CN113325360A - Comprehensive error testing device and method for electric energy meter - Google Patents
Comprehensive error testing device and method for electric energy meter Download PDFInfo
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- CN113325360A CN113325360A CN202110602719.2A CN202110602719A CN113325360A CN 113325360 A CN113325360 A CN 113325360A CN 202110602719 A CN202110602719 A CN 202110602719A CN 113325360 A CN113325360 A CN 113325360A
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Abstract
The invention discloses a comprehensive error testing device and a method of an electric energy meter, belonging to the technical field of electric energy meter testing, wherein the comprehensive error testing device of the electric energy meter comprises a workbench, a three-phase standard power meter, a standard electric energy meter, a temperature controller and an electric energy meter to be tested, a placing groove is formed in the middle of the workbench, a fixing component is arranged in the placing groove, the electric energy meter to be tested can be temporarily fixed in the fixing component, the three-phase standard power meter and the standard electric energy meter are both fixed on the workbench through screws, the temperature controller is fixed on one side of the workbench, and the three-phase standard power meter, the standard electric energy meter and the electric energy meter to be tested are connected through electric leads; the testing method combines the phase shift error and the synthetic error of the standard electric energy meter to calculate the integral error, provides an error calculating method, reduces the influence of irrelevant variables in the testing process and improves the accuracy of integral testing.
Description
Technical Field
The invention belongs to the technical field of electric energy meter testing, and particularly relates to a comprehensive error testing device and method for an electric energy meter.
Background
In order to ensure accurate and reliable metering of electric energy, the current electric energy meter related standards stipulate various influence quantity tests, such as: harmonic shadow test, voltage fluctuation test, frequency change test, three-phase unbalance test, temperature test, magnetic field test and the like. However, under the actual operation condition of the electric energy meter on site, all influence quantities often exist at the same time, and the metering performance of the electric energy meter under the complex condition on site cannot be comprehensively examined only by carrying out a single influence quantity test on the electric energy meter in a laboratory. In order to evaluate the metering performance of the electric energy meter under the combined action of multiple influence quantities, the OIML R46 provides a comprehensive error testing method of the electric energy meter under the condition of assuming that the influence quantities are mutually independent. However, in actual operation conditions, the influence quantities are not completely independent, and for a three-phase electric energy meter, voltage fluctuation may cause three-phase imbalance. The correlation of voltage fluctuation and three-phase imbalance can cause repeated calculation, and the metering performance of the electric energy meter under the combined action of multiple influence quantities cannot be accurately evaluated by adopting the test method.
Disclosure of Invention
The invention aims to provide a comprehensive error testing device and method for an electric energy meter.
In order to achieve the purpose, the invention provides the following technical scheme: the comprehensive error testing device of the electric energy meter comprises a workbench, a three-phase standard power meter, a standard electric energy meter, a temperature controller and an electric energy meter to be tested, wherein a placing groove is formed in the middle of the workbench, a fixing assembly is arranged in the placing groove, the electric energy meter to be tested can be temporarily fixed in the fixing assembly, the three-phase standard power meter and the standard electric energy meter are fixed on the workbench through screws, the temperature controller is fixed on one side of the workbench, and the three-phase standard power meter, the standard electric energy meter and the electric energy meter to be tested are connected through electric leads.
Preferably, the fixing assembly comprises springs fixed at four corners of the placing groove, angular plates are fixed at the ends, far away from the wall of the placing groove, of the springs, and the four angular plates can be clamped around the electric energy meter to be tested.
Preferably, a fixing plate is further fixed on the workbench, the fixing plate is semicircular, and the fixing plate is used for penetrating the electric leads.
The invention also provides a comprehensive error testing method of the electric energy meter, which is used for testing by using the comprehensive error testing device of the electric energy meter and specifically comprises the following steps:
the method comprises the following steps: testing the voltage loop once, connecting the A0 phase with the 100/3V terminal of the standard electric energy meter in parallel, and connecting the C0 phase of the voltage loop once with the 100/3V terminal of the electric energy meter in parallel;
step two: an ac phase is led out from the upper end of a standard electric energy meter wiring terminal of a tester voltage loop secondary line and is connected into a three-phase standard power meter, and a 100-volt terminal is connected into a mutual inductor calibrator on the side of the three-phase standard power meter; when the primary side of a voltage loop is connected with the c0 phase, the bc phase is led out from the upper end of a connecting terminal of the secondary side strain standard electric energy meter and is connected with a mutual inductor calibration instrument, and the secondary side connection mode of the three-phase standard power meter is the same as the ac phase;
step three: opening the electric energy meter to be tested, checking a primary phase sequence and a secondary phase sequence, wherein the checking of the primary phase sequence and the secondary phase sequence can be carried out by referring to the checking of the phase sequence meter, the checking of the primary phase sequence and the secondary phase sequence corresponds to the primary phase sequence, and a secondary lead A, B, c is connected into the TG type phase sequence meter from the upper end of an incoming terminal of the standard electric energy meter;
step four: and (3) raising the three-phase positive sequence balanced symmetrical test voltage to a rated value, wherein the unbalance degree of the test power supply is required to be not more than 2%, and the asymmetry degree is not more than 5%.
Step five: according to the test requirements, the rated voltages of 85%, 10% and 115% can be respectively taken, and the primary side U is measured by a mutual inductor calibrator in pointsA0Secondary side connected with UacSpecific difference of (e)acAngle difference deltaac(ii) a After the test is finished, the primary side is connected with Uc0Secondary side connected with UacRepeating the above method to determine Uc0Specific difference of (e)bcAngle difference deltabc；
Step six: calculating the error, wherein the error is not more than 1%.
Preferably, the error calculation comprises the steps of:
firstly, calculating a phase shift error:
calculated as%;
secondly, calculating the synthesis error of the standard electric energy meter:
calculated as%;
thirdly, calculating the overall error: e ═ e-Moving device+εwCalculated as%.
The invention has the beneficial effects that:
1. the comprehensive error testing device of the electric energy meter is characterized in that a fixing assembly is arranged and comprises springs fixed at four corners of the placing groove, angular plates are fixed at the ends, far away from the wall of the placing groove, of the springs, and the four angular plates can be clamped around the electric energy meter to be tested; carry out all around the electric energy meter that awaits measuring through the centre gripping of angle template and fix the electric energy meter that awaits measuring, guarantee in the testing process, the stability of electric energy meter that awaits measuring, the spring can be followed to the angle template simultaneously and the shrink roll-off can be held the not unidimensional electric energy meter that awaits measuring.
2. According to the comprehensive error testing device of the electric energy meter, a fixing plate is further fixed on a workbench, the fixing plate is semicircular, and the inner part of the fixing plate is used for penetrating through the electric leads; the conductor wires on the workbench are convenient to arrange and sum up, the messy conductor wires are prevented, and the testing work efficiency is improved.
3. The comprehensive error testing method of the electric energy meter combines the phase shift error and the synthetic error of the standard electric energy meter to calculate the integral error, provides an error calculating method, reduces the influence of irrelevant variables in the testing process and improves the accuracy of the integral test.
Drawings
FIG. 1 is a schematic structural diagram of a comprehensive error testing device of an electric energy meter provided by the invention;
fig. 2 is a schematic structural diagram of a comprehensive error testing method of an electric energy meter provided by the invention.
In the figure: 1. a work table; 2. a three-phase standard power meter; 3. a standard electric energy meter; 4. a temperature controller; 5. an electric energy meter to be tested; 6. a placement groove; 7. a fixing assembly; 8. an electrical lead; 9. a spring; 10. an angle plate; 11. and (7) fixing the plate.
Detailed Description
In order to further understand the contents, features and effects of the present invention, the following embodiments are illustrated and described in detail with reference to the accompanying drawings.
Referring to fig. 1 to fig. 2, a comprehensive error testing apparatus and method for an electric energy meter according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.
This comprehensive error testing arrangement of electric energy meter includes workstation 1, three-phase standard power meter 2, standard electric energy meter 3, temperature controller 4, the electric energy meter 5 that awaits measuring, standing groove 6 has been seted up to 1 middle part position of workstation, and standing groove 6 is inside to be equipped with fixed subassembly 7, and fixed subassembly 7 is inside can be fixed temporarily electric energy meter 5 that awaits measuring, three-phase standard power meter 2 and the equal screw fixation of standard electric energy meter 3 are in on the workstation 1, temperature controller 4 is fixed in workstation 1 one side, three-phase standard power meter 2, standard electric energy meter 3 are connected through electric lead 8 with the electric energy meter 5 that awaits measuring.
Specifically, fixed subassembly 7 is including fixing the spring 9 of 6 four corners of standing groove, spring 9 keep away from 6 cell wall ends of standing groove and fix angled template 10, but four angular template 10 centre grippings are around the electric energy meter 5 that awaits measuring.
Specifically, the workbench 1 is further fixed with a fixing plate 11, the fixing plate 11 is semicircular, and the fixing plate 11 is used for passing through the electric lead 8.
In the above embodiment, when the test of electric energy meter, through placing electric energy meter 5 that awaits measuring inside standing groove 6, when placing, four angle template 10 will await measuring electric energy meter 5 centre gripping is fixed, and after the fixed completion, with electric lead 8 according to the mode of connection among the test method, the wiring, when the wiring, pass electric lead 8 along fixed plate 11 insidely, connect.
The comprehensive error testing method of the electric energy meter uses the comprehensive error testing device of the electric energy meter to test, and specifically comprises the following steps:
the method comprises the following steps: testing the voltage loop once, connecting the A0 phase with the 100/3V terminal of the standard electric energy meter in parallel, and connecting the C0 phase of the voltage loop once with the 100/3V terminal of the electric energy meter in parallel;
step two: an ac phase is led out from the upper end of a standard electric energy meter wiring terminal of a tester voltage loop secondary line and is connected into a three-phase standard power meter, and a 100-volt terminal is connected into a mutual inductor calibrator on the side of the three-phase standard power meter; when the primary side of a voltage loop is connected with the c0 phase, the bc phase is led out from the upper end of a connecting terminal of the secondary side strain standard electric energy meter and is connected with a mutual inductor calibration instrument, and the secondary side connection mode of the three-phase standard power meter is the same as the ac phase;
step three: opening the electric energy meter to be tested, checking a primary phase sequence and a secondary phase sequence, wherein the checking of the primary phase sequence and the secondary phase sequence can be carried out by referring to the checking of the phase sequence meter, the checking of the primary phase sequence and the secondary phase sequence corresponds to the primary phase sequence, and a secondary lead A, B, c is connected into the TG type phase sequence meter from the upper end of an incoming terminal of the standard electric energy meter;
step four: and (3) raising the three-phase positive sequence balanced symmetrical test voltage to a rated value, wherein the unbalance degree of the test power supply is required to be not more than 2%, and the asymmetry degree is not more than 5%.
Step five: according to the test requirements, the rated voltages of 85%, 10% and 115% can be respectively taken, and the primary side U is measured by a mutual inductor calibrator in pointsA0Secondary side connected with UacSpecific difference of (e)acAngle difference deltaac(ii) a After the test is finished, the primary side is connected with Uc0Secondary side connected with UacRepeating the above method to determine Uc0Specific difference of (e)bcAngle difference deltabc；
Step six: calculating the error, wherein the error is not more than 1%.
Wherein the error calculation comprises the following steps:
firstly, calculating a phase shift error:
calculated as%;
secondly, calculating the synthesis error of the standard electric energy meter:
calculated as%;
thirdly, calculating the overall error: e ═ e-Moving device+εwCalculated as%.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. The utility model provides an integrated error testing arrangement of electric energy meter, its characterized in that, this electric energy meter's integrated error testing arrangement includes workstation (1), three-phase standard power meter (2), standard electric energy meter (3), temperature controller (4), electric energy meter (5) await measuring, standing groove (6) have been seted up to workstation (1) middle part position, and standing groove (6) inside is equipped with fixed subassembly (7), and fixed subassembly (7) are inside can fix temporarily electric energy meter (5) await measuring, three-phase standard power meter (2) and the equal screw fixation of standard electric energy meter (3) are in on workstation (1), temperature controller (4) are fixed in workstation (1) one side, three-phase standard power meter (2), standard electric energy meter (3) are connected through electric lead (8) with electric energy meter (5) await measuring.
2. The comprehensive error testing device of the electric energy meter is characterized in that the fixing component (7) comprises springs (9) fixed at four corners of the placing groove (6), the springs (9) are fixed with angle-shaped plates (10) far away from the groove wall end of the placing groove (6), and the four angle-shaped plates (10) can be clamped around the electric energy meter (5) to be tested.
3. The comprehensive error testing device of the electric energy meter is characterized in that a fixing plate (11) is further fixed on the workbench (1), the fixing plate (11) is semicircular, and the fixing plate (11) is used for penetrating through the electric lead (8).
4. The comprehensive error testing method of the electric energy meter is characterized in that the comprehensive error testing device of the electric energy meter provided by the claims 1-3 is used for testing, and the method specifically comprises the following steps:
the method comprises the following steps: testing the voltage loop once, connecting the A0 phase with the 100/3V terminal of the standard electric energy meter in parallel, and connecting the C0 phase of the voltage loop once with the 100/3V terminal of the electric energy meter in parallel;
step two: an ac phase is led out from the upper end of a standard electric energy meter wiring terminal of a tester voltage loop secondary line and is connected into a three-phase standard power meter, and a 100-volt terminal is connected into a mutual inductor calibrator on the side of the three-phase standard power meter; when the primary side of a voltage loop is connected with the c0 phase, the bc phase is led out from the upper end of a connecting terminal of the secondary side strain standard electric energy meter and is connected with a mutual inductor calibration instrument, and the secondary side connection mode of the three-phase standard power meter is the same as the ac phase;
step three: opening the electric energy meter to be tested, checking a primary phase sequence and a secondary phase sequence, wherein the checking of the primary phase sequence and the secondary phase sequence can be carried out by referring to the checking of the phase sequence meter, the checking of the primary phase sequence and the secondary phase sequence corresponds to the primary phase sequence, and a secondary lead A, B, c is connected into the TG type phase sequence meter from the upper end of an incoming terminal of the standard electric energy meter;
step four: raising the three-phase positive sequence balance symmetrical test voltage to a rated value, wherein the unbalance degree of the test power supply is required to be not more than 2%, and the asymmetry degree is not more than 5%;
step five: according to the test requirements, the rated voltages of 85%, 10% and 115% can be respectively taken, and the primary side U is measured by a mutual inductor calibrator in pointsA0Secondary side connected with UacSpecific difference of (e)acAngle difference deltaac(ii) a After the test is finished, the primary side is connected with Uc0Secondary side connected with UacRepeating the above method to determine Uc0Specific difference of (e)bcAngle difference deltabc；
Step six: calculating the error, wherein the error is not more than 1%.
5. The comprehensive error testing method of the electric energy meter according to claim 4, characterized in that the error calculation comprises the following steps:
firstly, calculating a phase shift error:
calculated as%;
secondly, calculating the synthesis error of the standard electric energy meter:
calculated as%;
thirdly, calculating the overall error: e ═ e-Moving device+εwCalculated as%.
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| CN202110602719.2A CN113325360A (en) | 2021-05-31 | 2021-05-31 | Comprehensive error testing device and method for electric energy meter |
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| CN202110602719.2A CN113325360A (en) | 2021-05-31 | 2021-05-31 | Comprehensive error testing device and method for electric energy meter |
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2021
- 2021-05-31 CN CN202110602719.2A patent/CN113325360A/en active Pending
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