CN104297616A - 10kV distribution line breaking detection method based on multi-system information interaction - Google Patents
10kV distribution line breaking detection method based on multi-system information interaction Download PDFInfo
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Abstract
A 10kV distribution line breaking detection method based on multi-system information interaction is achieved on the basis of an existing power grid operation monitoring system through information interaction between multiple operation monitoring systems. According to the method, on the basis of a stereoscopic network topological relation involving a substation, an outgoing line, branch lines, distribution transformers and a typical low-voltage side, 10kV distribution line breaking warning information is provided for an operator by means of distribution transformer monitoring data, and the realistic problem that breaking faults of a 10kV distribution line are difficult to find is solved. Meanwhile, the method can be used in a provincial power grid operation monitoring center in a concentrated mode, unified operation and maintenance are achieved, 10kV distribution line breaking detection warning of a whole province is achieved, the mode that each station needs to be provided with a traditional power system automatic device is eliminated, investment for equipment purchasing, installation, debugging and daily maintenance and overhaul is greatly reduced, reliability of distribution network operation is improved, the safety hidden hazard that human casualty accidents are caused due to line breaking is reduced, cost of power enterprises is greatly reduced, and economic benefits and social benefits are good.
Description
technical field
The present invention relates to a kind of 10kV distribution line mutual based on multi-system information broken string method for detecting, belong to power information technical field of automation.
background technology
In China's network system; 10kV circuit is not solidly grounded system; once 10kV circuit generation singlephase earth fault even disconnection fault; 10kV protection for feed line can not directly trip; but show feeder line place bus one phase voltage for this reason and be reduced to zero; another two-phase voltage rise is 1.732 times of specified phase voltage, but the line voltage of this feeder line is still normal.
Current singlephase earth fault is judged by the Small Electric Current Earthing And Routing Device being arranged on transformer station usually.Provincial power network has quite a few transformer station not install Small Electric Current Earthing And Routing Device, and the transformer station of Small Electric Current Earthing And Routing Device is installed, wherein a part is due to Small Electric Current Earthing And Routing Device self problem, transformer station's integrated system can only judge that singlephase earth fault appears in certain section of bus, cannot accurately judge single-phase earthing or disconnection fault 10kV circuit occur.In addition according to management and running code, owing to not affecting user power utilization, 10kV circuit still can run 2 hours in generation singlephase earth fault situation, if but what occur is disconnection fault, circuit still charging operation can bring very big potential safety hazard, can cause human casualty accident time serious.Therefore Timeliness coverage 10kV line disconnection failure, takes respective handling measure significant for avoiding state's electricity grid company industrial accident.
China's electric system 10kV system is not solidly grounded system, substation transformer is mainly based on Dyn11 wiring, when 10kV circuit generation singlephase earth fault, transformer station shows feeder line place bus one phase voltage for this reason and is reduced to zero, another two-phase voltage rise is 1.732 times of specified phase voltage, but the line voltage of this feeder line is still normal.If 10kV circuit generation disconnection fault, and disconnection fault point is unearthed, now in transformer station operating condition without significant change, even singlephase earth fault can not reported, if break point distance mains side is comparatively near, operations staff reduces to judge circuit operation exception by broken string phase current, if but break point away from mains side, then this phase current reduces not obvious, brings very large difficulty to operations staff's Timeliness coverage fault.In addition along with the popularization of unattended operation transformer station, transformer station generally takes Centralized Monitoring pattern, and operator monitoring amount is large, find that a phase load electric current of certain 10kV feeder line reduces difficulty very big.
summary of the invention
The object of the invention is, in order to solve the detection problem of 10kV distribution line broken string, the utility model proposes a kind of 10kV distribution line mutual based on multi-system information broken string method for detecting.
Realizing technical scheme of the present invention is, for the network system being provided with EMS system and power information acquisition system, this method utilizes the singlephase earth fault alerting signal of producing in real-time managing and control system Real-time Collection EMS system, according to the corresponding relation in system, search for the substation transformer low-pressure side voltage signal be connected on this section of bus on all 10kV feeder lines, specific change is there is as found that there is substation transformer low-pressure side voltage, then judge that this feeder line there occurs disconnection fault, system sends alerting signal at once and takes treatment measures to repair personnel.
The performing step of a kind of 10kV distribution line mutual based on multi-system information broken string of the present invention method for detecting is:
(1) produce the daily normal operation of real-time managing and control system, collect 10kV distribution line and substation transformer operation information that EMS system and power information acquisition system monitor and be stored in data center;
(2) the 10kV distribution line broken string produced in real-time managing and control system detects application module according to the 10kV distribution line single-phase earthing signal in distribution transformer monitoring data frequency retrieve data storage center;
(3) after 10kV distribution line broken string detecting application module detects 10kV distribution line single-phase earthing signal, according to the three-dimensional network topology of transformer station-outlet-branch line-distribution transforming-typical low pressure side, start to retrieve the last and operational monitoring data next time of institute's tape splicing substation transformer under this 10kV distribution line;
(4) 10kV distribution line broken string detecting application module is to substation transformer twice operational monitoring data analysis, during as found that certain distribution transforming voltage Monitoring Data reaches alarm threshold value, namely this distribution low-voltage side voltage has one mutually normal, the amplitude of another two-phase between the 40%-60% of rated voltage amplitude, then judges that this circuit disconnection fault may occur;
(5) 10kV distribution line broken string detecting application module sends this distribution line broken string alarm signal, and with short message mode notice supervisory control of substation, personnel take break line treatment measure to this 10kV distribution line.
Described 10kV distribution line broken string detecting application module is software module, and its function pushes away 10kV distribution line broken string by substation transformer low-pressure side voltage magnitude variable quantity is counter, and decision threshold range intervals is large; Improving by promoting the operation information frequency acquisition of power information acquisition system to substation transformer the detecting speed that 10kV distribution line is broken, in 30 minutes, detecting 10kV distribution line disconnection fault; Coordinate generalized information system (Geographic Information System) information, 10kV distribution line broken string detecting application module also can realize the localization of fault to 10kV distribution line break point.
Ultimate principle of the present invention is, China's electric system 10kV system is not solidly grounded system, substation transformer is mainly based on Dyn11 wiring, when 10kV circuit generation singlephase earth fault, transformer station shows feeder line place bus one phase voltage for this reason and is reduced to zero, another two-phase voltage rise is 1.732 times of specified phase voltage, but the line voltage of this feeder line is still normal.If 10kV circuit generation disconnection fault, and disconnection fault point is unearthed, now in transformer station operating condition without significant change, even singlephase earth fault can not reported, if break point distance mains side is comparatively near, operations staff reduces to judge circuit operation exception by broken string phase current, if but break point away from mains side, then this phase current reduces not obvious, brings very large difficulty to operations staff's Timeliness coverage fault.In addition along with the popularization of unattended operation transformer station, transformer station generally takes Centralized Monitoring pattern, and operator monitoring amount is large, find that a phase load electric current of certain 10kV feeder line reduces difficulty very big.Therefore, accurately and timely to detect 10kV feeder line generation disconnection fault, can not only rely on substation equipment operation information to judge, and will in conjunction with this circuit substation transformer operation information.Below with the change of Dyn11 substation transformer operating condition after 10kV feeder line generation Down-Line Fault Analysis break point.
Time normal, 10kV feeder line U
a, U
b, U
camplitude is 5.77kV, phase 120 °, substation transformer high side voltage U
a＇ U
b＇ U
c＇ amplitude is 5.77kV, phase 120 °, and distribution low-voltage side output voltage Ua, Ub, Uc amplitude is 220V, and phase 120 °, wiring schematic diagram as shown in Figure 5.
When there is broken string in A phase, 10kV feeder line U
a, U
b, U
camplitude is 5.77kV, phase 120 °, and substation transformer high-pressure side A phase voltage is 0, B, C phase voltage is 5.77kV, phase place and normal time remain unchanged, wiring schematic diagram is as shown in Figure 6.Now substation transformer low-pressure side output voltage is that Ua, Ub, Uc amplitude is respectively 110V, 220V, 110V, a phase identical with the phase place of c phase voltage and with the phase 180 ° of b phase.
The invention has the beneficial effects as follows, the inventive method is based upon in existing grid operating monitoring system-based, without the need to increasing hardware device.This method is useful in provincial power network operational monitoring center centralized arrangement, and unified O&M, realizes the whole province 10kV distribution line disconnection monitoring, does not increase company of ground cities and counties of the whole province maintenance work amount.
accompanying drawing explanation
Fig. 1 is 10kV distribution line disconnection fault detecting process flow diagram; Fig. 2 is for producing real-time managing and control system and all the other system connected mode schematic diagram; Fig. 3 is for producing real-time managing and control system Technical Architecture schematic diagram; Fig. 4 is for producing real-time managing and control system building-block of logic;
Fig. 5 is the normal operation wiring schematic diagram of 10kV distribution line; Fig. 6 is 10kV distribution line broken string operation wiring schematic diagram.
Embodiment
The present invention specifically implements at Jiangxi Province's electrical network:
The invention process comprises data acquisition, gathers the bus singlephase earth fault signal in transformer station's signal; 10kV distribution line broken string detecting application module, to substation transformer operational monitoring and analysis, judges the contingent disconnection fault of circuit and sends this distribution line broken string alarm signal.
The data acquisition of the present embodiment utilizes power information acquisition system and EMS(energy management system).
All 12 prefecture-level companies of current Jiangxi Province Power Network company are built EMS system, EMS system achieves ground county and adjusts integration, the all Inspect and control combined from transformer station of this prefecture-level company and company of administrative county can be realized, by EMS system, the corresponding relation of substation bus bar singlephase earth fault information and all 10kV feeder lines and 10kV bus can be obtained.
Jiangxi Province Power Network company builds power information acquisition system, cover the whole province's 130,000 public substation transformers, coverage rate reaches 97.6%, by being installed on data collection station Real-time Collection substation transformer working voltage, electric current, power and the electric quantity data on substation transformer, and be sent to power information acquisition system main website of company of province by GPRS information.
Because substation equipment operation information and substation transformer operation information adhere to different system separately, according to State Grid Corporation of China's safety management regulations, EMS system data is stored in 1st district, power information acquisition system data are stored in 3rd district, senior application is realized for obtaining two system datas, Jiangxi Province Power Network company has built up the real-time managing and control system of production by exchange technology, by distinguishing development data interface with EMS system and power information acquisition system, collect substation equipment operation information and the substation transformer operation information of EMS system, achieve the data sharing of EMS system and power information acquisition system, the real-time managing and control system of current production has accessed with adopting distribution transforming collecting device 132280, districts and cities and company of county plant stand access 1450, distribution line 9000, and corresponding low-pressure side user data.Build up the three-dimensional network topology of transformer station-outlet-branch line-distribution transforming-typical low pressure side.Produce real-time managing and control system and all the other system connected modes as shown in Fig. 2.
Produce the self-built data storage center of real-time managing and control system, can be stored in data center from EMS system and power information acquisition system information by what collect, and the basis of the heart in the data develops application service layer and presentation layer, analyzing and processing is carried out on the basis of the application service layer heart in the data, realize various application function, presentation layer is as system terminal, achieve the web access function of system terminal, user can realize the remote access function to system by the communication information net of company of province.The concrete framework of system is shown in Fig. 3, and logic level divides sees Fig. 4.
As shown in Figure 3, produce real-time managing and control system general frame to comprise:
Data active layer: the data source of native system comes from major network PMS, rural power PMS, the plant stand EMS connecting system of various places, electricity consumption acquisition system, fault-indicating system, distribution automation, distribution transformer terminals monitoring.
Data Integration and data collection layer: native system is on the basis that CIM/CIS, WebServices technology and data normalization are studied, establish uniform data collection and data bus platform, the point-to-point crossover network achieved between the application of each system is connected to data bus to carry out the transformation of message exchange.In order to realize the convenient exchange of data between each system, data bus is as the switching centre of data, and the interim real-time achieving electric network model and real-time grid data stores, the up-to-date section of bus store electricity pessimistic concurrency control and real time data.Data bus is responsible for from data active layer acquisition number certificate, and provides data to data center's layer.
Data storage layer: data storage layer obtains data by data access bus layer, and data are integrated, set up the electric network data center that application is irrelevant, comprise real time data, historical data, artwork data etc., wherein real-time data base, historical data base etc. are with standard, unified, open, transparent pattern, there is provided safe, efficient, open, transparent data, services to multiple application, really achieve Distributed database service management.Data center adopts Unified coding to device model object, historical data code requirement, normalization storage mode, provides basis for each business datum realizes normalized data access service.
Data service layer: by functional realiey such as data version management, Data Quality Analysis, fault trip analysis, data model management, historical data management, real time data releasing, artwork management to the arrangement, verification, calculating, analysis etc. of data centre data unified process maintenance management function, make data meet the service application needs of various situation.And from the data of magnanimity, excavate significant information by the service such as data, services, aid decision making, realize the general of electrical network and particular analysis, to instruct the routine work of electrical network production run personnel.
Data application layer: based on controller switching equipment Monitoring Data center and data, services, need and various analytical model in conjunction with specific transactions, adopt collection SVG figure plug-in unit, portlet technology, Flash icon-based techniques, Ajax and Flex page technology etc. are in the uniform data exhibition platform of one, realize distribution transforming Real-Time Monitoring, distribution line is monitored, distribution fault tripping operation is analyzed, distribution evaluation of power supply capability is analyzed, the functions such as distribution transformation analysis, realize the three-dimensional real-time management and control to transformer station-outlet-branch line-distribution transforming-low pressure typical user, real-time control 10kV outlet, distribution transforming, the voltage of user side, electric current, meritorious, idle, analyze the equipment general level of the health, analyze electrical network weak link, secondary distribution net is transformed, and realizes analyzing power distribution network, diagnose, assess and evaluating.
10kV distribution line broken string detecting function can realize according to following steps:
1) produce the daily normal operation of real-time managing and control system, collect 10kV distribution line and substation transformer operation information that EMS system and power information acquisition system monitor and be stored in data center;
2) the 10kV distribution line broken string produced in real-time managing and control system detects application module according to the 10kV distribution line single-phase earthing signal in distribution transformer monitoring data frequency retrieve data storage center;
3) after 10kV distribution line broken string detecting application module detects 10kV distribution line single-phase earthing signal, according to the three-dimensional network topology of transformer station-outlet-branch line-distribution transforming-typical low pressure side, start to retrieve the last and operational monitoring data next time of institute's tape splicing substation transformer under this 10kV distribution line;
4) 10kV distribution line broken string detecting application module is to substation transformer twice operational monitoring data analysis, during as found that certain distribution transforming voltage Monitoring Data reaches alarm threshold value, namely this distribution low-voltage side voltage has one mutually normal, the amplitude of another two-phase between the 40%-60% of rated voltage amplitude, then judges that this circuit disconnection fault may occur;
5) 10kV distribution line broken string detecting application module sends this distribution line broken string alarm signal, and with short message mode notice supervisory control of substation, personnel take break line treatment measure to this 10kV distribution line.
The method has following technical characteristic:
1) realize with software function module form based on existing grid monitoring system, do not need to add any hardware;
2) principle is simple, and feature is obvious, and push away 10kV distribution line broken string by substation transformer low-pressure side voltage magnitude variable quantity is counter, decision threshold range intervals is large, and application is convenient;
3) improving by promoting the operation information frequency acquisition of power information acquisition system to substation transformer the detecting speed that 10kV distribution line is broken, in 30 minutes, detecting 10kV distribution line disconnection fault;
4) coordinate generalized information system (Geographic Information System) information, the localization of fault to 10kV distribution line break point can be realized.
Claims (3)
1. based on the 10kV distribution line broken string method for detecting that multi-system information is mutual, it is characterized in that, described method utilizes produces real-time managing and control system, the singlephase earth fault alerting signal in Real-time Collection EMS system; According to the corresponding relation in system, search for the substation transformer low-pressure side voltage signal be connected on this section of bus on all 10kV feeder lines, judge the disconnection fault that feeder line occurs, the performing step of described method is as follows:
(1) collect 10kV distribution line and substation transformer operation information that EMS system and power information acquisition system monitor and be stored in data center;
(2) the 10kV distribution line broken string produced in real-time managing and control system detects application module according to the 10kV distribution line single-phase earthing signal in distribution transformer monitoring data frequency retrieve data storage center;
(3) after 10kV distribution line broken string detecting application module detects 10kV distribution line single-phase earthing signal, according to the three-dimensional network topology of transformer station-outlet-branch line-distribution transforming-typical low pressure side, start to retrieve the last and operational monitoring data next time of institute's tape splicing substation transformer under this 10kV distribution line;
(4) 10kV distribution line broken string detecting application module is to substation transformer twice operational monitoring data analysis, during as found that certain distribution transforming voltage Monitoring Data reaches alarm threshold value, namely this distribution low-voltage side voltage has one mutually normal, the amplitude of another two-phase between the 40%-60% of rated voltage amplitude, then judges that this circuit disconnection fault may occur;
(5) 10kV distribution line broken string detecting application module sends this distribution line broken string alarm signal, and with short message mode notice supervisory control of substation, personnel take break line treatment measure to this 10kV distribution line.
2. a kind of 10kV distribution line mutual based on multi-system information broken string method for detecting according to claim 1, it is characterized in that, described method utilize on the three-dimensional network topology basis of transformer station-outlet-branch line-distribution transforming-typical low pressure side distributing transformer monitoring data for operations staff provide 10kV distribution line break warning information.
3. a kind of 10kV distribution line mutual based on multi-system information broken string method for detecting according to claim 1, it is characterized in that, described 10kV distribution line broken string detecting application module is software module, its function pushes away 10kV distribution line broken string by substation transformer low-pressure side voltage magnitude variable quantity is counter, and decision threshold range intervals is large; Improving by promoting the operation information frequency acquisition of power information acquisition system to substation transformer the detecting speed that 10kV distribution line is broken, 10kV distribution line disconnection fault can be detected in 30 minutes; Coordinate generalized information system information, 10kV distribution line broken string detecting application module also can realize the localization of fault to 10kV distribution line break point.
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| CN106019067A (en) * | 2016-05-13 | 2016-10-12 | 国网江西省电力科学研究院 | Dyn11 distribution transformer winding connection joint open-circuit fault detection method |
| CN107329028A (en) * | 2017-06-01 | 2017-11-07 | 国网江西省电力公司电力科学研究院 | A kind of method for detecting of Yyn0 types distribution transforming winding connecting joint open circuit |
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| CN105743108B (en) * | 2016-01-31 | 2018-06-26 | 科誉德电气（苏州）有限公司 | A kind of 10kV low-voltage intelligent distribution network systems with three-phase imbalance monitoring function |
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Effective date of registration: 20180724 Address after: 330096 No. 88, min Qiang Road, private science and Technology Park, Nanchang, Jiangxi Co-patentee after: State Grid Corporation of China Patentee after: Power Science Research Institute of Jiangxi Electric Power Co., Ltd. Address before: 100761 West Chang'an Avenue, Xicheng District, Xicheng District, Beijing Co-patentee before: State's net Jiangxi Province Electric power Science Academe Patentee before: State Grid Corporation of China |