en) * | 2014-08-04 | 2014-11-05 | 昆明理工大学 | Distribution network fault line selection method based on zero-mode current multi-order difference transformation |
| CN104459458A (en) * | 2015-01-09 | 2015-03-25 | 昆明理工大学 | Method for recognizing circuit switching on and failures through specific short window integral value of directional traveling waves |
| CN104569744A (en) * | 2014-11-26 | 2015-04-29 | 国家电网公司 | Comprehensive single-end fault positioning method applicable to power distribution network lines |
| CN105445624A (en) * | 2015-11-26 | 2016-03-30 | 重庆大学 | Cable fault positioning method according to combination of wavelet transformation and curve fitting |
| CN106291262A (en) * | 2016-10-26 | 2017-01-04 | 四川大学 | The detection and location method of Distribution Network Frame ceases to be busy singlephase earth fault |
| CN106771877A (en) * | 2017-01-11 | 2017-05-31 | 北京衡天北斗科技有限公司 | The determination method and apparatus of the position of failure point of system with non effectively earth ed neutral |
| CN106841913A (en) * | 2017-01-13 | 2017-06-13 | 清华大学 | Distribution line failure distance-finding method |
| 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 |
| CN109116186A (en) * | 2018-08-10 | 2019-01-01 | 重庆邮电大学 | A kind of one-end fault ranging method based on single-ended traveling wave method and intrinsic frequency method |
| CN109188210A (en) * | 2018-10-23 | 2019-01-11 | 国网江苏省电力有限公司徐州供电分公司 | A kind of urban electric power cable Two-terminal Fault Location method based on VMD-Hilbert transformation |
| CN109387743A (en) * | 2018-11-21 | 2019-02-26 | 国网辽宁省电力有限公司朝阳供电公司 | Switch and thus generate the method for single end distance measurement of traveling wave Injection Signal using neutral point |
| CN112415328A (en) * | 2020-10-26 | 2021-02-26 | 中国南方电网有限责任公司 | Fault positioning method and system based on cubic B-spline wavelet and interpolation algorithm |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10222409B2 (en) * | 2013-03-29 | 2019-03-05 | Beijing Inhand Networks Technology Co., Ltd. | Method and system for detecting and locating single-phase ground fault on low current grounded power-distribution network |
| US10989752B2 (en) * | 2017-09-22 | 2021-04-27 | Schweitzer Engineering Laboratories, Inc. | Distance protection using traveling waves in an electric power delivery system |
| WO2019174045A1 (en) * | 2018-03-16 | 2019-09-19 | Siemens Aktiengesellschaft | Method and device for locating fault point in area network based on traveling wave |
| EP3660523B1 (en) * | 2018-11-27 | 2023-04-19 | Siemens Aktiengesellschaft | Method, device and system for determining the location of a fault on a line of an electrical energy supply network |
-
2021
- 2021-04-12 CN CN202110398499.6A patent/CN113109668B/en active Active
Patent Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102590693A (en) * | 2012-02-21 | 2012-07-18 | 昆明理工大学 | Simulation after test approach for alternating current (AC) transmission line fault phase selection based on lumped parameter T model |
| CN104133156A (en) * | 2014-07-16 | 2014-11-05 | 山东大学 | Hybrid line single-ended traveling wave fault distance measuring method based on fault distance interval |
| CN104133158A (en) * | 2014-08-04 | 2014-11-05 | 昆明理工大学 | Distribution network fault line selection method based on zero-mode current multi-order difference transformation |
| CN104569744A (en) * | 2014-11-26 | 2015-04-29 | 国家电网公司 | Comprehensive single-end fault positioning method applicable to power distribution network lines |
| CN104459458A (en) * | 2015-01-09 | 2015-03-25 | 昆明理工大学 | Method for recognizing circuit switching on and failures through specific short window integral value of directional traveling waves |
| CN105445624A (en) * | 2015-11-26 | 2016-03-30 | 重庆大学 | Cable fault positioning method according to combination of wavelet transformation and curve fitting |
| CN106291262A (en) * | 2016-10-26 | 2017-01-04 | 四川大学 | The detection and location method of Distribution Network Frame ceases to be busy singlephase earth fault |
| CN106771877A (en) * | 2017-01-11 | 2017-05-31 | 北京衡天北斗科技有限公司 | The determination method and apparatus of the position of failure point of system with non effectively earth ed neutral |
| CN106841913A (en) * | 2017-01-13 | 2017-06-13 | 清华大学 | Distribution line failure distance-finding method |
| 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 |
| CN109116186A (en) * | 2018-08-10 | 2019-01-01 | 重庆邮电大学 | A kind of one-end fault ranging method based on single-ended traveling wave method and intrinsic frequency method |
| CN109188210A (en) * | 2018-10-23 | 2019-01-11 | 国网江苏省电力有限公司徐州供电分公司 | A kind of urban electric power cable Two-terminal Fault Location method based on VMD-Hilbert transformation |
| CN109387743A (en) * | 2018-11-21 | 2019-02-26 | 国网辽宁省电力有限公司朝阳供电公司 | Switch and thus generate the method for single end distance measurement of traveling wave Injection Signal using neutral point |
| CN112415328A (en) * | 2020-10-26 | 2021-02-26 | 中国南方电网有限责任公司 | Fault positioning method and system based on cubic B-spline wavelet and interpolation algorithm |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113109668A (en) | 2021-07-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Suonan et al. | A novel fault-location method for HVDC transmission lines | |
| CN107632236B (en) | Single-outlet transmission line single-end fault location method based on opposite-end bus reflected wave identification | |
| CN110658420A (en) | Double-end traveling wave fault location method for hybrid power transmission line based on wavelet transformation and time search strategy | |
| WO2017024618A1 (en) | Hybrid line fault point positioning method based on single-end electrical quantity and comprehensive transient travelling wave characteristic analysis | |
| CN103293449B (en) | Method for removing single-terminal traveling wave fault location dead area of high-voltage power grid in coal mine | |
| CN106841913B (en) | Distribution line fault location method | |
| Krzysztof et al. | Regular paper Traveling Wave Fault Location In Power Transmission Systems: An Overview | |
| CN107621591A (en) | A kind of transmission line of electricity iteration distance-finding method based on zero mould traveling wave speed variation characteristic | |
| CN105353269B (en) | A kind of online fault distance-finding method of high-tension cable | |
| CN109342888B (en) | Single-ended power transmission line fault location method based on reclosing action analysis | |
| CN113109668B (en) | Power distribution network asymmetric fault positioning method based on reclosing zero-mode traveling wave mutation | |
| CN112526282B (en) | Distribution network single-phase earth fault section positioning method | |
| CN109470987A (en) | One kind being based on section matching algorithm T connection electric transmission line Single Terminal Traveling Wave Fault Location method | |
| CN112485590A (en) | Power distribution network single-phase line-breaking fault identification method | |
| CN111766470A (en) | Fault positioning method and system for high-voltage direct-current transmission line and direct-current transmission line | |
| CN109596935A (en) | A kind of transmission line malfunction traveling wave method of combined magnetic field energy decay characteristics | |
| CN112782532A (en) | Power distribution network fault location method based on traveling wave signal generated by circuit breaker closing | |
| CN117368645A (en) | Power distribution network cable fault point distance measuring method, system, computer equipment and medium | |
| CN112526290A (en) | Complex power grid grounding fault positioning method based on wide-area traveling wave side-rear simulation | |
| CN115201635A (en) | Multi-branch distribution network fault location method and device based on traveling waves | |
| CN115561573A (en) | Overhead line-cable hybrid line fault positioning method based on traveling wave image characteristics | |
| CN112505472B (en) | Three-phase hybrid power supply network fault location method based on traveling wave | |
| Yongli et al. | Fault location method based on the periodicity of the transient voltage traveling wave | |
| Tian et al. | Accurate fault location of hybrid lines in distribution networks | |
| Wang et al. | Frequency analysis and research of the traveling wave signal of catenary line |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |