CN113219295A - Power transmission and distribution line abnormity detection method based on working environment - Google Patents
Power transmission and distribution line abnormity detection method based on working environment Download PDFInfo
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- CN113219295A CN113219295A CN202110244586.6A CN202110244586A CN113219295A CN 113219295 A CN113219295 A CN 113219295A CN 202110244586 A CN202110244586 A CN 202110244586A CN 113219295 A CN113219295 A CN 113219295A
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 62
- 238000001514 detection method Methods 0.000 title claims abstract description 13
- 230000007613 environmental effect Effects 0.000 claims abstract description 8
- 239000004020 conductor Substances 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 6
- 230000035699 permeability Effects 0.000 claims description 6
- 230000016507 interphase Effects 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 claims description 3
- 229910052753 mercury Inorganic materials 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
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- 229920006395 saturated elastomer Polymers 0.000 claims description 2
- 230000002159 abnormal effect Effects 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 2
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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
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K13/00—Thermometers specially adapted for specific purposes
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
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Abstract
The invention provides a power transmission and distribution line abnormity detection method based on a working environment, which comprises the following steps: (1): collecting environmental information; (2): extracting temperature information; (3): calculating the real-time resistance of the power transmission and distribution line; (4): a resistance reference value is adjusted according to the temperature information; (5): judging whether the real-time resistance is larger than a resistance reference value or not, and if so, alarming; if not, recording the real-time resistance, and entering (6); (6): calculating the real-time reactance of the power transmission and distribution line; (7): a reactance reference value is adjusted according to the temperature information; (8): judging whether the real-time reactance is greater than a reactance reference value or not, and if so, alarming; if not, recording the real-time reactance, and entering (9); (9): extracting humidity information; (10): calculating the real-time susceptance of the power transmission and distribution line; (11): calling a susceptance reference value according to the temperature information; (12): judging whether the real-time susceptance is larger than the susceptance reference value, and if so, alarming; if not, recording the real-time reactance susceptance, and returning to the step (1).
Description
Technical Field
The invention belongs to the technical field of electric power detection, and particularly relates to a power transmission and distribution line abnormity detection method based on a working environment.
Background
The traditional power transmission and distribution line abnormity detection method is established according to the physical relation of single electric quantity of a power grid, so that the electric quantity of the power transmission and distribution line is involved in detection, and the operation state of the power transmission and distribution line is determined through analysis and judgment of the electric quantities.
The invention provides a power transmission and distribution line abnormity detection method based on a working environment.
Disclosure of Invention
The invention provides a power transmission and distribution line abnormity detection method based on a working environment, which can more accurately judge whether the power transmission and distribution line is abnormal or not and improve the working reliability.
The invention specifically relates to a power transmission and distribution line abnormity detection method based on a working environment, which comprises the following steps:
step (1): collecting the environmental information of the power transmission and distribution line;
step (2): extracting temperature information;
and (3): calculating the real-time resistance of the power transmission and distribution line;
and (4): a resistance reference value is obtained according to the temperature information;
and (5): judging whether the real-time resistance is larger than the resistance reference value or not, and if so, sending out a real-time resistance abnormity alarm; if not, recording the real-time resistance, and entering the step (6);
and (6): calculating the real-time reactance of the power transmission and distribution line;
and (7): a reactance reference value is obtained according to the temperature information;
and (8): judging whether the real-time reactance is greater than the reactance reference value, and if so, sending a real-time reactance abnormity alarm; if not, recording the real-time reactance, and entering the step (9);
and (9): extracting humidity information;
step (10): calculating the real-time susceptance of the power transmission and distribution line;
step (11): calling a susceptance reference value according to the temperature information;
step (12): judging whether the real-time susceptance is larger than the susceptance reference value, and if so, sending a real-time susceptance abnormity alarm; if not, recording the real-time reactance susceptance, and returning to the step (1).
And the power transmission and distribution line environmental information acquires real-time environmental information through an intelligent power grid microclimate monitoring system.
The real-time resistance is R ═ R0·[1+α(T-T0)]，T0Taking the mixture at the normal temperature of 20 ℃, R0Is T0And alpha is the resistance temperature correction coefficient of the power transmission and distribution line under the temperature.
The real-time reactance is
f is the electric energy frequency of the power transmission and distribution line, D is the conductor interphase distance of the power transmission and distribution line, r is the radius of the power transmission and distribution line, mu is the relative permeability of the material of the power transmission and distribution line, and the relative permeability is selected according to different temperature information.
The real-time susceptance is B-2 pi fC,
c is the conductor capacitance of the power transmission and distribution line, DiIs the outer diameter of the wire insulation layer of the power transmission and distribution line DeIs the outer diameter of the wire core of the power transmission and distribution line, epsilon is the real-time dielectric constant of the wire of the power transmission and distribution line,
P0is standard atmospheric pressure, g is the humidity information, E is measured in mm mercury at T temperatureSaturated vapor pressure
Compared with the prior art, the beneficial effects are: the power transmission and distribution line abnormity detection method calculates the real-time resistance, real-time reactance and real-time susceptance of the power transmission and distribution line according to the real-time working environment, selects different reference values according to different temperature information, and further judges whether the power transmission and distribution line is abnormal or not.
Drawings
Fig. 1 is a working flow chart of a power transmission and distribution line anomaly detection method based on a working environment.
Detailed Description
The following describes in detail a specific embodiment of the method for detecting an abnormality of a power transmission and distribution line based on a working environment according to the present invention with reference to the accompanying drawings.
As shown in fig. 1, the method for detecting an abnormality of a power transmission and distribution line according to the present invention includes the following steps:
firstly, acquiring environmental information of a power transmission and distribution line through a smart grid microclimate monitoring system.
Further, carrying out real-time resistance analysis and judgment:
extracting temperature information, calling a resistance reference value according to the temperature information, and calculating the real-time resistance R-R of the power transmission and distribution line0·[1+α(T-T0)]，T0Taking the mixture at the normal temperature of 20 ℃, R0Is T0The resistance of the power transmission and distribution line under temperature, wherein alpha is the resistance temperature correction coefficient of the power transmission and distribution line;
judging whether the real-time resistance is larger than the resistance reference value, if so, sending out a real-time resistance abnormity alarm; if not, recording the real-time resistance, and continuing to analyze and judge.
Further, real-time reactance analysis and judgment are carried out:
calculating real-time reactance of power transmission and distribution line
f is the electric energy frequency of the power transmission and distribution line, D is the conductor interphase distance of the power transmission and distribution line, and r is the power transmission and distribution lineThe radius of the line wire is mu, the relative permeability of the material of the line wire is mu, and the relative permeability is selected according to different temperature information;
a reactance reference value is obtained according to the temperature information, whether the real-time reactance is larger than the reactance reference value or not is judged, and if yes, a real-time reactance abnormity alarm is sent out; if not, recording the real-time reactance, and continuing analyzing and judging;
further, carrying out real-time susceptance analysis and judgment:
the collected humidity information is extracted and the humidity information is collected,
calculating the real-time susceptance B-2 pi fC of the power transmission and distribution line,
c is the conductor capacitance of the transmission and distribution line, DiFor the outer diameter of the insulating layer of the transmission and distribution line conductor, DeIs the outer diameter of the wire core of the power transmission and distribution line, epsilon is the real-time dielectric constant of the wire of the power transmission and distribution line,
P0is standard atmospheric pressure, g is humidity information, and E is saturated vapor pressure in millimeter mercury column at T temperature
Calling a susceptance reference value according to the temperature information, judging whether the real-time susceptance is larger than the susceptance reference value, and if so, sending a real-time susceptance abnormity alarm; if not, recording the real-time reactance susceptance, and continuously acquiring the environmental information.
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 (5)
1. A power transmission and distribution line abnormity detection method based on a working environment is characterized by comprising the following steps:
step (1): collecting the environmental information of the power transmission and distribution line;
step (2): extracting temperature information;
and (3): calculating the real-time resistance of the power transmission and distribution line;
and (4): a resistance reference value is obtained according to the temperature information;
and (5): judging whether the real-time resistance is larger than the resistance reference value or not, and if so, sending out a real-time resistance abnormity alarm; if not, recording the real-time resistance, and entering the step (6);
and (6): calculating the real-time reactance of the power transmission and distribution line;
and (7): a reactance reference value is obtained according to the temperature information;
and (8): judging whether the real-time reactance is greater than the reactance reference value, and if so, sending a real-time reactance abnormity alarm; if not, recording the real-time reactance, and entering the step (9);
and (9): extracting humidity information;
step (10): calculating the real-time susceptance of the power transmission and distribution line;
step (11): calling a susceptance reference value according to the temperature information;
step (12): judging whether the real-time susceptance is larger than the susceptance reference value, and if so, sending a real-time susceptance abnormity alarm; if not, recording the real-time reactance susceptance, and returning to the step (1).
2. The method according to claim 1, wherein the environmental information of the power transmission and distribution line is obtained in real time by a smart grid microclimate monitoring system.
3. The method according to claim 2, wherein the real-time resistance is R-R0·[1+α(T-T0)]，T0Taking the mixture at the normal temperature of 20 DEG C，R0Is T0And alpha is the resistance temperature correction coefficient of the power transmission and distribution line under the temperature.
4. The method of claim 3, wherein the real-time reactance is a real-time reactance
f is the electric energy frequency of the power transmission and distribution line, D is the conductor interphase distance of the power transmission and distribution line, r is the radius of the power transmission and distribution line, mu is the relative permeability of the material of the power transmission and distribution line, and the relative permeability is selected according to different temperature information.
5. The method of claim 4, wherein the real-time susceptance is B-2 π fC,
c is the conductor capacitance of the power transmission and distribution line, DiIs the outer diameter of the wire insulation layer of the power transmission and distribution line DeIs the outer diameter of the wire core of the power transmission and distribution line, epsilon is the real-time dielectric constant of the wire of the power transmission and distribution line,
P0is standard atmospheric pressure, g is the humidity information, E is the saturated vapor pressure in mm mercury column at T temperature
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| CN202110244586.6A CN113219295A (en) | 2021-03-05 | 2021-03-05 | Power transmission and distribution line abnormity detection method based on working environment |
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|---|---|---|---|---|
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2021
- 2021-03-05 CN CN202110244586.6A patent/CN113219295A/en active Pending
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| US20180328976A1 (en) * | 2017-05-12 | 2018-11-15 | Southern California Edison | Mapping of metallic conductors by applying radar imaging techniques to spread spectrum time domain reflectometry returns |
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