System for switching power supplies without disconnecting bus from power supplies

Abstract

The invention discloses a system for switching power supplies without disconnecting a bus from the power supplies. The system comprises a first solid-state power switch serially connected between a first isolation switch and a second isolation switch and a second solid-state power switch serially connected between a third isolation switch and a fourth isolation switch, wherein each of the first solid-state power switch and the second solid-state power switch comprises a quick switch, a silicon controlled module, and a zero-crossing triggering unit which is connected with the silicon controlled module and used for triggering the corresponding silicon controlled module to be conducted when current in the system crosses the zero point; and the quick switches and the silicon controlled modules are parallelly connected. The time for triggering the silicon controlled modules to be conducted is micro-second, so that spare power automatic switching time can be greatly shortened, and the power supplies are switched under the condition that power is uninterrupted, the running reliability of downstream electric equipment is guaranteed, capacity of an uninterruptible power supply allocated at the downstream electric equipment terminal is greatly reduced, a large amount of maintenance cost and electric energy consumption are reduced, the protection range is wider compared with that of the uninterruptible power supply, and the stability of the power supply system is enhanced.

Description

technical field [0001] The present application relates to the field of power system technology, in particular to a bus uninterruptible switching system with backup power supply. Background technique [0002] In an existing 6.6kV busbar power supply system, a split busbar structure is adopted. The power supply system is equipped with two 110kV main transformers, and the two main transformers are backup for each other. When the backup main transformer is put into operation in the power supply system, the switching time It takes 6s. Due to the long switching time, all downstream electrical equipment will be powered off, seriously affecting the normal operation of electrical equipment. [0003] The UPS (Uninterruptible Power Supply, uninterruptible power supply) system can be distributed on the downstream electrical equipment side. When the power supply source is switched or the power is cut off, the UPS system will support the normal operation of the downstream electrical equip...

AI Technical Summary

Problems solved by technology

[0002] In an existing 6.6kV busbar power supply system, a split busbar structure is adopted. The power supply system is equipped with two 110kV main transformers, and the two main transformers are backup for each other. When the backup main transformer is put into operation in the power supply system, the switching time It takes 6s. Due to the long switching time, all downstream electrical equipment will be powered off, which seriously affects the normal operation of electrical equipment.

[0003] The UPS (Uninterruptible Power Supply, uninterruptible power supply) system can be distributed on the downstream electrical equipment side. When the power supply source is switched or the power is cut off, the UPS system will support the normal operation of the downstream electrical equipment. However, the UPS system is used for uninterruptible power supply. For protection, the initial investment in system construction is very high, and the subsequent maintenance costs are also high. The power loss of the UPS system is high, the installation and transformation are difficult, and the UPS system takes up a lot of space

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