CN113777551B - Current transformer transformation ratio checking method for special line special power user metering device - Google Patents
Current transformer transformation ratio checking method for special line special power user metering device Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
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Abstract
The invention discloses a transformation ratio checking method for a current transformer of a special-line special-purpose power user metering device, which comprises the following steps: respectively acquiring user and line total current curve data, and calculating line total current curve data corresponding to the user; calculating the ratio of the primary current of the line to the secondary current of the user; 30% of the data was retained as calculated data; calculating the determination probability of the transformation ratio of the standard current transformer; estimating a transformation ratio value of the field current transformer device, and selecting the standard current transformer change with the maximum probability as the transformation ratio value of the estimated field current transformer device; comparing the estimated current transformer transformation ratio value with the current transformer transformation ratio value recorded in the system file to determine whether the current transformer transformation ratio value recorded in the system file is abnormal or not; the technical problems that current transformer transformation ratio recorded by files of a metering system in the prior art is inconsistent with actual transformation ratio of an on-site power transformer device, and the current transformer transformation ratio is difficult to find in a short time are solved.
Description
Technical Field
The invention belongs to the technical field of metering, and particularly relates to a method for checking the transformation ratio of a current transformer of a special-line special-purpose power consumer metering device.
Background
The electricity consumption of the power consumer is calculated by multiplying the metering value of the metering device by the comprehensive multiplying power of the user file. The comprehensive multiplying power of the user file is obtained by multiplying the transformation ratio of the current transformer corresponding to the user metering device recorded by the system by the transformation ratio of the voltage transformer, so that it is very important that the transformation ratio of the current transformer corresponding to the user metering device recorded by the system is consistent with the transformation ratio of the current transformer corresponding to the actual field metering device.
The current transformer transformation ratio corresponding to the user metering device recorded by the system is manually recorded into the system. In the actual process, there are reasons that the transformation ratio of the current transformer is wrong, the user applies for replacing the current transformer of the metering device, but the electric power constructor can not change the file in the marketing system, the user changes the current transformer of the metering device privately, the updated file of the marketing system is not pushed to the metering system in time, and the like, so that the transformation ratio of the current transformer recorded by the file of the metering system is inconsistent with the transformation ratio of the current transformer corresponding to the on-site user metering device, the electric quantity of the user calculated by the metering system is wrong, and the normal electric charge calculation of the user is influenced.
Disclosure of Invention
The invention aims to solve the technical problems that: the utility model provides a special line special power user metering device current transformer transformation ratio checking method to solve the current transformer transformation ratio that prior art metering system archives record and the actual transformation ratio of on-the-spot power transformer device inconsistent and difficult to discover in short time, generally through regular manual on-the-spot investigation discovery, the cycle of discovery is longer etc. technical problem.
The technical scheme of the invention is as follows:
a transformation ratio checking method for a current transformer of a special line special power user metering device comprises the following steps:
step 1, respectively acquiring user and line total current curve data, acquiring three pieces of 15-minute current curve data of a user A, B, C by a metering automation system, and calculating line total current curve data corresponding to the user;
step 2, calculating the ratio of the primary current of the line to the secondary current of the user;
step 3, data processing: 30% of the data was retained as calculated data;
step 4, calculating the determination probability of the transformation ratio of the standard current transformer;
step 5, according to the calculated determination probability of the transformation ratio of each standard current transformerEstimating a transformation ratio beta of a field current transformer device e Selecting the standard current transformer change with the maximum probability as the estimated change ratio value of the field current transformer device;
step 6, comparing the estimated transformation ratio beta of the current transformer e And the transformation ratio beta of the current transformer recorded in the system file f If the current transformer transformation values are consistent, the current transformer transformation values recorded in the system file are not abnormal; if the current transformer transformation values are inconsistent, the current transformer transformation values recorded in the system file are considered to be abnormal.
And when the current transformer transformation ratio recorded in the system file is abnormal, marking.
The method for calculating the line total current curve data corresponding to the user in the step 1 is as follows:
the metering automation system collects three pieces of 15-minute current curve data of a user A, B, C, and the total current curve data of the user is calculated by the following formula:
the line where the special line special transformer user is located is found according to the user number, and the SCADA system collects three 15-minute current curve data of the line A, B, C, so that the total current curve data of the line corresponding to the user is calculated by the following formula:
the method for calculating the ratio of the primary current of the line to the secondary current of the user in the step 2 is as follows: the ratio calculation method of the primary current of each 15-minute time node line and the secondary current of the user is as follows:
the determining method for reserving 30% of data as calculated data in the step 3 is as follows: the current data curve acquires 96 points in one day, eliminates 64 points of data, only retains 32 points of data as sample data, and the 32 sample data are non-zero and minimum current data, and are expressed as: alpha= { alpha 1 ,α 2 ,…,α 32 -a }; the data of 32 points refers to the data of 8 hours of the working time of the exclusive user.
The method for calculating the determination probability of the transformation ratio of the standard current transformer in the step 4 is as follows:
step 4.1, calculating the distance between the sample data and the transformation ratio of the standard current transformer: the transformation ratio of a single standard current transformer is marked as beta i (i is a number), and all the transformation ratios of the standard current transformers form a standard transformation ratio set beta= { beta 1 ,β 2 ,…,β 77 -a }; the distance between the sample data and the transformation ratio of the single standard current transformer is expressed as:
step 4.2, determining a transformation ratio of the standard current transformer according to single sample data: calculating single sample data alpha j The distance between the current transformer and all the standard current transformers is used for selecting the standard current transformer transformation ratio corresponding to the smallest distance as the standard current transformer transformation ratio determined by the sample data,
step 4.3, determining the transformation ratio of the single standard current transformerProbability: respectively determining the transformation ratio of a standard transformer for all sample data, and recording the transformation ratio beta of a certain standard current transformer i N in number, the transformation ratio beta of the standard current transformer i The probability of determination of (1) is:
ratio of change beta e The expression of (2) is:
the invention has the beneficial effects that:
the invention combines the collected data of the SCADA system and the data of the metering automation system, establishes a remote checking method of the metering current transformer device transformation ratio of the special line special transformer based on the collected data, realizes the intelligent identification of the abnormal transformation ratio file of the special line special transformer user, realizes the active identification and the real-time monitoring of the abnormal transformation ratio of the current transformer, greatly shortens the abnormal discovery period, and greatly improves the checking efficiency of the special line special transformer file; the technical problems that current transformer transformation ratio recorded by files of a metering system in the prior art is inconsistent with actual transformation ratio of an on-site power transformer device, the current transformer transformation ratio is difficult to find in a short time, the current transformer transformation ratio is generally found through regular manual on-site investigation, the found period is relatively long and the like are solved.
Drawings
FIG. 1 is a schematic flow chart of the present invention.
Detailed Description
The specific implementation flow of the invention comprises the following steps:
1) And (3) data acquisition: the total current curve data of the user and the line are respectively acquired, and the metering automation system can acquire three 15-minute current curve data of the user A, B, C, so that the total current curve data of the user can be calculated by the following formula:
the line where the special line special transformer user is located can be found according to the user number, and the SCADA system collects three 15-minute current curve data of the line A, B, C, so that the total current curve data of the line corresponding to the user can be calculated by the following formula:
2) Calculating the ratio of the primary current of the line to the secondary current of the user: the ratio calculation method of the primary current of each 15-minute time node line and the secondary current of the user is as follows:
the current data collected by the metering automation system is the secondary current data of the user, the current data collected by the SCADA system is the primary current data of the line, and the theoretical ratio alpha t Is the transformation ratio of the current transformer at the user side. Actually because of the existence of factors such as wire loss, alpha t The transformation ratio of the current transformer is not equal to that of the current transformer at the user side, but is very close to that of the current transformer at the user side.
3) And (3) data processing: considering that the current data are all calculated by the transformation of the current transformer, the accuracy of the calculated data is related to the measuring range and the actual current of the current transformer. The closer the actual current is to the maximum flow of the current transformer, the more accurate the measured data, otherwise the larger the deviation. The current of the user concentrated power consumption period is larger, and the measurement accuracy is high; the current is smaller when no electricity is used, and the measurement accuracy is larger. Considering that the private transformer users are basically industrial users, the working time is 8 hours, and the total time is 24 hours a day, 30% of data is reserved as calculation data. The current data curve acquires 96 points in one day, eliminates 64 points of data, only retains 32 points of data as sample data, and the 32 sample data are non-zero and minimum current data, and are expressed as: alpha= { alpha 1 ,α 2 ,…,α 32 }。
4) The determination probability of the transformation ratio of the standard current transformer is calculated by the following steps:
(1) calculating the distance between the sample data and the transformation ratio of the standard current transformer: the actual current transformer arrangement has 77 standard transformation ratios, see table 1.
Standard current transformer transformation ratio list:
the transformation ratio of a single standard current transformer is marked as beta i (i is a number), and all the transformation ratios of the standard current transformers form a standard transformation ratio set beta= { beta 1 ,β 2 ,…,β 77 }. The distance of the sample data from the transformation ratio of the single standard current transformer can be expressed as:
(2) determining a standard current transformer transformation ratio according to single sample data: calculating single sample data alpha according to (4) j The distance between the current transformer transformation ratio and all the standard current transformers is selected, and the standard current transformer transformation ratio with the smallest distance is used as the sampleThe transformation ratio of the standard current transformer determined by the data is expressed as follows:
(3) calculating the determination probability of the transformation ratio of the single standard current transformer: respectively determining the transformation ratio of a standard transformer for all sample data, and recording the transformation ratio beta of a certain standard current transformer i N in number, the transformation ratio beta of the standard current transformer i The probability of determination of (1) is:
5) According to the calculated determination probability of the transformation ratio of each standard current transformerEstimating a transformation ratio beta of a field current transformer device e The standard current transformer change with the largest probability is selected as the estimated change ratio value of the field current transformer device, and the method is expressed as follows:
6) The current transformer transformation ratio of the special line special transformer user current transformer metering device is checked by the following steps: comparing the estimated transformation ratio beta of the current transformer e And the transformation ratio beta of the current transformer recorded in the system file f If the current transformer transformation values are consistent, the current transformer transformation values recorded in the system file are not abnormal; if the current transformer transformation values are inconsistent, the current transformer transformation values recorded in the system file are considered to be abnormal, and the current transformer transformation values are marked.
Claims (6)
1. A transformation ratio checking method for a current transformer of a special line special power user metering device comprises the following steps:
step 1, respectively acquiring user and line total current curve data, acquiring three pieces of 15-minute current curve data of a user A, B, C by a metering automation system, and calculating line total current curve data corresponding to the user;
step 2, calculating the ratio of the primary current of the line to the secondary current of the user;
step 3, data processing: 30% of the data was retained as calculated data;
step 4, calculating the determination probability of the transformation ratio of the standard current transformer, wherein the method comprises the following steps:
step 4.1, calculating the distance between the sample data and the transformation ratio of the standard current transformer: the transformation ratio of a single standard current transformer is marked as beta i (i is a number), and all the transformation ratios of the standard current transformers form a standard transformation ratio set beta= { beta 1 ,β 2 ,…,β 77 -a }; the distance between the sample data and the transformation ratio of the single standard current transformer is expressed as:
step 4.2, determining a transformation ratio of the standard current transformer according to single sample data: calculating single sample data alpha j The distance between the current transformer and all the standard current transformers is used for selecting the standard current transformer transformation ratio corresponding to the smallest distance as the standard current transformer transformation ratio determined by the sample data,
step 4.3, calculating the determination probability of the transformation ratio of the single standard current transformer: respectively determining the transformation ratio of a standard transformer for all sample data, and recording the transformation ratio beta of a certain standard current transformer i N in number, the transformation ratio beta of the standard current transformer i The probability of determination of (1) is:
step 5, according to the meterDetermining probability of transformation ratio of each standard current transformer obtained by calculationEstimating a transformation ratio beta of a field current transformer device e Selecting the standard current transformer change with the maximum probability as the estimated change ratio value of the field current transformer device;
step 6, comparing the estimated transformation ratio beta of the current transformer e And the transformation ratio beta of the current transformer recorded in the system file f If the current transformer transformation values are consistent, the current transformer transformation values recorded in the system file are not abnormal; if the current transformer transformation values are inconsistent, the current transformer transformation values recorded in the system file are considered to be abnormal.
2. The method for checking the transformation ratio of the current transformer of the special-line special-purpose power consumer metering device according to claim 1, wherein the method comprises the following steps of: and when the current transformer transformation ratio recorded in the system file is abnormal, marking.
3. The method for checking the transformation ratio of the current transformer of the special-line special-purpose power consumer metering device according to claim 1, wherein the method comprises the following steps of: the method for calculating the line total current curve data corresponding to the user in the step 1 is as follows:
the metering automation system collects three pieces of 15-minute current curve data of a user A, B, C, and the total current curve data of the user is calculated by the following formula:
the line where the special line special transformer user is located is found according to the user number, and the SCADA system collects three 15-minute current curve data of the line A, B, C, so that the total current curve data of the line corresponding to the user is calculated by the following formula:
4. the method for checking the transformation ratio of the current transformer of the special-line special-purpose power consumer metering device according to claim 1, wherein the method comprises the following steps of: the method for calculating the ratio of the primary current of the line to the secondary current of the user in the step 2 is as follows: the ratio calculation method of the primary current of each 15-minute time node line and the secondary current of the user is as follows:
5. the method for checking the transformation ratio of the current transformer of the special-line special-purpose power consumer metering device according to claim 1, wherein the method comprises the following steps of: the determining method for reserving 30% of data as calculated data in the step 3 is as follows: the current data curve acquires 96 points in one day, eliminates 64 points of data, only retains 32 points of data as sample data, and the 32 sample data are non-zero and minimum current data, and are expressed as: alpha= { alpha 1 ,α 2 ,…,α 32 -a }; the data of 32 points refers to the data of 8 hours of the working time of the exclusive user.
6. The method for checking the transformation ratio of the current transformer of the special-line special-purpose power consumer metering device according to claim 1, wherein the method comprises the following steps of: ratio of change beta e The expression of (2) is:
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| CN115542029B (en) * | 2022-09-21 | 2023-12-08 | 正泰集团研发中心(上海)有限公司 | On-site matching method and system of mutual inductor |
| CN115494442A (en) * | 2022-10-14 | 2022-12-20 | 国网四川省电力公司电力科学研究院 | Energy equivalence-based multi-current transformer transformation ratio error detection method and system |
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