Application meted for determining voltage phase and checking phase by using cosine law

Abstract

The invention relates to an application meted for determining a voltage phase and checking a phase by using a cosine law. According to the method, when transformers are in parallel operation, phase check is required to be performed on the transformers or a voltage transformer is utilized to perform the phase check, and the cosine law is utilized to obtain two voltage included angle (phase), and therefore, the phase of voltage can be determined. The application meted is applicable to field phase determination and phase check. The application meted for determining the voltage phase and checking the phase by using the cosine law comprises the following steps that: a special value method in a matrix is utilized to perform real-time analysis on field actual measurement data, such that wiring group types of the transformers can be obtained quickly, and therefore, it is determined that primary wiring of the transformers is regulated; after a fuse at the primary side of a voltage transformer of an electric energy metering device is fused, the voltage between an opened phase and a non-opened phase of the secondary side of the voltage transformer can be inducted, and the voltage is abnormal, and a voltage phase between the opened phase and the non-opened phase changes; the cosine law is utilized to perform phase determination after the fuse of the voltage transformer of the electric energy metering device is fused, the phase of the voltage between the opened phase and the non-opened phase is obtained such that a new power calculation formula of an electric energy meter is determined; and a normal voltage transformer is utilized to perform phase check on the voltage transformer of which the phase is opened, such that the phase of the voltage between the opened phase and the non-opened phase can be determined, and the new power calculation formula of the electric energy meter can be obtained.

Description

1. Technical fields; [0001] 1 In the neutral point insulated line system of the power industry, due to the harmonics generated by the electrical equipment and the operating overvoltage after external power overvoltage, etc., it often causes the high power meter electric energy metering device and the fuse on the primary side of the voltage transformer to blow. . When the fuse of the voltage transformer of the electric energy metering device is blown at one time, the metering device cannot operate normally, and the actual power consumption of the user cannot be measured correctly. The metering is inaccurate, resulting in less metered electricity and economic losses to the power company. Improper handling can easily cause supply and demand. The two parties had a dispute over electricity charges. Determine the phase of the line voltage related to the phase failure after a voltage transformer phase failure [0002] 2. When the transformers are running in parallel, it is necessar...

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