Portable direct-current power supply

Abstract

The invention provides a portable direct-current power supply which is used for temporary standby application and used for a test. The portable direct-current power supply comprises a lightning protection device, an alternating-current distribution unit, a charging module, a voltage reduction unit, a control circuit and a centralized monitoring and insulating monitoring unit. The portable direct-current power supply is suitable for medium and small power plants, hydroelectric power stations and all types of transformer substations in electric systems and is suitable for other users, such as petrochemical enterprises, mines and railways, utilizing direct-current devices. The portable direct-current power supply can provide an experiment direct-current power supply, can temporarily replace an existing direct-current power supply, is suitable for serving as a standby direct-current power supply for relay protection and fault illumination for instruments, meters, and the like in a secondary circuit. In order to meet the requirement of on-site running, the portable direct-current power supply can not only serve as a direct-current power supply but also monitor overvoltage or voltage shortage of a bus, and can be connected with a local monitoring system through a 485 remote communication interface so that the portable direct-current power supply can be monitored remotely and on site.

Description

technical field [0001] The invention relates to a DC power supply, in particular to a portable DC power supply for temporary backup and testing, which is suitable for small and medium-sized power plants, hydropower stations, various substations, and other users using DC equipment, such as petrochemicals, mines, Railways, etc., can provide experimental DC power supply, and can also temporarily replace the original DC power supply. It is suitable for backup DC power supply for instruments, meters, relay protection and fault lighting in the secondary circuit, and belongs to the field of relay protection. Background technique [0002] The DC power supply is widely used in substations, distribution stations, and power plants. Generally, the DC charger is charged by AC 220V, and the DC charger supplies the DC bus to ensure the load demand on the DC bus in a short time. DC power supply for electrical devices such as AC uninterruptible power supply for control of automation devices....

AI Technical Summary

Problems solved by technology

[0003] In the existing technology, when the DC power supply in the 66 kV and below substation fails, the DC power supply cannot be provided in time, which will lead to the unstable operation of the equipment and cause economic losses; in addition, the existing technology is cumbersome to connect the power supply during the equipment test ,low efficiency

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