CN108152782B - Method for testing correction coefficient of high-supply high-count electric energy meter - Google Patents

Method for testing correction coefficient of high-supply high-count electric energy meter Download PDF

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CN108152782B
CN108152782B CN201711269140.9A CN201711269140A CN108152782B CN 108152782 B CN108152782 B CN 108152782B CN 201711269140 A CN201711269140 A CN 201711269140A CN 108152782 B CN108152782 B CN 108152782B
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meter
supply
electric energy
energy meter
standard
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CN108152782A (en
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霍秀平
马玥
刘璐
张岩
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State Grid Corp of China SGCC
Training Center of State Grid Hebei Electric Power Co Ltd
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State Grid Corp of China SGCC
Training Center of State Grid Hebei Electric Power Co Ltd
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R35/00Testing or calibrating of apparatus covered by the other groups of this subclass
    • G01R35/04Testing or calibrating of apparatus covered by the other groups of this subclass of instruments for measuring time integral of power or current

Abstract

The application belongs to the technical field of power measurement and discloses a method for testing correction coefficients of a high-power-supply high-count electric energy meter. The method for testing the correction coefficient of the high-supply high-count electric energy meter comprises the following steps: connecting a standard meter and the high-supply high-count electric energy meter in parallel into a high-voltage power supply loop where the high-supply high-count electric energy meter is located; respectively reading the readings of the standard meter and the high power supply and high metering electric energy meter under the same working scene; and obtaining a correction coefficient of the high supply and high meter electric energy meter according to the number of the standard meter and the number of the high supply and high meter electric energy meter. The problem of measurement result distortion of the high-supply and high-count electric energy meter caused by voltage loss and current phase error is solved through the obtained correction coefficient.

Description

Method for testing correction coefficient of high-supply high-count electric energy meter
Technical Field
The application belongs to the technical field of power measurement, and particularly relates to a method for testing correction coefficients of a high-power-supply high-count electric energy meter.
Background
The high-power-supply high-metering electric energy meter is applied to high-voltage network management nodes of a transformer room and the like, meets the requirement of electric power management metering electric quantity capacity, reduces the influence of electric loss on electric power metering, has small metering management workload and high controllability, and can effectively prevent users from stealing electricity.
However, after a voltage loss fault such as phase loss occurs in a voltage loop of the high-voltage supply and high-count electric energy meter, due to the influence of the operation environment and working condition of equipment, the performance difference of electric energy meters of different manufacturers and models and the like, the situation of virtual connection or poor contact and the like easily occurs, and the problem of measurement result distortion of the high-voltage supply and high-count electric energy meter caused by voltage loss and current phase errors is caused.
Disclosure of Invention
In view of this, the present disclosure provides a method for testing a correction coefficient of an electric energy meter with high voltage supply and high voltage consumption, so as to solve the problem of measurement result distortion caused by voltage loss and current phase error of the electric energy meter with high voltage supply and high voltage consumption.
The first aspect of the embodiment of the present application provides a method for testing a correction coefficient of a high supply and high metering electric energy meter, including:
connecting a standard meter and the high-supply high-count electric energy meter in parallel into a high-voltage power supply loop where the high-supply high-count electric energy meter is located;
respectively reading the readings of the standard meter and the high power supply and high metering electric energy meter under the same working scene;
and obtaining a correction coefficient of the high supply and high meter electric energy meter according to the number of the standard meter and the number of the high supply and high meter electric energy meter.
Further, the criteria table includes:
the high-power-supply high-meter electric energy meter and the electric energy meter field calibration instrument have the same manufacturer specification with the high-power-supply high-meter electric energy meter and are subjected to calibration.
Further, the high supply and high count electric energy meter comprises:
the high-supply high-meter three-phase three-wire electric energy meter and the high-supply high-meter three-phase four-wire electric energy meter.
Further, the readings of the standard meter and the high supply and high count electric energy meter under the same working scene comprise:
after the standard meter and the high-supply high-count electric energy meter work for the same time, the measured electric quantity is indicated;
or the standard meter and the high-supply high-meter electric energy meter measure the indication of the electric power at the same time.
Further, the step of connecting the standard meter and the high supply and high meter electric energy meter in parallel into a high voltage power supply loop where the high supply and high meter electric energy meter is located comprises;
and connecting the standard meter and the high-supply high-count electric energy meter in parallel through a joint junction box into a high-voltage power supply loop where the high-supply high-count electric energy meter is located.
Further, the connecting the standard meter and the high power supply high meter electric energy meter in parallel into the high voltage power supply loop where the high power supply high meter electric energy meter is located includes:
acquiring a fault measurement unit of the high-supply high-count electric energy meter;
determining a measurement unit corresponding to the fault measurement unit in the standard table based on the fault measurement unit;
and connecting the measuring unit and the fault measuring unit in parallel into a high-voltage power supply loop where the high-power-supply high-meter electric energy meter is located, and connecting other units except the measuring unit of the standard meter into a three-phase controllable alternating-current power supply.
Further, the three-phase controllable alternating current power supply consists of a standard three-phase alternating current power supply and an adjustable three-phase alternating current power supply.
Further, before reading the readings of the standard meter and the high supply and high count electric energy meter under the same working scene, the method further comprises the following steps:
adjusting the output voltage and the phase of the three-phase controllable alternating current power supply to be consistent with the voltage and the phase of a normal measuring unit of the high-supply high-count electric energy meter;
and forming a closed loop by the adjusted three-phase controllable alternating current power supply and the measuring unit.
Further, the deriving the correction factor of the high supply meter according to the number of the standard meter and the number of the high supply meter comprises:
and confirming the correction coefficient of the high supply and high meter electric energy meter according to the ratio of the number of the standard meter and the number of the high supply and high meter electric energy meter.
Compared with the prior art, the technical scheme of the embodiment of the application has the beneficial effects that:
according to the embodiment of the application, a standard meter and the high-supply high-count electric energy meter are connected in parallel to a high-voltage power supply loop where the high-supply high-count electric energy meter is located; respectively reading the readings of the standard meter and the high power supply and high metering electric energy meter under the same working scene; and obtaining a correction coefficient of the high supply and high meter electric energy meter according to the number of the standard meter and the number of the high supply and high meter electric energy meter. The problem of measurement result distortion of the high-supply and high-count electric energy meter caused by voltage loss and current phase error is solved through the obtained correction coefficient.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
FIG. 1 is a flowchart illustrating an implementation of a method for testing correction coefficients of a high supply and high meter electric energy meter according to an embodiment of the present application;
FIG. 2 is a schematic diagram of a universal electric energy meter junction box according to an embodiment of the present disclosure;
fig. 3 is a schematic diagram of a joint junction box of a split-type electric energy meter according to an embodiment of the present application;
FIG. 4 is a schematic diagram of a metering principle of a high-supply high-meter three-phase three-wire electric energy meter according to an embodiment of the present application;
FIG. 5 is a schematic diagram of a high-supply high-count three-phase four-wire electric energy meter according to an embodiment of the present application;
fig. 6 is a structural diagram of a portable three-phase controllable ac power supply according to an embodiment of the present application.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the present application. It will be apparent, however, to one skilled in the art that the present application may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present application with unnecessary detail.
In order to explain the technical solution described in the present application, the following description will be given by way of specific examples.
Referring to fig. 1, a flowchart of an implementation of a method for testing a correction coefficient of a high supply and high count electric energy meter according to an embodiment of the present application is shown. As shown the method may comprise the steps of:
and S101, connecting a standard meter and the high-power-supply high-meter electric energy meter in parallel into a high-voltage power supply loop where the high-power-supply high-meter electric energy meter is located.
The electric energy meter is used for measuring electric energy and electric power, is also called an electric meter, a fire meter and a kilowatt-hour meter, and is an instrument for measuring various electric quantities.
In the embodiment of the present application, the high-supply high-count electric energy meter may be a high-supply high-count intelligent electric energy meter. The intelligent electric energy meter consists of a measuring unit, a data processing unit, a communication unit and the like, and has the functions of electric energy metering, data processing, real-time monitoring, automatic control, information interaction and the like.
It should be noted that in the case of low voltage (not exceeding 500 volts) and low current (tens of amperes), the electric energy meter can be directly connected to the circuit for measurement. Under the condition of high voltage or large current, the electric energy meter cannot be directly connected to a line and needs to be matched with a voltage transformer or a current transformer for use, for example, the electric energy meter with high power supply and high metering in the embodiment of the application.
The high-supply high-count electric energy meter is an electric energy meter which is measured by a voltage Transformer (PT) and a Current Transformer (CT) on a high-voltage power supply side.
The high-supply high-meter electric energy meter comprises a high-supply high-meter three-phase three-wire electric energy meter and a high-supply high-meter three-phase four-wire electric energy meter.
The standard table includes: the high-power-supply high-meter electric energy meter and the electric energy meter field calibration instrument have the same manufacturer specification with the high-power-supply high-meter electric energy meter and are subjected to calibration.
The verification means that the high-supply high-count electric energy meter prepared as the standard meter is checked and calibrated on main functional components of the high-supply high-count electric energy meter in a detection mechanism or a laboratory with professional inspection qualification according to specified technical performance indexes, and the whole indexes of the high-supply high-count electric energy meter are tested and judged; the standard of the measured indexes generally allows a certain error range, and the requirements of the standard and the error range are higher than the factory qualification test standard of the common electric energy meters of the same type; only the high-supply high-count electric energy meter with all measured indexes meeting the requirements of the indexes and the error range can be used as a standard meter, and the qualification period and the use times of the standard meter as the standard are limited.
The electric energy meter field calibration instrument is a test instrument integrating electric parameter measurement, electric energy meter calibration and wiring judgment. The instrument is provided with a voltage transformer and a current transformer with high precision and high linearity, so that the measurement precision of the instrument on various parameters is very high, and the instrument is provided with a pincerlike current transformer, so that the field wiring is simple and convenient, and the direct access can be realized without disconnecting a current loop.
The electric energy meter field calibrator comprises a three-phase three-wire electric energy meter field calibrator and a three-phase four-wire electric energy meter field calibrator; the electric energy meter on-site calibration instrument and the high-supply high-count electric energy meter are connected in parallel to a high-voltage power supply loop where the high-supply high-count electric energy meter is located, and a specific test method is consistent with that of the standard meter.
The high-voltage power supply loop connecting the standard meter and the high-power-supply high-meter electric energy meter in parallel to the high-power-supply high-meter electric energy meter comprises:
and connecting the standard meter and the high-supply high-count electric energy meter in parallel through a joint junction box into a high-voltage power supply loop where the high-supply high-count electric energy meter is located.
The combined junction box can connect a standard meter into a current secondary circuit of the high-power-supply high-meter electric energy meter in operation, is suitable for joint wiring of electric energy meters with various voltage levels, and particularly connects secondary wires led out by a mutual inductor to wiring terminals of the high-power-supply high-meter electric energy meter after the secondary wires are connected in series through the wiring terminals of the combined junction box.
The standard installation and correct wiring of the combined junction box are the basis for ensuring the accurate comparison test of the standard table.
The combined junction box comprises a universal type electric energy meter combined junction box and a split type electric energy meter combined junction box.
The universal type electric energy meter combined junction box and the column type electric energy meter combined junction box can finish combined wiring of two three-phase three-wire electric energy meters or two three-phase four-wire electric energy meters.
Fig. 2 is a schematic view of a universal electric energy meter junction box according to an embodiment of the present application.
The current and voltage wiring terminals of the universal electric energy meter combined wiring box are respectively arranged according to the electric phases, and the N-phase voltage wiring terminal required by the three-phase four-wire connection method is arranged at the rightmost side.
Fig. 3 is a schematic view of a joint junction box of a split-type electric energy meter according to an embodiment of the present application.
The current wiring terminals and the voltage wiring terminals of the combined wiring box of the split type electric energy meter are respectively arranged in a concentrated mode corresponding to electric phases, and the N-phase voltage wiring terminals required by the three-phase four-wire connection method are arranged on the rightmost side.
In the embodiment of the application, the electric energy meter combined junction box mostly adopts the block-type electric energy meter combined junction box, and the current wiring terminals and the voltage wiring terminals of the block-type electric energy meter combined junction box are respectively arranged corresponding to the electric phases in a concentrated manner, so that the wiring of current and voltage cannot be confused, the wiring can be easily distinguished, and the wiring accuracy is improved.
And S102, reading the readings of the standard meter and the high power supply and high metering electric energy meter under the same working scene respectively.
In the embodiment of the present invention, the high power supply and high meter electric energy meter may measure not only electric energy but also power, so that the readings of the standard meter and the high power supply and high meter electric energy meter in the same working scene include:
after the standard meter and the high-supply high-count electric energy meter work for the same time, the measured electric quantity is indicated;
or the standard meter and the high-supply high-meter electric energy meter measure the indication of the electric power at the same time.
The same working time refers to the same working time measured by the standard meter and the high-voltage power supply loop where the high-voltage power supply high-voltage electric energy meter is connected in parallel. The length of the working time can be determined according to actual test requirements, and the longer the working time is, the more accurate the obtained readings are.
The same time refers to a certain time when the standard meter and the high-supply high-count electric energy meter are connected in parallel to a high-voltage power supply loop where the high-supply high-count electric energy meter is located to normally meter. The same time can be randomly determined according to the actual test requirement.
And S103, obtaining a correction coefficient of the high supply and high meter electric energy meter according to the number of the standard meter and the number of the high supply and high meter electric energy meter.
The step of obtaining the correction coefficient of the high supply meter electric energy meter according to the number of the standard meter and the number of the high supply meter electric energy meter comprises the following steps:
and confirming the correction coefficient of the high supply and high meter electric energy meter according to the ratio of the number of the standard meter and the number of the high supply and high meter electric energy meter.
In particular, the correction coefficient G may be
After the standard meter and the high-power-supply high-meter electric energy meter work for the same time, the standard meter measures the reading W of the electric quantity0And the reading W of the electric quantity measured by the high-supply high-count electric energy meterxThe ratio of (a) to (b).
The correction coefficient G can also be the index P of the electric power measured by the standard brick meter when the standard meter and the high-supply high-meter electric energy meter work at the same time0And the indication P of the electric power measured by the high-supply high-meter electric energy meterxThe ratio of (a) to (b).
In the embodiment of the invention, the correction coefficient can be calculated by the number of the standard meter and the number of the high-supply high-count electric energy meter which are measured at one time; the correction coefficient can also be obtained by calculating the average value of a plurality of correction coefficients obtained by calculating the number of the standard meter and the number of the high-supply high-meter electric energy meter which are measured for a plurality of times.
According to the embodiment of the application, a standard meter and the high-supply high-count electric energy meter are connected in parallel to a high-voltage power supply loop where the high-supply high-count electric energy meter is located; respectively reading the readings of the standard meter and the high power supply and high metering electric energy meter under the same working scene; and obtaining a correction coefficient of the high supply and high meter electric energy meter according to the number of the standard meter and the number of the high supply and high meter electric energy meter. The problem of measurement result distortion of the high-supply and high-count electric energy meter caused by voltage loss and current phase error is solved through the obtained correction coefficient.
As another embodiment of the present application, in the method for testing the correction coefficient of the high supply and high meter electric energy meter, the connecting the standard meter and the high supply and high meter electric energy meter in parallel to the high voltage power supply loop where the high supply and high meter electric energy meter is located further includes:
acquiring a fault measurement unit of the high-supply high-count electric energy meter;
determining a measurement unit corresponding to the fault measurement unit in the standard table based on the fault measurement unit;
and connecting the measuring unit and the fault measuring unit in parallel into a high-voltage power supply loop where the high-power-supply high-meter electric energy meter is located, and connecting other units except the measuring unit of the standard meter into a three-phase controllable alternating-current power supply.
Specifically, the circuit wiring and the metering work of two measuring units of the high-supply high-metering three-phase three-wire electric energy meter are mutually independent; the circuit wiring and the metering work of three measuring units of the high-supply high-meter three-phase four-wire electric energy meter are mutually independent. The high-power-supply high-meter electric energy meter metering fault caused by phase loss and equal voltage loss faults in the high-power-supply high-meter electric energy meter loop can be a fault of a certain measuring unit in the high-power-supply high-meter electric energy meter, or a fault of a plurality of measuring units in the high-power-supply high-meter electric energy meter.
Referring to fig. 4, a metering principle diagram of a high-supply high-meter three-phase three-wire electric energy meter according to an embodiment of the present application is shown.
The high-supply high-meter three-phase three-wire electric energy meter adopts a three-phase three-wire system for measurement, specifically, two measuring elements (units) are used for realizing the measurement of a three-phase line, namely two ammeters (connected in series between A, C two phases), two voltmeters (respectively connected in parallel between AB and CB) and two power meters (current coils are connected in series between A, C phases, and voltage coils are connected in parallel between AB and CB) are respectively connected into a circuit; the combination of the ammeter Ia, the power meter Pa and the voltmeter Uab is equivalent to a first measuring unit of the high-supply high-meter three-phase three-wire electric energy meter, and the combination of the ammeter Ic, the power meter Pc and the voltmeter Ucb is equivalent to a second measuring unit of the high-supply high-meter three-phase three-wire electric energy meter; the metering work of the first measuring unit and the metering work of the second measuring unit are mutually independent, and the measurement readings of the high-supply high-meter three-phase three-wire electric energy meter are the weighting of the metering results of the first measuring unit and the second measuring unit.
Referring to fig. 5, a metering principle diagram of a high-voltage supply and high-voltage meter three-phase four-wire electric energy meter according to an embodiment of the present application is shown.
The high-power-supply high-meter three-phase four-wire electric energy meter adopts a three-phase four-wire system for measurement, particularly three measuring elements (units) are used for realizing the measurement of a three-phase line, namely three ammeters (respectively connected in series with A, B, C three phases), three voltmeters (respectively connected in parallel between A, B, C opposite N phases) and three power meters (current coils are respectively connected in series with A, B, C phases, and voltage coils are respectively connected in parallel between A, B, C pairs of N phases) are respectively connected into a circuit; the combination of the ammeter Ia, the power meter Pa and the voltmeter Ua is equivalent to a first measuring unit of the high-supply high-meter three-phase four-wire electric energy meter, the combination of the ammeter Ib, the power meter Pb and the voltmeter Ub is equivalent to a second measuring unit of the high-supply high-meter three-phase four-wire electric energy meter, and the combination of the ammeter Ic, the power meter Pc and the voltmeter Uc is equivalent to a third measuring unit of the high-supply high-meter three-phase four-wire electric energy meter; the metering work of the first measuring unit, the metering work of the second measuring unit and the metering work of the third measuring unit are mutually independent, and the measurement index of the high-supply high-meter three-phase four-wire electric energy meter is the weighting of the metering results of the first measuring unit, the second measuring unit and the third measuring unit.
The three-phase controllable alternating current power supply consists of a standard three-phase alternating current power supply and an adjustable three-phase alternating current power supply.
Fig. 6 is a structural diagram of a portable three-phase controllable ac power supply according to an embodiment of the present application.
The portable three-phase controllable alternating current power supply comprises two parts, namely a portable standard three-phase alternating current power supply and an adjustable three-phase alternating current power supply.
The portable standard three-phase alternating current power supply inverts a direct current power supply provided by a portable lithium battery into three-phase alternating current with voltage of 50Hz and 100V.
The adjustable three-phase alternating current power supply can perform voltage stabilization and filtering on three-phase alternating current with voltage of 50Hz and 100V obtained by direct current inversion of the portable standard three-phase alternating current power supply, output the 100V or 57.7V alternating current power supply, and can perform phase modulation on the output power supply voltage according to output requirements.
Specifically, the 100V ac power supply supplies the high-voltage-supply high-meter three-phase three-wire electric energy meter, and the 57.7V ac power supply supplies the high-voltage-supply high-meter three-phase four-wire electric energy meter.
Before reading the readings of the standard meter and the high supply and high count electric energy meter under the same working scene respectively, the method further comprises the following steps:
adjusting the output voltage and the phase of the three-phase controllable alternating current power supply to be consistent with the voltage and the phase of a normal measuring unit of the high-supply high-count electric energy meter;
and forming a closed loop by the adjusted three-phase controllable alternating current power supply and the measuring unit.
Before the high-power-supply high-meter electric energy meter is connected into a standard meter voltage loop, the voltage electrical phase output by the portable three-phase controllable alternating current power supply is adjusted to be consistent with the voltage electrical phase of the normal measurement unit of the high-power-supply high-meter electric energy meter, and the adjusted three-phase power supply is connected into measurement loops of other units corresponding to the normal measurement unit in the standard meter.
Specifically, the voltage electric phase output by the three-phase controllable alternating current power supply is adjusted to be consistent with the voltage electric phase of the normal measuring unit of the high-voltage supply high-voltage meter, so that the output voltage of the controllable three-phase alternating current power supply can accurately simulate the working state of the normal measuring unit of the high-voltage supply high-voltage meter, the three-phase power supply completing the voltage electric phase adjustment is connected in series to other unit loops corresponding to the normal measuring unit in the standard meter, the target measuring unit is connected with the fault unit of the high-voltage supply high-voltage meter in parallel to be connected to the high-voltage power supply loop where the high-voltage supply high-voltage meter is located, and the comparison and measurement are completed.
In another embodiment of the present application, based on the embodiment shown in fig. 1, a three-phase power supply that is adjusted to be electrically consistent with the voltage of the normal measurement unit of the high supply and high count electric energy meter is connected to the measurement unit loop corresponding to the voltage of the standard meter, and then the comparison and measurement are continued to determine the correction coefficient. The standard meter is connected to a three-phase controllable alternating current power supply through voltage regulation and phase modulation, elements of a normal measuring unit of the high-voltage supply and high-voltage meter are isolated, correction coefficients obtained by measuring the standard meter and the high-voltage supply and high-voltage meter are more accurate and stable, the standard meter is particularly suitable for metering and processing of high-voltage non-current loop faults, the correction coefficients can be accurately obtained no matter whether a fault unit and a normal unit are symmetrical, and the standard meter has great guiding value for solving the problems of metering management distortion of the high-voltage supply and high-voltage meter and electric charge pursuing work of users after faults occur.
It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.

Claims (8)

1. A method for testing the correction coefficient of an electric energy meter with high power supply and high metering is characterized by comprising the following steps:
connecting a standard meter and the high-supply high-count electric energy meter in parallel into a high-voltage power supply loop where the high-supply high-count electric energy meter is located; the high-voltage power supply loop connecting the standard meter and the high-power-supply high-meter electric energy meter in parallel to the high-power-supply high-meter electric energy meter comprises: acquiring a fault measurement unit of the high-supply high-count electric energy meter; determining a measurement unit corresponding to the fault measurement unit in the standard table based on the fault measurement unit; connecting the measuring unit and the fault measuring unit in parallel to a high-voltage power supply loop where the high-power-supply high-meter electric energy meter is located, and connecting other units except the measuring unit of the standard meter to a three-phase controllable alternating-current power supply;
respectively reading the readings of the standard meter and the high power supply and high metering electric energy meter under the same working scene;
and obtaining a correction coefficient of the high supply and high meter electric energy meter according to the number of the standard meter and the number of the high supply and high meter electric energy meter.
2. The method for testing the correction coefficient of an electric energy meter for high supply and high counter according to claim 1, wherein the standard meter comprises:
the high-power-supply high-meter electric energy meter and the electric energy meter field calibration instrument have the same manufacturer specification with the high-power-supply high-meter electric energy meter and are subjected to calibration.
3. The method for testing the correction factor of an electric energy meter for high supply and high meter according to claim 1, wherein the electric energy meter for high supply and high meter comprises:
the high-supply high-meter three-phase three-wire electric energy meter and the high-supply high-meter three-phase four-wire electric energy meter.
4. The method for testing the correction coefficient of the high supply and high meter electric energy meter according to claim 1, wherein the indication numbers of the standard meter and the high supply and high meter electric energy meter under the same working scene comprise:
after the standard meter and the high-supply high-count electric energy meter work for the same time, the measured electric quantity is indicated;
or the standard meter and the high-supply high-meter electric energy meter measure the indication of the electric power at the same time.
5. The method for testing the correction coefficient of the high supply and high meter electric energy meter according to claim 1, wherein the step of connecting the standard meter and the high supply and high meter electric energy meter in parallel to the high voltage power supply loop where the high supply and high meter electric energy meter is located comprises;
and connecting the standard meter and the high-supply high-count electric energy meter in parallel through a joint junction box into a high-voltage power supply loop where the high-supply high-count electric energy meter is located.
6. The method for testing the correction coefficient of a high supply and high meter electric energy meter according to claim 1, wherein the three-phase controllable ac power supply comprises a standard three-phase ac power supply and an adjustable three-phase ac power supply.
7. The method for testing the correction coefficient of the high supply and high meter electric energy meter according to claim 6, before reading the readings of the standard meter and the high supply and high meter electric energy meter under the same working scenario respectively, further comprising:
adjusting the output voltage and the phase of the three-phase controllable alternating current power supply to be consistent with the voltage and the phase of a normal measuring unit of the high-supply high-count electric energy meter;
and forming a closed loop by the adjusted three-phase controllable alternating current power supply and the measuring unit.
8. The method for testing the correction coefficient of the high supply and high meter electric energy meter according to claim 1, wherein the deriving the correction coefficient of the high supply and high meter electric energy meter according to the indication of the standard meter and the indication of the high supply and high meter electric energy meter comprises:
and confirming the correction coefficient of the high supply and high meter electric energy meter according to the ratio of the number of the standard meter and the number of the high supply and high meter electric energy meter.
CN201711269140.9A 2017-12-05 2017-12-05 Method for testing correction coefficient of high-supply high-count electric energy meter Active CN108152782B (en)

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