Device and method for on-line switching uninterrupted power supply

Abstract

The invention discloses a device and a method for on-line switching UPS. An input terminal of the UPS is connected to an input power supply loop through inputting a power switch (MCB2) by the UPS device, and is connected to a commercial power circuit through a supply line switch (MCB1), an output terminal of the UPS is connected to an output power supply loop and to a user facility 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.

Description

technical field [0001] The invention relates to power system equipment, more specifically, to a device and method for switching uninterruptible power supplies online. Background technique [0002] The loads that adopt the uninterruptible power supply (UPS) power supply method are generally important users that cannot be powered off and have high requirements for power quality. At present, in the power supply circuit 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 is faulty, abnormal or the internal components of the device are faulty. The purpose is mainly to protect the inside of the device. Components are not damaged, such as switching to the internal bypass when the voltage and frequency indicators of the power supply system exceed their ratings, and the components of the rectification and inverter modules in the device are abnormal or faulty. ...

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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