Direct current even harmonic error calibration method and electric energy meter
A technology of DC even-order and error calibration, applied in the direction of measuring electrical variables, instruments, measuring devices, etc., can solve the problem that the transformer cannot resist the DC component, and achieve the effect of improving accuracy and reducing costs
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[0049] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in combination with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are exemplary only, and are not intended to limit the scope of the present invention. Also, in the following description, descriptions of well-known structures and techniques are omitted to avoid unnecessarily obscuring the concept of the present invention.
[0050] Taking an electric energy meter with a current specification of 0.2-0.5(60)A as an example, the specific test data is shown in Table 1 below.
[0051] Table 1:
[0052]
[0053]
[0054] It can be seen from Table 1 that the greater the current, the greater the error change due to the influence of DC even-order harmonics. In the case of a power factor of 1.0, the current is below 30A, and the error change meets...
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