CN106940411B - A kind of single-phase ground fault line selecting method of small-electric current grounding system - Google Patents
A kind of single-phase ground fault line selecting method of small-electric current grounding system Download PDFInfo
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- 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
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- 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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/088—Aspects of digital computing
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Abstract
The invention belongs to Single-phase Earth Fault of Power System processing technology fields, and what is involved is a kind of single-phase ground fault line selecting method of small-electric current grounding system.Including 1) counting same bus historical failure data；2) same bus history ground path collection is extracted；3) determine that ground path historical failure is estimated under different time scales；4) ground path historical failure is estimated into Weighted Fusion；5) it is carried out drawing road route selection according to integrated ground probability；6) same bus historical failure data updates.Electrical quantity is by the disadvantage that the factors such as grid operation mode, device parameter are influenced and cause the rate of falsely dropping high when the present invention overcomes traditional selection method due to failure, improve accuracy rate and efficiency that single-phase earthing draws road route selection, it reduces and draws road route selection number, ensure distribution to user security reliable power supply.
Description
Technical field
The invention belongs to Single-phase Earth Fault of Power System processing technology fields, and what is involved is a kind of small current neutral grounding systems
Fault line selection method for single-phase-to-ground fault.
Background technique
Small current neutral grounding system is widely used in China's power distribution network at present, and when single-phase earthing occurs, fault current is smaller, and three
Phase voltage keeps symmetrical, still is able to continue to power to load, but non-faulting phase voltage rises to line voltage, not to the class of insulation
High user equipment easily causes phase fault, when grounding point capacitance current is more than limit value, can generate arc overvoltage,
Seriously threaten power grid and equipment safety.Therefore, when single-phase earthing occurs for small current neutral grounding system, dispatcher need to judge to connect as quickly as possible
Ground route, and then isolated fault.Traditional fault line selection method for single-phase-to-ground fault mainly has zero sequence drying method, zero sequence power method, bears
The intelligent algorithms such as sequence current method, signal injection method and neural network, fuzzy control, evidence theory method, these methods are equal
The variation of electrical quantity when dependent on failure by grid operation mode, load condition, line construction, current transformer precision, connects
The factors such as place transition resistance influence, and falsely drop rate height, it is difficult to obtain ideal effect.Single-phase earth fault line selection is still at present
So mainly by the artificial route selection of dispatcher, for there is the substation bus bar of a large amount of outlets, draw that road number is excessive, accident treatment time mistake
Long problem is not able to satisfy requirement of the user to power supply reliability more and more.
Summary of the invention
To overcome the shortcomings of the above selection method, the present invention provides a kind of single-phase grounded malfunction in grounded system of low current route selection
Method can fast and accurately find out faulty line when single-phase earthing occurs for small current neutral grounding system.
The present invention adopts the following technical solutions to achieve, a kind of single-phase grounded malfunction in grounded system of low current route selection side
Method, comprising the following steps:
1) same bus historical failure data is counted；
2) same bus history ground path collection is extracted；
3) determine that ground path historical failure is estimated under different time scales；
4) ground path historical failure is estimated into Weighted Fusion；
5) it is carried out drawing road route selection according to integrated ground probability；
6) same bus historical failure data updates.
The method specific steps are as follows:
1) as unit of a bus, the historical failure data of every route on the bus is divided into single-phase earthing, route
Tripping, defect processing three classes count the respectivelyxThe number of three classes permanent fault occurs for route、、, shape
At historical failure data library, whereinIndicate single-phase earthing number,Indicate line tripping number,Indicate fault location
Number is managed,x=0,1 ...,M,MGo out number of lines for the bus, and according to the actual motion of each outlet of the bus in current electric grid
Situation, the line tripping of corresponding line in real-time update historical failure data libraryAnd defect processingTwo class data；
2) all routes that singlephase earth fault occurred on bus described in step 1) are extracted, history of forming
Ground path collection, the number of element is denoted as in the sets of linesN；
3) according to the periodic law and distribution character of fault data in step 1) historical data base, the history of step 2 is determined
Ground path concentrates historical failure of the every route under long and short two different time scales to estimate, it is assumed that theiRoute exists
Historical failure under long and short two time scales estimate for、,i=0,1 ...,N, from the historical failure data in step 1)
Is intercepted in libraryiThe statistical data of route under corresponding time scale、,j=0,1,2, the calculating that historical failure is estimated
Formula is；
4) is determinediThe route ground connection weight that ground path historical failure is estimated under long and short two time scales、,；
Historical failure of the every route under different time scales is concentrated to estimate the history ground path of step 2
It is weighted fusion, predicts integrated ground probability of the every ground path under current state,；
5) the integrated ground probability size predicted according to step 4) is ranked up history ground path, is formed and draws Lu Xuan
Line sequence list, dispatcher carry out drawing road route selection according to the route for drawing route selection sequence list in road preferentially to concentrate history ground path, if
It is unsuccessful, draw road route selection according to a conventional method in remaining route；
6) road route selection is drawn as a result, if ground path is the of history ground path collection according to step 5)iRoute, then its
Corresponding singlephase earth fault dataAdd 1, if ground path is new line, more new historical ground path collection, element numberNAdd 1.
Electrical quantity is influenced to change by factors such as power grid, equipment when the present invention overcomes conventional method due to failure does not know and leads
The high disadvantage of rate is falsely dropped in cause, is analysis object with the historical data that same bus breaks down, by historical failure number
Analysis, Weighted Fusion according to statistics predict the integrated ground probability of history ground path, are formed and the guidance of road route selection sequence list is drawn to connect
Ground route selection reduces ground connection and draws road number, shorten the earthing wire-selecting time, has good route selection effect and accuracy rate, strong guarantor
Barrier distribution is securely and reliably powered.
Detailed description of the invention
Below with reference to attached drawing, the invention will be further described:
Fig. 1 is the flow chart of single-phase ground fault line selecting method of small-electric current grounding system of the present invention.
Specific embodiment
Further details of elaboration made to the present invention in the following with reference to the drawings and specific embodiments, but the invention is not limited to
Following implementation.
As shown in Figure 1, single-phase ground fault line selecting method of small-electric current grounding system of the present invention the following steps are included:
Step 1, the same bus historical failure data of statistics.A large amount of production practices show that event occurs for same bus
The route of barrier repeatability with higher, the type of each line failure are mainly shown as: single-phase earthing, route are jumped
Lock, defect three types, three kinds of fault types are connected each other, are mutually converted, and the same failure cause may start to behave as scarce
It falls into or ground connection, just develops into line tripping after a period of time, or specifically show as line tripping, it is next then show as single-phase connect
Ground, therefore the historical data that three classes failure occurs for same route is all included in sample, consideration joint uses, short-term instantaneity
The factors such as failure carry out data screening, reject invalid data, guarantee the accuracy and integrality of fault data.
The historical failure data of every route can be obtained from dispatch automated system D5000 or management and running log
It takes, is known to those skilled in the art, details are not described herein again.As unit of a bus, by every route on the bus
Historical failure data is divided into single-phase earthing, line tripping, defect processing three classes, counts respectivelyxThree classes occur for route forever
The number of long property failure、、, history of forming Mishap Database,Indicate single-phase earthing number,Indicate line
Road tripping times,Indicate defect processing number, whereinx=0,1 ...,M,MGo out number of lines for the bus.According to current electric grid
In each outlet of the bus practical operation situation, the line tripping of corresponding line in real-time update historical failure data library
And defect processingTwo class data.
Step 2 extracts all routes that singlephase earth fault occurred for a bus, history of forming ground path
Collect, element number is denoted as in the sets of linesN。
Step 3, according to the periodic law and distribution character of fault data in step 1) historical data base, determine that history is grounded
Historical failure of the every route under long and short two different time scales is estimated in sets of lines.The selection of long time scale should be
The periodicity of fault data is held, the ground line number under the time scale should concentrate all elements comprising history ground path, with
Characterize the chronicity rule of ground path.The selection of short-term time scale should hold the distribution character of fault data, mainly for connecing
The ground line failure rate higher period, to characterize the short-term rule of ground path.The generally optional 3-5 of long time scale is short
The optional 0.5-1 of time scale can be determined according to power grid practical operation situation.
TheiHistorical failure of the route under long and short two time scales estimate for、,i=0,1 ...,N, from going through
Is intercepted in history Mishap DatabaseiThe statistical data of route under corresponding time scale、,j=0,1,2, history event
Hindering the calculation formula estimated is。
Step 4 determines the ground connection weight that ground path historical failure is estimated under long and short two time scales、,；
It concentrates historical failure of the every route under different time scales to estimate history ground path and is weighted fusion,
Predict integrated ground probability of the every ground path under current state,。
Step 5 is ranked up history ground path according to the integrated ground probability size predicted, is formed and draws road route selection
Sequence list, dispatcher carries out drawing road route selection according to the route for drawing route selection sequence list in road preferentially to concentrate history ground path, if not
It is successful then draw road route selection according to a conventional method in remaining route.
Step 6, according to drawing road route selection as a result, if ground path is the of history ground path collectioniRoute, then it is corresponded to
Singlephase earth fault dataAdd 1, if ground path is new line, more new historical ground path collection, element numberNAdd 1.
Embodiment of above is the preferred embodiment of the present invention, is not to impose any restrictions to the present invention, it is any not
It is detached from made by essence of the present invention and simply modifies or convert, within the scope of protection of the patent of the invention.
Claims (1)
1. a kind of single-phase ground fault line selecting method of small-electric current grounding system, which comprises the following steps:
1) same bus historical failure data is counted,
As unit of a bus, the historical failure data of every route on the bus is divided into single-phase earthing, line tripping, is lacked
Processing three classes are fallen into, count the respectivelyxThe number of three classes permanent fault occurs for route、、, history of forming
Mishap Database, whereinIndicate single-phase earthing number,Indicate line tripping number,Indicate defect processing time
Number,x=0,1 ...,M,MGo out number of lines for the bus, and according to the practical operation situation of each outlet of the bus in current electric grid,
The line tripping of corresponding line in real-time update historical failure data libraryAnd defect processingTwo class data；
2) same bus history ground path collection is extracted,
All routes that singlephase earth fault occurred on bus described in step 1) are extracted, history of forming ground line
Road collection, the number of element is denoted as in the sets of linesN；
3) determine that ground path historical failure is estimated under different time scales,
According to the periodic law and distribution character of fault data in step 1) historical data base, the history ground line of step 2 is determined
Historical failure of the every route under long and short two different time scales is concentrated to estimate in road, it is assumed that theiRoute is long and short two
Historical failure under a time scale estimate for、,i=0,1 ...,N, cut from the historical failure data library in step 1)
TakeiThe statistical data of route under corresponding time scale、,j=0,1,2, the calculation formula that historical failure is estimated
For；
4) ground path historical failure is estimated into Weighted Fusion,
DetermineiThe route ground connection weight that ground path historical failure is estimated under long and short two time scales、,
；
5) it is carried out drawing road route selection according to integrated ground probability,
The integrated ground probability size predicted according to step 4) is ranked up history ground path, is formed and draws road route selection sequence
Table, dispatcher carries out drawing road route selection according to the route for drawing route selection sequence list in road preferentially to concentrate history ground path, if unsuccessful
Then draw road route selection according to a conventional method in remaining route；
6) same bus historical failure data updates,
Road route selection is drawn as a result, if ground path is the of history ground path collection according to step 5)iRoute, then its is corresponding
Singlephase earth fault dataAdd 1, if ground path is new line, more new historical ground path collection, element numberNAdd 1.
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| CN109001590B (en) * | 2018-05-04 | 2021-12-07 | 国网安徽省电力有限公司芜湖供电公司 | Single-phase grounding line selection method of grounding system |
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| CN113884817B (en) * | 2021-10-27 | 2023-09-01 | 国网江苏省电力有限公司镇江供电分公司 | Single-phase grounding fault grounding searching method for small-current grounding system |
| CN116008733A (en) * | 2023-03-21 | 2023-04-25 | 成都信息工程大学 | Single-phase grounding fault diagnosis method based on integrated deep neural network |
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