CN103091530B - Judge fast the whether qualified method of electric energy meter calibrating apparatus terminal potential difference - Google Patents
Judge fast the whether qualified method of electric energy meter calibrating apparatus terminal potential difference Download PDFInfo
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Abstract
The invention discloses a kind of quick whether qualified method of electric energy meter calibrating apparatus terminal potential difference that judges, is step of the present invention as follows: 1), for the electric energy meter calibrating apparatus without access voltage transformer, between the each Same Name of Ends of tested electric energy meter and standard electric energy meter, standard value is J* * U*1000 (1); For the electric energy meter calibrating apparatus of access voltage transformer, between tested electric energy meter and the each Same Name of Ends of voltage transformer primary side, standard value is J** U*1000 (2), between the each Same Name of Ends of standard electric energy meter and voltage transformer secondary side, standard value is J** U*1000(3), calculate standard value corresponding to different J values according to formula (1) ~ (3), wherein U is respectively 220V, 57.5V when single-phase, equipment for three-phase electrical energy meter; Obtain table 1 ~ 3; 2) measure potential difference between electric energy meter calibrating apparatus each Same Name of Ends, by respective electrical potential difference sum respectively with corresponding standard value comparison in table 1-3, if be less than or equal in table corresponding standard value the potential difference of surveying be qualified. The invention has the beneficial effects as follows that execute-in-place is simply efficient, contribute to find in time and deal with problems.
Description
Technical field
The present invention relates to a kind of whether qualified method of electric energy meter calibrating apparatus terminal potential difference that simply judges fast efficiently.
Background technology
At present, while examining and determine at the scene between the Same Name of Ends of electric energy meter calibrating apparatus of different brackets potential difference, whether be qualifiedly difficult to directly to judge measured at that time result, only have measurement result by calculating, could judge that whether measurement result is qualified with JJG597-2005 " AC electrical energy meter calibration " code specified standard after relatively, this method is in very inconvenience of measure field, if and accredited device is while being many, every pair of Same Name of Ends all needs to calculate, although computational methods are all the same, but still increase greatly workload, so not only lose time, the more important thing is and can not pinpoint the problems in time and deal with problems, gage work can not normally be carried out.
Specify according to JJG597-2005 " AC electrical energy meter calibration " code:
To the electric energy meter calibrating apparatus without access voltage transformer, between two pairs of voltage terminals of the same name of standard electric energy meter and tested electric energy meter, the percentage of potential difference sum and electric energy meter calibrating apparatus Plays electric energy meter reference voltage should be no more than 1/6 of the electric energy meter calibrating apparatus limits of error.
To the electric energy meter calibrating apparatus of access voltage transformer, between two pairs of voltage terminals of the same name that tested electric energy meter is connected with voltage transformer, the percentage of potential difference sum and electric energy meter calibrating apparatus output voltage should be no more than 1/6 of the electric energy meter calibrating apparatus limits of error, and between two pairs of voltage terminals of the same name that standard electric energy meter is connected with voltage transformer, the percentage of potential difference sum and electric energy meter calibrating apparatus Plays electric energy meter reference voltage should be no more than 1/8 of the electric energy meter calibrating apparatus limits of error.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of quick whether qualified method of electric energy meter calibrating apparatus terminal potential difference that judges.
For solving the problems of the technologies described above, the technical solution used in the present invention is that step is as follows:
1) calculate contrast standard value, by described standard value list:
A. in the time adopting the electric energy meter calibrating apparatus of nothing access voltage transformer, the standard value between the each Same Name of Ends of tested electric energy meter and standard electric energy meter should meet formula: standard value=J** U*1000(1), wherein, standard value unit is mV, the limits of error that J is described electric energy meter calibrating apparatus, unit is percentage, and U is described electric energy meter calibrating apparatus Plays electric energy meter reference voltage value, and unit is V;
1. for single-phase electric energy meter calibrating installation, corresponding standard value while calculating different J value according to formula (1), now the U in formula (1) gets 220V, obtains secondary series in table 1;
2. for equipment for three-phase electrical energy meter, corresponding standard value while calculating different J value according to formula (1), now the U in formula (1) gets 57.7V, obtains the 3rd row in table 1;
Table 1: without the electric energy meter calibrating apparatus terminal potential difference standard value of access voltage transformer
B. in the time adopting the electric energy meter calibrating apparatus of access voltage transformer, the standard value between tested electric energy meter and the each Same Name of Ends of voltage transformer primary side should meet formula: standard value=J** U*1000(2), the standard value between the each Same Name of Ends of standard electric energy meter and voltage transformer secondary side should meet formula: standard value=J** U*1000(3), in formula (2), (3), standard value unit is mV, and J is the limits of error of described electric energy meter calibrating apparatus, and unit is percentage, and U is described electric energy meter calibrating apparatus Plays electric energy meter reference voltage value, and unit is V;
1. for single-phase electric energy meter calibrating installation, corresponding standard value while calculating respectively different J value according to formula (2) and formula (3), now the U in formula (2) and formula (3) all gets 220V, obtains respectively secondary series and the 3rd row in table 2;
Table 2: the single-phase electric energy meter calibrating installation terminal potential difference standard value of access voltage transformer
2. for equipment for three-phase electrical energy meter, corresponding standard value while calculating respectively different J value according to formula (2) and formula (3), now the U in formula (2) and formula (3) all gets 57.7V, obtains respectively secondary series and the 3rd row in table 3;
Table 3: the equipment for three-phase electrical energy meter terminal potential difference standard value of access voltage transformer
2) measure and judge:
A.., when measurand is the electric energy meter calibrating apparatus of nothing access voltage transformer, milivoltmeter is connected on respectively between standard electric energy meter and the each Same Name of Ends of tested electric energy meter:
For single-phase electric energy meter calibrating installation, read magnitude of voltage on described milivoltmeter, Same Name of Ends voltage is remembered respectively and is ULlAnd UNn, obtain ULl+UNnThe standard value comparison corresponding with secondary series in table 1, if be less than or equal to standard value corresponding in table 1, illustrates that surveyed potential difference is qualified;
0.060000 Aa、UBb、UCcAnd UNn, obtain UAa+UNn、UBb+UNn、UCc+UNnWith the standard value comparison that in table 1, the 3rd row are corresponding, illustrate that surveyed potential difference is qualified if be all less than or equal to standard value corresponding in table 1 respectively;
B. when measurand is the electric energy meter calibrating apparatus of access voltage transformer:
For single-phase electric energy meter calibrating installation, milivoltmeter is connected on respectively between standard potential transformer primary side and the each Same Name of Ends of tested electric energy meter, read magnitude of voltage on described milivoltmeter, Same Name of Ends voltage is remembered respectively and is ULlAnd UNn, obtain ULl+UNnThe standard value comparison corresponding with secondary series in table 2, illustrates that this test result is qualified if be less than or equal to standard value corresponding in table 2; Milivoltmeter is connected on respectively between standard potential transformer secondary side and the each Same Name of Ends of standard electric energy meter, reads magnitude of voltage on described milivoltmeter, Same Name of Ends voltage is remembered respectively and is UlLAnd UnN, obtain UlL+UnNWith the standard value comparison that in table 2, the 3rd row are corresponding, illustrate that surveyed potential difference is qualified if be less than or equal to standard value corresponding in table 2;
For equipment for three-phase electrical energy meter, milivoltmeter is connected on respectively between standard potential transformer primary side and the each Same Name of Ends of tested electric energy meter, read magnitude of voltage on described milivoltmeter, Same Name of Ends magnitude of voltage is remembered respectively and is UAa、UBb、UCcAnd UNn, obtain UAa+UNn、UBb+UNn、UCc+UNnThe standard value comparison corresponding with secondary series in table 3 respectively, illustrates that surveyed potential difference is qualified if be all less than or equal to standard value corresponding in table 1; Milivoltmeter is connected on respectively between standard potential transformer secondary side and the each Same Name of Ends of standard electric energy meter, reads magnitude of voltage on described milivoltmeter, Same Name of Ends voltage is remembered respectively and is UaA、UbB、UcCAnd UnN, obtain UaA+UnN、UbB+UnN、UcC+UnNWith the standard value comparison that in table 3, the 3rd row are corresponding, illustrate that surveyed potential difference is qualified if be all less than or equal to standard value corresponding in table 1 respectively.
The beneficial effect that adopts technique scheme to produce is: as long as by rear and corresponding in table 1, table 2 and the table 3 standard value comparison of simple measured value addition, just can judge immediately that whether surveyed potential difference is qualified, not only shorten the testing time, and greatly improve operating efficiency, and can find in time and deal with problems, guarantee accuracy, reliability and the security of electric energy meter transmission of quantity value.
Brief description of the drawings
Fig. 1 is that the present invention measures the single-phase electric energy meter calibrating installation schematic diagram without access voltage transformer.
Fig. 2 is that the present invention measures the equipment for three-phase electrical energy meter schematic diagram without access voltage transformer.
Fig. 3 is the single-phase electric energy meter calibrating installation schematic diagram that the present invention measures access voltage transformer.
Fig. 4 is the equipment for three-phase electrical energy meter schematic diagram that the present invention measures access voltage transformer.
Detailed description of the invention
As shown in Fig. 1～4, embodiment 1 step is as follows:
1) calculate contrast standard value, make form:
A. in the time adopting the electric energy meter calibrating apparatus of nothing access voltage transformer, the standard value between the each Same Name of Ends of tested electric energy meter and standard electric energy meter should meet formula: standard value=J** U*1000(1), wherein, J value is 0.05%, 0.1%, 0.2%, 0.3%;
1. for single-phase electric energy meter calibrating installation, corresponding standard value while calculating different J value according to formula (1), now the U in formula (1) gets 220V, obtains secondary series in table 1;
2. for equipment for three-phase electrical energy meter, corresponding standard value while calculating different J value according to formula (1), now the U in formula (1) gets 57.7V, obtains the 3rd row in table 1;
Table 1: without the electric energy meter calibrating apparatus terminal potential difference standard value of access voltage transformer
B. in the time adopting the electric energy meter calibrating apparatus of access voltage transformer, the standard value between tested electric energy meter and the each Same Name of Ends of voltage transformer primary side should meet formula: standard value=J** U*1000(2), the standard value between the each Same Name of Ends of standard electric energy meter and voltage transformer secondary side should meet formula: standard value=J** U*1000(3), in formula (2), (3), J value is 0.05%, 0.1%, 0.2%, 0.3%;
1. for single-phase electric energy meter calibrating installation, corresponding standard value while calculating respectively different J value according to formula (2) and formula (3), now the U in formula (2) and formula (3) all gets 220V, obtains respectively secondary series and the 3rd row in table 2;
Table 2: the single-phase electric energy meter calibrating installation terminal potential difference standard value of access voltage transformer
2. for equipment for three-phase electrical energy meter, corresponding standard value while calculating respectively different J value according to formula (2) and formula (3), now the U in formula (2) and formula (3) all gets 57.7V, obtains respectively secondary series and the 3rd row in table 3;
Table 3: the equipment for three-phase electrical energy meter terminal potential difference standard value of access voltage transformer
2) measure and judge:
A.. be without the situation of the electric energy meter calibrating apparatus of access voltage transformer for measurand, milivoltmeter be connected on respectively between standard electric energy meter and the each Same Name of Ends of tested electric energy meter:
In the time that the limits of error of single-phase electric energy meter calibrating installation are 0.2%, read magnitude of voltage U on described milivoltmeterLlFor 10mV, UNnFor 10mV, the standard value that in table 1, secondary series is corresponding is 73mV, ULl+UNn=20mV < 73mV, illustrates that surveyed potential difference is qualified;
In the time that the limits of error of equipment for three-phase electrical energy meter are 0.1%, read magnitude of voltage U on described milivoltmeterAa=5.0mV、UBb=4.2mV、UCb=4.0mV、UNn=4.8mV, in table 1, standard value corresponding to the 3rd row is 9.6mV, UAa+UNn=9.8mV>9.6mV、UBb+UNn=9mV<9.6mV、UCc+UNn=8.8mV < 9.6mV, occurs one and is greater than standard value, illustrates that surveyed potential difference is underproof;
B. be the situation of the electric energy meter calibrating apparatus of access voltage transformer for measurand:
In the time that the limits of error of single-phase electric energy meter calibrating installation are 0.05%, milivoltmeter is connected on respectively between standard potential transformer primary side and the each Same Name of Ends of tested electric energy meter, read magnitude of voltage on described milivoltmeter, ULl=13mV、UNn=11mV, the standard value that in table 2, secondary series is corresponding is 18mV, ULl+UNn=24mV > 18mV, illustrate that this potential difference of surveying is underproof; Milivoltmeter is connected on respectively between standard potential transformer secondary side and the each Same Name of Ends of standard electric energy meter again, reads magnitude of voltage on described milivoltmeter, UlL=6mV、UnN=7mV, in table 2, standard value corresponding to the 3rd row is 13mV, UlL+UnN=13mV=13mV, illustrates that surveyed potential difference is qualified;
In the time that the equipment for three-phase electrical energy meter limits of error are 0.3%, milivoltmeter is connected on respectively between standard potential transformer primary side and the each Same Name of Ends of tested electric energy meter, read magnitude of voltage on described milivoltmeter, UAa=14mV、UBb=11mV、UCc=16mV、UNn=12mV, the standard value that in table 3, secondary series is corresponding is 28.8mV, UAa+UNn=26mV<28.8mV、UBb+UNn=23mV<28.8mV、UCc+UNn=28mV < 28.8mV, illustrates that surveyed potential difference is qualified; Milivoltmeter is connected on respectively between standard potential transformer secondary side and the each Same Name of Ends of standard electric energy meter again, reads magnitude of voltage on described milivoltmeter, UaA=10mV、UbB=9mV、UcC=13mV、UnN=10mV, in table 3, standard value corresponding to the 3rd row is 21.6mV, UaA+UnN=20mV<21.6mV、UbB+UnN=19mV<21.6mV、UcC+UnN=23mV > 21.6mV, illustrate that surveyed potential difference is underproof.
Claims (1)
1. judge the whether qualified method of electric energy meter calibrating apparatus terminal potential difference fast, it is characterized in that step is as follows:
1) calculate contrast standard value, by described standard value list:
A. in the time adopting the electric energy meter calibrating apparatus of nothing access voltage transformer, the standard value between the each Same Name of Ends of tested electric energy meter and standard electric energy meter should meet formula:Wherein, standard value unit is mV, the limits of error that J is described electric energy meter calibrating apparatus, and unit is percentage, and U is described electric energy meter calibrating apparatus Plays electric energy meter reference voltage value, and unit is V;
1. for single-phase electric energy meter calibrating installation, corresponding standard value while calculating different J value according to formula (1), now the U in formula (1) gets 220V, obtains secondary series in table 1;
2. for equipment for three-phase electrical energy meter, corresponding standard value while calculating different J value according to formula (1), now the U in formula (1) gets 57.7V, obtains the 3rd row in table 1;
Table 1: without the electric energy meter calibrating apparatus terminal potential difference standard value of access voltage transformer
B. in the time adopting the electric energy meter calibrating apparatus of access voltage transformer, the standard value between tested electric energy meter and the each Same Name of Ends of voltage transformer primary side should meet formula:Standard value between the each Same Name of Ends of standard electric energy meter and voltage transformer secondary side should meet formula:In formula (2), (3), standard value unit is mV, and J is the limits of error of described electric energy meter calibrating apparatus, and unit is percentage, U is described electric energy meter calibrating apparatus Plays electric energy meter reference voltage value, and unit is V;
1. for single-phase electric energy meter calibrating installation, corresponding standard value while calculating respectively different J value according to formula (2) and formula (3), now the U in formula (2) and formula (3) all gets 220V, obtains respectively secondary series and the 3rd row in table 2;
Table 2: the single-phase electric energy meter calibrating installation terminal potential difference standard value of access voltage transformer
2. for equipment for three-phase electrical energy meter, corresponding standard value while calculating respectively different J value according to formula (2) and formula (3), now the U in formula (2) and formula (3) all gets 57.7V, obtains respectively secondary series and the 3rd row in table 3;
Table 3: the equipment for three-phase electrical energy meter terminal potential difference standard value of access voltage transformer
2) measure and judge:
A., when measurand is the electric energy meter calibrating apparatus of nothing access voltage transformer, milivoltmeter is connected on respectively between standard electric energy meter and the each Same Name of Ends of tested electric energy meter:
For single-phase electric energy meter calibrating installation, read magnitude of voltage on described milivoltmeter, Same Name of Ends voltage is remembered respectively and is ULlAnd UNn, obtain ULl+UNnThe standard value comparison corresponding with secondary series in table 1, illustrates that surveyed potential difference is qualified if be less than or equal to standard value corresponding in table 1;
For equipment for three-phase electrical energy meter, read magnitude of voltage on described milivoltmeter, Same Name of Ends magnitude of voltage is remembered respectively and is UAa、UBb、UCcAnd UNn, obtain UAa+UNn、UBb+UNn、UCc+UNnWith the standard value comparison that in table 1, the 3rd row are corresponding, illustrate that surveyed potential difference is qualified if be all less than or equal to standard value corresponding in table 1 respectively;
B. when measurand is the electric energy meter calibrating apparatus of access voltage transformer:
For single-phase electric energy meter calibrating installation, milivoltmeter is connected on respectively between standard potential transformer primary side and the each Same Name of Ends of tested electric energy meter, read magnitude of voltage on described milivoltmeter, Same Name of Ends voltage is remembered respectively and is ULlAnd UNn, obtain ULl+UNnThe standard value comparison corresponding with secondary series in table 2, illustrates that this test result is qualified if be less than or equal to standard value corresponding in table 2;
Milivoltmeter is connected on respectively between standard potential transformer secondary side and the each Same Name of Ends of standard electric energy meter, reads magnitude of voltage on described milivoltmeter, Same Name of Ends voltage is remembered respectively and is UlLAnd UnN, obtain UlL+UnNWith the standard value comparison that in table 2, the 3rd row are corresponding, illustrate that surveyed potential difference is qualified if be less than or equal to standard value corresponding in table 2;
For equipment for three-phase electrical energy meter, milivoltmeter is connected on respectively between standard potential transformer primary side and the each Same Name of Ends of tested electric energy meter, read magnitude of voltage on described milivoltmeter, Same Name of Ends magnitude of voltage is remembered respectively and is UAa、UBb、UCcAnd UNn, obtain UAa+UNn、UBb+UNn、UCc+UNnThe standard value comparison corresponding with secondary series in table 3 respectively, illustrates that surveyed potential difference is qualified if be all less than or equal to standard value corresponding in table 1; Milivoltmeter is connected on respectively between standard potential transformer secondary side and the each Same Name of Ends of standard electric energy meter, reads magnitude of voltage on described milivoltmeter, Same Name of Ends voltage is remembered respectively and is UaA、UbB、UcCAnd UnN, obtain UaA+UnN、UbB+UnN、UcC+UnNWith the standard value comparison that in table 3, the 3rd row are corresponding, illustrate that surveyed potential difference is qualified if be all less than or equal to standard value corresponding in table 1 respectively.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201378204Y (en) * | 2009-02-05 | 2010-01-06 | 江苏省电力试验研究院有限公司 | Automatic detecting and metrological characteristic analyzing device for energy meter standard devices |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201378204Y (en) * | 2009-02-05 | 2010-01-06 | 江苏省电力试验研究院有限公司 | Automatic detecting and metrological characteristic analyzing device for energy meter standard devices |
Non-Patent Citations (4)
| Title |
|---|
| 《交流电能表检定装置》改版后如何进行装置检定;杨峻;《青海电力》;20080331;第27卷(第1期);第9-13页 * |
| 交流电能表检定装置的测试;王进 等;《农林电气化》;20081231(第250期);第16-17页 * |
| 交流电能表检定装置量值比对;牛军蕊 等;《工业计量》;20101231;第124-126、142页 * |
| 电能表检定装置在应用中的问题分析与对策;刘润民;《计量技术》;20061231(第5期);第45-47页 * |
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