CN112415465A - Remote electric energy meter fault detection and identification system - Google Patents
Remote electric energy meter fault detection and identification system Download PDFInfo
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- 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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- G—PHYSICS
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- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
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Abstract
The invention provides a remote electric energy meter fault detection and identification system, which comprises an electric energy meter information acquisition unit, a detection information acquisition unit, a signal conditioning unit, a control processing unit, a display unit, an alarm unit and a communication unit, wherein the electric energy meter information acquisition unit is used for acquiring the detection information of an electric energy meter; the electric energy meter fault detection and identification system collects output information and detection information of the electric energy meter, selects proper reference values according to different temperatures and humidity, and further analyzes and judges whether the electric energy meter is abnormal or not and judges the fault type. The invention provides a remote electric energy meter fault detection and identification system which can identify an abnormal electric energy meter and improve the accuracy of electric energy metering.
Description
Technical Field
The invention belongs to the technical field of electric power metering detection, and particularly relates to a remote electric energy meter fault detection and identification system.
Background
The electric energy metering is an important step of energy calculation between electric power enterprises and users, and along with the diversified development of an electric power market, the reliability and the accuracy of metering must be ensured in the electric energy metering work.
At present, the method for acquiring the running state error of the metering device in China usually adopts a field calibrator to carry out actual measurement calibration and evaluate the running state of the metering device. However, such field verification methods suffer from these disadvantages: the influence of external environment factors is large, and meanwhile, the load is continuously fluctuated when the detection work is carried out, so that large deviation is brought to the work of normal working condition evaluation of the electric energy metering device. In addition, the site verification work brings certain risks to the safety of site personnel and the stable operation of a power grid; the high frequency of the on-site work is also high in manpower, material resources and time consumption, and the cost is relatively high.
The invention provides a remote electric energy meter fault detection and identification system, which selects a proper reference value according to temperature and humidity signals actually checked on site, collects relevant detection information on the basis of electric energy meter data collection, and can perform more detailed and accurate evaluation on the operation condition of an electric energy meter so as to ensure the reliability and accuracy of electric energy meter measurement.
Disclosure of Invention
The invention provides a remote electric energy meter fault detection and identification system which can identify an abnormal electric energy meter and improve the accuracy of electric energy metering.
The invention particularly relates to a remote electric energy meter fault detection and identification system which comprises an electric energy meter information acquisition unit, a detection information acquisition unit, a signal conditioning unit, a control processing unit, a display unit, an alarm unit and a communication unit, wherein the detection information acquisition unit is sequentially connected with the signal conditioning unit and the control processing unit; the electric energy meter fault detection and identification system collects output information and detection information of the electric energy meter, selects proper reference values according to different temperatures and humidity, and further analyzes and judges whether the electric energy meter is abnormal or not and judges the fault type.
The electric meter information acquisition unit is connected with the electric energy meter and directly acquires data of the electric energy meter.
The detection information acquisition unit adopts a second voltage transformer to acquire voltage signals at two ends of a first current transformer, adopts the second current transformer to acquire current signals on the side of a secondary circuit of the first voltage transformer, which is close to the electric energy meter, and adopts a temperature and humidity sensor to acquire temperature signals and humidity signals.
The signal conditioning unit comprises a filtering module and an A/D conversion module, wherein the filtering module filters high-frequency interference signals by adopting a low-pass filter, and the A/D conversion module performs A/D conversion on input signals.
The control processing unit adopts a microprocessor to carry out intelligent analysis control on the electric energy meter fault detection and identification system:
judging whether the temperature signal is greater than a temperature alarm value, if so, controlling the alarm unit to give an alarm and controlling the display unit to display high-temperature alarm information;
judging whether the humidity signal is greater than a humidity alarm value, if so, controlling the alarm unit to give an alarm and controlling the display unit to display humidity high alarm information;
the control processing unit selects a proper reference value according to the temperature signal and the humidity signal, and carries out comparison and judgment:
calculating the phase difference between the voltage signal and the current signal, judging whether the phase difference is greater than a phase difference reference value, if so, controlling the alarm unit to give an alarm, and controlling the phase difference alarm information to be displayed, wherein the wiring is possibly abnormal;
calculating the impedance Z of the secondary loop of the first current transformerLA＝UNA/INA，UNAVoltage signals collected for the second voltage transformer, INAJudging whether the impedance of a secondary circuit of the first current transformer is larger than the impedance reference value of the first current transformer or not for the rated output current of the first current transformer, if so, controlling the alarm unit to give an alarm, and controlling the display unit to display high-impedance alarm and specific alarm information of the current transformer;
calculating the impedance Z of the secondary loop of the first voltage transformerLV＝UNV/INV，UNVFor a nominal output voltage of said first voltage transformer, INVJudging whether the impedance of a secondary circuit of the first voltage transformer is larger than an impedance reference value of the voltage transformer for a current signal acquired by the second current transformer, if so, controlling the alarm unit to give an alarm, and controlling the display unit to display high-impedance alarm and specific alarm information of the voltage transformer;
controlling the first current transformer to collect each phase current signal at a certain moment, adding each phase current signal, judging whether the added sum of each phase current signal is greater than each phase current signal and a reference value, if so, controlling the alarm unit to give an alarm, and controlling the display unit to display that the internal current of the first current transformer is abnormally converted;
controlling the first voltage transformer to collect each phase voltage signal at a certain moment, adding each phase voltage signal, judging whether the sum of the added phase voltage signals is greater than each phase voltage signal and a reference value, if so, controlling the alarm unit to give an alarm, and controlling the display unit to display that the internal voltage of the first voltage transformer is abnormally converted;
calculating the change rate of the power factor, judging whether the change rate of the power factor is greater than a reference value of the change rate of the power factor, if so, controlling the alarm unit to give an alarm, and controlling the display unit to display the abnormity of a secondary metering current loop and a secondary metering voltage loop of the electric energy meter.
The alarm unit adopts an audible and visual alarm, and when the electric energy meter is abnormal, an alarm can be given out in time.
And the communication unit uploads the detection information of the electric energy meter fault detection and identification system to a metering monitoring center by adopting a wireless communication technology.
Compared with the prior art, the beneficial effects are: the electric energy meter fault detection and identification system collects output information and detection information of the electric energy meter, selects proper reference values according to different temperatures and humidity, and further analyzes and judges whether the electric energy meter is abnormal or not and the fault type, so that the economy and feasibility of the fault detection and identification system are ensured, and the accuracy of electric energy metering is improved.
Drawings
Fig. 1 is a schematic structural diagram of a remote electric energy meter fault detection and identification system according to the present invention.
Detailed Description
The following describes in detail a specific embodiment of the remote electric energy meter fault detection and identification system according to the present invention with reference to the accompanying drawings.
As shown in fig. 1, the electric energy meter fault detection and identification system of the present invention includes an electric energy meter information acquisition unit, a detection information acquisition unit, a signal conditioning unit, a control processing unit, a display unit, an alarm unit, and a communication unit, wherein the detection information acquisition unit is sequentially connected to the signal conditioning unit and the control processing unit, and the control processing unit is further connected to the electric energy meter information acquisition unit, the display unit, the alarm unit, and the communication unit, respectively.
The electric meter information acquisition unit is connected with the electric energy meter and directly acquires data of the electric energy meter, wherein the data comprise current signals, voltage signals, active power, reactive power, power factors and the like.
The detection information acquisition unit acquires voltage signals at two ends of the first current transformer by adopting a second voltage transformer, acquires current signals on the side, close to the electric energy meter, of the secondary circuit of the first voltage transformer by adopting the second current transformer, and acquires temperature signals and humidity signals by adopting a temperature and humidity sensor; the first current transformer is a metering current transformer, and the first voltage transformer is a metering voltage transformer.
The signal conditioning unit comprises a filtering module and an A/D conversion module, wherein the filtering module filters high-frequency interference signals by adopting a low-pass filter, and the A/D conversion module performs A/D conversion on input signals.
The control processing unit adopts a microprocessor to carry out intelligent analysis control on the electric energy meter fault detection and identification system, selects a proper reference value according to the temperature signal and the humidity signal, and carries out comparison and judgment:
judging whether the temperature signal is greater than a temperature alarm value, if so, controlling the alarm unit to give an alarm and controlling the display unit to display high-temperature alarm information;
judging whether the humidity signal is greater than a humidity alarm value, if so, controlling the alarm unit to give an alarm and controlling the display unit to display humidity high alarm information;
calculating the phase difference between the voltage signal and the current signal, judging whether the phase difference is greater than a phase difference reference value, if so, controlling the alarm unit to give an alarm, controlling the phase difference alarm information to be displayed, and further checking if the wiring is possibly abnormal;
calculating the impedance Z of the secondary loop of the first current transformer by adopting a voltammetry methodLA＝UNA/INA，UNAVoltage signals collected for the second voltage transformer, INAJudging whether the impedance of a secondary circuit of the first current transformer is larger than the impedance reference value of the first current transformer or not for the rated output current of the first current transformer, if so, controlling the alarm unit to give an alarm, and controlling the display unit to display high-impedance alarm and specific alarm information of the current transformer;
calculating the impedance Z of the secondary loop of the first voltage transformer by adopting an impedance measurement methodLV＝UNV/INV，UNVFor a nominal output voltage of said first voltage transformer, INVJudging whether the impedance of a secondary circuit of the first voltage transformer is larger than an impedance reference value of the voltage transformer for a current signal acquired by the second current transformer, if so, controlling the alarm unit to give an alarm, and controlling the display unit to display high-impedance alarm and specific alarm information of the voltage transformer;
controlling the first current transformer to collect each phase current signal at a certain moment, adding each phase current signal, judging whether the added sum of each phase current signal is greater than each phase current signal and a reference value, if so, controlling the alarm unit to give an alarm, and controlling the display unit to display that the internal current of the first current transformer is abnormally converted;
controlling the first voltage transformer to collect each phase voltage signal at a certain moment, adding each phase voltage signal, judging whether the sum of the added phase voltage signals is greater than each phase voltage signal and a reference value, if so, controlling the alarm unit to give an alarm, and controlling the display unit to display that the internal voltage of the first voltage transformer is abnormally converted;
calculating the change rate of the power factor, judging whether the change rate of the power factor is greater than a reference value of the change rate of the power factor, if so, controlling the alarm unit to give an alarm, and controlling the display unit to display the abnormity of a secondary metering current loop and a secondary metering voltage loop of the electric energy meter;
and controlling the communication unit to upload the detection information of the electric energy meter fault detection and identification system to a metering monitoring center.
The alarm unit adopts an audible and visual alarm, and when the electric energy meter is abnormal, audible and visual alarm can be timely sent out.
And the communication unit uploads the detection information of the electric energy meter fault detection and identification system to the metering monitoring center by adopting a wireless communication technology.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the same. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (7)
1. A remote electric energy meter fault detection and identification system is characterized by comprising an electric energy meter information acquisition unit, a detection information acquisition unit, a signal conditioning unit, a control processing unit, a display unit, an alarm unit and a communication unit, wherein the detection information acquisition unit is sequentially connected with the signal conditioning unit and the control processing unit, and the control processing unit is also respectively connected with the electric energy meter information acquisition unit, the display unit, the alarm unit and the communication unit; the electric energy meter fault detection and identification system collects output information and detection information of the electric energy meter, selects proper reference values according to different temperatures and humidity, and further analyzes and judges whether the electric energy meter is abnormal or not and judges the fault type.
2. The system of claim 1, wherein the meter information collection unit is connected to the electric energy meter and directly collects data of the electric energy meter.
3. The system according to claim 2, wherein the detection information acquisition unit acquires voltage signals at two ends of the first current transformer by using the second voltage transformer, acquires current signals at a side of the secondary circuit of the first voltage transformer, which is close to the electric energy meter, by using the second current transformer, and acquires temperature signals and humidity signals by using the temperature and humidity sensor.
4. The remote electric energy meter fault detection and identification system according to claim 3, wherein the signal conditioning unit comprises a filtering module and an A/D conversion module, the filtering module adopts a low-pass filter to filter out high-frequency interference signals, and the A/D conversion module performs A/D conversion on input signals.
5. The remote electric energy meter fault detection and identification system according to claim 4, wherein the control processing unit adopts a microprocessor to perform intelligent analysis control on the electric energy meter fault detection and identification system:
judging whether the temperature signal is greater than a temperature alarm value, if so, controlling the alarm unit to give an alarm and controlling the display unit to display high-temperature alarm information;
and judging whether the humidity signal is greater than a humidity alarm value, if so, controlling the alarm unit to give an alarm and controlling the display unit to display humidity high alarm information.
6. The system for detecting and identifying the fault of the remote electric energy meter according to claim 5, wherein the control processing unit selects a proper reference value according to the temperature signal and the humidity signal, and performs comparison and judgment:
calculating the phase difference between the voltage signal and the current signal, judging whether the phase difference is greater than a phase difference reference value, if so, controlling the alarm unit to give an alarm, and controlling the phase difference alarm information to be displayed;
calculating the impedance Z of the secondary loop of the first current transformerLA＝UNA/INA，UNAVoltage signals collected for the second voltage transformer, INAJudging whether the impedance of a secondary circuit of the first current transformer is larger than the impedance reference value of the first current transformer or not for the rated output current of the first current transformer, if so, controlling the alarm unit to give an alarm, and controlling the display unit to display high-impedance alarm and specific alarm information of the current transformer;
calculating the impedance Z of the secondary loop of the first voltage transformerLV＝UNV/INV，UNVFor a nominal output voltage of said first voltage transformer, INVJudging whether the impedance of the secondary loop of the first voltage transformer is larger than the impedance of the voltage transformer for the current signal acquired by the second current transformerIf so, controlling the alarm unit to give an alarm and controlling the display unit to display a high-impedance alarm and specific alarm information of the voltage transformer;
controlling the first current transformer to collect each phase current signal at a certain moment, adding each phase current signal, judging whether the added sum of each phase current signal is greater than each phase current signal and a reference value, if so, controlling the alarm unit to give an alarm, and controlling the display unit to display that the internal current of the first current transformer is abnormally converted;
controlling the first voltage transformer to collect each phase voltage signal at a certain moment, adding each phase voltage signal, judging whether the sum of the added phase voltage signals is greater than each phase voltage signal and a reference value, if so, controlling the alarm unit to give an alarm, and controlling the display unit to display that the internal voltage of the first voltage transformer is abnormally converted;
calculating the change rate of the power factor, judging whether the change rate of the power factor is greater than a reference value of the change rate of the power factor, if so, controlling the alarm unit to give an alarm, and controlling the display unit to display the abnormity of a secondary metering current loop and a secondary metering voltage loop of the electric energy meter.
7. The system for detecting and identifying the faults of the remote electric energy meter as claimed in claim 6, wherein the alarm unit adopts an audible and visual alarm, and can give an alarm in time when the electric energy meter is abnormal; and the communication unit uploads the detection information of the electric energy meter fault detection and identification system to a metering monitoring center by adopting a wireless communication technology.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN118011307A (en) * | 2024-04-08 | 2024-05-10 | 中电装备山东电子有限公司 | Electric energy meter fault data monitoring system and data storage medium |
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