On-site calibration method based on unification of three-phase three-wire electric energy meter and three-phase four-wire electric energy meter

Abstract

The invention discloses an on-site calibration method based on unification of a three-phase three-wire electric energy meter and a three-phase four-wire electric energy meter. A three-phase four-wireelectric power calibrator is adopted for calibration, and a path of magnetic latching relay is installed on the three-phase four-wire electric power calibrator and used for switching one of a B phaseand an N phase in a circuit wire to serve as a system ground of equipment. According to the method, the three-phase three-wire and three-wire four-wire unified metering mode can be realized by using one path of magnetic latching relay to switch one of the B phase and the N phase to serve as the system ground of the equipment through one set of power calibrator, the operation is simple and reliable, and through calibration of the three-phase three-wire and three-phase four-wire electric energy meters, great convenience is brought to actual operation and maintenance work, and the working efficiency of on-site operation and maintenance is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of electric energy meter calibration, and in particular relates to an on-site calibration method based on the unity of three-phase three-wire electric energy meters and three-phase four-wire electric energy meters. Background technique [0002] With the advancement of the State Grid and China Southern Power Grid's smart grid construction, hundreds of millions of energy meters are currently being installed, and the number of installed energy meters in the State Grid alone has reached 450 million. With the gradual increase in the number of installed electric energy meters and the increase in operating time, the problems of on-site electric energy meters have gradually accumulated. As a measuring instrument, especially its measurement accuracy has attracted much attention. An effective and convenient on-site electric energy meter calibration method can effectively solve the problem of error calibration in the p...

AI Technical Summary

Problems solved by technology

Since the three-phase three-wire and three-phase four-wire methods of on-site electric energy meters exist at the same time, the traditional calibration method will use different calibration equipment and calibration methods, which will increase the difficulty of on-site operation and maintenance, and easily cause confusion and misuse of equipment. A reliable verification method and equipment that can simultaneously verify three-phase three-wire and three-phase four-wire electric energy meters can bring great convenience to the actual operation and maintenance work, and greatly improve the work efficiency of on-site operation and maintenance