CN111487505B - Distribution line single-phase earth fault demarcation method, system, terminal and storage medium - Google Patents
Distribution line single-phase earth fault demarcation method, system, terminal and storage medium Download PDFInfo
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- G—PHYSICS
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- 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
- G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
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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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
Abstract
The invention provides a distribution line single-phase earth fault demarcation method, a distribution line single-phase earth fault demarcation system, a distribution line single-phase earth fault demarcation terminal and a distribution line single-phase earth fault demarcation storage medium, wherein the distribution line single-phase earth fault demarcation method comprises the following steps: transient zero-sequence voltage and transient zero-sequence current of the demarcation switch in transient one-cycle time after the fault are collected; calculating transient reactive power according to the transient zero-sequence voltage and the transient zero-sequence current by using a Hilbert transform method; calculating apparent power according to the transient zero-sequence voltage and the transient zero-sequence current; calculating a transient power factor angle according to the transient reactive power and the apparent power; and judging whether the transient power factor angle is in a positive action area, if so, judging that the demarcation switch is out of the fault. The invention adopts the modulus component transient signal after the fault, has large signal amplitude, convenient measurement, difficult interference by measurement error and high sensitivity. The conditions that fault signals are weak and the boundary result is wrong due to the action of the arc suppression coil when fault boundary is conducted based on steady-state signals are basically eliminated, and the reliability of boundary can be guaranteed.
Description
Technical Field
The invention belongs to the technical field of power distribution repair and repair, and particularly relates to a distribution line single-phase earth fault demarcation method, a distribution line single-phase earth fault demarcation system, a distribution line single-phase earth fault demarcation terminal and a distribution line single-phase earth fault demarcation storage medium.
Background
Distribution lines trouble is the leading cause that causes the user to have a power failure, in order to reduce single-phase earth fault's power failure region, simultaneously quick troubleshooting improves the reliability of power supply, needs to carry out isolation nearby and quick location to the trouble. The isolation and the location of the single-phase earth fault of the existing resonance earth system usually give an alarm or trip out after a fault line is selected for a substation master station line selection device, then a fault point is determined in a manual inspection mode, but for a longer line, the power failure range and the fault inspection workload are larger, the speed of increasing the fault inspection workload and difficulty is often larger than the speed of increasing the line length, the isolation of the single-phase earth fault nearby is realized through a fault boundary technology, the inspection guidance range is given, and the power failure range and the workload can be greatly reduced.
Therefore, the ground fault demarcation technology of the distribution line has important significance for quickly eliminating faults, but because the distribution line is complex and the distance measurement difficulty is high, research on the single-phase ground fault demarcation technology of the resonance grounding system in practical engineering is relatively less, and further improvement is needed.
The invention discloses a transient power factor angle-based single-phase earth fault demarcation method for a resonance grounding system.
Disclosure of Invention
In view of the above-mentioned deficiencies of the prior art, the present invention provides a method, a system, a terminal and a storage medium for dividing a single-phase ground fault of a distribution line, so as to solve the above-mentioned technical problems.
In a first aspect, the present invention provides a single-phase ground fault demarcation method for a distribution line, including:
transient zero-sequence voltage and transient zero-sequence current of the demarcation switch in transient one-cycle time after the fault are collected;
calculating transient reactive power according to the transient zero-sequence voltage and the transient zero-sequence current by using a Hilbert transform method;
calculating apparent power according to the transient zero-sequence voltage and the transient zero-sequence current;
calculating a transient power factor angle according to the transient reactive power and the apparent power;
and judging whether the transient power factor angle is in a positive action area, if so, judging that the demarcation switch is out of the fault.
Further, the acquiring the transient zero-sequence voltage and the transient zero-sequence current of the demarcation switch in the transient one-cycle time after the fault includes:
setting the number of sampling points in one cycle time;
uniformly generating sampling time points within a period of time according to the number of the sampling points;
and acquiring transient zero-sequence voltage and transient zero-sequence current at a sampling time point.
Further, the calculating the transient reactive power according to the transient zero-sequence voltage and the transient zero-sequence current by using the hilbert transform method includes:
calculating the product of the transient zero-sequence current and the Hilbert transform of the transient zero-sequence voltage at each sampling time point;
and calculating the average value of the accumulated sum of the products of the transient zero-sequence current and the Hilbert transform of the transient zero-sequence voltage at all sampling time points, and outputting the average value as the transient reactive power.
Further, the calculating the apparent power according to the transient zero-sequence voltage and the transient zero-sequence current includes:
calculating the average transient zero-sequence voltage square sum of all sampling time points, wherein the average transient zero-sequence voltage square sum is the average value of all transient zero-sequence voltage square sums;
calculating the average transient zero-sequence current square sum of all sampling time points, wherein the average transient zero-sequence current square sum is the average value of all transient zero-sequence current square sums;
and squaring the product of the average transient zero-sequence voltage square sum and the average transient zero-sequence current square sum to obtain the apparent power value.
Further, the calculating a transient power factor angle according to the transient reactive power and the apparent power includes:
calculating a quotient value of the transient reactive power and the apparent power;
and calculating an arcsine function value of the quotient value to obtain the transient power factor angle.
Further, the method further comprises:
collecting boundary states of a plurality of adjacent boundary switches, wherein the boundary states comprise a fault boundary and a fault boundary;
and screening out two adjacent boundary switches with inconsistent boundary states, and taking a line between the two adjacent boundary switches as a fault line.
In a second aspect, the present invention provides a single-phase ground fault demarcation system for a distribution line, comprising:
the parameter acquisition unit is configured for acquiring transient zero-sequence voltage and transient zero-sequence current of the demarcation switch in transient one-cycle time after a fault;
a reactive power calculation unit configured to calculate a transient reactive power according to the transient zero-sequence voltage and the transient zero-sequence current by using a hilbert transform method;
an apparent computing unit configured to compute an apparent power according to the transient zero-sequence voltage and the transient zero-sequence current;
a factor calculation unit configured to calculate a transient power factor angle from the transient reactive power and an apparent power;
and the factor judging unit is configured to judge whether the transient power factor angle is in a positive action area, and if so, judge that the demarcation switch is out of the fault boundary.
Further, the parameter acquisition unit includes:
the point number setting module is configured for setting the number of sampling points in one cycle time;
the generation module is used for uniformly generating sampling time points within a period of time according to the number of the sampling points;
and the acquisition execution module is configured for acquiring the transient zero-sequence voltage and the transient zero-sequence current at the sampling time point.
Further, the factor calculation unit includes:
the quotient value calculating module is configured for calculating a quotient value of the transient reactive power and the apparent power;
and the function calculation module is configured to calculate an arcsine function value of the quotient value to obtain the transient power factor angle.
In a third aspect, a terminal is provided, including:
a processor, a memory, wherein,
the memory is used for storing a computer program which,
the processor is used for calling and running the computer program from the memory so as to make the terminal execute the method of the terminal.
In a fourth aspect, a computer storage medium is provided having stored therein instructions that, when executed on a computer, cause the computer to perform the method of the above aspects.
The beneficial effect of the invention is that,
according to the distribution line single-phase earth fault demarcation method, the distribution line demarcation system, the distribution line single-phase earth fault demarcation terminal and the storage medium, transient zero-sequence voltage and transient zero-sequence current at the current switch position are collected and processed by the distribution line demarcation switch and the feeder line terminal unit, transient reactive power and transient apparent power are calculated, a transient power factor angle is further obtained, and the switch position can be judged to be in a fault boundary or out of a fault boundary according to whether the power factor angle is in an action region or not. The invention adopts the modulus component transient signal after the fault, has large signal amplitude, convenient measurement, difficult interference by measurement error and high sensitivity. The conditions that fault signals are weak and the boundary result is wrong due to the action of the arc suppression coil when fault boundary is conducted based on steady-state signals are basically eliminated, and the reliability of boundary can be guaranteed. Whether the transient power factor angle is located in the action area or not is adopted to judge whether the ground fault is located in the boundary or out of the boundary, and compared with the traditional judgment mode that the reactive power is directly adopted to be positive and negative, the reliability is higher. The signal acquisition adopts traditional power frequency sensor can, need not to add extra primary equipment, also need not other primary equipment and cooperates, and practical application is worth highly.
In addition, the invention has reliable design principle, simple structure and very wide application prospect.
Drawings
In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present invention, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
FIG. 1 is a schematic flow diagram of a method of one embodiment of the invention.
FIG. 2 is a schematic flow diagram of a method of one embodiment of the invention.
Fig. 3 is a device location diagram of a method of one embodiment of the invention.
FIG. 4 illustrates a demarcation switch actuation area of a method in accordance with one embodiment of the present invention.
FIG. 5 is a schematic block diagram of a system of one embodiment of the present invention.
Fig. 6 is a schematic structural diagram of a terminal according to an embodiment of the present invention.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not all 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.
FIG. 1 is a schematic flow diagram of a method of one embodiment of the invention. The implementation subject of fig. 1 may be a distribution line single-phase ground fault demarcation system.
As shown in fig. 1, the method 100 includes:
and 150, judging whether the transient power factor angle is in a positive action area, and if so, judging that the demarcation switch is out of the fault boundary.
In order to facilitate understanding of the present invention, the single-phase ground fault demarcation method for the distribution line provided by the present invention is further described below by using the principle of the single-phase ground fault demarcation method for the distribution line of the present invention and combining the process of demarcating the single-phase ground fault of the distribution line in the embodiment.
Referring to fig. 2 and fig. 3, in particular, the method for single-phase ground fault demarcation of the distribution line includes:
and S1, acquiring transient zero-sequence voltage and transient zero-sequence current of the demarcation switch in transient one-cycle time after the fault.
Setting the number of sampling points in one cycle time T as N, then setting the sampling interval time as T/N, uniformly generating sampling time points in one cycle time according to the number of the sampling points, and setting the interval time between adjacent sampling time points as T/N. Transient zero sequence voltage u of sampling time point is gatheredtra,j(t) and transient zero sequence current itra,j(t)。
And S2, calculating the transient reactive power according to the transient zero-sequence voltage and the transient zero-sequence current by using a Hilbert transform method.
Calculating transient reactive power QtraThe formula is as follows:
the transient zero-sequence voltage at a certain sampling time point and the transient zero-sequence current at a certain sampling time point are respectively obtained, N is the number of sampling points, and j is 1,2, … and N.
And S3, calculating the apparent power according to the transient zero-sequence voltage and the transient zero-sequence current.
The data in the transient time after the fault calculates the apparent power, and the formula is as follows:
the transient zero-sequence voltage at a certain sampling time point and the transient zero-sequence current at a certain sampling time point are respectively obtained, N is the number of sampling points, and j is 1,2, … and N.
And S4, calculating a transient power factor angle according to the transient reactive power and the apparent power.
Calculating a transient power factor angle
The formula is as follows:
and S5, judging whether the transient power factor angle is in a positive action area, and if so, judging that the demarcation switch is out of the fault boundary.
The embodiment judges the fault boundary by calculating the power factor angles of three adjacent boundary switches. Calculating the transient power factor angle at the corresponding demarcation switch YS1
YS2 transient power factor angle
And the transient power factor angle at the boundary switch YS3
The power grid supervision personnel set as required
And
the value of the angle of (a) is,
and
in order to be a positive action interval,
to
In the negative motion interval, if the transient power factor angle calculated at YS1, YS2 and YS3 in S4
If the fault is in the positive action zone range, the corresponding position is judged to be out of bounds, and if the fault is in the negative action zone range, the corresponding position is judged to be in bounds. When the boundary states of two adjacent boundary switches are inconsistent, for example, YS1 is outside the fault boundary, YS2 is inside the fault boundary, and YS3 is outside the fault boundary, the line related to YS2 needs to be checked, and the section is the fault section. Thus, the fault position can be accurately positioned.
As shown in fig. 5, the system 500 includes:
a parameter collecting unit 510 configured to collect a transient zero-sequence voltage and a transient zero-sequence current of the demarcation switch within a transient one-cycle time after a fault;
a reactive power calculation unit 520 configured to calculate a transient reactive power from the transient zero-sequence voltage and the transient zero-sequence current using a hilbert transform method;
an apparent computing unit 530 configured to compute an apparent power according to the transient zero-sequence voltage and the transient zero-sequence current;
a factor calculation unit 540 configured to calculate a transient power factor angle from the transient reactive power and an apparent power;
and a factor determination unit 550 configured to determine whether the transient power factor angle is in a positive operation region, and if so, determine that the boundary switch is outside a fault boundary.
Optionally, as an embodiment of the present invention, the parameter acquiring unit includes:
the point number setting module is configured for setting the number of sampling points in one cycle time;
the generation module is used for uniformly generating sampling time points within a period of time according to the number of the sampling points;
and the acquisition execution module is configured for acquiring the transient zero-sequence voltage and the transient zero-sequence current at the sampling time point.
Optionally, as an embodiment of the present invention, the factor calculating unit includes:
the quotient value calculating module is configured for calculating a quotient value of the transient reactive power and the apparent power;
and the function calculation module is configured to calculate an arcsine function value of the quotient value to obtain the transient power factor angle.
Fig. 6 is a schematic structural diagram of an end system 600 according to an embodiment of the present invention, where the end system 600 may be used to execute the distribution line single-phase ground fault demarcation method according to the embodiment of the present invention.
The terminal system 600 may include: a processor 610, a memory 620, and a communication unit 630. The components communicate via one or more buses, and those skilled in the art will appreciate that the architecture of the servers shown in the figures is not intended to be limiting, and may be a bus architecture, a star architecture, a combination of more or less components than those shown, or a different arrangement of components.
The memory 620 may be used for storing instructions executed by the processor 610, and the memory 620 may be implemented by any type of volatile or non-volatile storage terminal or combination thereof, such as Static Random Access Memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic disk or optical disk. The executable instructions in memory 620, when executed by processor 610, enable terminal 600 to perform some or all of the steps in the method embodiments described below.
The processor 610 is a control center of the storage terminal, connects various parts of the entire electronic terminal using various interfaces and lines, and performs various functions of the electronic terminal and/or processes data by operating or executing software programs and/or modules stored in the memory 620 and calling data stored in the memory. The processor may be composed of an Integrated Circuit (IC), for example, a single packaged IC, or a plurality of packaged ICs connected with the same or different functions. For example, the processor 610 may include only a Central Processing Unit (CPU). In the embodiment of the present invention, the CPU may be a single operation core, or may include multiple operation cores.
A communication unit 630, configured to establish a communication channel so that the storage terminal can communicate with other terminals. And receiving user data sent by other terminals or sending the user data to other terminals.
The present invention also provides a computer storage medium, wherein the computer storage medium may store a program, and the program may include some or all of the steps in the embodiments provided by the present invention when executed. The storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM) or a Random Access Memory (RAM).
Therefore, the transient state zero sequence voltage and the transient state zero sequence current at the current switch position are collected and processed by the distribution line boundary switch and the feeder line terminal unit, the transient state reactive power and the transient state apparent power are calculated, the transient state power factor angle is further obtained, and the switch position can be judged to be in or out of a fault boundary according to whether the power factor angle is in an action area or not. The invention adopts the modulus component transient signal after the fault, has large signal amplitude, convenient measurement, difficult interference by measurement error and high sensitivity. The conditions that fault signals are weak and the boundary result is wrong due to the action of the arc suppression coil when fault boundary is conducted based on steady-state signals are basically eliminated, and the reliability of boundary can be guaranteed. Whether the transient power factor angle is located in the action area or not is adopted to judge whether the ground fault is located in the boundary or out of the boundary, and compared with the traditional judgment mode that the reactive power is directly adopted to be positive and negative, the reliability is higher. Signal acquisition adopts traditional power frequency sensor can, need not to add extra primary equipment, also need not other primary equipment to cooperate, and practical application is worth highly, and the technological effect that this embodiment can reach can see the description in the above, and this here is no longer repeated.
Those skilled in the art will readily appreciate that the techniques of the embodiments of the present invention may be implemented as software plus a required general purpose hardware platform. Based on such understanding, the technical solutions in the embodiments of the present invention may be embodied in the form of a software product, where the computer software product is stored in a storage medium, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and the like, and the storage medium can store program codes, and includes instructions for enabling a computer terminal (which may be a personal computer, a server, or a second terminal, a network terminal, and the like) to perform all or part of the steps of the method in the embodiments of the present invention.
The same and similar parts in the various embodiments in this specification may be referred to each other. Especially, for the terminal embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant points can be referred to the description in the method embodiment.
In the embodiments provided in the present invention, it should be understood that the disclosed system and method can be implemented in other ways. For example, the above-described system embodiments are merely illustrative, and for example, the division of the units is only one logical functional 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, systems 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.
Although the present invention has been described in detail by referring to the drawings in connection with the preferred embodiments, the present invention is not limited thereto. Various equivalent modifications or substitutions can be made on the embodiments of the present invention by those skilled in the art without departing from the spirit and scope of the present invention, and these modifications or substitutions are within the scope of the present invention/any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A single-phase earth fault demarcation method for a distribution line is characterized by comprising the following steps:
transient zero-sequence voltage and transient zero-sequence current of the demarcation switch in transient one-cycle time after the fault are collected;
calculating transient reactive power according to the transient zero-sequence voltage and the transient zero-sequence current by using a Hilbert transform method;
calculating apparent power according to the transient zero-sequence voltage and the transient zero-sequence current;
calculating a transient power factor angle according to the transient reactive power and the apparent power;
and judging whether the transient power factor angle is in a positive action area, if so, judging that the demarcation switch is out of the fault.
2. The method of claim 1, wherein the collecting transient zero-sequence voltages and transient zero-sequence currents of the demarcation switch during a transient one-cycle time after the fault comprises:
setting the number of sampling points in one cycle time;
uniformly generating sampling time points within a period of time according to the number of the sampling points;
and acquiring transient zero-sequence voltage and transient zero-sequence current at a sampling time point.
3. The method of claim 2, wherein calculating the transient reactive power from the transient zero-sequence voltage and the transient zero-sequence current using a hilbert transform method comprises:
calculating the product of the transient zero-sequence current and the Hilbert transform of the transient zero-sequence voltage at each sampling time point;
and calculating the average value of the accumulated sum of the products of the transient zero-sequence current and the Hilbert transform of the transient zero-sequence voltage at all sampling time points, and outputting the average value as the transient reactive power.
4. The method of claim 2, wherein calculating apparent power from the transient zero-sequence voltage and the transient zero-sequence current comprises:
calculating the average transient zero-sequence voltage square sum of all sampling time points, wherein the average transient zero-sequence voltage square sum is the average value of all transient zero-sequence voltage square sums;
calculating the average transient zero-sequence current square sum of all sampling time points, wherein the average transient zero-sequence current square sum is the average value of all transient zero-sequence current square sums;
and squaring the product of the average transient zero-sequence voltage square sum and the average transient zero-sequence current square sum to obtain the apparent power value.
5. The method of claim 1, wherein calculating a transient power factor angle from the transient reactive power and an apparent power comprises:
calculating a quotient value of the transient reactive power and the apparent power;
and calculating an arcsine function value of the quotient value to obtain the transient power factor angle.
6. The method of claim 1, further comprising:
collecting boundary states of a plurality of adjacent boundary switches, wherein the boundary states comprise a fault boundary and a fault boundary;
and screening out two adjacent boundary switches with inconsistent boundary states, and taking a line between the two adjacent boundary switches as a fault line.
7. A distribution line single-phase ground fault demarcation system, comprising:
the parameter acquisition unit is configured for acquiring transient zero-sequence voltage and transient zero-sequence current of the demarcation switch in transient one-cycle time after a fault;
a reactive power calculation unit configured to calculate a transient reactive power according to the transient zero-sequence voltage and the transient zero-sequence current by using a hilbert transform method;
an apparent computing unit configured to compute an apparent power according to the transient zero-sequence voltage and the transient zero-sequence current;
a factor calculation unit configured to calculate a transient power factor angle from the transient reactive power and an apparent power;
and the factor judging unit is configured to judge whether the transient power factor angle is in a positive action area, and if so, judge that the demarcation switch is out of the fault boundary.
8. The system of claim 7, wherein the parameter acquisition unit comprises:
the point number setting module is configured for setting the number of sampling points in one cycle time;
the generation module is used for uniformly generating sampling time points within a period of time according to the number of the sampling points;
and the acquisition execution module is configured for acquiring the transient zero-sequence voltage and the transient zero-sequence current at the sampling time point.
9. A terminal, comprising:
a processor;
a memory for storing instructions for execution by the processor;
wherein the processor is configured to perform the method of any one of claims 1-6.
10. A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out the method according to any one of claims 1-6.
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| CN112763854A (en) * | 2020-12-29 | 2021-05-07 | 山东科汇电力自动化股份有限公司 | Grounding fault direction judgment method based on low-frequency transient power factor |
| CN115840110B (en) * | 2023-02-13 | 2023-05-02 | 国网湖北省电力有限公司武汉供电公司 | Sensitive sensing method, system and storage medium for single-phase ground fault |
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