CN104181442A - Power distribution network single-phase earth fault section locating method based on correlation analysis - Google Patents

Power distribution network single-phase earth fault section locating method based on correlation analysis Download PDF

Info

Publication number
CN104181442A
CN104181442A CN201410415298.2A CN201410415298A CN104181442A CN 104181442 A CN104181442 A CN 104181442A CN 201410415298 A CN201410415298 A CN 201410415298A CN 104181442 A CN104181442 A CN 104181442A
Authority
CN
China
Prior art keywords
zero
fault
coefficient
distribution network
location
Prior art date
Application number
CN201410415298.2A
Other languages
Chinese (zh)
Inventor
宋国兵
马志宾
唐吉斯
刘珮瑶
刘术波
刘健
Original Assignee
西安交通大学
国家电网公司
国网陕西省电力公司电力科学研究院
国网山东省电力公司青岛供电公司
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by 西安交通大学, 国家电网公司, 国网陕西省电力公司电力科学研究院, 国网山东省电力公司青岛供电公司 filed Critical 西安交通大学
Priority to CN201410415298.2A priority Critical patent/CN104181442A/en
Publication of CN104181442A publication Critical patent/CN104181442A/en

Links

Classifications

    • YGENERAL 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
    • Y04INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04SSYSTEMS 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
    • Y04S10/00Systems supporting electrical power generation, transmission or distribution
    • Y04S10/50Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
    • Y04S10/52Outage or fault management, e.g. fault detection or location

Abstract

The invention provides a power distribution network single-phase earth fault section locating method based on correlation analysis. The fault line selection problem in the single-phase earth fault process of a power distribution network is not solved well, and fault locating is more difficult to refer to. After a single-phase earth fault happens to a system, the first capacitive frequency band concept is utilized, each line is simplified into a capacitance model in a zero-sequence network under the selected frequency band, earth fault detection devices are arranged on line outlets and branches to measure zero-sequence voltages and zero-sequence currents, association coefficients of zero-sequence voltage differentials and the zero-sequence currents are obtained, whether fault points are in the section or not is judged according to plus and minus of the obtained association coefficients, finally the association coefficients are judged and calculated to be minus, and the section farthest away from a bus is the section where the fault points are located. The method is simple in principle and easy to implement, fault section locating can be carried out fast and reliably, and the method can be used for neutral ungrounding power distribution systems and can be used for power distribution systems with neutral points grounded through arc suppression coils.

Description

One-phase earthing failure in electric distribution network Section Location based on correlation analysis
Technical field
The method that the present invention relates to a kind of electric power system fault section location, is specifically related to a kind of one-phase earthing failure in electric distribution network Section Location based on correlation analysis.
Background technology
Power distribution network is directly connected with user, and its reliability has determined the power supply quality of electric system to a great extent.The power supply reliability that improves power distribution network is to improve the important research content of power system power supply reliability.Traditional distribution network line adopts radiation type electric supply mode more, and take-off point place is without isolating switch and opertaing device, and the required time that restores electricity is long, has affected the reliability of power distribution network power supply.In recent years, along with the development of intelligent grid, " self-healing " will become the basic function of electrical network, and fault section location is as the basis of self-healing, is the important research content of intelligent grid.
China's power distribution network adopts neutral point small current neutral grounding mode mostly, is subject to the impact of the factors such as neutral grounding mode, power distribution network scale, transition resistance, and failure line selection problem is never satisfactorily resolved, and does not more know where to begin in section location.During small current neutral grounding system generation phase-to phase fault, can produce larger short-circuit current, its section location is easy to realize.But while there is singlephase earth fault, short-circuit current is little, and the curent change that flows through fault and non-fault line is only the variation of capacitive earth current.Special in system neutral is through grounding through arc, and while adopting over-compensation mode to work, utilize the variation of power frequency amount to be difficult to distinguish faulty line and non-fault line.Therefore can only adopt transient to carry out route selection for the system through grounding through arc, and during single-phase earthing, the transient state component of earthing capacitance current may be than steady-state value large several times to tens times.
Selection method sensitivity based on transient signal is higher and be not subject to the impact of arc suppression coil, but existing method is left to be desired mostly.Existing, utilize in transient method, first half-wave method is based on singlephase earth fault, to occur in fault phase voltage to approach near this assumed condition maximal value, and when phase voltage zero cross near fault, transient is faint, is difficult to meet the demands.Although, also there are some problems in the extraction fault-signal that wavelet analysis method can be more accurate, as too responsive to micro-variable in the method, poor anti jamming capability; When trouble spot is during through great transition resistance eutral grounding, the method can not be carried out.Traveling wave method due to fault after wavefront be difficult to accurate seizure, and sample frequency requires high factor, is difficult to realize.Based on above all factors, can find out, the route selection problem of small current neutral grounding system is the problem of not resolving always, and section Position Research achievement is not more known where to begin.
Summary of the invention
The object of the present invention is to provide a kind of one-phase earthing failure in electric distribution network Section Location based on correlation analysis.
For achieving the above object, the present invention has adopted following technical scheme:
After system generation singlephase earth fault, under selected frequency band and under the Voltage Reference direction and current reference direction of appointment, residual voltage and zero-sequence current that utilization is measured at route survey point place, ask for the related coefficient of residual voltage derivative and zero-sequence current, from related coefficient be negative track section or from related coefficient first for negative for chosen distance transformer station section farthest in positive track section is as fault section, thereby the section of realizing trouble spot is located.
Described related coefficient is calculated according to following formula:
ρ [ x ( t ) , y ( t ) ] = ∫ t 1 t 2 x ( t ) y ( t ) dt ∫ t 1 t 2 x ( t ) 2 dt ∫ t 1 t 2 x ( t ) 2 dt - - - ( 1 )
Wherein, ρ [x (t), y (t)] is the related coefficient of x (t), y (t), and x (t) is residual voltage derivative, and y (t) is zero-sequence current, t 1and t 2be respectively initial time and stop constantly.
Consider Grounding Mode of Distribution Network, circuit types, line length and certain nargin, in this method, selected frequency band is 150~600Hz.
Described Voltage Reference direction be measurement point with respect to ground, the bus of current reference direction Wei You transformer station is to circuit.
Described fault section location method specifically comprises the following steps:
Step 1: place carries out synchronized sampling to residual voltage and zero-sequence current at route survey point, the residual voltage and the zero-sequence current that then by analog to digital converter, sampling are obtained are converted into digital quantity;
Step 2: the digital quantity obtaining is carried out to bandpass filtering treatment, obtain zero-sequence current component and zero sequence voltage component, the frequency band of bandpass filtering treatment is 150~600Hz, zero sequence voltage component is asked for to derivative and obtain residual voltage derivative, then ask for the related coefficient of residual voltage derivative and zero-sequence current component;
Step 3: from related coefficient be negative track section or from related coefficient first for negative, be in positive track section chosen distance transformer station section farthest as fault section.
Beneficial effect of the present invention is embodied in:
The present invention is after system generation singlephase earth fault, utilize the first thought of holding frequency range, the ground fault detection device of being installed by each line outlet and bifurcation is measured residual voltage, zero-sequence current, ask for the related coefficient of residual voltage derivative and zero-sequence current, according to the related coefficient that obtains positive and negative, come failure judgement point whether in this section, finally judge calculate related coefficient for bear and from bus farthest person be place, trouble spot section, the principle of the invention is simple, be easy to realize, can be quick, carry out reliably fault section location, both can be used for isolated neutral distribution system, also the distribution system that can be used for neutral by arc extinction coil grounding, fault section location method of the present invention has important practical significance for the intellectuality of power distribution network.
Accompanying drawing explanation
Fig. 1 is 10kV power distribution network realistic model; Wherein, G represents the equivalent source of distribution network systems, and L represents arc suppression coil inductance, and K represents switch, S 6~S 13the load that represents respectively feeder terminal, 1~14 is sector number;
The related coefficient (isolated neutral distribution system) of section 1 residual voltage derivative and zero-sequence current when Fig. 2 is section 6 fault;
The related coefficient (isolated neutral distribution system) of section 3 residual voltage derivatives and zero-sequence current when Fig. 3 is section 6 fault;
The related coefficient (isolated neutral distribution system) of section 6 residual voltage derivatives and zero-sequence current when Fig. 4 is section 6 fault;
The related coefficient (isolated neutral distribution system) of section 7 residual voltage derivatives and zero-sequence current when Fig. 5 is section 6 fault;
The related coefficient (distribution system of neutral by arc extinction coil grounding) of section 1 residual voltage derivative and zero-sequence current when Fig. 6 is section 6 fault;
The related coefficient (distribution system of neutral by arc extinction coil grounding) of section 3 residual voltage derivatives and zero-sequence current when Fig. 7 is section 6 fault;
The related coefficient (distribution system of neutral by arc extinction coil grounding) of section 6 residual voltage derivatives and zero-sequence current when Fig. 8 is section 6 fault;
The related coefficient (distribution system of neutral by arc extinction coil grounding) of section 7 residual voltage derivatives and zero-sequence current when Fig. 9 is section 6 fault;
Embodiment
Below in conjunction with accompanying drawing, the present invention is further illustrated.
Principle of the present invention is: the thought (source: Automation of Electric Systems that holds frequency range based on head, 2003,27 (9): 48-53), during distribution generation singlephase earth fault, in selected a certain frequency band range and under given voltage reference direction and current reference direction, (described Voltage Reference direction is that measurement point is with respect to ground, current reference direction is to circuit by bus), the zero sequence model that perfects circuit and rear, trouble spot circuit all can be equivalent to an electric capacity, between its zero-sequence current and the derivative of residual voltage, is now that a scale-up factor is positive direct proportion function; And for faulty line, its zero sequence model consists of the circuit of system dorsal part, under a certain cutoff frequency, also can be equivalent to an electric capacity, but under designated reference direction, between its zero-sequence current and residual voltage derivative for scale-up factor is negative proportion function.Therefore, ask for the residual voltage derivative at route survey point place and the related coefficient of zero-sequence current.According to the related coefficient that obtains positive and negative, judge actual breaking down whether on this measurement point rear circuit, finally judge that the related coefficient Wei Fuqieli transformer station distance calculated section is farthest place, trouble spot section (being fault section), thereby realize the section location of trouble spot.
Specific embodiment of the invention step is:
Step 1: utilize the ground fault detection device of installing at measurement point (each line outlet and bifurcation), at every route survey point place, residual voltage, zero-sequence current are carried out to synchronized sampling with predetermined sampling rate, the residual voltage, the zero-sequence current that then by analog to digital converter, sampling are obtained are converted into digital quantity;
Step 2: the digital quantity obtaining is carried out to bandpass filtering treatment, the frequency band of bandpass filtering treatment is 150Hz~600Hz, obtain zero-sequence current component and zero sequence voltage component that this frequency band is corresponding, zero sequence voltage component is now asked for to its derivative by two point value differential formulas, then utilizes formula (1) to ask for the related coefficient of residual voltage derivative and two time-domain signals of zero-sequence current:
ρ [ x ( t ) , y ( t ) ] = ∫ t 1 t 2 x ( t ) y ( t ) dt ∫ t 1 t 2 x ( t ) 2 dt ∫ t 1 t 2 x ( t ) 2 dt - - - ( 1 )
Wherein, ρ [x (t), y (t)] is the related coefficient of time-domain signal x (t), y (t), and x (t) is residual voltage derivative, and y (t) is zero-sequence current, t 1and t 2be respectively time-domain signal initial time and stop constantly.
Step 3: the related coefficient of the track section calculating by step 2, carry out fault section location.The method of fault section location: be chosen distance transformer station section farthest negative respective segments from related coefficient, be fault section.
L-G simulation test
Referring to Fig. 1, the design parameter of realistic model see " Li Guang. one-phase earthing failure in electric distribution network section Position Research: [D]. Xi'an: Xi'an Communications University, 2012. ".For the sake of simplicity, it is example mutually that the singlephase earth fault arranging all be take A, at section 1~14, for example, under different transition resistance (5~500 ohm), do emulation experiment respectively, the inventive method is failure judgement section reliably all, simulation result while only providing section 6 faults (transition resistance is 150 ohm) below, K opens corresponding isolated neutral distribution system, and K closed pair is answered the distribution system of neutral by arc extinction coil grounding.
Referring to Fig. 2~Fig. 5, result is that the residual voltage derivative of section 1 and section 6 and the related coefficient of zero-sequence current are negative, and the related coefficient of all the other circuits (section 2~section 5, section 7~section 14) is just, and can carry out fault section location thus.The method of fault section location: be that negative section, chosen distance transformer station section is farthest fault section from related coefficient, circuit 6 is fault section.
Referring to Fig. 6~Fig. 9, result be the residual voltage derivative of section 1 and section 6 and the related coefficient of zero-sequence current first for after negative for just, the related coefficient of all the other circuits (section 2~section 5, section 7~section 14) all, always for just, can be carried out fault section location thus.The method of fault section location: be that negative section, chosen distance transformer station section is farthest fault section from related coefficient, circuit 6 is fault section.

Claims (5)

1. the one-phase earthing failure in electric distribution network Section Location based on correlation analysis, is characterized in that: this fault section location method comprises the following steps:
After system generation singlephase earth fault, under selected frequency band and under the Voltage Reference direction and current reference direction of appointment, residual voltage and zero-sequence current that utilization is measured at route survey point place, ask for the related coefficient of residual voltage derivative and zero-sequence current, from related coefficient be negative track section or from related coefficient first for negative, be in positive track section chosen distance transformer station section farthest as fault section.
2. a kind of one-phase earthing failure in electric distribution network Section Location based on correlation analysis according to claim 1, is characterized in that: described related coefficient is calculated according to following formula:
ρ [ x ( t ) , y ( t ) ] = ∫ t 1 t 2 x ( t ) y ( t ) dt ∫ t 1 t 2 x ( t ) 2 dt ∫ t 1 t 2 x ( t ) 2 dt - - - ( 1 )
Wherein, ρ [x (t), y (t)] is the related coefficient of x (t), y (t), and x (t) is residual voltage derivative, and y (t) is zero-sequence current, t 1and t 2be respectively initial time and stop constantly.
3. a kind of one-phase earthing failure in electric distribution network Section Location based on correlation analysis according to claim 1, is characterized in that: selected frequency band is 150~600Hz.
4. a kind of one-phase earthing failure in electric distribution network Section Location based on correlation analysis according to claim 1, is characterized in that: described Voltage Reference direction be measurement point with respect to ground, the bus of current reference direction Wei You transformer station is to circuit.
5. a kind of one-phase earthing failure in electric distribution network Section Location based on correlation analysis according to claim 1, is characterized in that: described fault section location method specifically comprises the following steps:
Step 1: place carries out synchronized sampling to residual voltage and zero-sequence current at route survey point, the residual voltage and the zero-sequence current that then by analog to digital converter, sampling are obtained are converted into digital quantity;
Step 2: the digital quantity obtaining is carried out to bandpass filtering treatment, obtain zero-sequence current component and zero sequence voltage component, the frequency band of bandpass filtering treatment is 150~600Hz, zero sequence voltage component is asked for to derivative and obtain residual voltage derivative, then ask for the related coefficient of residual voltage derivative and zero-sequence current component;
Step 3: from related coefficient be negative track section or from related coefficient first for negative, be in positive track section chosen distance transformer station section farthest as fault section.
CN201410415298.2A 2014-08-21 2014-08-21 Power distribution network single-phase earth fault section locating method based on correlation analysis CN104181442A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201410415298.2A CN104181442A (en) 2014-08-21 2014-08-21 Power distribution network single-phase earth fault section locating method based on correlation analysis

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201410415298.2A CN104181442A (en) 2014-08-21 2014-08-21 Power distribution network single-phase earth fault section locating method based on correlation analysis

Publications (1)

Publication Number Publication Date
CN104181442A true CN104181442A (en) 2014-12-03

Family

ID=51962654

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201410415298.2A CN104181442A (en) 2014-08-21 2014-08-21 Power distribution network single-phase earth fault section locating method based on correlation analysis

Country Status (1)

Country Link
CN (1) CN104181442A (en)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104852364A (en) * 2015-05-07 2015-08-19 许继集团有限公司 Waveform correlation-based distance protection method under distributed parameter model
CN105356428A (en) * 2015-11-23 2016-02-24 国家电网公司 Time domain model identification pilot protection method suitable for wind power system
CN105842583A (en) * 2016-03-25 2016-08-10 西安交通大学 Distribution network single-phase grounding section positioning method based on fault phase voltage and current abrupt change
CN106124936A (en) * 2016-07-29 2016-11-16 国电南瑞科技股份有限公司 A kind of Distributed power net method for locating single-phase ground fault
CN106546873A (en) * 2016-09-28 2017-03-29 深圳市惠立智能电力科技有限公司 A kind of distribution singlephase earth fault Section Location and system
CN107064729A (en) * 2016-12-14 2017-08-18 国家电网公司 Arc suppression coil earthing system single-phase grounding selecting method
CN107153149A (en) * 2017-05-11 2017-09-12 西安交通大学 Power distribution network single-phase disconnection fault recognition method based on negative sequence voltage current characteristic
CN107632237A (en) * 2017-08-16 2018-01-26 杭州零尔电力科技有限公司 A kind of fault line selection method for single-phase-to-ground fault based on wavelet character amount correlation after failure
CN108008247A (en) * 2017-11-24 2018-05-08 国网北京市电力公司 Distribution net work earthing fault localization method and device
CN108051693A (en) * 2017-12-14 2018-05-18 国网陕西省电力公司电力科学研究院 A kind of method of the raising earth fault judgment accuracy based on TAS devices
CN110187220A (en) * 2019-05-23 2019-08-30 昆明理工大学 A kind of MMC direct current transmission line fault recognition methods based on correlation
CN110542823A (en) * 2019-09-11 2019-12-06 山东职业学院 Distribution line single-phase earth fault section positioning method
CN111308278A (en) * 2020-05-11 2020-06-19 国网江西省电力有限公司电力科学研究院 High-resistance fault direction detection method for resonant grounding system

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11352176A (en) * 1998-06-10 1999-12-24 Shikoku Instrumentation Co Ltd Flash accident detecting method power transmission line
CN103207354A (en) * 2013-03-13 2013-07-17 福建省电力有限公司 Maximum line selection coefficient principle based single-phase earth fault line selection method for power distribution network
CN103454555A (en) * 2013-08-02 2013-12-18 西安交通大学 Power distribution network single-phase earth fault section positioning method based on parameter identification
CN103743998A (en) * 2013-12-23 2014-04-23 华北电力大学(保定) Cross correlation coefficient-based distribution network single-phase grounding fault positioning method and system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11352176A (en) * 1998-06-10 1999-12-24 Shikoku Instrumentation Co Ltd Flash accident detecting method power transmission line
CN103207354A (en) * 2013-03-13 2013-07-17 福建省电力有限公司 Maximum line selection coefficient principle based single-phase earth fault line selection method for power distribution network
CN103454555A (en) * 2013-08-02 2013-12-18 西安交通大学 Power distribution network single-phase earth fault section positioning method based on parameter identification
CN103743998A (en) * 2013-12-23 2014-04-23 华北电力大学(保定) Cross correlation coefficient-based distribution network single-phase grounding fault positioning method and system

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
唐捷: "基于小波包多频带相关分析及信息融合的故障选线方法研究", 《中国优秀硕士学位论文全文数据库 工程科技II辑》 *
宋国兵 等: "基于相电流突变量的配电网单相接地故障区段定位", 《电力系统自动化》 *
王玉梅 等: "基于SFB和相关分析法的小电流接地故障选线方法", 《电力自动化设备》 *

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104852364B (en) * 2015-05-07 2018-02-23 许继集团有限公司 Distance protecting method based on Waveform Correlation under distributed parameter model
CN104852364A (en) * 2015-05-07 2015-08-19 许继集团有限公司 Waveform correlation-based distance protection method under distributed parameter model
CN105356428A (en) * 2015-11-23 2016-02-24 国家电网公司 Time domain model identification pilot protection method suitable for wind power system
CN105356428B (en) * 2015-11-23 2018-06-29 国家电网公司 A kind of Model in Time Domain suitable for wind power system identifies longitudinal protection method
CN105842583B (en) * 2016-03-25 2018-09-04 西安交通大学 Distribution single-phase earthing Section Location based on faulted phase voltage and jump-value of current
CN105842583A (en) * 2016-03-25 2016-08-10 西安交通大学 Distribution network single-phase grounding section positioning method based on fault phase voltage and current abrupt change
CN106124936A (en) * 2016-07-29 2016-11-16 国电南瑞科技股份有限公司 A kind of Distributed power net method for locating single-phase ground fault
CN106546873A (en) * 2016-09-28 2017-03-29 深圳市惠立智能电力科技有限公司 A kind of distribution singlephase earth fault Section Location and system
CN107064729A (en) * 2016-12-14 2017-08-18 国家电网公司 Arc suppression coil earthing system single-phase grounding selecting method
CN107064729B (en) * 2016-12-14 2019-09-17 国家电网公司 Arc suppression coil earthing system single-phase grounding selecting method
CN107153149A (en) * 2017-05-11 2017-09-12 西安交通大学 Power distribution network single-phase disconnection fault recognition method based on negative sequence voltage current characteristic
CN107153149B (en) * 2017-05-11 2019-06-11 西安交通大学 Power distribution network single-phase disconnection fault recognition method based on negative sequence voltage current characteristic
CN107632237A (en) * 2017-08-16 2018-01-26 杭州零尔电力科技有限公司 A kind of fault line selection method for single-phase-to-ground fault based on wavelet character amount correlation after failure
CN108008247A (en) * 2017-11-24 2018-05-08 国网北京市电力公司 Distribution net work earthing fault localization method and device
CN108051693A (en) * 2017-12-14 2018-05-18 国网陕西省电力公司电力科学研究院 A kind of method of the raising earth fault judgment accuracy based on TAS devices
CN110187220A (en) * 2019-05-23 2019-08-30 昆明理工大学 A kind of MMC direct current transmission line fault recognition methods based on correlation
CN110542823A (en) * 2019-09-11 2019-12-06 山东职业学院 Distribution line single-phase earth fault section positioning method
CN111308278A (en) * 2020-05-11 2020-06-19 国网江西省电力有限公司电力科学研究院 High-resistance fault direction detection method for resonant grounding system

Similar Documents

Publication Publication Date Title
Lotfifard et al. Voltage sag data utilization for distribution fault location
CN103308823B (en) A kind of power distribution network single-phase disconnection phase to phase fault localization method
Corsi et al. A real-time voltage instability identification algorithm based on local phasor measurements
Sidhu et al. Performance of distance relays on shunt-FACTS compensated transmission lines
Zheng et al. A transient protection scheme for HVDC transmission line
Borghetti et al. Integrated use of time-frequency wavelet decompositions for fault location in distribution networks: Theory and experimental validation
CN103675605B (en) A kind of power distribution network earth fault line selection method based on the correlation analysis of fault-signal transient state
Zhang et al. Multi-terminal HVDC transmission technologies and its application prospects in China [J]
CN101598761B (en) Fault line selection method for small electric current grounding system of distribution network
CN1333503C (en) Protection and fault positioning method for generator stator winding single-phase earthing
Liao et al. Online optimal transmission line parameter estimation for relaying applications
CN104101812B (en) Single-phase grounding fault detection and positioning method and system for low-current grounding power distribution network
CN100386637C (en) Fault line selection method for single-phase-to-ground fault in small ground current distribution network
CN102129009B (en) Method for measuring positive sequence parameters of ultra-high voltage transmission line based on double end measuring information
CN102866326B (en) Based on the distribution network fault line selection of zero sequence current variable quantity waveform correlation coefficient matrix
Dong et al. Implementation and application of practical traveling-wave-based directional protection in UHV transmission lines
CN103226176B (en) A kind of wire selection method for power distribution network single phase earthing failure
CN102768324B (en) Single-phase ground fault section positioning method for low-current grounding system
CN2521811Y (en) Shunt resistance type autoamtic tracking arc suppression compensating & select switch
CN102208801B (en) Operation method for safely applying line protection device to wind power station
CN105842583B (en) Distribution single-phase earthing Section Location based on faulted phase voltage and jump-value of current
CN103018627B (en) Adaptive fault type fault line detection method for non-effectively earthed system
US20150073735A1 (en) Method for adaptive fault location in power system networks
CN103245879B (en) Based on the low current grounding localization method in transient reactive power direction
Al-Mohammed et al. A fully adaptive PMU-based fault location algorithm for series-compensated lines

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
RJ01 Rejection of invention patent application after publication

Application publication date: 20141203