CN109188195A - A kind of distribution small current grounding fault localization method and system - Google Patents

A kind of distribution small current grounding fault localization method and system Download PDF

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Publication number
CN109188195A
CN109188195A CN201810938248.0A CN201810938248A CN109188195A CN 109188195 A CN109188195 A CN 109188195A CN 201810938248 A CN201810938248 A CN 201810938248A CN 109188195 A CN109188195 A CN 109188195A
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China
Prior art keywords
fault
power distribution
main station
fault detector
distribution
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Pending
Application number
CN201810938248.0A
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Chinese (zh)
Inventor
吴楠
孙健
刘刚
朱卫平
王秀茹
杨雄
方鑫
袁晓冬
袁宇波
曾飞
祁承磊
陈兵
陈锦铭
崔晋利
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Suqian Power Supply Branch Jiangsu Electric Power Co Ltd
State Grid Corp of China SGCC
State Grid Jiangsu Electric Power Co Ltd
Electric Power Research Institute of State Grid Jiangsu Electric Power Co Ltd
Original Assignee
Suqian Power Supply Branch Jiangsu Electric Power Co Ltd
State Grid Corp of China SGCC
State Grid Jiangsu Electric Power Co Ltd
Electric Power Research Institute of State Grid Jiangsu Electric Power Co Ltd
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Filing date
Publication date
Application filed by Suqian Power Supply Branch Jiangsu Electric Power Co Ltd, State Grid Corp of China SGCC, State Grid Jiangsu Electric Power Co Ltd, Electric Power Research Institute of State Grid Jiangsu Electric Power Co Ltd filed Critical Suqian Power Supply Branch Jiangsu Electric Power Co Ltd
Priority to CN201810938248.0A priority Critical patent/CN109188195A/en
Publication of CN109188195A publication Critical patent/CN109188195A/en
Pending legal-status Critical Current

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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/08Locating faults in cables, transmission lines, or networks
    • G01R31/081Locating faults in cables, transmission lines, or networks according to type of conductors
    • G01R31/086Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
    • 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 present invention discloses a kind of distribution small current grounding fault localization method based on multi-source information and transient state recording, and power distribution automation main station obtains busbar grounding and alerts moment t;When distribution line current break is greater than threshold value I or the mutation of distribution line phase electric field strength is greater than threshold value E, the transient state recording type fault detector starting recording being installed on distribution line, and form recorded wave file;Power distribution automation main station calls all recorded wave files of distribution line under substation in several minutes sections in moment t front and back together on fault detector;Power distribution automation main station establishes the incidence relation of fault detector installation site and recorded wave file on line topological;Power distribution automation main station extracts the residual voltage phase of each recorded wave file, zero-sequence current phase;The relative position of earth fault and fault detector is judged according to the relative direction of residual voltage, zero-sequence current, it is final to determine ground fault section.Energy high frequency zone effective information of the present invention, quick and precisely positions small current grounding fault.

Description

A kind of distribution small current grounding fault localization method and system
Technical field
The invention belongs to the electric network fault analysis technical fields of electric system, and in particular to one kind is based on multi-source information and temporarily The distribution small current grounding fault localization method and system of state recording.
Background technique
Power distribution network is as the power network for being directly facing user, and in large scale, equipment is various, and environment of powering is complicated, becomes The multiple severely afflicated area of failure, according to statistics, 80% or more power outage is caused by distribution network failure, and 70% is in distribution network failure Singlephase earth fault.In power distribution network, isolated neutral or through grounding through arc be small current neutral grounding mode.The small electricity of power distribution network The problem of singlephase earth fault positioning for flowing earthed system is always urgent need to resolve.To solve the above-mentioned problems, power distribution network is promoted Power supply reliability, Distribution Automation Technology comes into being.In existing Distribution Automation Technology, determining for singlephase earth fault is solved Position method is: installing transient state recording type fault detector additional on the line, the electric current that monitors when fault detector, field strength reach touching When sending out the condition of fault detector recording, fault detector carries out recording, and power distribution automation main station will be given in recorded wave file, Earth design analysis is carried out by main website.Since the events such as big load switching also will start fault detector recording, thus it is above-mentioned Method the case where there are ungrounded fault waveform Shang Song main websites, main website redundancy is more, and analysis pressure is larger, and it is fixed to influence main website The efficiency and accuracy of position ground fault.With the continuous promotion of the power distribution network level of IT application, by substation, power distribution automation The multi-source informations such as main website, fault detector, high frequency zone effective information, quick and precisely position small current grounding fault, to promotion Distribution network reliability is of great significance.
Summary of the invention
To solve deficiency in the prior art, the present invention provides a kind of small electricity of the distribution based on multi-source information and transient state recording Earth design method and system is flowed, solves fault detector upload information redundancy, small current neutral grounding event in the prior art The problem of hindering location difficulty.
In order to achieve the above objectives, the present invention adopts the following technical scheme: it is a kind of based on multi-source information and transient state recording Distribution small current grounding fault localization method, it is characterised in that: the following steps are included:
Step 1: when singlephase earth fault occurs for distribution line, power distribution automation main station obtains substation bus bar ground connection and accuses Alert moment t;
Step 2: power distribution automation main station is set in duration under substation before and after calling alarm moment t together on fault detector All recorded wave files of distribution line, the recorded wave file are when distribution line current break is greater than threshold value I or distribution line phase When electric field strength mutation is greater than threshold value E, recording is carried out by the transient state recording type fault detector being installed on distribution line and is formed Recorded wave file;
Step 3: power distribution automation main station establishes the pass of fault detector installation site and recorded wave file on line topological Connection relationship;
Step 4: power distribution automation main station extracts the residual voltage phase of each recorded wave file, zero-sequence current phase;
Step 5: according to the incidence relation of fault detector installation site and recorded wave file, each recorded wave file pair is obtained The fault detector installation site answered, power distribution automation main station judge whether the zero-sequence current phase of each recorded wave file lags zero Sequence voltage phase, if so, fault point is located at the downstream of fault detector installation site, if it is not, then fault point refers to positioned at failure The upstream for showing device installation site determines power distribution network small current grounding fault by the positional relationship of fault point and each fault detector Section.
A kind of distribution small current grounding fault localization method based on multi-source information and transient state recording above-mentioned, feature exist In: the step 1 when singlephase earth fault occurs for distribution line, generates power transformation for monitoring the device of zero sequence amount in substation It stands busbar grounding warning information, and is uploaded to smart grid Dispatching Control System, power distribution automation main station is dispatched from smart grid Busbar grounding is read in the ground connection warning information of control system alerts moment t.
A kind of distribution small current grounding fault localization method based on multi-source information and transient state recording above-mentioned, feature exist In: the transient state recording type fault detector can be measured that distribution line electric current and field strength, when fault detector monitors to match When electric line current break is greater than threshold value I or the mutation of distribution line phase electric field strength greater than threshold value E, fault detector starting record Wave, and form recorded wave file.
A kind of distribution small current grounding fault localization method based on multi-source information and transient state recording above-mentioned, feature exist In: when event occurs for distribution line, if meeting, distribution line current break is greater than threshold value I or the mutation of route phase electric field strength is greater than Threshold value E, then fault detector then will start recording.
A kind of distribution small current grounding fault localization method based on multi-source information and transient state recording above-mentioned, feature exist In: the event includes following one kind: big load switching, short trouble, ground fault.
A kind of distribution small current grounding fault positioning system based on multi-source information and transient state recording, which is characterized in that packet Include power distribution automation main station, substation, the transient state recording type fault detector being installed on distribution line;
When singlephase earth fault occurs for distribution line, when the power distribution automation main station obtains substation bus bar ground connection alarm Carve t;
Power distribution automation main station calls before and after alarm moment t in setting duration section distribution under substation together on fault detector All recorded wave files of route, the recorded wave file are when distribution line current break is greater than threshold value I or distribution line phase electric field When Intensity Abrupt is greater than threshold value E, the record of recording formation is carried out by the transient state recording type fault detector being installed on distribution line Wave file;
Power distribution automation main station establishes the incidence relation of fault detector installation site and recorded wave file on line topological;
Power distribution automation main station extracts the residual voltage phase of each recorded wave file, zero-sequence current phase;
According to the incidence relation of fault detector installation site and recorded wave file, the corresponding failure of each recorded wave file is obtained Indicator installation site, power distribution automation main station judge whether the zero-sequence current phase of each recorded wave file lags residual voltage phase Position, if so, fault point is located at the downstream of fault detector installation site, if it is not, then fault point is located at fault detector installation The upstream of position determines power distribution network section with low-current ground faults by the positional relationship of fault point and each fault detector.
A kind of distribution small current grounding fault positioning system based on multi-source information and transient state recording above-mentioned, feature exist In when singlephase earth fault occurs for distribution line, for monitoring the device generation substation bus bar ground connection of zero sequence amount in substation Warning information, and it is uploaded to smart grid Dispatching Control System;Power distribution automation main station is from smart grid Dispatching Control System It is grounded in warning information and reads busbar grounding alarm moment t.
The invention has the benefit that the present invention is based on smart grid Dispatching Control Systems, power distribution automation main station system The multi-source informations such as system, transient state recording type fault detector, energy high frequency zone effective information quick and precisely position small current neutral grounding event Barrier, provides decision support for distribution scheduling, inspection and repairing.
Detailed description of the invention
Fig. 1 is the flow chart of the method for the present invention.
Specific embodiment
The invention will be further described below in conjunction with the accompanying drawings.Following embodiment is only used for clearly illustrating the present invention Technical solution, and not intended to limit the protection scope of the present invention.
As shown in Figure 1, a kind of distribution small current grounding fault localization method based on multi-source information and transient state recording, including Following steps:
Step 1: when singlephase earth fault occurs for distribution line, become in substation for monitoring the device of zero sequence amount and generating Power station busbar grounding warning information, and it is uploaded to smart grid Dispatching Control System;Smart grid Dispatching Control System is from ground connection Busbar grounding is read in warning information and alerts moment t, and is transferred to power distribution automation main station;
Step 2: according to fault indicator principle, when distribution line current break is greater than threshold value I or distribution line phase When electric field strength mutation is greater than threshold value E, the transient state recording type fault detector starting recording being installed on distribution line, and formed Recorded wave file;
When event, such as big load switching, short trouble, ground fault occurs for route, if meeting transient state recording type failure The mutation of indicator recording entry condition, i.e. line current is greater than threshold value I or the mutation of route phase electric field strength is greater than threshold value E, then event Barrier indicator will start recording, and unrelated with fault detector installation site, and transient state recording type fault detector can measure Line current and field strength;
Step 3: power distribution automation main station calls section [t-5, t+5] power transformation in 5 minutes before and after moment t together on fault detector It stands down all recorded wave files of distribution line;
Substation bus bar is grounded alarm to smart grid Dispatching Control System and busbar grounding alarm moment t sends to and matches Electric automation main website, by all recorded wave files for calling route under 5 minutes section [t-5, the t+5] substations in the front and back t in main website together;Recording File is become calling fault detector recorded wave file in main website selectivity together from traditional send from fault detector active to main website.It will It is non-to greatly reduce fault detector as the trigger condition for calling fault detector waveform in main website together for substation bus bar ground connection alarm It is sent on fault waveform, analysis of the main website to redundancies recorded wave files such as big load switching, short troubles can be effectively reduced, improved Power distribution network small current grounding fault processing speed;
Step 4: power distribution automation main station establishes the pass of fault detector installation site and recorded wave file on line topological Connection relationship;
Step 5: power distribution automation main station extracts the residual voltage phase of each recorded wave file, zero-sequence current phase;
Step 6: power distribution automation main station judges whether zero-sequence current lags residual voltage, if so, fault point is located at event The downstream for hindering indicator installation site, if it is not, then fault point is located at the upstream of fault detector installation site;By fault point and respectively The positional relationship of a fault detector determines ground fault section.It is connect according to the judgement of the relative direction of residual voltage, zero-sequence current The relative position of earth fault point and fault detector, it is final to determine ground fault section, the small electricity suitable for isolated neutral Flow earthed system.
The present invention is based on smart grid Dispatching Control System, power distribution automation main station system, transient state recording type indicating fault The multi-source informations such as device, high frequency zone effective information, quick and precisely position small current grounding fault, for distribution scheduling, inspection and rob Offer decision support is provided.
It should be understood by those skilled in the art that, embodiments herein can provide as method, system or computer program Product.Therefore, complete hardware embodiment, complete software embodiment or reality combining software and hardware aspects can be used in the application Apply the form of example.Moreover, it wherein includes the computer of computer usable program code that the application, which can be used in one or more, The computer program implemented in usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.) produces The form of product.The application is referring to method, the process of equipment (system) and computer program product according to the embodiment of the present application Figure and/or block diagram describe.It should be understood that every one stream in flowchart and/or the block diagram can be realized by computer program instructions The combination of process and/or box in journey and/or box and flowchart and/or the block diagram.It can provide these computer programs Instruct the processor of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce A raw machine, so that being generated by the instruction that computer or the processor of other programmable data processing devices execute for real The device for the function of being specified in present one or more flows of the flowchart and/or one or more blocks of the block diagram.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates, Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one The step of function of being specified in a box or multiple boxes.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art For member, without departing from the technical principles of the invention, several improvement and deformations can also be made, these improvement and deformations Also it should be regarded as protection scope of the present invention.

Claims (7)

1. a kind of distribution small current grounding fault localization method based on multi-source information and transient state recording, it is characterised in that: including Following steps:
Step 1: when singlephase earth fault occurs for distribution line, when power distribution automation main station obtains substation bus bar ground connection alarm Carve t;
Step 2: power distribution automation main station calls before and after alarm moment t in setting duration distribution under substation together on fault detector All recorded wave files of route, the recorded wave file are when distribution line current break is greater than threshold value I or distribution line phase electric field When Intensity Abrupt is greater than threshold value E, the record of recording formation is carried out by the transient state recording type fault detector being installed on distribution line Wave file;
Step 3: what power distribution automation main station established fault detector installation site and recorded wave file on line topological is associated with pass System;
Step 4: power distribution automation main station extracts the residual voltage phase of each recorded wave file, zero-sequence current phase;
Step 5: according to the incidence relation of fault detector installation site and recorded wave file, it is corresponding to obtain each recorded wave file Fault detector installation site, power distribution automation main station judge whether the zero-sequence current phase of each recorded wave file lags zero sequence electricity Phase is pressed, if so, fault point is located at the downstream of fault detector installation site, if it is not, then fault point is located at fault detector The upstream of installation site determines power distribution network small current grounding fault area by the positional relationship of fault point and each fault detector Section.
2. a kind of distribution small current grounding fault positioning side based on multi-source information and transient state recording according to claim 1 Method, it is characterised in that: the step 1, when singlephase earth fault occurs for distribution line, for monitoring zero sequence amount in substation Device generates substation bus bar and is grounded warning information, and is uploaded to smart grid Dispatching Control System, power distribution automation main station from Busbar grounding is read in the ground connection warning information of smart grid Dispatching Control System alerts moment t.
3. a kind of distribution small current grounding fault positioning side based on multi-source information and transient state recording according to claim 1 Method, it is characterised in that: the transient state recording type fault detector can be measured that distribution line electric current and field strength, work as indicating fault When device monitors that distribution line current break is greater than threshold value I or the mutation of distribution line phase electric field strength greater than threshold value E, indicating fault Device starts recording, and forms recorded wave file.
4. a kind of distribution small current grounding fault positioning side based on multi-source information and transient state recording according to claim 1 Method, it is characterised in that: when event occurs for distribution line, if meeting distribution line current break greater than threshold value I or route phase electric field Intensity Abrupt is greater than threshold value E, then fault detector then will start recording.
5. a kind of distribution small current grounding fault positioning side based on multi-source information and transient state recording according to claim 4 Method, it is characterised in that: the event includes following one kind: big load switching, short trouble, ground fault.
6. a kind of distribution small current grounding fault positioning system based on multi-source information and transient state recording, which is characterized in that including Power distribution automation main station, substation, the transient state recording type fault detector being installed on distribution line;
When singlephase earth fault occurs for distribution line, the power distribution automation main station obtains substation bus bar ground connection alarm moment t;
Power distribution automation main station calls before and after alarm moment t in setting duration section distribution line under substation together on fault detector All recorded wave files, the recorded wave file be when distribution line current break be greater than threshold value I or distribution line phase electric field strength When mutation is greater than threshold value E, the recording text of recording formation is carried out by the transient state recording type fault detector being installed on distribution line Part;
Power distribution automation main station establishes the incidence relation of fault detector installation site and recorded wave file on line topological;
Power distribution automation main station extracts the residual voltage phase of each recorded wave file, zero-sequence current phase;
According to the incidence relation of fault detector installation site and recorded wave file, the corresponding indicating fault of each recorded wave file is obtained Device installation site, power distribution automation main station judge whether the zero-sequence current phase of each recorded wave file lags residual voltage phase, If so, fault point is located at the downstream of fault detector installation site, if it is not, then fault point is located at fault detector installation site Upstream, power distribution network section with low-current ground faults is determined by the positional relationship of fault point and each fault detector.
7. a kind of positioned based on multi-source information and the distribution small current grounding fault of transient state recording according to claim 6 is System, which is characterized in that when singlephase earth fault occurs for distribution line, generate power transformation for monitoring the device of zero sequence amount in substation It stands busbar grounding warning information, and is uploaded to smart grid Dispatching Control System;Power distribution automation main station is dispatched from smart grid Busbar grounding is read in the ground connection warning information of control system alerts moment t.
CN201810938248.0A 2018-08-17 2018-08-17 A kind of distribution small current grounding fault localization method and system Pending CN109188195A (en)

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CN110208656A (en) * 2019-07-03 2019-09-06 国网北京市电力公司 A kind of Distribution Network Failure automatic station-keeping system
CN110297161A (en) * 2019-06-21 2019-10-01 国网河北省电力有限公司 Take precautions against the method and scheduling system of with ground power transmission of grid equipment
CN110426596A (en) * 2019-09-11 2019-11-08 山东职业学院 A kind of Distributed power line single phase grounding failure Section Location
CN110426606A (en) * 2019-09-11 2019-11-08 国网重庆市电力公司电力科学研究院 Based on wide area synchronous distribution net work earthing fault localization method and device
CN110542823A (en) * 2019-09-11 2019-12-06 山东职业学院 Distribution line single-phase earth fault section positioning method
CN110632462A (en) * 2019-10-29 2019-12-31 深圳供电局有限公司 Small current grounding fault positioning method and system, computer equipment and medium
CN110907750A (en) * 2019-11-21 2020-03-24 国电南瑞南京控制系统有限公司 Power distribution main station single-phase earth fault positioning method and system based on medium resistance method
CN110907752A (en) * 2019-11-29 2020-03-24 科大智能电气技术有限公司 Method for acquiring transient initial point of zero-sequence current in single-phase earth fault of power distribution network
CN111289838A (en) * 2020-02-13 2020-06-16 国电南瑞科技股份有限公司 Single-phase earth fault positioning method and system based on distribution network PMU
CN113311288A (en) * 2021-05-11 2021-08-27 国网浙江省电力有限公司湖州供电公司 Small current grounding fault searching and positioning method and system

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CN110297161A (en) * 2019-06-21 2019-10-01 国网河北省电力有限公司 Take precautions against the method and scheduling system of with ground power transmission of grid equipment
CN110297161B (en) * 2019-06-21 2021-10-15 国网河北省电力有限公司 Method for preventing power grid equipment from transmitting power with connection point and scheduling system
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CN110632462A (en) * 2019-10-29 2019-12-31 深圳供电局有限公司 Small current grounding fault positioning method and system, computer equipment and medium
CN110907750A (en) * 2019-11-21 2020-03-24 国电南瑞南京控制系统有限公司 Power distribution main station single-phase earth fault positioning method and system based on medium resistance method
CN110907752A (en) * 2019-11-29 2020-03-24 科大智能电气技术有限公司 Method for acquiring transient initial point of zero-sequence current in single-phase earth fault of power distribution network
CN111289838A (en) * 2020-02-13 2020-06-16 国电南瑞科技股份有限公司 Single-phase earth fault positioning method and system based on distribution network PMU
CN113311288A (en) * 2021-05-11 2021-08-27 国网浙江省电力有限公司湖州供电公司 Small current grounding fault searching and positioning method and system

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