Charging device of direct-current (DC) system

Abstract

The invention relates to a charging device of a direct-current (DC) system. A power supply main loop is composed of an alternating-current (AC) input air switch, a charging set, a DC input air switch, a shunt, a feeder air switch and a storage battery charging air switch; an AC power supply is converted into DC for charging a storage battery set and supplying power for DC loads; an alarm signal loop is composed of an alternating voltage monitoring alarm device, an over-undervoltage alarm device, an insulating alarm device, a fault signal output terminal strip and the fault trip signals of the DC input air switch, the feeder air switch and the storage battery charging air switch; and when the DC voltage is in an abnormal state, the alarm is sent to remote inspection equipment. The charging device has the advantages of miniaturization, multi-modularization and flexible configuration, and can meet requirements for use environments on site and construction yards; for the discharging device, the characteristics of the DC system are taken into account, thus flexibly regulating charger volume in accordance with different requirements for construction yards, and configuring a reasonable alarm system; and the charging device can improve the safe reliability of DC system transformation at the same time of meeting the use conditions on site.

Description

technical field [0001] The invention relates to a charging device, in particular to a DC system charging device. The DC system charging device used for the replacement and reconstruction of the DC system of the power system power plant and substation can also be used as an emergency charging device for the DC system of the power system power plant and substation. Background technique [0002] Substation DC system is a very important secondary equipment of substation. Its main task is to provide DC operating power for relay protection, switch opening, closing and control. Its normal operation is related to whether the relay protection and switch can correctly remove the fault, which will affect the whole station and even the upper substation. of normal operation. However, as the DC system of the substation has a long operating life, the equipment is seriously aging and there are many defects, which will seriously affect the reliability of the DC power supply of the substati...

AI Technical Summary

Problems solved by technology

[0004] 1. The whole set of DC system is used as a temporary charging system. Because it is a complete DC system, its reliability and sensitivity can meet the requirements of on-site use. However, due to the constraints of the construction site and other factors, it is difficult to use it reasonably. The location of the group screen is not ideal, resulting in the inability of the feeder cable to be connected during the renovation process, etc.

[0005] 2. Use temporary chargers, feeder boards, etc. to assemble a temporary charging system. Because of its small equipment and flexible assembly, it can generally meet the site use requirements on site. However, due to its simple structure and weak related monitoring and alarm functions, it is not very Adapt to the complex construction environment of live replacement of DC system, and serve as an important task of temporary charging system

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