Multi-meter mutual detection method for electric meter measurement accuracy

Abstract

The invention relates to a multi-meter mutual detection method for electric meter measurement accuracy. A load current Ii of a current meter is fed back to a neutral line of a next meter, a neutral line of the next meter has increment, through the increase and a feedback ratio, a load current Ij of the meter can be measured by the next meter, the two current values are theoretically the same, however, the two always have deviation E, if a problem of measurement of a certain energy meter occurs, that is, when a measurement value is enlarged (or reduced) m times at a certain time, that the average current value through self measurement and an average current value of a previous meter monitored are enlarged (or reduced) m times can be easily derived. The method is advantaged in that the meters in an operation state mutually monitor each other, high real-time performance is achieved, fault tables can be rapidly positioned, measurement losses or disputes are reduced, only adding a few current transformers is needed, and cost is relatively low.

Description

technical field [0001] The invention relates to a method for detecting the measurement accuracy of an electric energy meter. Background technique [0002] The electric energy meter is a kind of metering product. Although strict metering accuracy control has been done in the production of the manufacturer and the acceptance of the power company, there is no way to know whether the metering accuracy is out of range for a certain period of time during the operation. judge. When the user has doubts about measurement inaccuracy, the power company needs to go to the site for inspection. On the one hand, the on-site inspection must be performed without power failure, because if the embedded software of the electric energy meter has an execution problem, re-powering will cause the fault reset to disappear; on the other hand It is also possible that the energy meter failure has been recovered during detection, and the detection results in both cases will be judged to be normal in th...

AI Technical Summary

Problems solved by technology

[0002] The electric energy meter is a kind of metering product. Although strict metering accuracy control has been done in the production of the manufacturer and the acceptance of the power company, there is no way to know whether the metering accuracy is out of range for a certain period of time during the operation. judge

When the user has doubts about measurement inaccuracy, the power company needs to go to the site for inspection. On the one hand, the on-site inspection must be performed without power failure, because if the embedded software of the electric energy meter has an execution problem, re-powering will cause the fault reset to disappear; on the other hand It is also possible that the fault of the energy meter has been recovered during the detection, and the detection results in both cases will be judged to be normal in the energy meter, which cannot reflect the real situation