CN112485716B - Line selection method based on zero-rest transient characteristic signal of ground fault arc current - Google Patents
Line selection method based on zero-rest transient characteristic signal of ground fault arc current Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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- G—PHYSICS
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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
- G01R31/50—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 application provides a line selection method based on a zero-rest transient characteristic signal of an earth fault arc current, which monitors the high-frequency signal amplitude of three-phase voltage and the high-frequency signal amplitude of zero-sequence voltage in real time; judging whether the power system has single-phase earth fault according to the single-phase earth fault condition; if single-phase earth fault occurs, judging an earth fault phase according to earth fault phase conditions; determining a first line selection detection section and a second line selection detection section; calculating a zero sequence transient state polarity characteristic value of each line; in the second line selection detection section, if the zero sequence transient state polarity characteristic value of only one line is positive, the line is judged to be a suspected fault line; and if the suspected fault lines judged by 2-5 continuous second line selection detection sections are the same line, judging the line as a fault line, and otherwise, judging that the bus is grounded. The problem that a high-resistance grounding fault is difficult to distinguish by a traditional method is solved, and the line selection accuracy rate when line selection is carried out by currently adopting power frequency voltage and power frequency current can be improved.
Description
Technical Field
The application relates to the technical field of fault diagnosis, in particular to a line selection method based on a zero-break transient characteristic signal of arc current of a ground fault.
Background
The distribution network in China widely adopts a neutral point non-effective grounding mode, and the neutral point non-effective grounding mode effectively improves the reliability of power supply. However, when a single-phase earth fault occurs, the line selection problem always exists due to the reasons of weak fault current characteristics, unstable electric arc and the like.
Application number CN202010220325.6 discloses a power distribution network single-phase earth fault line selection method based on a gradient lifting tree algorithm, which is characterized in that data processing is performed on a zero-sequence current sampling value of a line after a fault to obtain zero-sequence current sampling value data after normalization of each line, then the current data of each line are respectively used as the input of a gradient lifting tree model, the line corresponding to the maximum output value of the gradient lifting tree model is selected as a fault line, and line selection is finally realized. The method utilizes power frequency zero sequence current to select the line, but when the zero sequence current contains stronger direct current components, the problem of line selection failure is easily caused by waveform distortion caused by current transformer saturation.
Application number CN201910840780.3 discloses a small-current ground fault line selection method, which adopts wavelet packet transformation and fourier transformation to extract characteristic parameters of zero-sequence current signals, optimizes a support vector machine model by using a fuzzy self-correction algorithm, performs multi-criterion fusion, and completes ground fault line selection. However, the method uses wavelet analysis to select lines, has certain applicability, but is easily influenced by factors such as wavelet basis functions, decomposition scales and the like.
The document, "research of arc single-phase grounding protection method for feed switch" proposes a new arc grounding protection method for feed switch based on the integral of the first half-wave of the steady-state zero-sequence voltage and the transient zero-sequence current.
The line selection method mainly comprises a steady-state signal method, an injection method and a transient signal method. The main difficulty of the steady-state signal method is that the fault current is weak and is easily influenced by arc instability, so that the measured signal reliability is not high and misjudgment is easily caused; the manual injection method has certain effect in field application, but cannot detect instantaneous and intermittent faults, needs to add signal injection equipment and has large investment; the transient signal method is obvious in fault characteristic and is not influenced by arc suppression coils and arc instability; generally speaking, the amplitude and the phase of a transient signal are compared from different angles to determine a fault line, and misjudgment is easy to occur under the working conditions of high-resistance grounding and intermittent grounding faults.
Disclosure of Invention
The application provides a line selection method based on a zero-break transient characteristic signal of an arc current of a ground fault, which aims to solve the problem that the accuracy of line selection of a high-resistance ground fault and an intermittent ground fault is reduced.
The application provides a line selection method based on a ground fault arc current zero-break transient characteristic signal, which comprises the following steps of:
s1: acquiring high-frequency noise amplitude values of three-phase voltage, zero-sequence voltage and zero-sequence current signals;
s2: monitoring the high-frequency signal amplitude of the three-phase voltage and the high-frequency signal amplitude of the zero-sequence voltage in real time; judging whether the power system has single-phase earth fault according to the single-phase earth fault condition;
s3: if single-phase earth fault occurs, judging an earth fault phase according to earth fault phase conditions;
s4: determining a first line selection detection section, and searching the maximum value of the absolute value of the high-frequency signal of the zero-sequence current in the first line selection detection section;
s5: determining a second line selection detection section according to the maximum value of the absolute value of the high-frequency signal of the zero-sequence current, and calculating a zero-sequence transient state polarity characteristic value of each line in the second line selection detection section;
s6: in the second line selection detection section, if the zero sequence transient state polarity characteristic value of only one line is positive, the line is judged to be a suspected fault line;
s7: and if 2-5 continuous suspected faulty lines determined by the second line selection detection sections are the same line, determining that the line is a faulty line, otherwise, determining that the bus is grounded.
Optionally, the zero sequence transient polarity characteristic value calculation formula is as follows:
wherein, P n The zero sequence transient state polarity characteristic value of the nth line is obtained; t is the number of the high-frequency signal sampling values in the time period; u. u gk A k high-frequency signal value of a fault phase voltage high-frequency pulse signal in the time period; i.e. i nk And the kth high-frequency signal value of the nth line zero-sequence current high-frequency signal in the time period is obtained.
Optionally, the single-phase ground fault condition is that when the amplitude of the high-frequency signal of the three-phase voltage reaches 2 times or more of the amplitude of the high-frequency noise of the three-phase voltage, and the amplitude of the high-frequency signal of the zero-sequence voltage reaches 2 times or more of the amplitude of the high-frequency noise of the zero-sequence voltage, it may be determined that the single-phase ground fault occurs in the power system.
Optionally, the ground fault phase condition is that when any phase voltage high-frequency signal in the three-phase voltage high-frequency signals is in phase with the zero-sequence voltage high-frequency signal; the other two-phase voltage high-frequency signals have the same phase and have the phase difference with the zero-sequence voltage high-frequency signal
Within the range, one phase of the three-phase voltage high-frequency signals, which is in the same phase with the zero-sequence voltage high-frequency signals, can be judged as a ground fault phase.
Optionally, the step of determining the first line selection detection section includes:
selecting a zero-rest ending moment in the zero-sequence current as a starting moment, and selecting a moment when the power frequency current reaches a first peak value after the zero-rest moment as an end point moment;
and determining the time period as the first line selection detection section according to the starting time and the end time.
Optionally, the step of determining the second line selection detection section includes:
from the starting time of the first line selection detection section to the time of finding the maximum value of the absolute value of the zero-sequence current high-frequency signal, the zero-crossing time of the first zero-sequence current high-frequency signal is the starting time of the second line selection detection section; the time of the maximum absolute value of the high-frequency signal of the zero-sequence current is the time of the end point of the second line selection detection section;
and determining the time period as the second line selection detection section according to the starting time and the end time.
According to the technical scheme, the line selection method based on the zero-rest transient characteristic signal of the arc current of the ground fault comprises the steps of obtaining a high-frequency noise amplitude of three-phase voltage, a high-frequency noise amplitude of zero-sequence voltage and a high-frequency noise amplitude of a zero-sequence current signal; monitoring the high-frequency signal amplitude of the three-phase voltage and the high-frequency signal amplitude of the zero-sequence voltage in real time; judging whether the power system has single-phase earth fault according to the single-phase earth fault condition; if single-phase earth fault occurs, judging an earth fault phase according to earth fault phase conditions; determining a first line selection detection section, and searching the maximum value of the absolute value of the high-frequency signal of the zero-sequence current in the first line selection detection section; determining a second line selection detection section according to the maximum value of the absolute value of the high-frequency signal of the zero-sequence current, and calculating a zero-sequence transient state polarity characteristic value of each line in the second line selection detection section; if the zero sequence transient state polarity characteristic value of only one line is positive in the second line selection detection section, the line is judged to be a suspected fault line; and if 2-5 continuous suspected faulty lines determined by the second line selection detection sections are the same line, determining that the line is a faulty line, otherwise, determining that the bus is grounded. On one hand, the method solves the problem that the traditional method for judging the fault and the phase by using the power frequency voltage amplitude and the phase characteristics is difficult to judge the high-resistance grounding fault; on the other hand, the line selection accuracy rate when line selection is performed by currently adopting power frequency voltage and power frequency current can be improved. The fault distinguishing and line selecting method provided by the invention can still accurately select lines under the conditions of high-resistance ground fault, intermittent ground fault and the like.
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In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a flowchart of a line selection method based on a ground fault arc current zero-break transient characteristic signal.
Detailed Description
Reference will now be made in detail to embodiments, examples of which are illustrated in the accompanying drawings. The following description refers to the accompanying drawings in which the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following examples do not represent all embodiments consistent with the present application. But merely as examples of systems and methods consistent with certain aspects of the application, as detailed in the claims.
Referring to fig. 1, a flowchart of a line selection method based on a ground fault arc current zero-break transient characteristic signal is shown. The application provides a line selection method based on a zero-break transient characteristic signal of an arc current of a ground fault, which comprises the following steps:
when the power system normally operates, measuring and acquiring the high-frequency noise amplitude of three-phase voltage, the high-frequency noise amplitude of zero-sequence voltage and the high-frequency noise amplitude of zero-sequence current signals of the power system;
furthermore, a high-frequency voltage monitoring sensor can be used for monitoring the high-frequency signal amplitude of the three-phase voltage and the high-frequency signal amplitude of the zero-sequence voltage in real time; judging whether the power system has single-phase earth fault according to the single-phase earth fault condition; and the single-phase earth fault condition is that when the amplitude of the high-frequency signal of the three-phase voltage reaches 2 times or more of the amplitude of the high-frequency noise of the three-phase voltage, and the amplitude of the high-frequency signal of the zero-sequence voltage reaches 2 times or more of the amplitude of the high-frequency noise of the zero-sequence voltage, the single-phase earth fault of the power system can be judged.
Further, if a single-phase earth fault occurs, judging an earth fault phase according to the earth fault phase condition; the ground fault phase condition is that any phase voltage high-frequency signal in the three-phase voltage high-frequency signals is in the same phase with the zero-sequence voltage high-frequency signal; the other two-phase voltage high-frequency signals have the same phase and have the phase difference with the zero-sequence voltage high-frequency signal
Within the range, one phase of the three-phase voltage high-frequency signals, which has the same phase with the zero-sequence voltage high-frequency signals, can be judged as a ground fault phase.
Further, measuring zero sequence current in the line by using a high-frequency zero sequence current sensor; respectively selecting a zero-rest ending moment in any one zero-sequence current as a starting moment, and a moment when the power frequency current reaches a first peak value after the zero-rest moment as an end moment; and determining the time period as a first line selection detection section according to the starting time and the end time. After a first line selection detection section is determined, searching the maximum value of the absolute value of the high-frequency signal of the zero-sequence current in the first line selection detection section;
further, from the starting time of the first line selection detection section to the time when the maximum absolute value of the zero sequence current high-frequency signal is found, the zero-crossing time of the first zero sequence current high-frequency signal is the starting time of the second line selection detection section; the time of the maximum absolute value of the high-frequency signal of the zero-sequence current is the time of the end point of the second line selection detection section; and determining the time period as the second line selection detection section according to the starting time and the end time. Determining a second line selection detection section according to the maximum value of the absolute value of the high-frequency signal of the zero-sequence current, and calculating a zero-sequence transient state polarity characteristic value of each line in the second line selection detection section;
further, in the second line selection detection section, if the zero sequence transient state polarity characteristic value of only one line is positive, the line is determined to be a suspected fault line;
further, if 2-5 second line selection detection sections determine that the suspected faulty line is the same line, determining that the line is a faulty line, otherwise, determining that the bus is grounded.
Further, the zero sequence transient polarity characteristic value calculation formula is as follows:
wherein, P n Is the zero sequence transient of the nth lineA polarity eigenvalue; t is the number of the high-frequency signal sampling values in the time period; u. of gk A k-th high-frequency signal value of the fault phase voltage high-frequency pulse signal in the time period; i all right angle nk And a k high-frequency signal value of the high-frequency signal of the zero-sequence current of the nth line in the time period.
Further, voltage and current signals acquired by the high-frequency voltage monitoring sensor and the high-frequency zero-sequence current sensor can be acquired by the line selection device, and the line with the ground fault is judged according to the method provided by the application. For example, one end of the high-frequency voltage monitoring sensor is connected with three phases of a bus A, a bus B and a bus C, if n distribution lines are arranged below the buses, the zero-sequence current is i 01 、i 02 、……、i 0n The C-phase line 1 has a ground fault and the C-phase voltage is u c According to the method and the device, the line selection can be completed according to the consistency of the polarities of the high-frequency signals of the fault phase voltage and the zero sequence current after the sudden change of the zero sequence current exceeds the preset value.
The application provides a line selection method based on a zero-rest transient characteristic signal of an earth fault arc current, which comprises the steps of obtaining a high-frequency noise amplitude of a three-phase voltage, a high-frequency noise amplitude of a zero-sequence voltage and a high-frequency noise amplitude of a zero-sequence current signal; monitoring the high-frequency signal amplitude of the three-phase voltage and the high-frequency signal amplitude of the zero-sequence voltage in real time; judging whether the power system has single-phase earth fault according to the single-phase earth fault condition; if single-phase earth fault occurs, judging an earth fault phase according to earth fault phase conditions; determining a first line selection detection section, and searching the maximum value of the absolute value of the high-frequency signal of the zero-sequence current in the first line selection detection section; determining a second line selection detection section according to the maximum value of the absolute value of the high-frequency signal of the zero-sequence current, and calculating a zero-sequence transient state polarity characteristic value of each line in the second line selection detection section; in the second line selection detection section, if the zero sequence transient state polarity characteristic value of only one line is positive, the line is judged to be a suspected fault line; and if the suspected fault lines judged by 2-5 continuous second line selection detection sections are the same line, judging the line as a fault line, and otherwise, judging that the bus is grounded. On one hand, the method solves the problem that the traditional method for judging the fault and the phase by using the power frequency voltage amplitude and the phase characteristics is difficult to judge the high-resistance grounding fault; on the other hand, the line selection accuracy rate when line selection is carried out by currently adopting power frequency voltage and power frequency current can be improved. The application provides a fault judgment and line selection method for a power system, which can still accurately select lines under the conditions of high-resistance earth faults, intermittent earth faults and the like.
The embodiments provided in the present application are only a few examples of the general concept of the present application, and do not limit the scope of the present application. Any other embodiments extended according to the scheme of the present application without inventive efforts will be within the scope of protection of the present application for a person skilled in the art.
Claims (4)
1. A line selection method based on a zero-break transient characteristic signal of an arc current of a ground fault is characterized by comprising the following steps of:
s1: acquiring high-frequency noise amplitude values of three-phase voltage, zero-sequence voltage and zero-sequence current signals;
s2: monitoring the high-frequency signal amplitude of the three-phase voltage and the high-frequency signal amplitude of the zero-sequence voltage in real time; judging whether the power system has single-phase earth fault according to the single-phase earth fault condition;
s3: if single-phase earth fault occurs, judging an earth fault phase according to earth fault phase conditions;
s4: determining a first line selection detection section, and searching for the maximum absolute value of the high-frequency signal of the zero-sequence current in the first line selection detection section, wherein the step of determining the first line selection detection section is to select the zero-rest end time in the zero-sequence current as the starting time, and the time when the power frequency current reaches the first peak value after the zero-rest end time is the end point time; determining the time period as the first line selection detection section according to the starting time and the end time;
s5: determining a second line selection detection section according to the maximum value of the absolute value of the high-frequency signal of the zero-sequence current, and calculating a zero-sequence transient state polarity characteristic value of each line in the second line selection detection section, wherein the step of determining the second line selection detection section comprises the steps of selecting the starting moment of the first line selection detection section to the moment of finding out the maximum value of the absolute value of the high-frequency signal of the zero-sequence current, and the zero-crossing moment of the high-frequency signal of the first zero-sequence current is the starting moment of the second line selection detection section; the moment of the maximum absolute value of the high-frequency signal of the zero-sequence current is the moment of the terminal point of the second line selection detection section; determining the time period as the second line selection detection section according to the starting time and the end time;
s6: in the second line selection detection section, if the zero sequence transient state polarity characteristic value of only one line is positive, the line is judged to be a suspected fault line;
s7: and if 2-5 continuous suspected faulty lines determined by the second line selection detection sections are the same line, determining that the line is a faulty line, otherwise, determining that the bus is grounded.
2. The line selection method based on the ground fault arc current zero-break transient characteristic signal according to claim 1, wherein the zero-sequence transient polarity characteristic value calculation formula is as follows:
wherein, P n The zero sequence transient state polarity characteristic value of the nth line is obtained; t is the total number of the sampling values of the high-frequency signals; u. of gk A kth high-frequency signal value which is a fault phase voltage high-frequency pulse signal; i.e. i nk Is the kth high-frequency signal value of the nth line zero-sequence current high-frequency signal.
3. The line selection method based on the earth fault arc current zero-rest transient characteristic signal according to claim 1, wherein the single-phase earth fault condition is that when the amplitude of the high-frequency signal of the three-phase voltage reaches 2 times or more of the amplitude of the high-frequency noise of the three-phase voltage, and the amplitude of the high-frequency signal of the zero-sequence voltage reaches 2 times or more of the amplitude of the high-frequency noise of the zero-sequence voltage, it can be determined that the single-phase earth fault occurs in the power system.
4. The line selection method based on the ground fault arc current zero-rest transient characteristic signal according to claim 1, wherein the ground fault phase condition is when any phase voltage high-frequency signal in the three-phase voltage high-frequency signals is in phase with the zero-sequence voltage high-frequency signal; the other two-phase voltage high-frequency signals have the same phase and have the phase difference with the zero-sequence voltage high-frequency signal
Within the range, one phase of the three-phase voltage high-frequency signals, which is in the same phase with the zero-sequence voltage high-frequency signals, can be judged as a ground fault phase.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1804649A (en) * | 2005-01-12 | 2006-07-19 | 杭州佳和电气有限公司 | Fault line selection method for single-phase-to-ground fault in small ground current distribution network |
| CN101478149A (en) * | 2009-01-16 | 2009-07-08 | 西安交通大学 | Wire selection method for power distribution network single phase earthing failure based on transient signal |
| CN109490687A (en) * | 2018-10-31 | 2019-03-19 | 南京国电南自电网自动化有限公司 | One kind is based on failure phase angle and the polar single-phase earth fault detecting method of transient current |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1180273C (en) * | 2001-11-28 | 2004-12-15 | 淄博科汇电气有限公司 | Sectional detection method of small current earthing fault of power system |
| FI115488B (en) * | 2003-10-22 | 2005-05-13 | Abb Oy | Method and apparatus for detecting a breaking earth fault in a power distribution network |
| CN100530884C (en) * | 2007-10-11 | 2009-08-19 | 天津大学 | Self-adaption route selection method for single-phase ground fault of power distribution network based on transient zero sequence current |
| CN102135591A (en) * | 2011-02-28 | 2011-07-27 | 长沙理工大学 | Resonant grounding power grid single-phase ground fault db wavelet transient component line selection method |
| EP2985613B1 (en) * | 2013-03-29 | 2022-02-09 | Beijing Inhand Networks Technology Co., Ltd. | Method and system for detecting and locating single-phase ground fault on low current grounded power-distribution network |
| CN105548806A (en) * | 2015-12-14 | 2016-05-04 | 山东理工大学 | Small current grounding fault line selection method based on transient traveling wave |
| CN108663599B (en) * | 2018-05-07 | 2021-01-01 | 太原理工大学 | Single-phase earth fault line selection method based on transient high-frequency component correlation analysis |
| CN110954743B (en) * | 2019-12-18 | 2020-09-25 | 山东山大电力技术股份有限公司 | Distributed wave recording device and low-current grounding line selection method |
| CN111812451B (en) * | 2020-06-04 | 2022-11-22 | 国电南瑞科技股份有限公司 | Phase current transient fault component-based distributed line selection method for power distribution network |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1804649A (en) * | 2005-01-12 | 2006-07-19 | 杭州佳和电气有限公司 | Fault line selection method for single-phase-to-ground fault in small ground current distribution network |
| CN101478149A (en) * | 2009-01-16 | 2009-07-08 | 西安交通大学 | Wire selection method for power distribution network single phase earthing failure based on transient signal |
| CN109490687A (en) * | 2018-10-31 | 2019-03-19 | 南京国电南自电网自动化有限公司 | One kind is based on failure phase angle and the polar single-phase earth fault detecting method of transient current |
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