Method and system for online evaluating overall measuring errors of electric energy measuring device

Abstract

The invention discloses a method and a system for online evaluating overall measuring errors of an electric energy measuring device. The method includes the steps of firstly, online acquiring multiple groups of electric energy data, and calculating corresponding bus electric energy unbalance rates to build mapping models; secondly, using two optional circuits to form a circuit pair, setting the virtual electric energy value of the current circuit pair and the electric energy value of other circuits to be 0 each time, calculating to obtain a virtual bus electric energy unbalance rate which serves as the overall measuring relative error of the electric energy measuring device of the current circuit pair according to the mapping models, and finally acquiring the overall measuring relative errors of all circuit pairs; thirdly, comparing the overall measuring relative errors with preset error conditions to judge error states. The system comprises a mapping model building module, a relative error calculating module and an error state evaluating module. The method and the system have the advantages that field tests are not needed, the overall measuring error states of the electric energy measuring device can be monitored in real time, and the method is simple to implement, convenient to use and efficient and safe.

Description

technical field [0001] The invention relates to the technical field of electric equipment state evaluation, in particular to an online evaluation method and system for the overall measurement error of an electric energy metering device. Background technique [0002] The accurate measurement of electric energy is the basis for ensuring the fairness of electricity billing, but at present, the wrong electricity caused by metering failures is still considerable every year. At present, there are also many technical means for detecting the failure of the metering device, such as installing a loss of pressure and current timer in the secondary circuit, and issuing an alarm after detecting the loss of pressure and current; or using the negative control terminal to collect the power information of the electric energy meter in real time and Carry out manual analysis, if there is illogical power information, it is determined that the power metering device may be faulty. Although the a...

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Problems solved by technology

At present, there are also many technical means for detecting the failure of the metering device, such as installing a loss of pressure and current timer in the secondary circuit, and issuing an alarm after detecting the loss of pressure and current; or using the negative control terminal to collect the power information of the electric energy meter in real time and Carry out manual analysis, if there is illogical power information, it is determined that the power metering device may be faulty

Although the above method can monitor failures such as voltage loss and current loss of the electric energy metering device and make a judgment after the failure occurs, it cannot monitor and judge the continuous deterioration process before the failure of the device, and cannot timely detect the failure of the equipment before the failure occurs. Provide early warning information to avoid damage to the device

[0003] The process of state degradation of the electric energy metering device is usually manifested by the continuous increase of the metering error of the device, and the out-of-tolerance of the metering error is a hidden fault, and the above method cannot detect hidden faults and defects

At present, the main method for error evaluation of electric energy metering devices is to verify or detect each link of the metering system. During the test, the error detection of the electric energy meter and the TV secondary voltage drop test can be carried out online, while the verification of the transformer must be carried out with power off. , so this kind of method is time-consuming and labor-intensive and requires specific testing opportunities, which cannot be implemented on a large scale in a short period of time

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