CN113820563A - Power transmission line fault detection and positioning method based on hybrid conductor - Google Patents
Power transmission line fault detection and positioning method based on hybrid conductor Download PDFInfo
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- CN113820563A CN113820563A CN202111078884.9A CN202111078884A CN113820563A CN 113820563 A CN113820563 A CN 113820563A CN 202111078884 A CN202111078884 A CN 202111078884A CN 113820563 A CN113820563 A CN 113820563A
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 70
- 239000004020 conductor Substances 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000001514 detection method Methods 0.000 title claims abstract description 18
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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
- G01R31/083—Locating faults in cables, transmission lines, or networks according to type of conductors in cables, e.g. underground
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/088—Aspects of digital computing
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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Abstract
The invention provides a power transmission line fault detection and positioning method based on a hybrid conductor, which comprises the following steps of: (1): collecting current signals at two ends of the power transmission line; (2): performing primary fault judgment according to the current signals at the two ends of the power transmission line; (3): determining the time for the fault traveling wave current to reach the two ends of the power transmission line; (4): calculating the fault occurrence time; (5): and calculating the fault position according to the fault occurrence time. The invention provides a power transmission line fault detection and positioning method based on a hybrid conductor, which can accurately determine the fault position.
Description
Technical Field
The invention belongs to the technical field of electric power detection, and particularly relates to a power transmission line fault detection and positioning method based on a hybrid conductor.
Background
The transmission line is used as a carrier of electric energy transmission, and the safe operation of the transmission line is an important component for ensuring the safety and reliability of a power grid. The working environment of the power transmission line is various and complex and is easily influenced by the external environment.
The invention provides a power transmission line fault detection and positioning method based on a hybrid conductor, which is characterized in that whether abnormity occurs or not is preliminarily judged through a current signal, time of a fault current reaching two ends of the power transmission line is determined according to a modulo maximum value of current signals at the two ends, and the time of the fault current reaching the two ends of the power transmission line is calculated by combining parameters of the line conductor, so that a fault position can be better improved.
Disclosure of Invention
The invention provides a power transmission line fault detection and positioning method based on a hybrid conductor, which can accurately determine the fault position.
The invention specifically relates to a power transmission line fault detection and positioning method based on a hybrid conductor, which comprises the following steps:
step (1): collecting current signals at two ends of the power transmission line;
step (2): performing primary fault judgment according to the current signals at the two ends of the power transmission line;
and (3): determining the time t for the fault traveling wave current to reach the two ends of the power transmission line1、t2；
And (4): calculating the fault occurrence time;
and (5): and calculating the fault position according to the fault occurrence time.
The power transmission line conductor adopts two power transmission conductors to transmit electric energy in a segmented mode and comprises a first segmented conductor and a second segmented conductor, and the length of the first segmented conductor is L1The length of the second section of conducting wire is L2The total length of the transmission line conductor is L ═ L1+L2The signal propagation speed of the first subsection wire is v1The signal propagation speed of the second segment conductor is v2。
The specific method for preliminarily judging the fault according to the current signals at the two ends of the power transmission line comprises the following steps: judging whether current signals at two ends of the power transmission line have a value larger than a current reference value, if so, the power transmission line has a fault, and entering the step (3); if not, returning to the step (1).
The method for determining the time for the fault traveling wave current to reach the two ends of the power transmission line comprises the following steps:
finding out the current signal module maximum values at the two ends of the power transmission line, wherein the time corresponding to the current signal module maximum values at the two ends of the power transmission line is the time when the fault traveling wave current reaches the two ends of the power transmission line, namely t1、t2。
The specific method for calculating the fault occurrence time comprises the following steps:
assuming that the fault occurred in the first segmented conductor, based on
Obtaining the fault occurrence time t0(ii) a Judging t1-t0Whether or not less than
If yes, the fault occurs in the first subsection conductor, and the fault occurrence time is t0(ii) a If not, the fault occurs in the second sectionalized conductor
Obtaining the fault occurrence time t0。
Calculating the fault position according to the fault occurrence time: if the fault occurs in the first subsection conductor, the distance d-v between the fault position and the head end of the power transmission line1(t1-t0) (ii) a If the fault occurs in the second subsection conducting wire, the distance d between the fault position and the head end of the power transmission line is equal to L-v2(t2-t0)。
Compared with the prior art, the beneficial effects are: the power transmission line fault detection positioning method preliminarily judges whether abnormity occurs or not through current signals, determines the time of fault current reaching the two ends of the power transmission line according to the modulo maximum value of the current signals at the two ends, and calculates the fault position according to the time of fault occurrence of the parameters of line conductors, so that the detection result can be better improved.
Drawings
Fig. 1 is a working flow chart of a power transmission line fault detection and positioning method based on a hybrid conductor of the present invention.
Detailed Description
The following describes in detail a specific embodiment of the power transmission line fault detection and positioning method based on the hybrid conductor according to the present invention with reference to the accompanying drawings.
The power transmission line conductor adopts two power transmission conductors to transmit electric energy in a segmented mode and comprises a first segmented conductor and a second segmented conductor, and the length of the first segmented conductor is L1The length of the second section of conducting wire is L2The total length of the transmission line conductor is L ═ L1+L2The signal propagation speed of the first subsection wire is v1The signal propagation speed of the second segment conductor is v2。
As shown in fig. 1, the method for detecting and positioning the transmission line fault of the present invention includes the following steps:
step (1): collecting current signals at two ends of the power transmission line;
step (2): judging whether current signals at two ends of the power transmission line have a value larger than a current reference value, if so, the power transmission line has a fault, and entering the step (3); if not, returning to the step (1);
and (3): determining the time t for the fault traveling wave current to reach the two ends of the power transmission line1、t2: finding out the current signal module maximum values at the two ends of the power transmission line, wherein the time corresponding to the current signal module maximum values at the two ends of the power transmission line is the time when the fault traveling wave current reaches the two ends of the power transmission line, namely t1、t2；
And (4): calculating the fault occurrence time: assuming that the fault occurred in the first segmented conductor, based on
Obtaining the fault occurrence time t0(ii) a Judging t1-t0Whether or not less than
If yes, the fault occurs in the first subsection conductor, and the fault occurrence time is t0(ii) a If not, the fault occurs in the second sectionalized conductor
Obtaining the fault occurrence time t0；
And (5): calculating the fault position according to the fault occurrence time: if the fault occurs in the first subsection conductor, the distance d-v between the fault position and the head end of the power transmission line1(t1-t0) (ii) a If the fault occurs in the second subsection conducting wire, the distance d between the fault position and the head end of the power transmission line is equal to L-v2(t2-t0)。
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the same. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (6)
1. A power transmission line fault detection and positioning method based on a hybrid conductor is characterized by comprising the following steps:
step (1): and collecting current signals at two ends of the power transmission line.
Step (2): performing primary fault judgment according to the current signals at the two ends of the power transmission line;
and (3): determining the time t for the fault traveling wave current to reach the two ends of the power transmission line1、t2；
And (4): calculating the fault occurrence time;
and (5): and calculating the fault position according to the fault occurrence time.
2. The method of claim 1, wherein the transmission line conductor adopts two transmission lines for segmented transmission of electric energy, and comprises a first segmented conductor and a second segmented conductor, and the length of the first segmented conductor is L1The length of the second section of conducting wire is L2The total length of the transmission line conductor is L ═ L1+L2The signal propagation speed of the first subsection wire is v1The signal propagation speed of the second segment conductor is v2。
3. The power transmission line fault detection and positioning method based on the hybrid conductor according to claim 2, wherein the specific method for preliminarily judging the fault according to the current signals at the two ends of the power transmission line is as follows: judging whether current signals at two ends of the power transmission line have a value larger than a current reference value, if so, the power transmission line has a fault, and entering the step (3); if not, returning to the step (1).
4. The power transmission line fault detection and positioning method based on the hybrid conductor according to claim 3, wherein the method for determining the time when the fault traveling wave current reaches the two ends of the power transmission line comprises the following steps:
finding out the current signal module maximum values at the two ends of the power transmission line, wherein the time corresponding to the current signal module maximum values at the two ends of the power transmission line is the time when the fault traveling wave current reaches the two ends of the power transmission line, namely t1、t2。
5. The power transmission line fault detection and positioning method based on the hybrid conductor according to claim 4, wherein the specific method for calculating the fault occurrence time is as follows:
assuming that the fault occurred in the first segmented conductor, based on
Obtaining the fault occurrence time t0(ii) a Judging t1-t0Whether or not less than
If yes, the fault occurs in the first subsection conductor, and the fault occurrence time is t0(ii) a If not, the fault occurs in the second sectionalized conductor
Obtaining the fault occurrence time t0。
6. The hybrid conductor-based transmission line fault detection and positioning method according to claim 5, wherein a fault position is calculated according to the fault occurrence time: if the fault occurs in the first subsection conductor, the distance d-v between the fault position and the head end of the power transmission line1(t1-t0) (ii) a If the fault occurs in the second subsection conducting wire, the distance d between the fault position and the head end of the power transmission line is equal to L-v2(t2-t0)。
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| CN202111078884.9A CN113820563A (en) | 2021-09-15 | 2021-09-15 | Power transmission line fault detection and positioning method based on hybrid conductor |
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| CN202111078884.9A CN113820563A (en) | 2021-09-15 | 2021-09-15 | Power transmission line fault detection and positioning method based on hybrid conductor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114675139A (en) * | 2022-05-30 | 2022-06-28 | 辽宁汉华信息工程有限公司 | Method and system for determining position of power grid line fault |
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