CN112540322A - Line selection method, device and equipment for single-phase earth fault line of feeder line of transformer substation - Google Patents
Line selection method, device and equipment for single-phase earth fault line of feeder line of transformer substation 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
- G01R31/52—Testing for short-circuits, leakage current or ground faults
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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
- G01R31/58—Testing of lines, cables or conductors
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Abstract
The embodiment of the invention relates to a method, a device and equipment for selecting a single-phase earth fault line of a feeder line of a transformer substation, by installing the circuit breakers with zero sequence voltage protection on the base tower of all the feeder lines of the substation, according to the single-phase earth fault of the feeder line of the transformer substation, the breaker is adopted to detect the zero sequence voltage of the line corresponding to the feeder line to judge whether the breaker is tripped or not, when the breaker corresponding to the feeder line is tripped, the zero sequence voltage of the line of the feeder line is detected again, judging whether the feeder line has single-phase earth fault according to the re-detected zero sequence voltage, obtaining which feeder line of the transformer substation has single-phase earth fault, and then the line of the feeder line with the fault is cut off, and the technical problems that the small-resistance grounding device or the line selection device cannot be additionally arranged due to insufficient in-station sites of the existing transformer substation, and the fault line on the feeder line of the transformer substation cannot be judged are solved.
Description
Technical Field
The invention relates to the technical field of single-phase grounding, in particular to a method, a device and equipment for selecting a single-phase grounding fault line of a substation feeder line.
Background
The existing method for cutting off the fault line on the feeder line of the transformer substation generally comprises the steps of judging whether the feeder line is subjected to single-phase grounding tripping on the feeder line of the transformer substation, normally installing a line selection device or a small-resistance grounding device on the feeder line of the transformer substation when the feeder line is to be subjected to the single-phase grounding tripping on the feeder line of the transformer substation, but the line selection device or the small-resistance grounding device cannot be normally installed on the transformer substation due to the difficult transformation condition of part of the transformer substation, mainly comprising the steps of not installing the small-resistance grounding device on the transformer substation due to insufficient on-site, and not installing the line selection device, so that the transformer substation cannot normally realize the single-phase grounding tripping of the feeder line, judging the fault line, and.
Disclosure of Invention
The embodiment of the invention provides a method, a device and equipment for selecting a single-phase ground fault line of a feeder line of a transformer substation, which are used for solving the technical problems that a small-resistance grounding device or a line selection device cannot be additionally arranged due to insufficient in-station sites of the existing transformer substation, and a fault line on the feeder line of the transformer substation cannot be judged.
In order to achieve the above object, the embodiments of the present invention provide the following technical solutions:
a line selection method for a single-phase earth fault line of a transformer substation feeder line comprises the following steps:
s10, arranging circuit breakers with zero sequence voltage protection on base pole towers of all feeder lines of the transformer substation;
s20, if the single-phase ground fault occurs to the circuit of the feeder line in the transformer substation, carrying out zero sequence voltage detection on the circuit of the feeder line by the circuit breakers corresponding to all the feeder lines in the transformer substation;
s30, if the zero-sequence voltage detected by the circuit breaker is not less than the zero-sequence voltage threshold value, tripping the circuit breaker corresponding to the feeder line after zero-sequence voltage tripping delay;
s40, if the breaker corresponding to the feeder line detects that the zero sequence voltage of the line of the feeder line is recovered to be normal after the breaker trips, the corresponding line of the feeder line has a single-phase earth fault; and if the breaker corresponding to the feeder line detects that the zero sequence voltage of the line of the feeder line is not less than the zero sequence voltage threshold value after the breaker trips, the corresponding line of the feeder line has no single-phase earth fault.
Preferably, in step S40, if a single-phase ground fault occurs in the line of the feeder line, the reclosing of the circuit breaker corresponding to the feeder line is closed, and power supply to the line of the feeder line is stopped.
Preferably, in step S40, if no single-phase ground fault occurs in the line of the feeder line, the circuit breaker corresponding to the feeder line is reclosed, and the line power supply of the feeder line is restored.
Preferably, in step S40, if no single-phase ground fault occurs in the line of the feeder line, the circuit breaker corresponding to the feeder line is reclosed, and the line power supply of the feeder line is restored.
Preferably, in step S30, the zero sequence voltage threshold value is 800V to 1500V. Wherein the zero sequence voltage threshold value is 900V.
Preferably, in step S30, the time of the zero-sequence voltage trip delay is 5S to 10S.
The invention also provides a line selection device of the single-phase earth fault line of the feeder line of the transformer substation, which comprises a setting module, a voltage detection module, a judgment module and an execution module;
the setting module is used for setting circuit breakers with zero sequence voltage protection on base towers of all feeder lines of the transformer substation;
the voltage detection module is used for carrying out zero sequence voltage detection on the lines of the feeder lines by the circuit breakers corresponding to all the feeder lines in the transformer substation according to the single-phase earth fault of the lines of the feeder lines in the transformer substation;
the judging module is used for tripping the breaker corresponding to the feeder line after zero-sequence voltage tripping delay according to the fact that the zero-sequence voltage detected by the breaker is not less than the zero-sequence voltage threshold value;
the execution module is used for detecting that the zero sequence voltage of the line of the feeder line is recovered to be normal according to the fact that the breaker corresponding to the feeder line is tripped, and then the corresponding line of the feeder line has a single-phase earth fault; and the circuit breaker corresponding to the feeder line is also used for detecting whether the zero sequence voltage of the circuit of the feeder line is not less than the zero sequence voltage threshold value or not according to the tripping of the circuit breaker, and the corresponding circuit of the feeder line has no single-phase earth fault.
The present invention also provides a computer-readable storage medium for storing computer instructions, which when run on a computer, cause the computer to execute the above-mentioned method for selecting a single-phase ground fault line of a substation feeder line.
The invention also provides terminal equipment, which comprises a processor and a memory;
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor is used for executing the line selection method of the single-phase earth fault line of the substation feeder line according to the instruction in the program code.
According to the technical scheme, the embodiment of the invention has the following advantages: the method, the device and the equipment for selecting the single-phase earth fault line of the feeder line of the transformer substation are characterized in that circuit breakers with zero sequence voltage protection are arranged on base towers of all feeder lines of the transformer substation, according to the single-phase earth fault of the feeder line of the transformer substation, the breaker is adopted to detect the zero sequence voltage of the line corresponding to the feeder line to judge whether the breaker is tripped or not, when the breaker corresponding to the feeder line is tripped, the zero sequence voltage of the line of the feeder line is detected again, judging whether the feeder line has single-phase earth fault according to the re-detected zero sequence voltage, obtaining which feeder line of the transformer substation has single-phase earth fault, and then the line of the feeder line with the fault is cut off, and the technical problems that the small-resistance grounding device or the line selection device cannot be additionally arranged due to insufficient in-station sites of the existing transformer substation, and the fault line on the feeder line of the transformer substation cannot be judged are solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a flowchart illustrating steps of a method for selecting a single-phase ground fault line of a feeder line of a substation according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of tripping of circuit breakers of multiple feeders on a substation according to the line selection method for a single-phase ground fault line of a feeder line of the substation in the embodiment of the present invention.
Fig. 3 is a frame diagram of a line selection device for a single-phase ground fault line of a feeder line of a substation according to an embodiment of the present invention.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the embodiments described below are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the application provides a line selection method, a line selection device and line selection equipment for a single-phase ground fault line of a transformer substation feeder line.
The first embodiment is as follows:
fig. 1 is a flowchart illustrating steps of a method for selecting a single-phase ground fault line of a feeder line of a substation according to an embodiment of the present invention.
As shown in fig. 1, an embodiment of the present invention provides a line selection method for a single-phase ground fault line of a feeder line of a transformer substation, including the following steps:
s10, arranging circuit breakers with zero sequence voltage protection on base pole towers of all feeder lines of the transformer substation;
s20, if the single-phase ground fault occurs to the circuit of the feeder line in the transformer substation, carrying out zero sequence voltage detection on the circuit of the feeder line by the circuit breakers corresponding to all the feeder lines in the transformer substation;
s30, if the zero-sequence voltage detected by the circuit breaker is not less than the zero-sequence voltage threshold value, tripping the circuit breaker corresponding to the feeder line after zero-sequence voltage tripping delay;
s40, if the breaker corresponding to the feeder line detects that the zero sequence voltage of the line of the feeder line is recovered to be normal after the breaker trips, the corresponding line of the feeder line has a single-phase earth fault; and if the breaker corresponding to the feeder line detects that the zero sequence voltage of the line of the feeder line is not less than the zero sequence voltage threshold value after the breaker trips, the corresponding line of the feeder line has no single-phase earth fault.
In step S10 of the embodiment of the present invention, circuit breakers are mainly installed on the base towers corresponding to the lines of all the feeder lines in the substation. In this embodiment, a zero sequence voltage override value for tripping and a time for zero sequence voltage tripping delay are set in the circuit breaker, and the circuit breaker has functions including: firstly, can detect the zero sequence voltage on the circuit of feeder, if the zero sequence voltage who detects surpasss the zero sequence voltage threshold value, the circuit breaker starts in time, and when reaching zero sequence voltage tripping operation time delay, the circuit breaker takes place the tripping operation, cuts off corresponding circuit, and circuit cutting back shutting down circuit breaker reclosing function immediately, returns to normal until the zero sequence voltage who detects.
It should be noted that the circuit breaker is preferably a vacuum circuit breaker. The time of zero sequence voltage tripping delay is preferably selected to be 5-10 s, and the time is mainly used for avoiding transient grounding faults and improving the accuracy of fault line selection.
In step S20 of the embodiment of the present invention, the zero sequence voltage of the line of the feeder line is mainly detected by the circuit breaker on the corresponding feeder line.
In step S30 of the embodiment of the present invention, mainly, according to a single-phase ground fault occurring on a line of a certain feeder of the transformer substation, zero-sequence voltage detected by a breaker on a base tower of each feeder is compared with a zero-sequence voltage threshold, and whether the breaker trips to cut off the line of the corresponding feeder is determined, and according to different zero-sequence voltage tripping delays set for each breaker, sequential tripping of the lines of the feeders on the transformer substation is realized, and fault determination is gradually performed on the line of each feeder of the transformer substation one by one.
It should be noted that the zero sequence voltage threshold value is preferably 800V to 1500V. In this embodiment, preferably, the zero sequence voltage threshold is 900V.
In step S40 of the embodiment of the present invention, after the circuit breaker trips, the circuit breaker is used again to detect the zero sequence voltage of the line corresponding to the feeder line, and again, whether the line corresponding to the feeder line has a single-phase ground fault is determined according to whether the zero sequence voltage of the line corresponding to the feeder line is recovered to normal or not less than the zero sequence voltage threshold. In this embodiment, if a single-phase ground fault occurs in a line of a feeder line, a reclosing switch of a breaker corresponding to the feeder line is closed, and power supply to the line of the feeder line is stopped; if the single-phase earth fault does not occur in the line of the feeder line, reclosing is carried out on the breaker corresponding to the feeder line, and the line power supply of the feeder line is recovered; therefore, which line of the feeder line with the fault in the transformer substation is can be obtained, and the reclosing of the breaker is adopted to cut off the line of the feeder line with the single-phase fault.
Fig. 2 is a schematic diagram of tripping of circuit breakers of multiple feeders on a substation according to the line selection method for a single-phase ground fault line of a feeder line of the substation in the embodiment of the present invention.
As shown in fig. 2, the method for selecting a single-phase ground fault line of a feeder line of a transformer substation is described by setting 3 10kV feeder lines in the transformer substation, and because the site in the transformer substation is insufficient, a low-resistance grounding device or a line selection device cannot be additionally installed, and circuit breakers with zero-sequence voltage protection functions are additionally or alternatively installed on base towers of the 3 feeder lines. If the 3 rd feeder line has a single-phase earth fault, the corresponding 3 circuit breakers can simultaneously monitor the zero sequence voltage of the line of the feeder line and start timing. Firstly, the 1 st feeder line trips at the time of T1(T1 can be 5s), the zero sequence voltage is monitored after tripping, the zero sequence voltage is found to be out of limit, whether the 1 st feeder line has the ground fault is judged according to the zero sequence voltage detected by the breaker corresponding to the 1 st feeder line, the reclosing function of the corresponding breaker is started, and the power supply of the 1 st feeder line is restored. And the 2 nd feeder trips at time T2(T2 can be 8s), the circuit breaker detects zero sequence voltage again after tripping and finds that the zero sequence voltage is still out of limit, then the circuit of the 2 nd feeder is judged to have no ground fault, the reclosing function of the corresponding circuit breaker is started, and power supply is restored to the circuit of the 2 nd feeder. And finally, tripping the 3 rd feeder line at time T3(T3 can be 10s), detecting the zero sequence voltage of the breaker corresponding to the 3 rd feeder line after tripping, returning to normal, judging that the ground fault occurs on the 3 rd feeder line, locking the reclosing function of the corresponding breaker, and not returning power to the 3 rd feeder line, namely stopping supplying power to the 3 rd feeder line.
The line selection method of the single-phase earth fault line of the feeder line of the transformer substation, which is provided by the invention, is characterized in that the circuit breakers with zero-sequence voltage protection are arranged on the base towers of all the feeder lines of the transformer substation, according to the single-phase earth fault of the feeder line of the transformer substation, the breaker is adopted to detect the zero sequence voltage of the line corresponding to the feeder line to judge whether the breaker is tripped or not, when the breaker corresponding to the feeder line is tripped, the zero sequence voltage of the line of the feeder line is detected again, judging whether the feeder line has single-phase earth fault according to the re-detected zero sequence voltage, obtaining which feeder line of the transformer substation has single-phase earth fault, and then the line of the feeder line with the fault is cut off, and the technical problems that the small-resistance grounding device or the line selection device cannot be additionally arranged due to insufficient in-station sites of the existing transformer substation, and the fault line on the feeder line of the transformer substation cannot be judged are solved.
Example two:
fig. 3 is a frame diagram of a line selection device for a single-phase ground fault line of a feeder line of a substation according to an embodiment of the present invention.
As shown in fig. 3, an embodiment of the present invention further provides a line selection device for a single-phase ground fault line of a feeder line of a transformer substation, including a setting module 10, a voltage detection module 20, a determination module 30, and an execution module 40;
the setting module 10 is used for setting circuit breakers with zero sequence voltage protection on base towers of all feeder lines of a transformer substation;
the voltage detection module 20 is configured to perform zero sequence voltage detection on the lines of the feeder lines by using circuit breakers corresponding to all feeder lines in the substation according to the single-phase ground fault occurring on the lines of the feeder lines in the substation;
the judging module 30 is used for tripping the breaker corresponding to the feeder line after zero-sequence voltage tripping delay according to the fact that the zero-sequence voltage detected by the breaker is not less than the zero-sequence voltage threshold value;
the execution module 40 is configured to detect that the zero sequence voltage of the line of the feeder line is recovered to be normal according to the trip of the circuit breaker, and then generate a single-phase ground fault on the line of the corresponding feeder line; and the circuit breaker corresponding to the feeder line is also used for detecting whether the zero sequence voltage of the circuit of the feeder line is not less than the zero sequence voltage threshold value or not according to the tripping of the circuit breaker, and the corresponding circuit of the feeder line has no single-phase earth fault.
It should be noted that the modules in the second embodiment correspond to the steps in the first embodiment, and the steps in the first embodiment have been described in detail in the first embodiment, and the contents of the modules in the second embodiment are not described in detail in this second embodiment.
Example three:
the embodiment of the invention provides a computer-readable storage medium, which is used for storing computer instructions, and when the computer instructions are run on a computer, the computer is enabled to execute the line selection method for the single-phase earth fault line of the feeder line of the transformer substation.
Example four:
the embodiment of the invention provides terminal equipment, which comprises a processor and a memory;
a memory for storing the program code and transmitting the program code to the processor;
and the processor is used for executing the line selection method of the single-phase earth fault line of the substation feeder line according to the instructions in the program codes.
It should be noted that the processor is configured to execute the steps in the above-described embodiment of the line selection method for the substation feeder single-phase ground fault line according to the instructions in the program code. Alternatively, the processor, when executing the computer program, implements the functions of each module/unit in each system/apparatus embodiment described above.
Illustratively, a computer program may be partitioned into one or more modules/units, which are stored in a memory and executed by a processor to accomplish the present application. One or more modules/units may be a series of computer program instruction segments capable of performing specific functions, which are used to describe the execution of a computer program in a terminal device.
The terminal device may be a desktop computer, a notebook, a palm computer, a cloud server, or other computing devices. The terminal device may include, but is not limited to, a processor, a memory. Those skilled in the art will appreciate that the terminal device is not limited and may include more or fewer components than those shown, or some components may be combined, or different components, e.g., the terminal device may also include input output devices, network access devices, buses, etc.
The Processor may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic, discrete hardware components, etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The storage may be an internal storage unit of the terminal device, such as a hard disk or a memory of the terminal device. The memory may also be an external storage device of the terminal device, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), and the like provided on the terminal device. Further, the memory may also include both an internal storage unit of the terminal device and an external storage device. The memory is used for storing computer programs and other programs and data required by the terminal device. The memory may also be used to temporarily store data that has been output or is to be output.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A line selection method for a single-phase earth fault line of a transformer substation feeder line is characterized by comprising the following steps:
s10, arranging circuit breakers with zero sequence voltage protection on base pole towers of all feeder lines of the transformer substation;
s20, if the single-phase ground fault occurs to the circuit of the feeder line in the transformer substation, carrying out zero sequence voltage detection on the circuit of the feeder line by the circuit breakers corresponding to all the feeder lines in the transformer substation;
s30, if the zero-sequence voltage detected by the circuit breaker is not less than the zero-sequence voltage threshold value, tripping the circuit breaker corresponding to the feeder line after zero-sequence voltage tripping delay;
s40, if the breaker corresponding to the feeder line detects that the zero sequence voltage of the line of the feeder line is recovered to be normal after the breaker trips, the corresponding line of the feeder line has a single-phase earth fault; and if the breaker corresponding to the feeder line detects that the zero sequence voltage of the line of the feeder line is not less than the zero sequence voltage threshold value after the breaker trips, the corresponding line of the feeder line has no single-phase earth fault.
2. The method for selecting the line of the single-phase ground fault line of the substation feeder line according to claim 1, wherein in step S40, if the single-phase ground fault occurs in the line of the feeder line, a reclosing switch of a breaker corresponding to the feeder line is closed, and power supply to the line of the feeder line is stopped.
3. The method according to claim 1, wherein in step S40, if no single-phase ground fault occurs in the feeder line, the circuit breaker of the corresponding feeder line is reclosed to recover the line power supply of the feeder line.
4. The method of claim 1, wherein in step S10, the circuit breaker is a vacuum circuit breaker.
5. The line selection method of the substation feeder line single-phase ground fault line according to claim 1, wherein in step S30, the zero sequence voltage threshold value is 800V-1500V.
6. The substation feeder line single-phase ground fault line selection method according to claim 5, wherein the zero sequence voltage threshold value is 900V.
7. The method for selecting the substation feeder line single-phase ground fault line according to claim 1, wherein in step S30, the time of the zero-sequence voltage trip delay is 5S-10S.
8. The line selection device for the single-phase earth fault line of the feeder line of the transformer substation is characterized by comprising a setting module, a voltage detection module, a judgment module and an execution module;
the setting module is used for setting circuit breakers with zero sequence voltage protection on base towers of all feeder lines of the transformer substation;
the voltage detection module is used for carrying out zero sequence voltage detection on the lines of the feeder lines by the circuit breakers corresponding to all the feeder lines in the transformer substation according to the single-phase earth fault of the lines of the feeder lines in the transformer substation;
the judging module is used for tripping the breaker corresponding to the feeder line after zero-sequence voltage tripping delay according to the fact that the zero-sequence voltage detected by the breaker is not less than the zero-sequence voltage threshold value;
the execution module is used for detecting that the zero sequence voltage of the line of the feeder line is recovered to be normal according to the fact that the breaker corresponding to the feeder line is tripped, and then the corresponding line of the feeder line has a single-phase earth fault; and the circuit breaker corresponding to the feeder line is also used for detecting whether the zero sequence voltage of the circuit of the feeder line is not less than the zero sequence voltage threshold value or not according to the tripping of the circuit breaker, and the corresponding circuit of the feeder line has no single-phase earth fault.
9. A computer-readable storage medium for storing computer instructions which, when run on a computer, cause the computer to perform the method of selecting a substation feeder single-phase ground fault line according to any one of claims 1 to 7.
10. A terminal device comprising a processor and a memory;
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor is configured to execute the line selection method of the substation feeder single-phase ground fault line according to any one of claims 1 to 7 according to instructions in the program code.
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| CN202011598906.XA CN112540322A (en) | 2020-12-29 | 2020-12-29 | Line selection method, device and equipment for single-phase earth fault line of feeder line of transformer substation |
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Citations (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1195874A2 (en) * | 2000-09-22 | 2002-04-10 | ABB Substation Automation Oy | Method for identification of a faulting or faulted sending end or feeder branch in an electrical distribution system |
| WO2005038474A1 (en) * | 2003-10-22 | 2005-04-28 | Abb Oy | Method and apparatus for identifying intermittent earth fault |
| CN103384062A (en) * | 2013-07-10 | 2013-11-06 | 珠海许继芝电网自动化有限公司 | Isolation control system of grid power distribution fault detection |
| CN204422692U (en) * | 2015-02-27 | 2015-06-24 | 国网福建晋江市供电有限公司 | A kind of small current grounding failure wire selection system |
| CN105703342A (en) * | 2016-01-27 | 2016-06-22 | 刘冰 | A distribution network fault intelligent identification method |
| CN106329500A (en) * | 2016-10-27 | 2017-01-11 | 珠海许继电气有限公司 | Method for treatment on distribution wire fault |
| CN106786473A (en) * | 2016-12-23 | 2017-05-31 | 广东电网有限责任公司珠海供电局 | A kind of arc suppression coil earthing system distribution line single-phase earth fault isolation method |
| CN107561404A (en) * | 2016-06-30 | 2018-01-09 | 中国电力科学研究院 | A kind of voltage selection method of resonant earthed system |
| CN109061378A (en) * | 2018-06-09 | 2018-12-21 | 广西电网有限责任公司电力科学研究院 | Small current neutral grounding system ground fault checks method |
| CN109245059A (en) * | 2018-08-31 | 2019-01-18 | 南京南瑞继保电气有限公司 | A kind of micro-capacitance sensor protection for feed line method and device |
| CN109596931A (en) * | 2017-09-30 | 2019-04-09 | 西门子（中国）有限公司 | The fault-line selecting method of system with non effectively earth ed neutral |
| CN109669095A (en) * | 2019-01-21 | 2019-04-23 | 济南大学 | A kind of isolated neutral system fault line selection method for single-phase-to-ground fault |
| CN110190591A (en) * | 2019-07-05 | 2019-08-30 | 国网陕西省电力公司电力科学研究院 | A kind of singlephase earth fault automatic processing method and processing system |
| CN110568316A (en) * | 2019-10-16 | 2019-12-13 | 国网四川省电力公司绵阳供电公司 | Method for quickly selecting line of ground fault of low-current grounding system |
| CN111146755A (en) * | 2019-12-31 | 2020-05-12 | 石家庄高景软件科技有限公司 | Feeder terminal and line protection device |
| CN111596170A (en) * | 2020-05-27 | 2020-08-28 | 国网上海市电力公司 | Fault diagnosis comprehensive positioning method for intelligent distribution network |
| CN111781465A (en) * | 2020-06-28 | 2020-10-16 | 云南电网有限责任公司电力科学研究院 | Fault positioning system and method for ungrounded power grid |
| CN212060532U (en) * | 2020-01-14 | 2020-12-01 | 浙江上青元电力科技有限公司 | Self-recovery system for single-phase earth fault of power transmission line |
| CN112098885A (en) * | 2020-07-23 | 2020-12-18 | 北京智芯微电子科技有限公司 | Distribution line fault identification system and identification method |
-
2020
- 2020-12-29 CN CN202011598906.XA patent/CN112540322A/en active Pending
Patent Citations (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1195874A2 (en) * | 2000-09-22 | 2002-04-10 | ABB Substation Automation Oy | Method for identification of a faulting or faulted sending end or feeder branch in an electrical distribution system |
| WO2005038474A1 (en) * | 2003-10-22 | 2005-04-28 | Abb Oy | Method and apparatus for identifying intermittent earth fault |
| CN103384062A (en) * | 2013-07-10 | 2013-11-06 | 珠海许继芝电网自动化有限公司 | Isolation control system of grid power distribution fault detection |
| CN204422692U (en) * | 2015-02-27 | 2015-06-24 | 国网福建晋江市供电有限公司 | A kind of small current grounding failure wire selection system |
| CN105703342A (en) * | 2016-01-27 | 2016-06-22 | 刘冰 | A distribution network fault intelligent identification method |
| CN107561404A (en) * | 2016-06-30 | 2018-01-09 | 中国电力科学研究院 | A kind of voltage selection method of resonant earthed system |
| CN106329500A (en) * | 2016-10-27 | 2017-01-11 | 珠海许继电气有限公司 | Method for treatment on distribution wire fault |
| CN106786473A (en) * | 2016-12-23 | 2017-05-31 | 广东电网有限责任公司珠海供电局 | A kind of arc suppression coil earthing system distribution line single-phase earth fault isolation method |
| CN109596931A (en) * | 2017-09-30 | 2019-04-09 | 西门子（中国）有限公司 | The fault-line selecting method of system with non effectively earth ed neutral |
| CN109061378A (en) * | 2018-06-09 | 2018-12-21 | 广西电网有限责任公司电力科学研究院 | Small current neutral grounding system ground fault checks method |
| CN109245059A (en) * | 2018-08-31 | 2019-01-18 | 南京南瑞继保电气有限公司 | A kind of micro-capacitance sensor protection for feed line method and device |
| CN109669095A (en) * | 2019-01-21 | 2019-04-23 | 济南大学 | A kind of isolated neutral system fault line selection method for single-phase-to-ground fault |
| CN110190591A (en) * | 2019-07-05 | 2019-08-30 | 国网陕西省电力公司电力科学研究院 | A kind of singlephase earth fault automatic processing method and processing system |
| CN110568316A (en) * | 2019-10-16 | 2019-12-13 | 国网四川省电力公司绵阳供电公司 | Method for quickly selecting line of ground fault of low-current grounding system |
| CN111146755A (en) * | 2019-12-31 | 2020-05-12 | 石家庄高景软件科技有限公司 | Feeder terminal and line protection device |
| CN212060532U (en) * | 2020-01-14 | 2020-12-01 | 浙江上青元电力科技有限公司 | Self-recovery system for single-phase earth fault of power transmission line |
| CN111596170A (en) * | 2020-05-27 | 2020-08-28 | 国网上海市电力公司 | Fault diagnosis comprehensive positioning method for intelligent distribution network |
| CN111781465A (en) * | 2020-06-28 | 2020-10-16 | 云南电网有限责任公司电力科学研究院 | Fault positioning system and method for ungrounded power grid |
| CN112098885A (en) * | 2020-07-23 | 2020-12-18 | 北京智芯微电子科技有限公司 | Distribution line fault identification system and identification method |
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