CN-121978583-A - Low-voltage transformer area distribution line leakage judging method and system

CN121978583ACN 121978583 ACN121978583 ACN 121978583ACN-121978583-A

Abstract

A low-voltage station distribution line leakage judging method and system comprises the steps of initially screening out a suspected leakage station area of class I and a suspected leakage station area of class II in all low-voltage station areas according to acquired low-voltage station area data, acquiring a gateway table and a user table indicating value curve at each moment every day in a third period set before the current days, calculating corresponding loss electric quantity at each moment, judging whether leakage exists in the suspected leakage station area of class I according to the fluctuation rate of the loss electric quantity, judging whether leakage exists in the suspected leakage station area of class II according to the change rate of the loss electric quantity, selecting a period for acquiring data according to the leakage type, acquiring average current of three phases per day in the selected period before the current days, and calculating the change quantity of the average current ratio of the three phases to judge the occurrence of leakage. The invention judges according to the leakage type, solves the problem of difficult qualitative leakage of the transformer area, and further improves the leakage checking priority.

Inventors

WU WEIJIANG
PANG JINXIN
ZHAO SHUANGSHUANG
CAO XIAODONG
GAO FAN
ZHANG ZHEN
CUI GAOYING
ZHUANG CHEN
JIA TING

Assignees

国网江苏省电力有限公司营销服务中心

Dates

Publication Date: 20260505
Application Date: 20260403

Claims (12)

1. The utility model provides a low-voltage station district distribution lines electric leakage discriminating method which is characterized in that the method comprises the following steps: Adaptively calculating a second period according to the standard deviation of the line loss rate and the standard deviation of the air humidity in a basic period set before the current day; The method comprises the steps of obtaining the loss electric quantity and the line loss rate of each day in a first period set before the current days of all low-voltage station areas, primarily screening out the suspected leakage station areas of class I in all low-voltage station areas, wherein the leakage type of the suspected leakage station areas of class I is continuous leakage, primarily screening out the suspected leakage station areas of class II in all low-voltage station areas according to the line loss rate and the air humidity of each day in a second period before the current days of all low-voltage station areas, wherein the leakage type of the suspected leakage station areas of class II is intermittent leakage; Acquiring a gateway table and a user table value curve at each moment in each day in a third period set before the current day of all the suspected radio leakage station areas, and calculating the corresponding loss electric quantity at each moment; For the areas judged to have electric leakage, selecting a period for collecting data according to the electric leakage type, acquiring the average current of three phases in each selected period before the current days, and calculating the change quantity of the average current ratio of the three phases to judge the phase of electric leakage.
2. The method for discriminating leakage of distribution lines in a low voltage transformer area according to claim 1, wherein: the second period is calculated adaptively according to the standard deviation of the line loss rate and the standard deviation of the air humidity in the basic period set before the current day, and specifically comprises the following steps: Calculating standard deviation of line loss rate and standard deviation of air humidity in a basic period set before the current days, normalizing to obtain normalized standard deviation of the line loss rate and normalized standard deviation of the air humidity, selecting a larger value in the normalized standard deviation of the line loss rate and the normalized standard of the air humidity to multiply by a set coefficient, taking the negative number of the multiplied result as an index, taking natural logarithm e as a base to carry out exponential operation, and taking a second period as the product of the exponential operation result and the basic period to be rounded up if the product of the exponential operation result and the basic period is larger than the first period, otherwise, taking the second period as the product of the exponential operation result and the basic period to be rounded up; the set basic period is larger than the first period, and the first period is larger than the third period.
3. The method for discriminating leakage of distribution lines in a low voltage transformer area according to claim 1, wherein: The preliminary screening of the suspected radio leakage station areas of class I in all the low-voltage station areas comprises the following specific steps: Calculating the difference between the loss electric quantity and the line loss rate of each day except for the first day and the first day in a first set period of all the areas, and judging the corresponding area as a suspected radio leakage area of the I type if the difference between the loss electric quantity of each day except for the first day and the first day of the areas exceeds a set loss electric quantity difference value and the difference between the line loss rate of each day except for the first day and the first day exceeds a set first line loss rate difference value.
4. The method for discriminating leakage of distribution lines in a low voltage transformer area according to claim 2, wherein: The preliminary screening of the II-type suspected radio leakage station areas in all the low-voltage station areas comprises the following specific steps: And if the Pearson correlation coefficient exceeds a set correlation coefficient threshold, the air humidity of the day before the current day exceeds a set air humidity threshold, and the line loss rate of the day before the current day minus the line loss rate of the day two before the current day exceeds a set second line loss difference threshold, judging the corresponding station as a suspected radio leakage station area of class II.
5. The method for discriminating leakage of distribution lines in a low voltage transformer area according to claim 1, wherein: the calculation of the corresponding loss electric quantity at each moment specifically comprises the following steps: the indication value of the gateway table at each moment is the power supply quantity at the corresponding moment, the indication value of the user table at each moment is the power selling quantity at each moment, and the power selling quantity at the corresponding moment is subtracted from the power supply quantity at each moment to obtain the loss power at the corresponding moment.
6. The method for discriminating leakage of distribution lines in a low voltage transformer area according to claim 4 wherein: for the suspected leakage station area of class I, judging whether leakage exists according to the fluctuation rate of the lost electric quantity, specifically: calculating standard deviation of the lost electric quantity at all times of the corresponding days as the fluctuation rate of the lost electric quantity of the corresponding days for each day in a third period set before the current days; And if the fluctuation rate of the daily lost electric quantity in the set third period before the current day of the existence of the I-type suspected radio leakage station area is smaller than the set fluctuation rate threshold value, judging that the electric leakage exists in the corresponding I-type suspected radio leakage station area.
7. The method for discriminating leakage of distribution lines in a low voltage transformer area according to claim 4 wherein: For a suspected leakage station area of II, judging whether leakage exists according to the change rate of the lost electric quantity, specifically: Calculating the increase rate of the lost electric quantity at each time of the day before the current day compared with the increase rate of the lost electric quantity at the corresponding time of the day after the current day, if the increase rate of the lost electric quantity at the existing time exceeds a set increase rate threshold, the corresponding time is the increase time, and if the total number of the increase times of the suspected radio leakage station areas with the II types exceeds a set number threshold, the existence of electric leakage in the suspected radio leakage station areas with the II types is judged.
8. The method for discriminating leakage of distribution lines in a low voltage transformer area according to claim 5 wherein: For the transformer area judged to have electric leakage, selecting a period for collecting data according to the electric leakage type, specifically: when the leakage type is continuous leakage, selecting the period for collecting data as a set first period; when the leakage type is intermittent leakage, selecting the period for collecting data as a set third period.
9. The method for discriminating leakage of distribution lines in a low voltage transformer area according to claim 8, wherein: The change amount of the average current ratio of the three phases is calculated to judge the phase with electric leakage, specifically: Obtaining the average current of three phases of each day in a selected period before the current day, and calculating the average current of three phases of each day divided by the sum of the average currents of the three phases to obtain the average current duty ratio of the three phases; And calculating the difference between the average current ratios of the three phases of the day except the first day and the first day in the selected period as the average current ratio change amount of the three phases of the corresponding day, and judging that the corresponding phase is leaked if the average current ratio change amount of one phase of the day exceeds the set ratio change amount threshold value.
10. A low voltage distribution line leakage discriminating system based on the method of any one of claims 1-9, comprising a station line loss data acquiring module, a leakage station primary screening module, a station gateway table and user table data acquiring module, a leakage station discriminating module, a current curve data acquiring module, a leakage phase discriminating module and an abnormal output module, and being characterized in that: The station area line loss data acquisition module is used for adaptively calculating a second period according to the standard deviation of the line loss rate and the standard deviation of the air humidity in a basic period set before the current day, acquiring the loss electric quantity and the line loss rate in a first period set before the current day of all low-voltage station areas, and acquiring the line loss rate and the air humidity in the second period before the current day of all station areas; The leakage station area preliminary screening module is used for preliminarily screening out the type I suspected leakage station areas in all low-voltage station areas according to the loss electric quantity and the line loss rate in a first period set before the current days of all low-voltage station areas, wherein the type I suspected leakage station areas are continuously leaked, and the type II suspected leakage station areas in all low-voltage station areas are preliminarily screened out according to the line loss rate and the air humidity in a second period before the current days of all low-voltage station areas; The system comprises a station area gateway table and a user table data acquisition module, wherein the station area gateway table and user table data acquisition module is used for acquiring a set third period inner gateway table and each time indication curve of the user table before the current days of all suspected radio leakage stations; The leakage station area judging module is used for judging whether leakage exists in the I type suspected leakage station area according to the fluctuation rate of the lost electric quantity; The current curve data acquisition module is used for selecting a period for collecting data according to the type of the electric leakage for the station area judged to have the electric leakage, and acquiring the average current of three phases of each day in the selected period before the current days; The leakage phase judging module is used for calculating the variation of the average current ratio of the three phases and judging the phase in which the leakage occurs; and the abnormal output module is used for outputting the type of electric leakage, judging the area of electric leakage and the phase of electric leakage occurrence.
11. An apparatus comprising a memory, a processor and a computer program stored in the memory and executable on the processor, the processor performing the steps of using the low voltage block distribution line leakage discrimination method of any one of claims 1 to 9.
12. A computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program which, when executed by a processor, uses the steps of the low-voltage distribution line leakage discriminating method according to any one of claims 1 to 9.

Description

Low-voltage transformer area distribution line leakage judging method and system Technical Field The invention belongs to the technical field of transformer area line loss, and particularly relates to a low-voltage transformer area distribution line leakage judging method and system. Background The electric leakage is one of the most direct influencing factors of the economic operation, reliable power supply and safe power supply of the distribution line of the low-voltage transformer area. In the daily operation and maintenance of a low-voltage transformer area, the abnormal positioning priority is obviously delayed after the line loss abnormal factors such as abnormal acquisition, abnormal measurement, abnormal files and the like are usually subjected to electric leakage inspection. The traditional leakage checking relies on experience of operation and maintenance personnel and simple tools, and the huge topological relation and complicated space layout of a low-voltage transformer area greatly limit the timeliness of leakage detection, so that the electric quantity is continuously lost. The prior art discloses a low-voltage distribution line leakage monitoring method, a device, a medium and equipment (CN 117786440A), wherein a time sequence data set is established by taking zero line current, live line current and power of a low-voltage distribution user as influence quantities, a clustering method based on granularity calculation is adopted to cluster the time sequence data set, a nonlinear function relation between the influence quantity of each clustering type and the leakage current is obtained, finally, the clustering type of the low-voltage distribution line to be monitored is determined, and the leakage current is estimated by adopting the corresponding nonlinear function relation. The technology has the defects that a large number of low-voltage distribution user metering devices are wired in a common zero mode in a real scene, so that zero line current data distortion influences clustering accuracy, and the final achievement of the technology can only judge whether the low-voltage distribution line to be detected has electric leakage or not, and cannot give a specific range of the electric leakage. Disclosure of Invention In order to solve the defects existing in the prior art, the invention provides a low-voltage transformer area distribution line leakage judging method and system. The invention adopts the following technical scheme. The invention provides a low-voltage transformer area distribution line leakage judging method, which is characterized by comprising the following steps of: Adaptively calculating a second period according to the standard deviation of the line loss rate and the standard deviation of the air humidity in a basic period set before the current day; according to the acquired daily loss electric quantity and line loss rate in a first period set before the current days of all low-voltage station areas, initially screening out I-type suspected leakage station areas in all low-voltage station areas, wherein the leakage type of the I-type suspected leakage station areas is continuous leakage; according to the obtained line loss rate and air humidity of each day in a second period before the current days of all the transformer areas, initially screening out a class II suspected leakage transformer area in all the low-voltage transformer areas, wherein the leakage type of the class II suspected leakage transformer area is intermittent leakage; Acquiring a gateway table and a user table value curve at each moment in each day in a third period set before the current day of all the suspected radio leakage station areas, and calculating the corresponding loss electric quantity at each moment; For the areas judged to have electric leakage, selecting a period for collecting data according to the electric leakage type, acquiring the average current of three phases in each selected period before the current days, and calculating the change quantity of the average current ratio of the three phases to judge the phase of electric leakage. Preferably, the second period is calculated adaptively according to the standard deviation of the line loss rate and the standard deviation of the air humidity in the basic period set before the current day, specifically: Calculating standard deviation of line loss rate and standard deviation of air humidity in a basic period set before the current days, normalizing to obtain normalized standard deviation of the line loss rate and normalized standard deviation of the air humidity, selecting a larger value in the normalized standard deviation of the line loss rate and the normalized standard of the air humidity to multiply by a set coefficient, taking the negative number of the multiplied result as an index, taking natural logarithm e as a base to carry out exponential operation, and taking a second period as the product of the exponential operation resu