Method for judging misconnection of three-phase four-wire electric energy meter

Abstract

The invention provides a method for judging misconnection of a three-phase four-wire electric energy meter. The method comprises the following steps of S100, selecting an abnormal window with abnormal current; S200, applying a cosine similarity algorithm to respectively solve a phase sequence current correlation coefficient in the abnormal window, a power factor corresponding to an abnormal phase sequence, and a cosine similarity between an electric energy representation value and a horizontal line; and S300, comparing a calculation result with a corresponding threshold value, and judging whether wrong wiring abnormity exists or not. According to the method, a big data analysis means is fully utilized, 95 quantiles are utilized, an abnormal output window is selected through high-load working current, a cosine similarity algorithm is utilized to analyze the abnormal window, and current similarity, electric energy representation value horizontal line similarity and the like between phase sequences are solved, so wrong wiring abnormity is judged. According to the method, the manual workload is greatly reduced, and the influence of human factor judgment is removed, so intelligent, automatic and rapid wrong wiring abnormity judgment is realized, and working difficulty of field checking is greatly reduced.

Description

technical field [0001] The invention relates to the technical field of electric energy meters, in particular to a method for judging wrong connections of three-phase four-wire electric energy meters. Background technique [0002] With the rapid development of the power industry, the demand for electric energy in all walks of life is increasing, and the accuracy of electric energy measurement is required to be higher and higher. For three-phase meters, the wiring method is more complicated. It is often used in special transformers or industrial power consumption. The power consumption is large. Wrong wiring will cause inaccurate measurement and cause large economic losses to the power grid company. [0003] At present, the existing technology is not comprehensive for the miswiring analysis of three-phase four-wire, and manual proofreading is required. For example, in the relevant patents, the wiring diagram of the three-phase four-wire electric energy metering device correspo...

AI Technical Summary

Problems solved by technology

[0004] With the development of the power industry, automation and intelligence will be the natural trend of the future development of the power industry. By pre-drawing the wiring diagram and vector diagram of the three-phase four-wire electric energy metering device corresponding to all kinds of voltage parameters and current parameter combinations It takes a lot of time, and it is difficult to avoid errors caused by human errors. At the same time, this method has poor scalability, and it is difficult to cope with the current trend of intelligent and automated development of metering equipment.

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