CN107991579A - A kind of distribution single-phase earth fault line selection based on electrical power distribution automatization system, localization method and its realize system - Google Patents
A kind of distribution single-phase earth fault line selection based on electrical power distribution automatization system, localization method and its realize system Download PDFInfo
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- CN107991579A CN107991579A CN201711205503.2A CN201711205503A CN107991579A CN 107991579 A CN107991579 A CN 107991579A CN 201711205503 A CN201711205503 A CN 201711205503A CN 107991579 A CN107991579 A CN 107991579A
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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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- 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
Abstract
The present invention relates to a kind of distribution single-phase earth fault line selection based on electrical power distribution automatization system, localization method and its realize system, including：(1) during power distribution network normal operation, the zero-sequence current amplitude of each distribution power automation terminal in each feeder line is obtained, i.e., specified zero-sequence current amplitude；(2) when singlephase earth fault occurs for power distribution network, the zero-sequence current amplitude of each distribution power automation terminal in each feeder line, i.e. failure zero-sequence current amplitude are obtained；(3) difference of the failure zero-sequence current amplitude with the specified zero-sequence current amplitude of corresponding each distribution power automation terminal is calculated in real time；(4) judge difference whetherBetween, if all distribution power automation terminal of certain feeder line is satisfied by, which is earth fault feeder line, between two distribution power automation terminals of difference mutation is ground area on earth fault feeder line.The present invention is judged using all sectional monitoring points of earth fault mains side, significantly improves the correctness of small current earthing wire-selecting.
Description
Technical field
The present invention relates to a kind of distribution single-phase earth fault line selection based on electrical power distribution automatization system, localization method and in fact
Existing system, belongs to electrical power distribution automatization system technical field.
Background technology
When singlephase earth fault occurs for neutral by arc extinction coil grounding distribution network systems, generally connect according to substation's low current
Ground line selection apparatus route selection instruction, into row line drawing, with failure judgement circuit.Due to substation's Small Electric Current Earthing And Routing Device only
Each feed line exit zero-sequence current is taken to be judged that route selection accuracy rate is not high, Easy open non-fault line, constraining power supply can
By the lifting of property, since fault zone can not be accurately positioned, to distribution, fortune inspection personnel add line walking workload.
With the upgrading and the continuous transformation of the supporting secondary device of distribution of electrical power distribution automatization system, form to automate master
Centered on standing, there are each feed line 3~5 station power distribution automatization terminals (DTU or FTU) feeder line is divided into some sections, and distribution is automatic
Change terminal (DTU or FTU) to be connected with main website by optical fiber or wireless communication, extract zero-sequence current at each segmentation of feeder line and become ground conveniently
Fast, be conducive to carry out zero-sequence current amplitude comparative analysis in a wide range of, can be rapid using the calculating speed that computer is ultrafast
Faulty line is accurately determined, positions fault zone.So that develop a kind of distribution single-phase earthing based on electrical power distribution automatization system
Failure line selection, positioning function are promoted and applied.
Chinese patent literature CN 103728532A disclose a kind of one-phase earthing failure in electric distribution network judgement and localization method,
Comprise the following steps：Block switch is set on the circuit of power distribution network, power distribution automation line feed terminals are configured on block switch, are matched somebody with somebody
Electric automation line feed terminals establish network service；Power distribution automation line feed terminals judge line single phase grounding failure, judge single-phase
Earth fault is located at the block switch adjacent sections where the power distribution automation line feed terminals.But patent needs are adjacent
Automatization terminal establish communication connection, and each automatization terminal is both needed to have the function of logic analysis, adds extra cost；If
The communication connection of certain adjacent automatization terminal is broken down, then can not correctly be judged when earth fault occurs for the region；It is needed
Transient information is gathered, it is higher to device required precision, it is necessary to which larger output power, device power supply are also a problem.
Chinese patent literature CN 106154116A disclose a kind of distribution net work earthing fault localization method, including step：1)
By the distribution power automation terminal of installation on the line, include but not limited to DTU, FTU and fault detector etc., can measure
Each phase current of circuit, and each terminal can realize communication function with distribution main website；2) when single-phase connect occurs for distribution network system
During earth fault, distribution power automation terminal can calculate the Sudden Changing Rate before and after each phase current failure, and the Sudden Changing Rate is sent to and is matched somebody with somebody
Electric main website；3) distribution main website calculates each phase longitudinal current Sudden Changing Rate of adjacent node according to each node difference of phase currents above sent,
And normalized, fault location is grounded according to longitudinal current Sudden Changing Rate normalized value, and fault location point is included
The dynamic topology computing of distribution main website.But the patent needs the harvester of degree of precision, increase extra cost；Need certainly
Dynamicization terminal carries out the calculating of larger workload, it is necessary to which terminal upgrade is transformed；After distribution network changes the method for operation, it is impossible to suitable
With the new method of operation.
The content of the invention
In view of the deficiencies of the prior art, the present invention provides a kind of distribution single-phase earthing event based on electrical power distribution automatization system
Hinder route selection, localization method；
Present invention also offers the above-mentioned distribution single-phase earth fault line selection based on electrical power distribution automatization system, localization method
Realize system.
The technical scheme is that：
A kind of distribution single-phase earth fault line selection, localization method based on electrical power distribution automatization system, the distribution include mother
Line and some feeder lines being connected respectively with the busbar, a ground wire, the electrical power distribution automatization system include main website, often
Some distribution power automation terminals are provided with described in bar on feeder line, the distribution power automation terminal connects the main website, including：
(1) during power distribution network normal operation, electrical power distribution automatization system remote measurement obtains each distribution power automation terminal in each feeder line
Zero-sequence current amplitude, i.e., specified zero-sequence current amplitude, and preserve；
(2) when singlephase earth fault occurs for power distribution network, it is automatic that electrical power distribution automatization system remote measurement obtains each distribution in each feeder line
Change the zero-sequence current amplitude of terminal, i.e. failure zero-sequence current amplitude；
(3) correspondence for the corresponding feeder line that the failure zero-sequence current amplitude that calculation procedure (2) obtains in real time is obtained with step (1)
The difference of the specified zero-sequence current amplitude of each distribution power automation terminal；
(4) whether the difference that judgment step (3) obtains is in 0.9 α * I∑C~1.1 α * I∑CBetween, if certain feeder line owns
Distribution power automation terminal be satisfied by difference in 0.9 α * I∑C~1.1 α * I∑CBetween, then the feeder line is earth fault feeder line, is connect
It is ground area between two distribution power automation terminals that difference is mutated on earth fault feeder line, α is Reactive Compensation Factor, value model
Enclose for 5%~20%, I∑CFor electrical power distribution automatization system total capacitance current over the ground；Otherwise, judge the feeder line for non-faulting line
Road, return to step (3).
The route selection of the present invention, localization method compared with the existing methods, are put into, it is not necessary to outer to install additional without extra charge
Put, existing apparatus need to only be upgraded, realized convenient and efficient.Zero-sequence current data is used as by the use of existing distribution power automation terminal
Collection point, each feed line have several data collection points, contrast a collection point in traditional substation bus bar exit, can
More than 200% is improved by property.
Preferable according to the present invention, the distribution power automation terminal is DTU or FTU.
Preferable according to the present invention, the distribution power automation terminal connects the main website by optical fiber or wireless communication.
It is preferable according to the present invention, the 3-5 distribution power automation terminals are provided with every feeder line.Each feed line
With 3-5 data collection point, a collection point in traditional substation bus bar exit is contrasted, reliability improves 200%
More than.
Preferable according to the present invention, in the step (4), setting the n bar feeder lines that the busbar connects respectively has, then
I∑CAsk for shown in formula such as formula (I)：
IΣC=I1 Σ C of feeder line+I2 Σ C of feeder line+I3 Σ C of feeder line+...+IFeeder line i Σ C...+IFeeder line n Σ C (I)
In formula (I), IFeeder line i Σ CRepresent i-th feeder line capacitive earth current, i is integer and 1≤i≤n.
The above-mentioned distribution single-phase earth fault line selection based on electrical power distribution automatization system, localization method realize system, including
Sequentially connected specified zero-sequence current amplitude computing module, failure zero-sequence current amplitude computing module, difference calculating module, judgement
Module；
The specified zero-sequence current amplitude computing module be used to obtaining in distribution normal operation in each feeder line each distribution from
The specified zero-sequence current amplitude of dynamicization terminal；Failure zero-sequence current amplitude computing module is used for real-time telemetry and obtains in each feeder line respectively
The failure zero-sequence current amplitude of distribution power automation terminal；The difference calculating module is used to calculate the specified zero-sequence current in real time
The corresponding feedback that the specified zero-sequence current amplitude that amplitude computing module obtains is obtained with the failure zero-sequence current amplitude computing module
The failure zero-sequence current amplitude difference of the correspondence distribution power automation terminal of line；The judgment module is used to judge that earth fault is presented
Line and ground area.
Preferable according to the present invention, the judgment module is used to judge earth fault feeder line and ground area, including：Sentence
Whether offset value is in 0.9 α * I∑C~1.1 α * I∑CBetween, if all distribution power automation terminal of certain feeder line is satisfied by difference
In 0.9 α * I∑C~1.1 α * I∑CBetween, then the feeder line is earth fault feeder line, two of difference mutation on earth fault feeder line
It is ground area between distribution power automation terminal, α is Reactive Compensation Factor, and value range is 5%~20%, I∑CFor distribution certainly
Dynamicization system total capacitance current over the ground；Otherwise, the feeder line is judged for non-fault line, and the specified zero-sequence current amplitude calculates
Module continues the specified zero-sequence current amplitude of the next distribution power automation terminal of remote measurement.
Beneficial effects of the present invention are：
1st, the present invention is judged using all distribution power automation terminals of earth fault mains side (DTU or FTU), often
Bar feeder line has 3-5 data collection point, contrasts a collection point in traditional substation bus bar exit, and reliability improves
More than 200%, the reduction that drawing non-fault line causes power supply reliability is avoided, simultaneous ground fault point is accurately positioned,
The labor intensity of fortune inspection personnel can be significantly reduced.
2nd, the further perfect electrical power distribution automatization system of the present invention, while improve the automation journey of distribution operational management
Degree, has further promoted the development of electrical power distribution automatization system.
3rd, add-on device is not required in the application, it is not required that collection transient information, analysis calculating is carried out by main website, you can
Determine fault zone, when some automatization terminal is offline, also can determine fault zone by two terminals before and after it.
4th, the application gathers zero-sequence current amplitude using existing zero sequence CT, it is automatic to be uploaded to distribution without extra cost
Change main website, analyzed by main website, suitable for distribution real time operation mode, simply, conveniently, flexibly.
Brief description of the drawings
Zero-sequence current when Fig. 1 is distribution normal operation, capacitance current flow to schematic diagram；
Zero-sequence current flows to schematic diagram when Fig. 2 is single-phase earthing；
Fig. 3 is the distribution single-phase earth fault line selection based on electrical power distribution automatization system, the company for realizing system of localization method
Connect block diagram；
Fig. 4 is the distribution single-phase earth fault line selection based on electrical power distribution automatization system, the boundary for realizing system of localization method
Face schematic diagram；
Embodiment
The present invention is further qualified with reference to Figure of description and embodiment, but not limited to this.
Embodiment 1
A kind of distribution single-phase earth fault line selection, localization method based on electrical power distribution automatization system, distribution include busbar with
And some feeder lines, the ground wire being connected respectively with busbar, electrical power distribution automatization system are automatic for distribution built at present
Change system, i.e., centered on automating main website, each feed line has 3-5 station power distributions automatization terminal (DTU or FTU) by feeder line point
For some sections, distribution power automation terminal is connected by optical fiber or wireless communication with main website, can upload the information such as remote signalling, remote signalling.On
State all terminals and configure zero sequence CT and complete zero-sequenceprotection function, upgrading terminals (DTU or FTU) program is only needed, distant
On brake, zero-sequence current amplitude telemetry function is added, at present existing ripe technology, it is convenient to realize；Including：
(1) during power distribution network normal operation, electrical power distribution automatization system remote measurement obtains each distribution power automation terminal in each feeder line
Zero-sequence current amplitude, i.e., specified zero-sequence current amplitude, and preserve；
(2) when singlephase earth fault occurs for power distribution network, it is automatic that electrical power distribution automatization system remote measurement obtains each distribution in each feeder line
Change the zero-sequence current amplitude of terminal, i.e. failure zero-sequence current amplitude；
(3) correspondence for the corresponding feeder line that the failure zero-sequence current amplitude that calculation procedure (2) obtains in real time is obtained with step (1)
The difference of the specified zero-sequence current amplitude of each distribution power automation terminal；
(4) whether the difference that judgment step (3) obtains is in 0.9 α * I∑C~1.1 α * I∑CBetween, if certain feeder line owns
Distribution power automation terminal be satisfied by difference in 0.9 α * I∑C~1.1 α * I∑CBetween, then the feeder line is earth fault feeder line, is connect
It is ground area between two distribution power automation terminals that difference is mutated on earth fault feeder line, α is Reactive Compensation Factor, and value is
5%, I∑CFor electrical power distribution automatization system total capacitance current over the ground；Otherwise, the feeder line is judged for non-fault line, return to step
(3)。
The n bar feeder lines that setting busbar connects respectively have, then I∑CAsk for shown in formula such as formula (I)：
IΣC=I1 Σ C of feeder line+I2 Σ C of feeder line+I3 Σ C of feeder line+...+IFeeder line i Σ C...+IFeeder line n Σ C (I)
In formula (I), IFeeder line i Σ CRepresent i-th feeder line capacitive earth current, i is integer and 1≤i≤n.
The route selection of the present invention, localization method compared with the existing methods, are put into, it is not necessary to outer to install additional without extra charge
Put, existing apparatus need to only be upgraded, realized convenient and efficient.Zero-sequence current data is used as by the use of existing distribution power automation terminal
Collection point, each feed line have 3-5 data collection point, contrast a collection point in traditional substation bus bar exit, can
More than 200% is improved by property.
The method of the present embodiment is verified below：
Choose three feeder line rack of neutral by arc extinction coil grounding distribution to be analyzed, as shown in Figure 1, each feed line is each
Segmentation and its connection branch line direct-to-ground capacitance are integrated into equivalent capacity, i.e., often segmentation direct-to-ground capacitance is substituted with an equivalent capacity.
Zero-sequence current is system capacitive earth current during system normal operation, and direction flows to feeder line (black arrow) by busbar.
During system normal operation, by taking feeder line 1 as an example,
Zero-sequence current is whole circuit capacitive earth current I at monitoring point 11 is normal=ICL1+ICL2+ICL3+ICL4+ICL5；
Zero-sequence current I at monitoring point 22 is normal=ICL2+ICL3+ICL4+ICL5；
Zero-sequence current I at monitoring point 33 is normal=ICL3+ICL4+ICL5；
Zero-sequence current I at monitoring point 44 is normal=ICL4+ICL5；
Zero-sequence current I at monitoring point 55 is normal=ICL5；
The total capacitance current of system, for the sum of all feeder line capacitive earth currents：That is I∑C=I1 ∑ C of feeder line+I2 ∑ C of feeder line+
I3 ∑ C of feeder line；
Arc suppression coil generally uses overcompensation mode, and penalty coefficient α, generally takes 5%~20%, arc suppression coil compensation
Inductance current is：IL=(1+ α) * I∑C；
When singlephase earth fault occurs for system, zero-sequence current trend, such as Fig. 2：→ system capacitive earth current is represented,
Arc suppression coil compensation inductive current is represented, current reference direction is chosen unanimously, but capacitance current is differed with inductive current phase
180 ° ,-→ represents system zero-sequence current flow direction.
By taking feeder line 1 the 3rd is segmented generation singlephase earth fault as an example, zero-sequence current is at monitoring point 1：
I1 failure=IL-(I2 Σ C of feeder line+I3 Σ C of feeder line)
=(1+ α) * IΣC-(IΣC-I1 Σ C of feeder line)
=α * IΣC+I1 Σ C of feeder line
=α * IΣC+I1 is normal
Zero-sequence current is at monitoring point 2：I2 failures=IL-(I2 Σ C of feeder line+I3 Σ C of feeder line+ICL1)=α * IΣC+I2 is normal
Zero-sequence current is at monitoring point 3：I3 failures=IL-(I2 Σ C of feeder line+I3 Σ C of feeder line+ICL1+ICL2)=α * IΣC+I3 is normal
Zero-sequence current is at monitoring point 4：I4 failures=I4 is normal
Zero-sequence current is at monitoring point 5：I5 failures=I5 is normal
It is consistent when zero-sequence current value is with its normal operation at each monitoring point on non-faulting feeder line.
Therefore deduce that：When singlephase earth fault occurs for system, when non-faulting feeder line zero-sequence current is with its normal operation
Unanimously；It is consistent when fault feeder earth point load side region zero-sequence current is with its normal operation；Fault feeder earth point mains side
Region zero-sequence current is than adding α * I during its normal operationΣC, wherein α is penalty coefficient, IΣCFor the total direct-to-ground capacitance electricity of system
Stream.
After singlephase earth fault occurs for system, the change of zero-sequence current amplitude at each sectional monitoring point is contrasted, you can judge
Be out of order feeder line, positioning both ground fault zone.Thus, it can be inferred that the correctness of the present embodiment method.
Embodiment 2
A kind of distribution single-phase earth fault line selection based on electrical power distribution automatization system according to embodiment 1, positioning side
Method, difference lies in the value of α is 20% for it.
Embodiment 3
A kind of distribution single-phase earth fault line selection based on electrical power distribution automatization system according to embodiment 1, positioning side
Method, difference lies in the value of α is 12% for it.
Embodiment 4
Any distribution single-phase earth fault line selection, the localization methods based on electrical power distribution automatization system of embodiment 1-3
Realize system, as shown in Fig. 2, including sequentially connected specified zero-sequence current amplitude computing module, failure zero-sequence current amplitude
Computing module, difference calculating module, judgment module；
Specified zero-sequence current amplitude computing module is used to obtain each power distribution automation in each feeder line in distribution normal operation
The specified zero-sequence current amplitude of terminal；Failure zero-sequence current amplitude computing module is used for real-time telemetry and obtains each distribution in each feeder line
The failure zero-sequence current amplitude of automatization terminal；Difference calculating module is used to calculate specified zero-sequence current amplitude computing module in real time
The correspondence distribution for the corresponding feeder line that the specified zero-sequence current amplitude obtained is obtained with failure zero-sequence current amplitude computing module is automatic
Change the failure zero-sequence current amplitude difference of terminal；Judgment module is used to judge earth fault feeder line and ground area.
Judgment module is used to judge earth fault feeder line and ground area, including：Judge difference whether in 0.9 α * I∑C
~1.1 α * I∑CBetween, if all distribution power automation terminal of certain feeder line is satisfied by difference in 0.9 α * I∑C~1.1 α * I∑C
Between, then the feeder line is earth fault feeder line, on earth fault feeder line between two distribution power automation terminals of difference mutation
For ground area, α is Reactive Compensation Factor, and value range is 5%~20%, I∑CFor electrical power distribution automatization system total electricity over the ground
Capacitance current；Otherwise, the feeder line is judged for non-fault line, and the specified zero-sequence current amplitude computing module continues that remote measurement is next to match somebody with somebody
The specified zero-sequence current amplitude of electric automation terminal.
The realization of single-phase earth fault line selection, positioning function depends on electrical power distribution automatization system, and function module interface is as schemed
4.After detecting that certain becomes station station generation singlephase earth fault, fault network busbar and its all feeder lines of connection are locked.
Claims (7)
1. a kind of distribution single-phase earth fault line selection, localization method based on electrical power distribution automatization system, it is characterised in that described to match somebody with somebody
Net includes busbar and some feeder lines being connected respectively with the busbar, a ground wire, the electrical power distribution automatization system bag
Main website is included, some distribution power automation terminals are provided with every feeder line, the distribution power automation terminal connects the main website,
Including：
(1) during power distribution network normal operation, electrical power distribution automatization system remote measurement obtains the zero sequence of each distribution power automation terminal in each feeder line
Current amplitude, i.e., specified zero-sequence current amplitude, and preserve；
(2) when singlephase earth fault occurs for power distribution network, it is whole that electrical power distribution automatization system remote measurement obtains each power distribution automation in each feeder line
The zero-sequence current amplitude at end, i.e. failure zero-sequence current amplitude；
(3) correspondence for the corresponding feeder line that the failure zero-sequence current amplitude that calculation procedure (2) obtains in real time is obtained with step (1) is respectively matched somebody with somebody
The difference of the specified zero-sequence current amplitude of electric automation terminal；
(4) judgment step (3) obtain difference whetherBetween, match somebody with somebody if certain feeder line is all
Electric automation terminal is satisfied by difference and existsBetween, then the feeder line is earth fault feeder line, ground connection event
It is ground area between two distribution power automation terminals that difference is mutated on barrier feeder line, α is Reactive Compensation Factor, and value range is
5%~20%, I∑CFor electrical power distribution automatization system total capacitance current over the ground；Otherwise, judge that the feeder line for non-fault line, returns
Return step (3).
2. a kind of distribution single-phase earth fault line selection based on electrical power distribution automatization system according to claim 1, positioning side
Method, it is characterised in that the distribution power automation terminal is DTU or FTU.
3. a kind of distribution single-phase earth fault line selection based on electrical power distribution automatization system according to claim 1, positioning side
Method, it is characterised in that the distribution power automation terminal connects the main website by optical fiber or wireless communication.
4. a kind of distribution single-phase earth fault line selection based on electrical power distribution automatization system according to claim 1, positioning side
Method, it is characterised in that the 3-5 distribution power automation terminals are provided with every feeder line.
5. a kind of distribution single-phase earth fault line selection based on electrical power distribution automatization system according to claim 1, positioning side
Method, it is characterised in that in the step (4), setting the n bar feeder lines that the busbar connects respectively has, then I∑CAsk for formula
As shown in formula (I)：
IΣC=I1 Σ C of feeder line+I2 Σ C of feeder line+I3 Σ C of feeder line+...+IFeeder line i Σ C...+IFeeder line n Σ C (I)
In formula (I), IFeeder line i Σ CRepresent i-th feeder line capacitive earth current, i is integer and 1≤i≤n.
6. a kind of any distribution single-phase earth fault line selections based on electrical power distribution automatization system of claim 1-5, positioning
Method realizes system, it is characterised in that including sequentially connected specified zero-sequence current amplitude computing module, failure zero-sequence current
Amplitude computing module, difference calculating module, judgment module；
The specified zero-sequence current amplitude computing module is used to obtain each power distribution automation in each feeder line in distribution normal operation
The specified zero-sequence current amplitude of terminal；Failure zero-sequence current amplitude computing module is used for real-time telemetry and obtains each distribution in each feeder line
The failure zero-sequence current amplitude of automatization terminal；The difference calculating module is used to calculate the specified zero-sequence current amplitude in real time
The corresponding feeder line that the specified zero-sequence current amplitude that computing module obtains is obtained with the failure zero-sequence current amplitude computing module
The failure zero-sequence current amplitude difference of corresponding distribution power automation terminal；The judgment module be used for judge earth fault feeder line and
Ground area.
7. the distribution single-phase earth fault line selection according to claim 6 based on electrical power distribution automatization system, localization method
Realize system, it is characterised in that the judgment module is used to judge earth fault feeder line and ground area, including：It is poor to judge
Whether value is 0.9Between, if all distribution power automation terminal of certain feeder line is satisfied by difference and existsBetween, then the feeder line is earth fault feeder line, and two of difference mutation match somebody with somebody on earth fault feeder line
It is ground area between electric automation terminal, α is Reactive Compensation Factor, and value range is 5%~20%, I∑CIt is automatic for distribution
Change system total capacitance current over the ground；Otherwise, the feeder line is judged for non-fault line, and the specified zero-sequence current amplitude calculates mould
Block continues the specified zero-sequence current amplitude of the next distribution power automation terminal of remote measurement.
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| CN109782117A (en) * | 2019-03-29 | 2019-05-21 | 云南电网有限责任公司电力科学研究院 | A kind of ground fault disappearance method of discrimination based on controllable voltage source range-adjusting |
| CN110687389A (en) * | 2018-07-05 | 2020-01-14 | 李景禄 | Method for measuring key parameters of transfer grounding device and judging arc extinction of fault point |
| CN111781462A (en) * | 2020-06-23 | 2020-10-16 | 国网山东省电力公司聊城供电公司 | Power distribution network single-phase earth fault line selection method, system, medium and equipment |
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| CN113933744A (en) * | 2020-07-13 | 2022-01-14 | 福建先德能源科技有限公司 | Method and device for judging single-phase earth fault |
| CN114217172A (en) * | 2021-12-16 | 2022-03-22 | 国网湖北省电力有限公司孝感供电公司 | Power distribution network single-phase earth fault area judgment method based on node identification |
| CN114609468A (en) * | 2021-12-16 | 2022-06-10 | 国网湖北省电力有限公司孝感供电公司 | Power distribution network single-phase earth fault interval discrimination method based on cloud edge terminal cooperation |
| CN115764837A (en) * | 2022-10-21 | 2023-03-07 | 国网四川省电力公司电力科学研究院 | Fault line selection analysis method and device based on subnet segmentation |
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| CN108663602A (en) * | 2018-05-14 | 2018-10-16 | 山东大学 | Flexible direct current power distribution network monopole failure line selection and Section Location and system |
| CN110687389A (en) * | 2018-07-05 | 2020-01-14 | 李景禄 | Method for measuring key parameters of transfer grounding device and judging arc extinction of fault point |
| CN109782117A (en) * | 2019-03-29 | 2019-05-21 | 云南电网有限责任公司电力科学研究院 | A kind of ground fault disappearance method of discrimination based on controllable voltage source range-adjusting |
| CN111781462A (en) * | 2020-06-23 | 2020-10-16 | 国网山东省电力公司聊城供电公司 | Power distribution network single-phase earth fault line selection method, system, medium and equipment |
| CN113933744B (en) * | 2020-07-13 | 2023-11-03 | 福建先德能源科技有限公司 | Method and device for discriminating single-phase ground fault |
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| CN112485588B (en) * | 2020-11-11 | 2024-02-06 | 云南电网有限责任公司临沧供电局 | Permanent high-resistance fault section positioning method based on cascade H-bridge control |
| CN114217172A (en) * | 2021-12-16 | 2022-03-22 | 国网湖北省电力有限公司孝感供电公司 | Power distribution network single-phase earth fault area judgment method based on node identification |
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| CN114609468B (en) * | 2021-12-16 | 2023-12-05 | 国网湖北省电力有限公司孝感供电公司 | Cloud edge end cooperation-based single-phase earth fault interval distinguishing method for power distribution network |
| CN115764837A (en) * | 2022-10-21 | 2023-03-07 | 国网四川省电力公司电力科学研究院 | Fault line selection analysis method and device based on subnet segmentation |
| CN115764837B (en) * | 2022-10-21 | 2023-12-26 | 国网四川省电力公司电力科学研究院 | Fault line selection analysis method and device based on subnet segmentation |
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