Working method of switch cabinet for electric power system

Abstract

The invention relates to a working method of a switch cabinet for an electric power system. The switch cabinet comprises a direct current voltage module which is suitable for producing direct current voltage output, and the direct current voltage module takes power from a bus bar end of the switch cabinet. The direct current voltage module comprises a mutual inductor, a charging management unit and a direct current voltage output unit, wherein the mutual inductor is suitable for taking power from the bus bar end of the switch cabinet and is connected with a rectifier filter unit; the charging management unit is suitable for controlling charging and discharging of a storage battery. According to the working method of the switch cabinet for the electric power system, the direct current voltage module which is arranged inside provides corresponding direct current voltage so as to meet normal work of relevant instruments and meters in the switch cabinet; an MCU unit is used for controlling charging and discharging, an over charging phenomenon of the storage battery is avoided, the service life of the storage battery is prolonged effectively, power required for normal work of the instruments and meters during power failure maintenance is provided by the storage battery, and a power supply is not required to be connected externally.

Description

Technical field [0001] The invention belongs to the technical field of electric power engineering, and in particular relates to a switch cabinet with a built-in power supply module and a working method thereof. Background technique [0002] In the power system, a large number of ring network cabinets are used in the power supply system, but there is no AC / 220V power supply in the ring network cabinet, causing many electrical instruments to be unable to supply power normally. Most of them use CT (Current Transformer, current transformer) as the power supply. , And once the primary current is too small, the CT power coil cannot supply power to the instrument normally, making the instrument unable to work normally, and even the display and setting functions cannot be used, which brings unnecessary troubles to operation and maintenance; it is also unable to drive related instruments. , The work of the instrument, such as: cable head temperature online monitoring device and ring netwo...

AI Technical Summary

Problems solved by technology

[0002] In the power system, a large number of ring network cabinets are used in the power supply system, but there is no AC / 220V power supply in the ring network cabinet, causing many electrical instruments to fail to supply power normally, and most of them use CT (Current Transformer, current transformer) to take power as power supply , and once the primary current is too small, the CT coil cannot supply power to the instrument normally, so that the instrument cannot work normally, and even the display and setting functions cannot be used, which will bring unnecessary troubles to operation and maintenance; it will not be able to drive related instruments , Instrument work, such as: cable head temperature online monitoring device and ring network cabinet anti-misoperation locking device

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