Device and method for on-line switching uninterrupted power supply

Abstract

The invention discloses an on-line switching UPS device and a method thereof. An input terminal of the UPS is connected to an input power supply loop through inputting a power switch MCB2 by the UPS device, wherein, the input power supply loop is connected to the commercial power circuit through a supply line switch MCB1, an output terminal of the UPS is connected to an output power supply loop, a user facility is connected to the output power supply loop by a user load switch MCB3. The device also comprises an outer shunt circuit connected in parallel with the UPS and a set of contactors, wherein, the outer shunt circuit is connected to the input power supply loop by an outer shunt circuit switch MCB4 and is connected with the output power supply loop; a first main contact point MC1 is connected in series between the output terminal of the UPS and the output power supply loop, a second main contact point MC2 is connected in series between the outer shunt circuit switch MCB4 and the output power supply loop; the contactors are switched between the UPS and the outer shunt circuit. The technical proposal of the invention realizes that the switching way of the controller is controlled by the joint point of a relay by adopting a small number of elements such as the set of controllers, the relay and the switch and basically realizes the very quick switching. Therefore, the invention is an economic and effective UPS on-line switching mode.

Description

Technical field [0001] The present invention relates to power system equipment, and more specifically, to a device and method for online switching of uninterrupted power supplies. Background technique [0002] Loads that use uninterruptible power supply (UPS) power supply are generally important users who cannot be powered off and have high power quality requirements. At present, in the power supply circuits of UPS devices at home and abroad, in addition to the UPS power supply mode when there is a normal power supply mode, there is also an internal bypass device when the power grid fails, abnormal or internal component failure of the device, the purpose of which is mainly to protect the inside of the device The components are not damaged, such as: when the voltage and frequency indicators of the power supply system exceed their ratings, and the rectifier or inverter module components in the device are abnormal or faulty, switch to the internal bypass. The disadvantage of this ty...

AI Technical Summary

Problems solved by technology

The disadvantage of this type of configuration is that it cannot meet the needs of UPS device failure emergency repair, offline maintenance function and device periodic test requirements. When the UPS device is abnormal or faulty, only power outage processing will be performed, which will affect the continuous power demand of these important users.

The power outage mode during the periodical maintenance and function test of the UPS unit also has an impact on the continuous power supply of these users

[0003] In the prior art, there is no relevant technology that solves the problem of emergency repair when the UPS device is abnormal and the problem of power failure to the load during regular maintenance

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