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Watt-hour meter calibration device and method outputting current under 1mA

An energy meter verification and current technology, applied in measuring devices, measuring electrical variables, instruments, etc., can solve the problems of self-excitation of current power, unstable output current, etc., to reduce high-frequency electromagnetic noise interference, current stability, and accuracy The effect of the test signal

Inactive Publication Date: 2016-02-03
SHANGHAI MUNICIPAL ELECTRIC POWER CO +2
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Problems solved by technology

However, the signal current of the "starting test" is only 0.3mA, which will inevitably be affected by these electromagnetic noises during work, which will make the output current unstable, and even cause the current power source to self-excite.

Method used

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  • Watt-hour meter calibration device and method outputting current under 1mA

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Embodiment

[0020] The purpose of the present invention is to solve the problem of stably and accurately outputting a test current of less than 1 mA in a multi-meter electric energy meter verification device, so as to meet the requirement of precise low current in the test process of the electric energy meter "starting test".

[0021] In order to ensure a stable and accurate "starting test" test current in each epitope, we have configured three 1:600 ​​small current transformers in each epitope according to the three phases of A / B / C. The accuracy of the transformer is 0.2 level. In the non-"starting test", the current transformer is not connected to the work table position. When carrying out the "starting test", connect the secondary circuit of the transformer to the corresponding current terminal of the meter holder through the connection of the relay. When a stable 180mA current is input to the primary circuit of the transformer, a stable and accurate "start-up test" test current of 0.3mA...

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Abstract

The invention relates to a watt-hour meter calibration device and a method outputting current under 1mA, which are used to accurately output 0.3mA test current during start test of a tested watt-hour meter in the process of alternating-current watt-hour meter calibration. The device comprises a current power source, a to-be-detected meter position, a current transformer, and a double-pole double-throw relay. The current power source, the primary side of the current transformer, the secondary side of the current transformer, the double-pole double-throw relay and the to-be-detected meter position are connected in sequence. The output current of the current power source is 180mA, and the magnification range of the current transformer is 180-600. Compared with the prior art, the device and the method are advantageous in that the device and the method are applicable to start test, the electromagnetic noise is reduced, the current is stable, and the like.

Description

Technical field [0001] The invention relates to the field of verification and testing of an AC electric energy meter for electric power measurement, in particular to an electric energy meter verification device and method with an output current of less than 1 mA. Background technique [0002] During the verification of the electric energy meter, it is necessary to conduct a "start test" test on the meter being inspected. In accordance with the verification regulations of the State Administration of Quality Inspection and Quarantine "JJG596-2012 Electronic AC Watt-hour Meters" and the requirements of the State Grid Corporation's corporate standard "Q / GDW1827-2013 Three-phase Smart Watt-hour Meter Technical Specifications", the minimum "start-up test" test current It is 0.3mA. The accuracy of the test current is a technical indicator with a deviation of not more than 5%. However, in reality, most domestically-made verification devices cannot output small currents below 1 mA stabl...

Claims

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Application Information

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IPC IPC(8): G01R35/04
Inventor 庄葛巍张晓颖余宇红申娟张静月郭凤兵姚民
Owner SHANGHAI MUNICIPAL ELECTRIC POWER CO
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