CN112114226A - Power transmission line fault diagnosis method based on zero-sequence current detection technology - Google Patents
Power transmission line fault diagnosis method based on zero-sequence current detection technology Download PDFInfo
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- CN112114226A CN112114226A CN202010823318.5A CN202010823318A CN112114226A CN 112114226 A CN112114226 A CN 112114226A CN 202010823318 A CN202010823318 A CN 202010823318A CN 112114226 A CN112114226 A CN 112114226A
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- 238000001514 detection method Methods 0.000 title claims abstract description 16
- 230000005540 biological transmission Effects 0.000 title claims abstract description 12
- 238000000034 method Methods 0.000 title claims abstract description 12
- 238000003745 diagnosis Methods 0.000 title claims abstract description 8
- 238000001914 filtration Methods 0.000 claims abstract description 4
- 230000001052 transient effect Effects 0.000 claims description 3
- 238000005070 sampling Methods 0.000 abstract description 2
- 238000009413 insulation Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
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- 230000016507 interphase Effects 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/175—Indicating the instants of passage of current or voltage through a given value, e.g. passage through zero
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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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- General Physics & Mathematics (AREA)
- Locating Faults (AREA)
Abstract
The invention discloses a transmission line fault diagnosis method based on a zero sequence current detection technology, which comprises the following steps: on each line at the bus outlet, recording type fault indicators are uniformly installed at intervals from the head end to the tail end of the line; the fault indicators are numbered from left to right and from top to bottom; extracting zero sequence current of each line, and filtering each zero sequence current; then sorting according to the magnitude of the zero sequence current value; determining a line where the maximum value of the zero-sequence current is located as a fault line; and determining the line section between the fault indicator with the maximum value of the zero sequence current and the adjacent fault indicator as a fault section. The invention has simple line selection principle and low sampling frequency, quickly and accurately positions the line fault section and reduces the blind repeated fault area searching.
Description
Technical Field
The invention relates to the technical field of power transmission lines, in particular to a power transmission line fault diagnosis method based on a zero-sequence current detection technology.
Background
The power distribution network has wide coverage and directly provides power utilization service for users. According to statistics, the single-phase earth fault accounts for about 80% of the faults of the power distribution network. The resonant grounding system of the power distribution network is a neutral point grounding system through an arc suppression coil, and belongs to a low-current grounding system. When a small current grounding system breaks down, the non-fault phase-to-ground voltage is influenced to rise, and the voltage rise can damage the insulation of the power grid equipment; particularly, intermittent arc grounding causes arc overvoltage, which develops into interphase or multipoint grounding short circuit by destroying system insulation, causes system overvoltage, thereby damaging equipment and destroying safe operation of the system, so that a fault line must be accurately and quickly found and the fault must be timely cleared. When a system has a low-current single-phase earth fault, the fault current is very small, and a fault signal is weak, so that fault detection, line selection and positioning are difficult.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a power transmission line fault diagnosis method based on a zero sequence current detection technology, and solves the problem that fault detection, line selection and positioning are difficult in the prior art.
In order to achieve the purpose, the invention provides the following technical scheme:
a transmission line fault diagnosis method based on a zero sequence current detection technology comprises the following steps:
step 1, mounting recording type fault indicators at uniform intervals from the head end to the tail end of each line at a bus outlet;
step 2, numbering the fault indicators from left to right and from top to bottom, wherein the number of each fault indicator is formed by a number X-Y, X represents a line where the fault indicator is located, and Y represents the sequence of the fault indicators on the line;
step 3, extracting the zero sequence current of each line, and filtering each zero sequence current; then sorting according to the magnitude of the zero sequence current value;
step 4, determining the line where the maximum value of the zero-sequence current is located as a fault line;
and 5, determining a line section between the fault indicator where the zero sequence current maximum value is located and the adjacent fault indicator as a fault section.
In the step 3, a threshold value I0 for starting the fault indicator is set, the transient zero-sequence currents of all detection points at the position of the collected bus outlet are compared with the threshold value I0 for starting the fault indicator, and whether the starting condition of the fault indicator is met is judged; and if the condition is met, starting the fault indicator and recording fault information.
In the step 3, the data quality judgment is carried out on the zero sequence current in each line by using the digital notch filter, the data quality confidence coefficient is determined, and bad data with low data quality confidence coefficient are removed without participating in subsequent calculation.
In the step 4, when the fault discriminant value of a certain line is equal to the maximum value of the fault discriminant of all the lines, the line is a fault line; when the fault discrimination formula value is not equal to the maximum value of all the line fault discrimination formulas, the line is a non-fault line;
when the fault criterion pi (t) is max { P1(t), P2 (t).., pn (t) }, the line i is a fault line; when the fault discriminant pi (t) ≠ max { P1(t), P2 (t).., pn (t) }, then i is a non-faulty line.
The invention has the technical effects and advantages that:
the invention has simple line selection principle and low sampling frequency, quickly and accurately positions the line fault section and reduces the blind repeated fault area searching. The method has the advantages of low cost, simplicity, easy implementation, high efficiency, high accuracy, safety and reliability.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments 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.
Examples
A transmission line fault diagnosis method based on a zero sequence current detection technology comprises the following steps:
step 1, uniformly installing a recording-wave type fault indicator every 2 meters on each line at a bus outlet from the head end to the tail end of the line;
step 2, numbering the fault indicators from left to right and from top to bottom, wherein the number of each fault indicator is formed by a number X-Y, X represents a line where the fault indicator is located, and Y represents the sequence of the fault indicators on the line; for example, the 5 th fault indicator on the 1 st branch line, numbered 1-5;
step 3, extracting the zero sequence current of each line, and filtering each zero sequence current; then sorting according to the magnitude of the zero sequence current value;
setting a threshold value I0 for starting the fault indicator, comparing the transient zero-sequence current of each detection point at the position of the collected bus outlet with the threshold value I0 for starting the fault indicator, and judging whether the starting condition of the fault indicator is met; and if the condition is met, starting the fault indicator and recording fault information.
And (3) carrying out data quality judgment on the zero sequence current in each line by using a digital notch filter, determining the confidence coefficient of the data quality, and eliminating bad data with low confidence coefficient of the data quality without participating in subsequent calculation.
Step 4, determining the line where the maximum value of the zero-sequence current is located as a fault line;
when the fault discriminant value of a certain line is equal to the maximum value of all the line fault discriminants, the line is a fault line; when the fault discrimination formula value is not equal to the maximum value of all the line fault discrimination formulas, the line is a non-fault line;
when the fault criterion pi (t) is max { P1(t), P2 (t).., pn (t) }, the line i is a fault line; when the fault discriminant pi (t) ≠ max { P1(t), P2 (t).., pn (t) }, then i is a non-faulty line.
And 5, determining a line section between the fault indicator where the zero sequence current maximum value is located and the adjacent fault indicator as a fault section.
In the description of the present invention, unless otherwise expressly specified or limited, the terms "disposed," "mounted," "connected," and "secured" are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integral to; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (4)
1. A transmission line fault diagnosis method based on a zero sequence current detection technology is characterized by comprising the following steps:
step 1, mounting recording type fault indicators at uniform intervals from the head end to the tail end of each line at a bus outlet;
step 2, numbering the fault indicators from left to right and from top to bottom, wherein the number of each fault indicator is formed by a number X-Y, X represents a line where the fault indicator is located, and Y represents the sequence of the fault indicators on the line;
step 3, extracting the zero sequence current of each line, and filtering each zero sequence current; then sorting according to the magnitude of the zero sequence current value;
step 4, determining the line where the maximum value of the zero-sequence current is located as a fault line;
and 5, determining a line section between the fault indicator where the zero sequence current maximum value is located and the adjacent fault indicator as a fault section.
2. The method for diagnosing the fault of the power transmission line based on the zero sequence current detection technology of claim 1, wherein in the step 3, a threshold value I0 for starting the fault indicator is set, the transient zero sequence current of each detection point at the position of the collected bus outlet is compared with the threshold value I0 for starting the fault indicator, and whether the starting condition of the fault indicator is met is judged; and if the condition is met, starting the fault indicator and recording fault information.
3. The method for diagnosing the faults of the power transmission line based on the zero-sequence current detection technology as claimed in claim 1, wherein in the step 3, a digital notch filter is used for judging the data quality of the zero-sequence current in each line, the confidence coefficient of the data quality is determined, bad data with low confidence coefficient of the data quality are removed, and the bad data do not participate in subsequent calculation.
4. The method for diagnosing the fault of the power transmission line based on the zero-sequence current detection technology according to claim 1, wherein in the step 4, when the fault discriminant value of a certain line is equal to the maximum value of the fault discriminants of all the lines, the line is a faulty line; when the fault discrimination formula value is not equal to the maximum value of all the line fault discrimination formulas, the line is a non-fault line;
when the fault criterion pi (t) is max { P1(t), P2 (t).., pn (t) }, the line i is a fault line; when the fault discriminant pi (t) ≠ max { P1(t), P2 (t).., pn (t) }, then i is a non-faulty line.
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| CN202010823318.5A CN112114226A (en) | 2020-08-17 | 2020-08-17 | Power transmission line fault diagnosis method based on zero-sequence current detection technology |
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| CN202010823318.5A CN112114226A (en) | 2020-08-17 | 2020-08-17 | Power transmission line fault diagnosis method based on zero-sequence current detection technology |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104597378A (en) * | 2015-01-26 | 2015-05-06 | 福州大学 | Fault line-selection method of power distribution network containing DG based on transient state non-power-frequency zero-sequence currents |
| CN106443334A (en) * | 2016-09-18 | 2017-02-22 | 昆明理工大学 | Zero sequence current difference polarity comparison based power distribution network fault line selection method |
| CN107589346A (en) * | 2017-10-20 | 2018-01-16 | 邓永忠 | The method that power distribution network realizes fault location and boundary by fault detector |
| CN108872795A (en) * | 2018-07-26 | 2018-11-23 | 国网福建省电力有限公司 | The single-phase lost territory Fault Locating Method of isolated neutral system based on zero-sequence current |
| CN109298288A (en) * | 2018-11-29 | 2019-02-01 | 中国矿业大学 | The distribution network failure section accurate positioning method of wide area zero-sequence current distributed intelligence |
-
2020
- 2020-08-17 CN CN202010823318.5A patent/CN112114226A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104597378A (en) * | 2015-01-26 | 2015-05-06 | 福州大学 | Fault line-selection method of power distribution network containing DG based on transient state non-power-frequency zero-sequence currents |
| CN106443334A (en) * | 2016-09-18 | 2017-02-22 | 昆明理工大学 | Zero sequence current difference polarity comparison based power distribution network fault line selection method |
| CN107589346A (en) * | 2017-10-20 | 2018-01-16 | 邓永忠 | The method that power distribution network realizes fault location and boundary by fault detector |
| CN108872795A (en) * | 2018-07-26 | 2018-11-23 | 国网福建省电力有限公司 | The single-phase lost territory Fault Locating Method of isolated neutral system based on zero-sequence current |
| CN109298288A (en) * | 2018-11-29 | 2019-02-01 | 中国矿业大学 | The distribution network failure section accurate positioning method of wide area zero-sequence current distributed intelligence |
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