CN109298287A - Fault type identification method for small current grounded distribution network based on fault indicator data - Google Patents
Fault type identification method for small current grounded distribution network based on fault indicator data Download PDFInfo
- Publication number
- CN109298287A CN109298287A CN201811417589.XA CN201811417589A CN109298287A CN 109298287 A CN109298287 A CN 109298287A CN 201811417589 A CN201811417589 A CN 201811417589A CN 109298287 A CN109298287 A CN 109298287A
- Authority
- CN
- China
- Prior art keywords
- fault
- phase
- current
- data
- fault detector
- 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.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 23
- 230000007935 neutral effect Effects 0.000 claims abstract description 15
- 230000005611 electricity Effects 0.000 claims abstract description 6
- 230000005540 biological transmission Effects 0.000 claims abstract description 4
- 229920006395 saturated elastomer Polymers 0.000 claims description 21
- 238000005259 measurement Methods 0.000 claims description 5
- 238000005070 sampling Methods 0.000 claims description 3
- 230000004888 barrier function Effects 0.000 claims 1
- 230000005684 electric field Effects 0.000 description 2
- 239000000284 extract Substances 0.000 description 2
- 238000012706 support-vector machine Methods 0.000 description 2
- 230000003044 adaptive effect Effects 0.000 description 1
- 238000013528 artificial neural network Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000036039 immunity Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000819 phase cycle Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
-
- 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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Locating Faults (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses a kind of small current neutral grounding Distribution Network Failure kind identification method based on fault detector data, fault detector is installed on transmission line of electricity, acquisition unit is provided on fault detector, the three-phase current data that acquisition unit will acquire, which are delivered to, collects unit, collect unit for three-phase current tidal data recovering and form three-phase current data set and be sent to recognition unit, recognition unit is identified using following steps: (1) identifying singlephase earth fault and short trouble；(2) symmetrical short-circuit and Nonsymmetric Short Circuit are identified；(3) line to line fault and two-phase grounding fault are identified.The present invention utilizes A/D saturation characteristics and residual voltage feature of fault detector current data etc., simple and effective, practical, convenient for applying in existing distribution automation system.
Description
Technical field
The present invention relates to a kind of small current neutral grounding Distribution Network Failure kind identification method based on fault detector data, belongs to
Fault Diagnosis of Distribution Network technical field.
Background technique
Recording type fault detector is widely used in recent years, has recorded the fault recorder data of magnanimity, in power distribution automation system
In system, the recorder data uploaded by fault detector judges fault type and is counted, and can effectively record failure hair
Raw situation grasps failure distribution and and guides service work.Since the anti-interference of electric-field sensor is poor, original phase-selecting method holds
Easily judge by accident, how combination failure indicator data feature, develop small current neutral grounding system Distribution Network Failure kind identification method,
The problem of being urgent need to resolve in electric system.
In previous distribution network failure sort research, be all made of current transformer or voltage transformer acquisition electric current or
Voltage signal extracts fault feature vector by different methods, and input classifier obtains fault type.The failure modes of acquisition
The fault component of three-phase current after specifically including that failure with initial signal after 2ms zero-sequence current, residual voltage amount and failure,
Transient current energy, stable state three-phase after faulted phase voltage, the phase information of stable fault currents, failure occur in 1/4 cycle
Amplitude and phase of the order components of electric current etc..Feature extracting method mainly has: wavelet transformation, EMD (empirical mode decomposition), small echo
Packet, approximate entropy etc..The classifier of use mainly includes Adaptive Fuzzy Neural-network, SVM (support vector machines), artificial immunity calculation
Method etc..The recorder data of fault detector is presented new feature, the fault detector current measuring range of part of type compared with
It is small, when short trouble occurs, because short circuit current is more than measuring range, it may appear that A/D saturated phenomenon.Simultaneously as voltage is logical
The mode for crossing measurement electric field obtains, and causes voltage measuring value reliability low compared with current measurement value.
Summary of the invention
The present invention is to solve the above problems, provide a kind of small current neutral grounding Distribution Network Failure class based on fault detector data
Type recognition methods, this method extract the fault detector recorder data feature under different faults, and using the feature of extraction as foundation
Carry out fault type recognition.
To achieve the above object, for small current neutral grounding distribution, meter and short current range fault detector data characteristics, originally
The small current neutral grounding Distribution Network Failure kind identification method based on fault detector data of invention is installed on transmission line of electricity faulty
Indicator, which is characterized in that acquisition unit is provided on fault detector, the three-phase current data conveying that acquisition unit will acquire
To unit is collected, collect unit for three-phase current tidal data recovering and form three-phase current data set and be sent to recognition unit, identifies
Unit is identified using following steps:
(1) singlephase earth fault and short trouble are identified
When singlephase earth fault occurs, faulted phase voltage is reduced, and perfects phase voltage raising, and residual voltage increases, each outlet
Zero-sequence current increases.Failure phase earth current is the sum of each sound circuit capacitance current, is usually no more than 100A, is far from reaching
Fault detector current range maximum value, therefore be not in A/D saturated phenomenon.And short trouble, either three-phase shortcircuit, two
Mutually short circuit or two-phase grounding fault, because short circuit current is larger, therefore the electric current A/D saturation that will appear a phase, two-phase or three-phase is existing
As when, therefore propose the identical criterion of singlephase earth fault and short trouble: when fault detector recording three-phase current data, appointing
When A/D saturated phenomenon occurs in the electric current of one phase, two-phase or three-phase, then determine that the failure is otherwise single-phase earthing for short trouble
Failure.
The A/D saturated phenomenon are as follows: when current sampling data absolute value is range maximum value in continuous 1/20 period,
Then think that A/D saturated phenomenon occurs.
(2) symmetrical short-circuit and Nonsymmetric Short Circuit are identified
There is no negative phase-sequence and zero-sequence components in route when generation three phase short circuit fault, and three-phase current amplitude is identical, three-phase electricity
The phase difference of stream is still 120 °.Three phase short circuit fault is unique symmetrical fault and three-phase is short in studied fault type
Road failure is also type more serious in short trouble, and the amplitude that short circuit current when such failure occurs is larger, therefore by failure
The collected three-phase current of oscillograph acquisition unit should be at overcurrent or AD saturation state and saturation accounting at this time
It is larger.Therefore the identical criterion of symmetrical short-circuit and Nonsymmetric Short Circuit is proposed: the fault detector record to having determined that as short trouble
Wave number evidence determines that the secondary failure is symmetrical short if A/D saturated phenomenon occurs in the three-phase current in fault recorder data
Road is determined as three phase short circuit fault.
(3) line to line fault and two-phase grounding fault are identified
When same outlet two-phase short circuit and ground fault occurs, if grounding point is identical, it is full that A/D occurs in failure biphase current
And phenomenon, compared with line to line fault, residual voltage is significantly raised, it can generally reach 15% phase voltage, if grounding point is different, or
When different outlet two-phases are grounded simultaneously, fault detector current data will appear a phase current A/D saturated phenomenon, therefore propose
Line to line fault and two-phase short circuit and ground fault identical criterion: after having been identified as Nonsymmetric Short Circuit failure, if there is a phase current
When A/D saturated phenomenon or residual voltage reach 15% phase voltage or more, then determine that the secondary failure is two-phase grounding fault,
It otherwise is line to line fault.
The present invention is directed to small current neutral grounding distribution, meter and short current range fault detector data characteristics, proposes a kind of base
In the small current neutral grounding Distribution Network Failure kind identification method of fault detector data.This method is merely with fault detector electric current number
According to A/D saturation characteristics and residual voltage feature etc., it is simple and effective, it is practical, convenient in existing distribution automation system
Using.The present invention provides a kind of feasible method for the identification of distribution line failure type, is conducive to grasp Distribution Network Failure
The regularity of distribution pointedly formulates Control of Hidden and failure prevention measure, promotes distribution network failure management level.
Detailed description of the invention
Fig. 1 is distribution line fault detector configuration schematic diagram；
Fig. 2 is the flow chart of the Distribution Network Failure kind identification method the present invention is based on fault detector data；
The recorder data of one fault detector when Fig. 3 is singlephase earth fault；
The recorder data of one fault detector when Fig. 4 is three phase short circuit fault；
The recorder data of one fault detector when Fig. 5 is two-phase short-circuit fault；
The recorder data of one fault detector when Fig. 6 is two-phase short circuit and ground fault.
Specific embodiment
The present invention is directed to small current neutral grounding distribution, meter and short current range fault detector data characteristics, proposes a kind of base
In the small current neutral grounding Distribution Network Failure kind identification method of fault detector data, ground fault, three-phase shortcircuit, two-phase are analyzed
The fault detector Wave data feature of short circuit and two-phase grounding fault, it is full merely with the A/D of fault detector current data
With feature and residual voltage feature etc., fault type recognition method is proposed, successively identifies single-phase earthing and short circuit, symmetrical short-circuit
With Nonsymmetric Short Circuit, line to line fault and two-phase grounding fault.
Distribution Network Failure kind identification method based on fault detector data of the invention, as shown in Figure 1, on transmission line of electricity
Fault detector is installed, acquisition unit is provided on fault detector, the three-phase current data conveying that acquisition unit will acquire
To unit is collected, collect unit for three-phase current tidal data recovering and form three-phase current data set and be sent to recognition unit, identifies
Unit identified using following steps, specifically include the following three steps:
One, identifies singlephase earth fault and short trouble: as fault detector three-phase recording current data, Ren Yixiang, two
When mutually or the electric current of three-phase A/D saturated phenomenon occurs, then determine that the failure is otherwise singlephase earth fault for short trouble；Institute
State A/D saturated phenomenon are as follows: when current sampling data absolute value is range maximum value in continuous 1/20 period, then it is assumed that occur
A/D saturated phenomenon；By taking Fig. 3 as an example, it is existing that the fault detector current measurement data of same substation's outlet does not occur A/D saturation
As, therefore finally judge the failure for singlephase earth fault.
Two, identify symmetrical short-circuit and Nonsymmetric Short Circuit: to the fault detector recorder data having determined that as short trouble, such as
There is A/D saturated phenomenon in three-phase current in fruit fault recorder data, then determines that the secondary failure is symmetrical short-circuit, that is, be determined as
Three phase short circuit fault；By taking Fig. 4 as an example, there is AD saturated phenomenon in fault detector three-phase current data, therefore final judgement should
Failure is three phase short circuit fault.
Three, identify line to line fault and two-phase grounding fault: after having been identified as Nonsymmetric Short Circuit failure, if there is phase electricity
When stream A/D saturated phenomenon or residual voltage reach 15% phase voltage or more, then determine that the secondary failure is short for two phase ground
Otherwise road is line to line fault；By taking Fig. 5 as an example, there is A/D saturated phenomenon, and residual voltage in fault detector current data two-phase
Less than 15% phase voltage, therefore it is judged as two-phase short-circuit fault；By taking Fig. 6 as an example, there is A/D in fault detector current data two-phase
Saturated phenomenon, and residual voltage is greater than 15% phase voltage, therefore is judged as two-phase short circuit and ground fault.
Although above-mentioned be described and verify to a specific embodiment of the invention and validity in conjunction with attached drawing, not
Limiting the scope of the invention, those skilled in the art should understand that, based on the technical solutions of the present invention, this
Field technical staff does not need to make the creative labor the various modifications or changes that can be made still in protection scope of the present invention
Within.
Claims (4)
1. a kind of small current neutral grounding Distribution Network Failure kind identification method based on fault detector data, it is equipped on transmission line of electricity
Fault detector, characterized in that acquisition unit is provided on fault detector, the three-phase current data that acquisition unit will acquire are defeated
It send to unit is collected, collect unit for three-phase current tidal data recovering and forms three-phase current data set and be sent to recognition unit, know
Other unit is identified using following steps:
(1) singlephase earth fault and short trouble are identified: when fault detector recording three-phase current data, Ren Yixiang, two-phase or
When A/D saturated phenomenon occurs in the electric current of three-phase, then determine that the failure is otherwise singlephase earth fault for short trouble；
(2) symmetrical short-circuit and Nonsymmetric Short Circuit are identified: to the fault detector recorder data having determined that as short trouble, if therefore
There is A/D saturated phenomenon in three-phase current in barrier recorder data, then determines that the secondary failure is symmetrical short-circuit, that is, be determined as three-phase
Short trouble；
(3) line to line fault and two-phase grounding fault are identified: after having been identified as Nonsymmetric Short Circuit failure, if there is a phase current A/
When D saturated phenomenon or residual voltage reach 15% phase voltage or more, then determine that the secondary failure is two-phase grounding fault, it is no
It is then line to line fault；
2. the small current neutral grounding Distribution Network Failure kind identification method based on fault detector data as described in claim 1, special
Sign is A/D saturated phenomenon are as follows: when current sampling data absolute value is range maximum value in continuous 1/20 period, then it is assumed that
A/D saturated phenomenon occurs；
3. the small current neutral grounding Distribution Network Failure kind identification method based on fault detector data as described in claim 1, special
Sign is that fault detector is that the maximum value of current measurement range is greater than load current but is less than the fault detector of short circuit current.
4. the small current neutral grounding Distribution Network Failure kind identification method based on fault detector data as described in claim 1, special
Sign is that the current measurement range of the fault detector is 0-600A.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811417589.XA CN109298287B (en) | 2018-11-26 | 2018-11-26 | Fault type identification method for small current grounded distribution network based on fault indicator data |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811417589.XA CN109298287B (en) | 2018-11-26 | 2018-11-26 | Fault type identification method for small current grounded distribution network based on fault indicator data |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109298287A true CN109298287A (en) | 2019-02-01 |
| CN109298287B CN109298287B (en) | 2021-03-02 |
Family
ID=65143738
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811417589.XA Active CN109298287B (en) | 2018-11-26 | 2018-11-26 | Fault type identification method for small current grounded distribution network based on fault indicator data |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109298287B (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110112712A (en) * | 2019-04-30 | 2019-08-09 | 广东电网有限责任公司 | Power distribution network earth protective device and its sampling control method with the configuration of double mutual inductors |
| CN110231543A (en) * | 2019-06-26 | 2019-09-13 | 国网山东省电力公司临沂供电公司 | Power distribution network abnormality recognition method |
| CN110579690A (en) * | 2019-10-29 | 2019-12-17 | 厦门理工学院 | A method for locating small current ground fault sections in distribution network |
| CN110687400A (en) * | 2019-10-16 | 2020-01-14 | 东方电子股份有限公司 | Method for filtering false start of transient recording type fault indicator |
| CN110879371A (en) * | 2019-11-28 | 2020-03-13 | 赫兹曼电力（广东）有限公司 | Overhead line small current grounding detection box and fault detection method thereof |
| CN111551824A (en) * | 2020-05-15 | 2020-08-18 | 中国南方电网有限责任公司 | Phase voltage amplitude and phase angle change rate ground fault phase selection method and device considering three-phase asymmetry |
| CN111598166A (en) * | 2020-05-18 | 2020-08-28 | 国网山东省电力公司电力科学研究院 | Method and system for single-phase-to-ground fault classification based on principal component analysis and Softmax function |
| CN112782528A (en) * | 2020-12-31 | 2021-05-11 | 西安理工大学 | Power distribution network fault section positioning method using PMU |
| CN112881942A (en) * | 2021-01-14 | 2021-06-01 | 应急管理部四川消防研究所 | Abnormal current diagnosis method and system based on wavelet decomposition and empirical mode decomposition |
| CN113092936A (en) * | 2021-04-02 | 2021-07-09 | 中国矿业大学 | Power distribution network cable fault section identification method based on multi-source data cooperation |
| CN113109733A (en) * | 2021-03-23 | 2021-07-13 | 兰州资源环境职业技术学院 | Overhead cable short circuit grounding fault detection system based on wireless sensor network |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3458123B2 (en) * | 1998-05-01 | 2003-10-20 | 中部電力株式会社 | Ground fault point display |
| CN101738565A (en) * | 2010-01-14 | 2010-06-16 | 北京双杰电气股份有限公司 | Adaptive fault indicator |
| CN203149069U (en) * | 2013-03-20 | 2013-08-21 | 国家电网公司 | Fault classification display fault indicator |
| CN108132425A (en) * | 2017-12-18 | 2018-06-08 | 云南电网有限责任公司电力科学研究院 | Power grid distribution line failure on-line monitoring method and system |
| CN207924054U (en) * | 2018-01-29 | 2018-09-28 | 宁波三星智能电气有限公司 | A kind of fault detector |
| CN108710064A (en) * | 2018-07-27 | 2018-10-26 | 四川瑞霆电力科技有限公司 | A kind of zero sequence active component molded line line fault indicator |
-
2018
- 2018-11-26 CN CN201811417589.XA patent/CN109298287B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3458123B2 (en) * | 1998-05-01 | 2003-10-20 | 中部電力株式会社 | Ground fault point display |
| CN101738565A (en) * | 2010-01-14 | 2010-06-16 | 北京双杰电气股份有限公司 | Adaptive fault indicator |
| CN203149069U (en) * | 2013-03-20 | 2013-08-21 | 国家电网公司 | Fault classification display fault indicator |
| CN108132425A (en) * | 2017-12-18 | 2018-06-08 | 云南电网有限责任公司电力科学研究院 | Power grid distribution line failure on-line monitoring method and system |
| CN207924054U (en) * | 2018-01-29 | 2018-09-28 | 宁波三星智能电气有限公司 | A kind of fault detector |
| CN108710064A (en) * | 2018-07-27 | 2018-10-26 | 四川瑞霆电力科技有限公司 | A kind of zero sequence active component molded line line fault indicator |
Non-Patent Citations (3)
| Title |
|---|
| 张志霞: "《小电流接地系统单相接地故障选线理论研究》", 30 April 2014, 辽宁科学技术出版社 * |
| 杨帆 等: "小电流接地故障多层次分类及其识别模型", 《电力系统自动化》 * |
| 薛永端 等: "小电流接地故障暂态分析及区段定位新方法", 《电力系统自动化》 * |
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110112712A (en) * | 2019-04-30 | 2019-08-09 | 广东电网有限责任公司 | Power distribution network earth protective device and its sampling control method with the configuration of double mutual inductors |
| CN110112712B (en) * | 2019-04-30 | 2021-08-03 | 广东电网有限责任公司 | Power distribution network grounding protection device with double-transformer configuration and sampling control method thereof |
| CN110231543A (en) * | 2019-06-26 | 2019-09-13 | 国网山东省电力公司临沂供电公司 | Power distribution network abnormality recognition method |
| CN110687400B (en) * | 2019-10-16 | 2021-07-20 | 东方电子股份有限公司 | Method for filtering false start of transient recording type fault indicator |
| CN110687400A (en) * | 2019-10-16 | 2020-01-14 | 东方电子股份有限公司 | Method for filtering false start of transient recording type fault indicator |
| CN110579690A (en) * | 2019-10-29 | 2019-12-17 | 厦门理工学院 | A method for locating small current ground fault sections in distribution network |
| CN110579690B (en) * | 2019-10-29 | 2021-11-23 | 厦门理工学院 | Positioning method for small current ground fault section of power distribution network |
| CN110879371A (en) * | 2019-11-28 | 2020-03-13 | 赫兹曼电力（广东）有限公司 | Overhead line small current grounding detection box and fault detection method thereof |
| CN111551824A (en) * | 2020-05-15 | 2020-08-18 | 中国南方电网有限责任公司 | Phase voltage amplitude and phase angle change rate ground fault phase selection method and device considering three-phase asymmetry |
| CN111598166A (en) * | 2020-05-18 | 2020-08-28 | 国网山东省电力公司电力科学研究院 | Method and system for single-phase-to-ground fault classification based on principal component analysis and Softmax function |
| CN111598166B (en) * | 2020-05-18 | 2023-10-17 | 国网山东省电力公司电力科学研究院 | Single-phase ground fault classification method and system based on principal component analysis and softmax function |
| CN112782528A (en) * | 2020-12-31 | 2021-05-11 | 西安理工大学 | Power distribution network fault section positioning method using PMU |
| CN112881942A (en) * | 2021-01-14 | 2021-06-01 | 应急管理部四川消防研究所 | Abnormal current diagnosis method and system based on wavelet decomposition and empirical mode decomposition |
| CN112881942B (en) * | 2021-01-14 | 2023-04-07 | 应急管理部四川消防研究所 | Abnormal current diagnosis method and system based on wavelet decomposition and empirical mode decomposition |
| CN113109733A (en) * | 2021-03-23 | 2021-07-13 | 兰州资源环境职业技术学院 | Overhead cable short circuit grounding fault detection system based on wireless sensor network |
| CN113109733B (en) * | 2021-03-23 | 2023-12-15 | 兰州资源环境职业技术学院 | Overhead cable short-circuit ground fault detection system based on wireless sensor network |
| CN113092936A (en) * | 2021-04-02 | 2021-07-09 | 中国矿业大学 | Power distribution network cable fault section identification method based on multi-source data cooperation |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109298287B (en) | 2021-03-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109298287A (en) | Fault type identification method for small current grounded distribution network based on fault indicator data | |
| CN113036908B (en) | Fault analysis method based on relay protection online monitoring and analysis system | |
| CN107329040B (en) | A kind of power distribution automation main station system single-phase earth fault localization method based on transient state recorder data | |
| Saha et al. | Fault location on power networks | |
| CN101452041B (en) | Electrical power distribution network single-phase earth fault type and phase distinguishing method | |
| AU2011313840B2 (en) | Apparatus and method for fault detection and location determination | |
| Zhang et al. | Non-unit traveling wave protection of HVDC grids using Levenberg–Marquart optimal approximation | |
| CN106093700B (en) | A kind of fault wave recording device and distance measuring method based on voltage traveling wave principle | |
| CN103454555B (en) | Based on the one-phase earthing failure in electric distribution network Section Location of parameter identification | |
| Zou et al. | A traveling-wave-based amplitude integral busbar protection technique | |
| Bo et al. | Positional protection of transmission line using fault generated high frequency transient signals | |
| CN107102236A (en) | A kind of fault line selection method for single-phase-to-ground fault based on waveform correlation analysis after failure | |
| CN112698103B (en) | Method for improving judgment accuracy of high-transition-resistance ground fault | |
| CN106199341A (en) | Faulty line recognition methods under a kind of single-phase fault ground connection operating mode and device | |
| CN102540017A (en) | Partition and segmentation on-line positioning method for small-current grounding faults | |
| CN109490687A (en) | One kind is based on failure phase angle and the polar single-phase earth fault detecting method of transient current | |
| CN105467274A (en) | Device for fault detection and positioning of single-phase grounding of power distribution network | |
| Liu et al. | A pilot protection for LCC-HVDC transmission lines based on measured surge impedance at tuning frequency | |
| CN105606955B (en) | A fault line identification method based on numerical differentiation and empirical mode decomposition | |
| Nasab et al. | A hybrid scheme for fault locating for transmission lines with TCSC | |
| CN100563075C (en) | Same lever/parallel double loop high resistance earthing protecting method and device | |
| Zadeh et al. | Suitability analysis of practical directional algorithms for use in directional comparison bus protection based on IEC61850 process bus | |
| Chen et al. | Location for single‐phase grounding fault in distribution network based on equivalent admittance distortion rate | |
| Banafer et al. | Traveling wave-based primary protection and fault localization scheme for MTDC grid considering IEC 61869-9 measurement standard | |
| Kumar et al. | A literature review on methodologies of fault location in the distribution system with distributed generation |
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 |