CN113777551A - Method for checking transformation ratio of current transformer of metering device for special line special power users - Google Patents
Method for checking transformation ratio of current transformer of metering device for special line special power users Download PDFInfo
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Abstract
The invention discloses a method for checking the transformation ratio of a current transformer of a metering device of a private line private power user, which comprises the following steps: respectively acquiring total current curve data of a user and a line, and calculating the total current curve data of the line 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 variable ratio of the field current transformer device, and selecting the standard current transformer change with the highest determined probability as the estimated variable ratio of the 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 the inconsistency between the current transformer transformation ratio recorded by a metering system file and the actual transformation ratio of an on-site power transformer device in the prior art is difficult to find in a short time and the like 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 metering device for a private line private power consumer.
Background
The electricity consumption of the power consumer is measured and calculated by multiplying the measured value of the measuring device by the comprehensive multiplying power of the user file. The comprehensive multiplying power of the user files is obtained by multiplying the current transformer transformation ratio and the voltage transformer transformation ratio which are recorded by the system and correspond to the user metering device, so that it is very important that the current transformer transformation ratio which is recorded by the system and corresponds to the user metering device is consistent with the current transformer transformation ratio which corresponds to the actual field metering device.
The current transformer transformation ratio recorded by the system and corresponding to the user metering device is manually input into the system. In the actual process, the reasons that the transformation ratio of the current transformer is wrongly recorded manually initially, the current transformer of the metering device is applied and replaced by a user, but a power constructor cannot change a file in a marketing system, the current transformer of the metering device is changed privately by the user, the updated file of the marketing system is not pushed to the metering system in time and the like exist, 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 metering device of the field user, the user electric quantity calculated by the metering system is wrong, and the normal electric charge calculation of the user is influenced.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the method for checking the transformation ratio of the current transformer of the metering device of the private line private power consumer is provided, and aims to solve the technical problems that the transformation ratio of the current transformer recorded by a metering system file in the prior art is inconsistent with the actual transformation ratio of a field power transformer device and is difficult to find in a short time, the discovery period is long and the like because the discovery period is generally found through regular manual field investigation.
The technical scheme of the invention is as follows:
a method for checking the transformation ratio of a current transformer of a metering device of a private line private power consumer comprises the following steps:
step 1, acquiring total current curve data of a user and a line respectively, collecting current curve data of A, B, C items of 15 minutes of the user by a metering automation system, and calculating the total current curve data of the line 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, determining probability of transformation ratio of each standard current transformer according to calculation
Estimating a transformation ratio beta of an in-situ current transformer deviceeSelecting the standard current transformer change with the maximum probability as the estimated variable ratio of the field current transformer device;
step 6, comparing the estimated variable ratio beta of the current transformereAnd the current transformer transformation ratio beta recorded in the system filefWhether the current transformer transformation ratio values are consistent or not, if so, the current transformer transformation ratio values recorded in the system files are not abnormal; and if the current transformer ratio values are inconsistent, the current transformer ratio values recorded in the system files are considered to be abnormal.
And marking when the current transformer transformation ratio value recorded in the system file is abnormal.
The method for calculating the total line current curve data corresponding to the user in the step 1 comprises the following steps:
the metering automation system collects A, B, C three items of 15-minute current curve data, and the total current curve data of the user is calculated by the following formula:
the line where the special line and special transformer users are located is found according to the user numbers, the SCADA system collects A, B, C three 15-minute current curve data, and therefore the total line current curve data corresponding to the users are calculated through the following formula:
step 2, the method for calculating the ratio of the line primary current to the user secondary current comprises the following steps: the method for calculating the ratio of the primary current of the line to the secondary current of the user at each 15-minute time node comprises the following steps:
step 3, the determination method for reserving 30% of data as calculation data is as follows: the current data curve collects 96 points in a day, eliminates data of 64 points, only retains data of 32 points as sample data, and the 32 sample data are nonzero and minimum current data and are expressed as follows: α ═ α1,α2,…,α32}; the data of the 32 points refers to data of a specific variable user working time of 8 hours.
Step 4, the method for calculating the determination probability of the transformation ratio of the standard current transformer comprises the following steps:
step 4.1, calculating the distance between the sample data and the transformation ratio of the standard current transformer: the variable ratio of the current transformer of a single standard is recorded as betai(i is a number), all the standard current transformer transformation ratios form a standard transformation ratio set beta ═ beta1,β2,…,β77}; therefore, the distance between the sample data and the transformation ratio of the single-standard current transformer is represented as:
step 4.2, determining the transformation ratio of the standard current transformer according to the single sample data: calculating a single sample data alphajSelecting the distance of all standard current transformers, and selecting the pair with the minimum distanceThe corresponding standard current transformer transformation ratio is used as the standard current transformer transformation ratio determined by the sample data,
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 transformeriN, the transformation ratio beta of the standard current transformeriThe determination probability of (2) is:
variable ratio betaeThe expression of (a) is:
the invention has the beneficial effects that:
the invention integrates the data acquired by the SCADA system and the data of the metering automation system, establishes a remote checking method of the transformation ratio of the special line special transformer user metering current transformer device based on the acquired data, realizes the intelligent identification of the abnormity of the transformation ratio file of the special line special transformer user current transformer, realizes the active identification and the real-time monitoring of the abnormity of the transformation ratio of the current transformer, greatly shortens the abnormity discovery period, and greatly improves the checking efficiency of the special line special transformer user file; the technical problems that the inconsistency between the current transformer transformation ratio recorded by a metering system file and the actual transformation ratio of an on-site power transformer device in the prior art is difficult to find in a short time, the inconsistency is generally found through regular manual on-site investigation, the finding period is long and the like are solved.
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FIG. 1 is a schematic flow chart of the present invention.
Detailed Description
The specific implementation process of the invention comprises the following steps:
1) data acquisition: the total current curve data of the user and the line are respectively obtained, and the metering automation system can collect A, B, C three items of 15-minute current curve data of the user, 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 A, B, C three 15-minute current curve data, 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 method for calculating the ratio of the primary current of the line to the secondary current of the user at each 15-minute time node comprises the following steps:
the current data collected by the measurement automation system is user secondary current data, the current data collected by the SCADA system is primary current data of a line, and the ratio alpha is theoreticallytThe transformation ratio of the current transformer at the user side. Actually because of the existence of line loss and the like, alphatThe transformation ratio of the current transformer at the user side is not equal but is very close.
3) Data processing: considering that the current data are converted and measured by the current transformer, the accuracy of the measured and measured data is related to the measuring range of the current transformer and the actual current. The closer the actual current is to the maximum flow of the current transformer, the more accurate the measured data is, otherwise, the larger the deviation is. The current is large in the concentrated electricity utilization period of the user, and the measurement precision is high; the current is small when the power is not used, and the measurement precision is high. Considering that the special transformer users are basically industrial users, the working time is 8 hours, and the time is total to one dayThere were 24 hours, so 30% of the data were retained as calculation data. The current data curve collects 96 points in a day, eliminates data of 64 points, only retains data of 32 points as sample data, and the 32 sample data are nonzero and minimum current data and are expressed as follows: α ═ α1,α2,…,α32}。
4) And calculating the determination probability of the transformation ratio of the standard current transformer, wherein the calculation method comprises the following steps:
calculating the distance between the sample data and the transformation ratio of the standard current transformer: the actual current transformer arrangement has a total of 77 standard transformation ratio values, see table 1.
Standard current transformer transformation ratio list:
the variable ratio of the current transformer of a single standard is recorded as betai(i is a number), all the standard current transformer transformation ratios form a standard transformation ratio set beta ═ beta1,β2,…,β77}. Therefore, the distance between the sample data and the transformation ratio of the single-standard current transformer can be represented as follows:
secondly, determining the transformation ratio of the standard current transformer according to single sample data: calculating a single sample data α according to equation (4)jAnd selecting the standard current transformer transformation ratio corresponding to the minimum distance as the standard current transformer transformation ratio determined by the sample data, wherein the distances from the standard current transformer transformation ratios to all the standard current transformer transformation ratios are represented as follows:
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 transformeriN, the transformation ratio beta of the standard current transformeriThe determination probability of (2) is:
5) according to the determined probability of the transformation ratio of each standard current transformer obtained by calculation
Estimating a transformation ratio beta of an in-situ current transformer deviceeAnd selecting the standard current transformer change with the highest determined probability as the estimated variable ratio of the field current transformer device, and expressing the variable ratio as follows:
6) the method for checking the transformation ratio of the current transformer of the metering device of the private line private transformer user current transformer comprises the following steps: comparing the estimated current transformer variable ratio value betaeAnd the current transformer transformation ratio beta recorded in the system filefWhether the current transformer transformation ratio values are consistent or not, if so, the current transformer transformation ratio values recorded in the system files are not abnormal; if not, the record in the system file is consideredThe current transformer transformation ratio value is abnormal, and the current transformer transformation ratio value is marked.
Claims (7)
1. A method for checking the transformation ratio of a current transformer of a metering device of a private line private power consumer comprises the following steps:
step 1, acquiring total current curve data of a user and a line respectively, collecting current curve data of A, B, C items of 15 minutes of the user by a metering automation system, and calculating the total current curve data of the line 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, determining probability eta of transformation ratio of each standard current transformer according to calculationβiEstimating a transformation ratio beta of the on-site current transformer deviceeSelecting the standard current transformer change with the maximum probability as the estimated variable ratio of the field current transformer device;
step 6, comparing the estimated variable ratio beta of the current transformereAnd the current transformer transformation ratio beta recorded in the system filefWhether the current transformer transformation ratio values are consistent or not, if so, the current transformer transformation ratio values recorded in the system files are not abnormal; and if the current transformer ratio values are inconsistent, the current transformer ratio values recorded in the system files are considered to be abnormal.
2. The method for checking the transformation ratio of the current transformer of the private line special power user metering device according to claim 1, wherein the method comprises the following steps: and marking when the current transformer transformation ratio value recorded in the system file is abnormal.
3. The method for checking the transformation ratio of the current transformer of the private line special power user metering device according to claim 1, wherein the method comprises the following steps: the method for calculating the total line current curve data corresponding to the user in the step 1 comprises the following steps:
the metering automation system collects A, B, C three items of 15-minute current curve data, and the total current curve data of the user is calculated by the following formula:
the line where the special line and special transformer users are located is found according to the user numbers, the SCADA system collects A, B, C three 15-minute current curve data, and therefore the total line current curve data corresponding to the users are calculated through the following formula:
4. the method for checking the transformation ratio of the current transformer of the private line special power user metering device according to claim 1, wherein the method comprises the following steps: step 2, the method for calculating the ratio of the line primary current to the user secondary current comprises the following steps: the method for calculating the ratio of the primary current of the line to the secondary current of the user at each 15-minute time node comprises the following steps:
5. the method for checking the transformation ratio of the current transformer of the private line special power user metering device according to claim 1, wherein the method comprises the following steps: step 3, the determination method for reserving 30% of data as calculation data is as follows: the current data curve collects 96 points in a day, eliminates data of 64 points, only retains data of 32 points as sample data, and the 32 sample data are nonzero and minimum current data and are expressed as follows: α ═ α1,α2,…,α32}; the data of the 32 points refers to data of a specific variable user working time of 8 hours.
6. The method for checking the transformation ratio of the current transformer of the private line special power user metering device according to claim 1, wherein the method comprises the following steps: step 4, the method for calculating the determination probability of the transformation ratio of the standard current transformer comprises the following steps:
step 4.1, calculating the distance between the sample data and the transformation ratio of the standard current transformer: the variable ratio of the current transformer of a single standard is recorded as betai(i is a number), all the standard current transformer transformation ratios form a standard transformation ratio set beta ═ beta1,β2,…,β77}; therefore, the distance between the sample data and the transformation ratio of the single-standard current transformer is represented as:
step 4.2, determining the transformation ratio of the standard current transformer according to the single sample data: calculating a single sample data alphajSelecting the standard current transformer transformation ratio corresponding to the minimum distance as the standard current transformer transformation ratio determined by the sample data,
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 transformeriN, the transformation ratio beta of the standard current transformeriThe determination probability of (2) is:
7. the method for checking the transformation ratio of the current transformer of the private line special power user metering device according to claim 1, wherein the method comprises the following steps: variable ratio betaeThe expression of (a) is:
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