CN113376561B - Electric energy metering device remote calibration system based on peer comparison mode - Google Patents
Electric energy metering device remote calibration system based on peer comparison mode Download PDFInfo
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- CN113376561B CN113376561B CN202110464547.7A CN202110464547A CN113376561B CN 113376561 B CN113376561 B CN 113376561B CN 202110464547 A CN202110464547 A CN 202110464547A CN 113376561 B CN113376561 B CN 113376561B
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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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- 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
- G01R35/04—Testing or calibrating of apparatus covered by the other groups of this subclass of instruments for measuring time integral of power or current
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Abstract
The invention discloses a remote calibration system of an electric energy metering device based on a peer comparison mode, which mainly comprises a data acquisition module and a data analysis module, wherein the data acquisition module acquires an electric energy metering error of the electric energy metering device, a current balance value of a current transformer, a voltage balance value of a voltage transformer and a secondary voltage drop error of the current transformer and the voltage transformer, the data analysis module performs superposition calculation on the electric energy metering error, the secondary voltage drop error and an externally input transformer error to obtain an electric energy metering comprehensive error, monitors the current balance value and the voltage balance value, performs out-of-tolerance warning on the current transformer when the current balance value exceeds a current balance threshold value, and performs out-of-tolerance warning on the voltage transformer when the voltage balance value exceeds a voltage balance threshold value. The invention can remotely check the electric energy metering device in real time and can find out secondary circuit faults, mutual inductors and over-tolerance phenomena of the electric energy metering device in time.
Description
Technical Field
The invention relates to the technical field of electric energy metering verification, in particular to a remote verification system for an electric energy metering device based on a peer comparison mode.
Background
The detection of the electric energy metering device is the basis of the accounting of the technical and economic indexes of the power grid operation, and is the legal basis for the settlement of the electric charge of both sides of a trade. With the reform of power system, the separation of plant network and the gradual enterprise operation of power grid company, the metering of the electric energy of the gateway/extra-large user related to the transaction of the large electric quantity of the power grid is the most important in the electric energy metering work of the power grid company. The management method of the electric energy metering device is mainly that professionals regularly carry instrument equipment to the site for periodic inspection. As the number of metering devices increases with the scale of the power grid, the traditional mode of operation is difficult to maintain, the main reasons include: 1) the workload of recording, arranging and verifying data is large, the sharing performance is poor, the consulting is very inconvenient, and the data comparison and assessment error change trend work is complicated; 2) the manual verification period is long, and the problems of faults, electricity stealing or over-tolerance of the electric energy metering device before the verification period cannot be found and processed in time; 3) when the accuracy of the electric energy meter is tested on site, certain requirements are required for the load of a line (the calibration current of the electric energy meter is more than 10%, the calibration current of the S-level electric energy meter is more than 5%, the power factor is more than 0.5, and the load is relatively stable), and once the load or the power factor is too low, the test work cannot be carried out; 4) the error of the mutual inductor in operation is always replaced by the first detection error, the actual load of the mutual inductor is generally greatly lower than the rated capacity of the mutual inductor, and the offline mutual inductor is detected data when the secondary load range is 25% -100% of the rated capacity, so that the mutual inductor error and the offline detection error in operation are different.
Disclosure of Invention
The invention aims to provide a remote calibration system and a remote calibration method for an electric energy metering device based on a peer comparison mode, which can remotely calibrate the electric energy metering device in real time and can timely find out secondary circuit faults, mutual inductors and over-tolerance phenomena of the electric energy metering device.
In order to solve the technical problem, the invention adopts a technical scheme 1 that: the remote calibration system for the electric energy metering device based on the peer comparison mode comprises a standard signal source, a data acquisition module and a data analysis module; the data acquisition module is used for acquiring an output signal of the electric energy metering device and a standard signal output by the standard signal source, comparing the output signal with the standard signal to obtain an electric energy metering error, and sending the electric energy metering error to the data analysis module;
collecting currents on three windings of a current transformer CT on the same bus as the electric energy metering device, mutually subtracting the currents on the three windings to obtain three current difference values, carrying out multi-input single-output dimensionality reduction calculation on the three current difference values by using a principal component analysis method to obtain a current balance value, and sending the current balance value to a data analysis module, wherein the three windings of the current transformer are respectively a protection winding connected with protection equipment, a detection winding connected with detection equipment and a metering winding connected with the electric energy metering device;
collecting voltages output by three phases of a voltage transformer on the same bus as the current transformer, mutually subtracting the voltages output by the three phases to obtain three voltage difference values, carrying out multi-input single-output dimension reduction calculation on the three voltage difference values by using a principal component analysis method to obtain a voltage balance value, and sending the voltage balance value to a data analysis module;
the device comprises a current transformer, a voltage transformer, a data analysis module, a voltage transformer and a voltage transformer, wherein the current transformer and the voltage transformer are used for collecting secondary output voltage of a winding outlet end of the current transformer and the voltage transformer and input voltage of the winding before the winding enters the electric energy metering device;
the data analysis module is used for carrying out superposition calculation on the electric energy metering error, the secondary voltage drop error and an externally input transformer error to obtain an electric energy metering comprehensive error, monitoring a current balance value and a voltage balance value, carrying out current transformer out-of-tolerance warning when the current balance value exceeds a current balance threshold value, and carrying out voltage transformer out-of-tolerance warning when the voltage balance value exceeds a voltage balance threshold value.
Preferably, the data analysis module is further configured to perform a current transformer fault prompt when the current balance value changes but does not exceed the current balance threshold value, so as to prompt that an output signal of the current transformer is unstable.
Preferably, the data analysis module is further configured to obtain three voltage difference values and compare the three voltage difference values with each other to determine an abnormal phase when the voltage balance value changes but does not exceed the voltage balance threshold.
Preferably, the data acquisition module is further configured to acquire a loop current on windings of the current transformer and the voltage transformer, and multiply the loop current by the secondary voltage drop error to obtain actual loads of the current transformer and the voltage transformer.
Preferably, the remote calibration system for the electric energy metering device further comprises a local platform and a remote platform, and the data analysis module is further configured to send an electric energy meter error, a secondary voltage drop error, a transformer error, an electric energy metering composite error, a current transformer out-of-tolerance warning and a voltage transformer out-of-tolerance warning to the local platform and the remote platform.
Preferably, the currents on the three windings of the current transformer are acquired by a stepped TMR current sensor.
Preferably, the current balance threshold and the voltage balance threshold are not more than 1.5 times of current balance values and voltage balance values acquired and calculated by a current transformer T and a voltage transformer PT in an offline test. Different from the prior art, the invention has the beneficial effects that:
the monitoring of the running state of each component of the running electric energy metering device is realized, and the phenomena of secondary circuit faults, mutual inductors and electric energy meter out-of-tolerance in the electric energy metering device can be found in time;
(1) based on the same-level comparison principle, the method can realize the discrimination of the metering state of the mutual inductor in operation by adopting a principal component analysis method, the mutual comparison among a plurality of windings in a body is adopted for CT, and the comparison among A, B, C three phases of the same line is adopted for PT to analyze the metering performance;
(2) the abnormal state of the electric energy metering device can be conveniently found and processed in time by metering management personnel, and accurate fault points and fault occurrence time are provided for supplementing the electric quantity.
Drawings
Fig. 1 is a schematic composition diagram of a peer comparison-based remote verification system for an electric energy metering device according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of on-line acquisition of effective data of the transformer.
Fig. 3 is a schematic diagram of an application of a stepped TMR current sensor to collect current.
FIG. 4 is a graph of TMR applied magnetic field versus output voltage.
Fig. 5 is a voltage data fragment diagram collected by a voltage transformer PT in three-phase operation of a line i bus of a certain 110kV substation.
Fig. 6 is a voltage balance value diagram obtained by a principal component analysis method of a conventional three-phase voltage.
Fig. 7 is a fragmentary view of voltage data collected by the voltage transformer PT.
Fig. 8 is a voltage balance value statistic graph obtained by the conventional principal component analysis method after the data of fig. 7 are changed.
Fig. 9 is a graph of the meter winding output voltage signals of the potential transformer PT for both phase a of mother i and phase a of mother ii.
FIG. 10 is a graph of the voltage balance statistics for M1 and M2.
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.
Fig. 1 is a schematic diagram illustrating a remote calibration system of an electric energy metering device based on a peer comparison method according to an embodiment of the present invention. The remote calibration system of the electric energy metering device based on the peer comparison mode comprises a standard signal source 10, a data acquisition module 20 and a data analysis module 30;
the data acquisition module 20 is configured to acquire an output signal of the electric energy metering device and a standard signal output by the standard signal source 10, compare the output signal with the standard signal to obtain an electric energy metering error, and send the electric energy metering error to the data analysis module 30.
The data acquisition module 20 is used for acquiring currents on three windings of a current transformer CT on the same bus as the electric energy metering device, mutually subtracting the currents on the three windings to obtain three current difference values, performing multi-input single-output dimensionality reduction calculation on the three current difference values by using a principal component analysis method to obtain a current balance value QI, and sending the current balance value QI to the data analysis module 30, wherein the three windings of the current transformer CT are respectively a protection winding connected with a protection device, a detection winding connected with a detection device and a metering winding connected with the electric energy metering device. In the present embodiment, the currents on the three windings of the current transformer CT are collected by a stepped TMR current sensor. As shown in fig. 2, three windings of the current transformer CT are provided with a TMR current sensor in a stepped manner.
The data acquisition module 20 is configured to acquire voltages output by three phases of the voltage transformer PT on the same bus as the current transformer CT, obtain three voltage difference values by performing a difference between the voltages output by the three phases, perform a multi-input single-output dimensionality reduction calculation on the three voltage difference values by using a principal component analysis method to obtain a voltage balance value QU, and send the voltage balance value QU to the data analysis module 30.
And the data acquisition module 20 is used for acquiring secondary output voltage U of the winding wire outlet ends of the current transformer CT and the voltage transformer PT 0 And the secondary winding is woundInput voltage U before entering electric energy metering device 1 The secondary output voltage and the input voltage are subtracted to obtain a secondary voltage drop error of the transformer, and the secondary voltage drop error is sent to the data analysis module 30. As shown in fig. 3, the secondary output voltage is acquired at the winding outlet terminal of the current transformer CT and the voltage transformer PT, and the input voltage is acquired at the secondary winding at the inlet terminal of the electric energy metering device.
The data analysis module 30 is configured to perform superposition calculation on the electric energy measurement error, the secondary voltage drop error, and an externally input transformer error to obtain an electric energy measurement comprehensive error, monitor the current balance value QI and the voltage balance value QU, perform a current transformer out-of-tolerance warning when the current balance value QI exceeds a current balance threshold, and perform a voltage transformer out-of-tolerance warning when the voltage balance value QU exceeds a voltage balance threshold.
The current balance threshold and the voltage balance threshold can be determined according to a current balance value and a voltage balance value acquired and calculated by a current transformer CT and a voltage transformer PT in an off-line test, and for a 0.2-level transformer, according to a relevant specification, the current balance threshold and the voltage balance threshold cannot be larger than 1.5 times of the current balance value and the voltage balance value calculated in an off-line process.
In this embodiment, the data analysis module 30 is further configured to perform a current transformer fault notification to notify that the output signal of the current transformer is unstable when the current balance value QI changes but does not exceed the current balance threshold.
The data analysis module 30 is further configured to obtain three voltage difference values and compare the three voltage difference values with each other to determine the abnormal phase when the voltage balance value QU changes but does not exceed the voltage balance threshold.
The data acquisition module 20 is further configured to acquire a loop current I on windings of the current transformer CT and the voltage transformer PT, and multiply the loop current I by a secondary voltage drop error to obtain an actual load Z of the current transformer CT and the voltage transformer PT L 。
The remote calibration system of the electric energy metering device further comprises a local platform 40 and a remote platform 50, and the data analysis module 30 is further configured to send an electric energy meter error, a secondary voltage drop error, a transformer error, an electric energy metering composite error, a current transformer out-of-tolerance warning and a voltage transformer out-of-tolerance warning to the local platform 40 and the remote platform 50.
The data acquisition module 20 can subtract the power background effects when calculating the current balance value QI and the voltage balance value QU. For example, a current transformer CT of a line i bus of a 110kV substation has 3 secondary output windings, which are respectively a protection winding, a detection winding and a metering winding, and adopts a stepped TMR current sensor to collect 3 secondary winding magnetic fields and 3 winding magnetic fields, and a TMR external magnetic field and an output voltage curve are shown in fig. 4, the stepped TMR current sensor can accurately measure the magnetic field generated by each winding of the current transformer CT and output with a stable small voltage signal, after obtaining the voltage signal corresponding to each winding of the current transformer CT, the power supply background influence can be deducted by making a difference, and then the principal component analysis is performed to obtain the current balance value QI in operation.
Compared with the traditional principal component analysis method, the accuracy of the obtained voltage balance value QU by the data acquisition module 20 is higher. Fig. 5 is a voltage data segment acquired by a voltage transformer PT in a three-phase (A, B, C-phase) operation of a line i bus of a certain 110kV substation, and fig. 6 is a voltage balance value obtained by a principal component analysis method of a conventional three-phase voltage. Therefore, the voltage balance value obtained by the traditional principal component analysis method represents the comprehensive change condition of the three-phase output voltage.
After the partial data of the voltage acquisition data of the phase a is reduced by 0.2%, the voltage data segment acquired by the voltage transformer PT is as shown in fig. 7, and fig. 8 is a voltage balance value statistic obtained by the conventional principal component analysis method after the data of fig. 7 is changed. It can be obviously found from fig. 8 that a part of the voltage balance values are reduced, and it can be known that the accuracy of calculating the voltage balance values is affected if the power supply of a certain phase voltage transformer PT is abnormal, which is the calculation deviation caused by the background error, and meanwhile, it is proved that the accuracy of the traditional principal component analysis method depends on the stability of the power supply.
And data acquisition module 20 employs an optimized principal component analysis that subtracts the background of power effects. For the same 110kV transformer substation, the I parent and the II parent of the substation are operated in parallel, namely two groups of voltage transformers PT are from the same voltage class, output voltage signals of the metering windings of the A-phase voltage transformers PT of the I parent and the A-phase voltage transformers PT of the II parent are obtained, as shown in fig. 9, two groups of voltage values are marked as M1 and M2, and the voltage balance value statistics of M1 and M2 is obtained by an optimization principal component analysis method of deducting background influence quantity and is shown in fig. 10. Comparing fig. 6 and fig. 10, it can be known that the voltage balance value of the traditional principal component analysis method varies from-0.015 to +0.035 in thousandth, the voltage balance value of the optimized principal component analysis method varies from-0.0023 to +0.007 in ten thousandth. And then solving the operation error value of the voltage transformer PT for the voltage balance value according to the original principal component analysis mode. The data acquisition module 20 is proved to have a great improvement on the calculation accuracy of the operation error.
Through the way, the electric energy metering device remote calibration system based on the peer comparison way has the following characteristics:
1) the TMR current sensor is used as a secondary current acquisition device of the current transformer CT for the first time, the sensor is an external electric field measurement sensor based on a Wheatstone bridge, the non-contact measurement is adopted, the state of a secondary circuit in the operation of the current transformer CT cannot be changed, and the TMR can not distinguish sources for magnetic field acquisition, so that a stepped TMR acquisition mode is designed, the mutual interference of magnetic fields generated by a plurality of secondary currents is avoided, and the purpose of distinguishing the output currents of secondary windings is realized;
2) the principal component analysis of the signal difference is added to the original principal component analysis and calculation mode to be used as an optimized calculation mode for deducting power supply noise, so that the calculation accuracy of the current balance value and the voltage balance value is improved;
3) the current balance value QI and the voltage balance value QU are used for judging whether the current transformer CT and the voltage transformer PT are abnormal in metering during operation;
4) the data acquisition module 20 and the data analysis module 30 are installed on the electric energy metering device side, and except that the secondary output voltage of the winding wire outlet end of the voltage transformer PT is acquired on the equipment installation site side, the other parts are all located on the electric energy metering device side.
The above description is only an example of the present application and is not intended to limit the scope of the present application, and various modifications and changes may be made to the present application by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Claims (7)
1. A remote calibration system of an electric energy metering device based on a peer comparison mode is characterized by comprising a standard signal source, a data acquisition module and a data analysis module;
the data acquisition module is used for acquiring an output signal of the electric energy metering device and a standard signal output by the standard signal source, comparing the output signal with the standard signal to obtain an electric energy metering error, and sending the electric energy metering error to the data analysis module;
collecting currents on three windings of a current transformer on the same bus as the electric energy metering device, mutually subtracting the currents on the three windings to obtain three current difference values, carrying out multi-input single-output dimensionality reduction calculation on the three current difference values by using a principal component analysis method to obtain a current balance value, and sending the current balance value to a data analysis module, wherein the three windings of the current transformer are respectively a protection winding connected with protection equipment, a detection winding connected with detection equipment and a metering winding connected with the electric energy metering device;
collecting voltages output by three phases of a voltage transformer on the same bus as the current transformer, mutually subtracting the voltages output by the three phases to obtain three voltage difference values, carrying out multi-input single-output dimension reduction calculation on the three voltage difference values by using a principal component analysis method to obtain a voltage balance value, and sending the voltage balance value to a data analysis module;
the device comprises a current transformer, a voltage transformer, a transformer winding outlet end, a transformer winding voltage output end, a transformer winding output end, a;
the data analysis module is used for carrying out superposition calculation on the electric energy metering error, the secondary voltage drop error and an externally input mutual inductor error to obtain an electric energy metering comprehensive error, monitoring a current balance value and a voltage balance value, carrying out current mutual inductor out-of-tolerance warning when the current balance value exceeds a current balance threshold value, and carrying out voltage mutual inductor out-of-tolerance warning when the voltage balance value exceeds a voltage balance threshold value.
2. The remote calibration system of claim 1, wherein the data analysis module is further configured to perform a current transformer fault notification to indicate that the output signal of the current transformer is unstable when the current balance value changes but does not exceed the current balance threshold.
3. The system of claim 2, wherein the data analysis module is further configured to obtain three voltage differences and compare the three voltage differences with each other to determine the abnormal phase when the voltage balance value changes but does not exceed the voltage balance threshold.
4. The system of claim 1, wherein the data collection module is further configured to collect loop currents on windings of the current transformer and the voltage transformer, and multiply the loop currents by the secondary voltage drop error to obtain actual loads of the current transformer and the voltage transformer.
5. The system for remotely verifying electric energy metering devices based on the peer comparison manner according to any one of claims 1 to 4, wherein the system for remotely verifying electric energy metering devices further comprises a local platform and a remote platform, and the data analysis module is further configured to send an electric energy meter error, a secondary voltage drop error, a transformer error, an electric energy metering composite error, a current transformer out-of-tolerance warning and a voltage transformer out-of-tolerance warning to the local platform and the remote platform.
6. The system for remotely verifying electric energy metering devices in a peer-to-peer comparison manner according to any one of claims 1 to 4, wherein the currents on the three windings of the current transformer are acquired by a TMR current sensor.
7. The system of claim 1, wherein the current balance threshold and the voltage balance threshold are not greater than 1.5 times of current balance values and voltage balance values obtained by collecting and calculating a current transformer CT and a voltage transformer PT during an offline test.
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| CN101968536A (en) * | 2010-09-01 | 2011-02-09 | 江西省电力科学研究院 | Induction voltage divider based method for judging detection error exception of voltage transformer |
| CN104614699A (en) * | 2012-10-29 | 2015-05-13 | 江苏省电力公司常州供电公司 | Higher-efficiency remote monitoring and diagnosis method of electric energy metering device |
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