CN109946640B - Special transformer terminal voltage and current loss judgment method based on metering automation system data - Google Patents
Special transformer terminal voltage and current loss judgment method based on metering automation system data Download PDFInfo
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Abstract
The invention discloses a voltage and current loss judgment method for a special transformer terminal based on metering automation system data, which comprises the following steps: step 100, an analysis platform acquires voltage and current parameter values of a special transformer terminal from a measurement automation system reflux database; 200, after acquiring voltage and current parameter values of the special transformer terminal, the analysis platform judges whether the corresponding special transformer terminal generates voltage loss and current loss faults through a built-in judgment module; the data acquired by the main station based on the metering automation system is automatically analyzed to judge whether the phenomenon of pressure loss and current loss exists or not, and a series of preprocessing is performed on the data, so that data analysis personnel can accurately position real abnormal events, and the time of a fault disappearance closed loop is shortened. Measurement operators do not need to directly face massive measurement data, but can directly judge results according to the results of system calculation, calculation difficulty in the actual operation processing process is reduced, and calculation efficiency is improved.
Description
Technical Field
The invention relates to the technical field of electric power, in particular to a voltage and current loss judgment method for a special transformer terminal based on metering automation system data.
Background
The traditional measurement fault finding means mainly comprise weekly inspection, first inspection, meter reading of meter reading personnel, abnormal electric quantity accounting, electricity utilization inspection and the like. The inspection mode causes long duration of metering faults, cannot find the faults in time, is easy to cause loss to both power supply and power utilization parties, and even influences safe power supply.
Along with the progress of science and technology, the measurement automation system can realize real-time acquisition, monitoring, analysis and processing of measurement electric energy information, and can quickly search for measurement faults. The metering automation system main station has the function of analyzing according to the acquired data to judge whether metering abnormal phenomena exist, but the system has higher false alarm rate for data judgment, is not beneficial to data analysis personnel to accurately position real abnormal events, and prolongs the time of fault elimination closed loop. This is because the main function of the metering automation system is collection, and it is not good enough to do this function for failure determination. Therefore, in actual operation, the metering operator can accurately judge whether the metering equipment has a fault condition by summarizing, analyzing and counting the electric quantity data, the load data, the event alarm information and the like of the corresponding metering equipment acquired by the metering automation system and combining with own industrial experience. However, in the face of mass data, workers cannot accurately analyze each piece of data, and the bottleneck that remote analysis of faults of metering equipment is restricted is formed.
For example, in current practical operation instances, daily vital alarms can be as many as 59 million on a daily basis in metering automation systems, but in practice, maintenance personnel have all 20 people, have no way to deal with them, and have difficulty locating and finding valid faults to deal with.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a voltage and current loss judgment method for a special transformer terminal based on metering automation system data, which can effectively solve the problems provided by the background technology.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the voltage and current loss judgment method for the special transformer terminal based on the metering automation system data comprises the following steps:
step 100, an analysis platform acquires special transformer terminal data from a measurement automation system backflow database, wherein the special transformer terminal data comprises voltage and current parameter values;
200, after the analysis platform obtains the voltage and current parameter values of the special transformer terminal, judging whether the corresponding special transformer terminal generates voltage loss and current loss faults through a built-in judgment module.
As a preferred technical solution of the present invention, in step 200, before determining whether a voltage loss or a current loss fault occurs in a corresponding dedicated transformer terminal by using a built-in determination module, the method further includes: :
carrying out missing value processing on the data of the special transformer terminal; and/or the presence of a gas in the gas,
and eliminating abnormal data in the data of the special transformer terminal.
As a preferred technical solution of the present invention, a specific way of processing the missing value of the data of the special transformer terminal is as follows:
for interval deletion, when the deletion time interval is greater than a threshold value t, performing interpolation by using a correlation interpolation method or a Lagrangian interpolation method;
and for continuous deletion, when the number of the continuous deletions is not more than the threshold n, performing interpolation by using a correlation interpolation method or a Lagrange interpolation method, and when the number of the continuous deletions is more than the threshold n, quitting the processing of the special variable terminal.
As a preferred technical solution of the present invention, the threshold t is default to 5, and the threshold n is default to 5.
As a preferred technical solution of the present invention, a specific manner of excluding abnormal data in the terminal data of the special transformer is as follows:
and for each special transformer terminal data, respectively judging whether the special transformer terminal data meet the conditions: when the three-phase three-wire B phase voltage is equal to 0, the AC phase voltage is less than 130V, and the current is less than 15A; or when the four-phase four-wire ABC three-phase voltage is less than 270V, the current is less than 15A; if not, judging that the special transformer terminal data are abnormal data; if so, judging that the special transformer terminal data are normal data.
As a preferred technical solution of the present invention, the specific steps of determining whether the corresponding dedicated transformer terminal generates voltage loss through its built-in determination module are as follows:
step S201, comparing each phase current of the special transformer terminal with a product value of the rated current of the special transformer terminal and 0.5%, when the current of the phase of the special transformer terminal is less than or equal to 0.5% of the rated current value, judging that no voltage loss fault occurs, otherwise, performing the next step;
step S202, comparing the phase voltage value of the special transformer terminal with the product value of the rated voltage and 78% of the special transformer terminal, if the phase voltage value of the special transformer terminal is greater than or equal to the 78% rated voltage value, determining that no voltage loss fault occurs, otherwise, performing the next step;
step S203, judging the voltages of the other two phases of the special transformer terminal, if any phase voltage is greater than 0, judging that no voltage loss fault occurs, and if not, performing the next step;
step S204, the data of the one-day data of the special transformer terminal is judged, and when more than 10 continuous data in one day meet the conditions, the voltage loss fault of the special transformer terminal is judged.
As a preferred technical solution of the present invention, the specific steps of determining whether a corresponding dedicated transformer terminal generates a current loss fault by a built-in determination module are as follows:
when the special transformer terminal does not have the voltage loss fault, the special transformer terminal does not have the current loss fault;
and when the voltage-loss fault occurs in the special transformer terminal, performing secondary judgment to determine whether the current-loss fault occurs.
As a preferred technical solution of the present invention, the specific steps of performing secondary determination on the dedicated transformer terminal are as follows:
step T201, comparing each phase voltage value of the special transformer terminal with a product value of the rated voltage of the special transformer terminal and 60%, if each phase voltage value is less than or equal to 60% of the rated voltage, judging that no current loss fault occurs in the special transformer terminal, otherwise, entering the next step;
step T202, comparing the current value of each phase of the special transformer terminal with the rated current of the special transformer terminal with a product value of 0.5%, if the current values of the three phases are all larger than the rated current value of 0.5%, judging that no current loss fault occurs, and if any phase current value is smaller than the rated current value of 0.5%, entering the next step;
and step T203, judging the current of the special transformer terminal.
As a preferred technical solution of the present invention, a specific method for judging the current of the special transformer terminal is as follows:
for a three-phase four-wire system, any two-phase current is greater than 0.8A, the other phase is equal to 0A, and the phase voltage B is not equal to 0;
for three-phase three-wire, any one phase current is greater than 0.8A, and the other phase is equal to 0A;
when any one of the conditions is met, the next step is carried out;
and step T204, when the special transformer terminal meets the conditions, continuously lasts for 5 days and meets the data of more than 60 points every day, judging that the special transformer terminal is in a loss state.
As a preferable embodiment of the present invention, 24 hours a day is divided into 96 points of data by taking one point of data every 15 minutes.
Compared with the prior art, the invention has the beneficial effects that:
the invention is based on the data collected by the main station of the metering automation system, and carries out autonomous analysis on the data to judge whether the phenomenon of pressure loss and flow loss exists, and in order to improve the accuracy of the system in judging the data, the invention can also carry out a series of pre-treatments on the data in the process, including the treatment of missing values, the elimination of abnormal data and the like, through the series of treatments and actual analysis, the invention is beneficial to the data analyst to accurately position real abnormal events, and shortens the time of fault missing closed loop. Measurement operators do not need to directly face massive measurement data, but can directly judge results according to the results of system calculation, calculation difficulty in the actual operation processing process is reduced, and calculation efficiency is improved.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic diagram of a pressure loss determination process according to the present invention;
fig. 3 is a schematic view of a flow structure of the fluid loss determination of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, the invention provides a voltage and current loss judgment method for a dedicated transformer terminal based on metering automation system data, which comprises the following steps:
step 100, an analysis platform acquires voltage and current parameter values of a special transformer terminal from a measurement automation system reflux database;
200, after the analysis platform obtains the voltage and current parameter values of the special transformer terminal, judging whether the corresponding special transformer terminal generates voltage loss and current loss faults through a built-in judgment module.
The invention is based on the capability of real-time acquisition, monitoring, analysis and processing of the electric energy information measured by the measurement automation system, and on the basis of the acquisition and analysis of data, the type of the fault is rapidly analyzed through the capability of automatic analysis, processing and judgment. The method has the main effects that the data can be analyzed independently, the condition that a person directly faces massive collected data is avoided, and the workload of manual calculation and direct judgment is reduced. By means of the judgment system, each piece of data is accurately analyzed and processed.
In the invention, in order to better achieve the accuracy of judgment, a built-in judgment module comprises:
processing missing values of the data of the special transformer terminal, namely preprocessing the missing values of the data acquired by the feedback database of the metering automation system to avoid the data missing values from generating 'dead loops' or BUGs which cannot be judged for the subsequent judgment;
the elimination of abnormal data, wherein after the data missing value is processed, distorted data inevitably exist, and if the distorted data are not processed, the accuracy of the final judgment result is inevitably influenced, and the step is used for preprocessing the data to remove the abnormal data;
and judging the current value of each phase and the voltage value of each phase of the special transformer terminal to judge whether a voltage loss fault and a current loss fault occur.
Specifically, the specific way of processing the data missing value of the special transformer terminal is as follows:
for interval deletion, when the deletion time interval is greater than a threshold value t, performing interpolation by using a correlation interpolation method or a Lagrangian interpolation method;
and for continuous deletion, when the number of the continuous deletions is not more than the threshold n, performing interpolation by using a correlation interpolation method or a Lagrange interpolation method, when the number of the continuous deletions is more than the threshold n, quitting the processing of the special variable terminal, and otherwise, performing the next step.
In the present embodiment, the threshold t defaults to 5, and the threshold n defaults to 5.
In the above, the correlation interpolation method is a method of calculating an intermediate point between known points according to an algorithm, that is, some data known to be correlated, and therefore, the algorithm is also called as densification of data points.
In practical problems, some inherent relationships or rules are expressed by functions, and many functions can be understood only by experiments and observation. If a certain physical quantity in practice is observed, and corresponding observed values are obtained at a plurality of different places, the Lagrangian interpolation method can find a polynomial, and the observed values are just obtained at each observed point. Such a polynomial is called lagrange (interpolation) polynomial. Mathematically, the Lagrangian interpolation method can give a polynomial function that passes exactly through several known points on a two-dimensional plane. Therefore, in order to determine a certain value at a certain point, the value of the lagrange polynomial thereof can be used as an approximate value of the accurate value, and the method is a lagrange interpolation method.
The specific way of excluding the abnormal data is as follows:
when the three-phase three-wire B phase voltage is equal to 0, the AC phase voltage is less than 130V, and the current is less than 15A;
when the four-phase four-wire ABC three-phase voltage is less than 270V, the current is less than 15A;
and when any one of the two conditions is met, entering the next step, otherwise, excluding the data until all the data are retrieved, and entering the next step.
I. As shown in fig. 2, the specific steps of determining the current value of each phase and the voltage value of each phase to determine whether a voltage loss fault occurs are as follows:
step S201, comparing each phase current of the special transformer terminal with a product value of the rated current of the special transformer terminal and 0.5%, when the current of the phase of the special transformer terminal is less than or equal to 0.5% of the rated current value, judging that no voltage loss fault occurs, otherwise, performing the next step;
step S202, comparing the phase voltage value of the special transformer terminal with the product value of the rated voltage and 78% of the special transformer terminal, if the phase voltage value of the special transformer terminal is greater than or equal to the 78% rated voltage value, determining that no voltage loss fault occurs, otherwise, performing the next step;
step S203, judging the voltages of the other two phases of the special transformer terminal, if any phase voltage is greater than 0, judging that no voltage loss fault occurs, and if not, performing the next step;
step S204, the data of the one-day data of the special transformer terminal is judged, and when more than 10 continuous data in one day meet the conditions, the voltage loss fault of the special transformer terminal is judged.
II. As shown in fig. 3, the specific steps of determining the current value of each phase and the voltage value of each phase of the dedicated transformer terminal to determine whether the current loss fault occurs are as follows:
when the special transformer terminal does not have the voltage loss fault, the special transformer terminal does not have the current loss fault;
and when the voltage-loss fault occurs in the special transformer terminal, performing secondary judgment to determine whether the current-loss fault occurs.
The specific steps of carrying out secondary judgment on the special transformer terminal are as follows:
step T201, comparing each phase voltage value of the special transformer terminal with a product value of the rated voltage of the special transformer terminal and 60%, if each phase voltage value is less than or equal to 60% of the rated voltage, judging that no current loss fault occurs in the special transformer, otherwise, entering the next step;
step T202, comparing the current value of each phase of the special transformer terminal with the rated current of the special transformer terminal with a product value of 0.5%, if the current values of the three phases are all larger than the rated current value of 0.5%, judging that no current loss fault occurs, and if any phase current value is smaller than the rated current value of 0.5%, entering the next step;
and step T203, judging the current of the special transformer terminal.
In the foregoing, a specific method for determining the current of the dedicated variable terminal is as follows:
for a three-phase four-wire system, any two-phase current is greater than 0.8A, the other phase is equal to 0A, and the phase voltage B is not equal to 0;
for three-phase three-wire, any one phase current is greater than 0.8A, and the other phase is equal to 0A;
when any one of the conditions is met, the next step is carried out;
and step T204, when the special transformer terminal meets the conditions, continuously lasts for 5 days and meets the data of more than 60 points every day, judging that the special transformer terminal is in a loss state.
In addition, in the present invention, it is further explained that: the 24-hour day was divided into 96-point data by taking one-point data every 15 minutes.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (7)
1. The voltage and current loss judgment method for the special transformer terminal based on the metering automation system data is characterized by comprising the following steps:
step 100, an analysis platform acquires special transformer terminal data from a measurement automation system backflow database, wherein the special transformer terminal data comprises voltage and current parameter values;
200, after acquiring voltage and current parameter values of the special transformer terminal, the analysis platform judges whether the corresponding special transformer terminal generates voltage loss and current loss faults through a built-in judgment module;
before the built-in judgment module judges whether the corresponding special transformer terminal generates voltage loss and current loss faults, the method further comprises the following steps: carrying out missing value processing on the data of the special transformer terminal; and/or, excluding abnormal data in the data of the special variable terminal;
the specific steps of judging whether the corresponding special transformer terminal generates voltage loss or not through the built-in judgment module are as follows:
step S201, comparing each phase current of the special transformer terminal with a product value of the rated current of the special transformer terminal and 0.5%, when the current of the phase of the special transformer terminal is less than or equal to 0.5% of the rated current value, judging that no voltage loss fault occurs, otherwise, performing the next step;
step S202, comparing the phase voltage value of the special transformer terminal with the product value of the rated voltage and 78% of the special transformer terminal, if the phase voltage value of the special transformer terminal is greater than or equal to the 78% rated voltage value, determining that no voltage loss fault occurs, otherwise, performing the next step;
step S203, judging the voltages of the other two phases of the special transformer terminal, if any phase voltage is greater than 0, judging that no voltage loss fault occurs, and if not, performing the next step;
step S204, judging the data of the one day of the special transformer terminal, and judging that the voltage loss fault occurs to the special transformer terminal when more than 10 continuous data in one day meet the above conditions;
the specific steps of judging whether the corresponding special transformer terminal generates a current loss fault through the built-in judgment module are as follows:
when the special transformer terminal does not have the voltage loss fault, the special transformer terminal does not have the current loss fault;
and when the voltage-loss fault occurs in the special transformer terminal, performing secondary judgment to determine whether the current-loss fault occurs.
2. The voltage and current loss judgment method for the special transformer terminal based on the metering automation system data as claimed in claim 1, wherein the specific way of processing the missing value of the special transformer terminal data is as follows:
for interval deletion, when the deletion time interval is greater than a threshold value t, performing interpolation by using a correlation interpolation method or a Lagrangian interpolation method;
and for continuous deletion, when the number of the continuous deletions is not more than the threshold n, performing interpolation by using a correlation interpolation method or a Lagrange interpolation method, and when the number of the continuous deletions is more than the threshold n, quitting the processing of the special variable terminal.
3. The method for judging voltage and current loss of the dedicated transformer terminal based on the metering automation system data as claimed in claim 2, wherein the threshold t is 5 by default, and the threshold n is 5 by default.
4. The voltage and current loss judgment method for the special transformer terminal based on the metering automation system data is characterized in that the specific mode of eliminating abnormal data in the special transformer terminal data is as follows:
and for each special transformer terminal data, respectively judging whether the special transformer terminal data meet the conditions: when the three-phase three-wire B phase voltage is equal to 0, the AC phase voltage is less than 130V, and the current is less than 15A; or when the four-phase four-wire ABC three-phase voltage is less than 270V, the current is less than 15A; if not, judging that the special transformer terminal data are abnormal data; if so, judging that the special transformer terminal data are normal data.
5. The voltage and current loss judgment method for the special transformer terminal based on the metering automation system data is characterized in that the specific steps of carrying out secondary judgment on the special transformer terminal are as follows:
step T201, comparing each phase voltage value of the special transformer terminal with a product value of the rated voltage of the special transformer terminal and 60%, if each phase voltage value is less than or equal to 60% of the rated voltage, judging that no current loss fault occurs in the special transformer terminal, otherwise, entering the next step;
step T202, comparing the current value of each phase of the special transformer terminal with the rated current of the special transformer terminal with a product value of 0.5%, if the current values of the three phases are all larger than the rated current value of 0.5%, judging that no current loss fault occurs, and if any phase current value is smaller than the rated current value of 0.5%, entering the next step;
and step T203, judging the current of the special transformer terminal.
6. The voltage and current loss judgment method for the special transformer terminal based on the metering automation system data is characterized in that the specific method for judging the current of the special transformer terminal is as follows:
for a three-phase four-wire system, any two-phase current is greater than 0.8A, the other phase is equal to 0A, and the phase voltage B is not equal to 0;
for three-phase three-wire, any one phase current is greater than 0.8A, and the other phase is equal to 0A;
when any one of the conditions is met, the next step is carried out;
and step T204, when the special transformer terminal meets the conditions, continuously lasts for 5 days and meets the data of more than 60 points every day, judging that the special transformer terminal is in a loss state.
7. The method for judging voltage and current loss of the special transformer terminal based on the metering automation system data as claimed in claim 1 or 6, wherein the 24 hours a day is divided into 96 points of data by taking one point of data every 15 minutes.
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| CN113140096B (en) * | 2021-04-23 | 2022-09-30 | 广东电网有限责任公司 | Method, device, equipment and storage medium for monitoring and judging station loss of voltage |
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| CN104459475A (en) * | 2014-12-29 | 2015-03-25 | 国家电网公司 | Method for managing power utilization user behaviors based on power grid on-line monitoring information |
| CN105137385A (en) * | 2015-08-28 | 2015-12-09 | 国家电网公司 | Method of automatically monitoring resident three phase meter metering faults |
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| CN108732528A (en) * | 2018-05-28 | 2018-11-02 | 国网福建省电力有限公司电力科学研究院 | A kind of digitalized electrical energy meter method for diagnosing faults based on depth confidence network |
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