JP2012222886A - Uninterruptible power supply system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an uninterruptible power supply system in which the installation space can be reduced without compromising the function of an output board and a maintenance bypass board.SOLUTION: The uninterruptible power supply system comprises a plurality of uninterruptible power supplies 11, 12, 13 being fed from respective AC power supplies, and at least one output board 31 having a parallel bus for connecting the outputs of respective uninterruptible power supplies 11, 12, 13 in parallel via respective output switches 31a, 31b, 31c. The output board 31 is provided with maintenance bypass switches 31d, 31e, 31f connecting the respective AC power supplies and the parallel bus so as to use the parallel bus and the connection bus for the maintenance bypass switches commonly.

Description

  The present invention relates to an uninterruptible power supply system that performs parallel operation.

  FIG. 3 is a block configuration diagram of an uninterruptible power supply system including, for example, two or more uninterruptible power supply apparatuses disclosed in Non-Patent Document 1. In the figure, uninterruptible power supplies 11, 12, and 13 are supplied with AC voltage from input transformer panels 21, 22, and 23, respectively. On the output side of the uninterruptible power supply devices 11, 12, and 13, output panels 31 and 32 configured to receive power from any of the uninterruptible power supply devices 11, 12, and 13 are provided. During normal operation, both the output switches of the output panels 31 and 32 are turned on, and the uninterruptible power supply apparatuses 11, 12 and 13 are operated in parallel via the parallel buses in the panel. The outputs of these output boards 31 and 32 are input to the output branch boards 51 and 52 that branch the main line into two or more systems. In order to maintain the uninterruptible power supply devices 11, 12 and 13, the input transformer board A maintenance bypass board 41 having a built-in maintenance bypass circuit changeover switch 41a for branching and connecting to the input of the output branch board 51 and supplying power to the load is provided.

Ogasawara, "UPS System Configuration", Production and Electricity, NEC Corporation, December 15, 2009, Vol. 61, No. 12, p.19-23

  Since the conventional uninterruptible power supply system is configured as described above, a maintenance bypass panel is required to supply the AC input power to the load without passing through the uninterruptible power supply and to check the uninterruptible power supply system. there were. When the system capacity of the uninterruptible power supply system is increased, a large-capacity maintenance bypass circuit switch and a large-capacity maintenance bypass circuit bus are required, so that the maintenance bypass panel becomes large and there is a problem of installation space.

  The present invention has been made to solve the above-described problems, and provides an uninterruptible power supply system that can reduce the installation space without impairing the functions of the output panel and the maintenance bypass panel. Objective.

  In order to achieve the above object, an uninterruptible power supply system of the present invention includes a plurality of uninterruptible power supply units each fed by an AC power supply and outputs of the respective uninterruptible power supply units in parallel via output switches. An uninterruptible power supply system comprising at least one output panel having a parallel bus to be connected, wherein the output panel has a maintenance bypass switch for connecting each AC power source and the parallel bus, respectively. The parallel bus is shared with the maintenance bypass switch connection bus.

  According to the present invention, it is possible to provide an uninterruptible power supply system capable of reducing the installation space without impairing the functions of the output panel and the maintenance bypass panel.

It is a block block diagram which shows the uninterruptible power supply system which concerns on Example 1 of this invention. It is a block block diagram which shows the uninterruptible power supply system which concerns on Example 2 of this invention. It is a block block diagram which shows the conventional uninterruptible power supply system.

  Embodiments of the present invention will be described below with reference to the drawings.

  Embodiment 1 of the present invention will be described below with reference to FIG. FIG. 1 is a block diagram of an uninterruptible power supply system according to Embodiment 1 of the present invention, which is composed of two or more uninterruptible power supply apparatuses. In the figure, uninterruptible power supply apparatuses 11, 12 and 13 are supplied with AC voltage from AC power supply via input transformer panels 21, 22 and 23, respectively. On the output side of the uninterruptible power supply devices 11, 12, and 13, output boards 31 and 32 that can be switched so as to be able to receive power from any of the uninterruptible power supply devices 11, 12, and 13 are provided. The outputs of the output boards 31 and 32 are connected to output branch boards 51 and 52 that branch the trunk line into two or more systems.

  The uninterruptible power supply devices 11, 12 and 13 are bypass side switches 11a, 12a and 13a for bypassing the AC power supply and supplying the load, and inverter side switches 11b and 12b provided on the output side of the internal inverter. And 13b, respectively. Since the uninterruptible power supply devices 11, 12, and 13 are well-known devices, a detailed description of the internal configuration is omitted here.

  The output panel 31 is provided with output switches 31a, 31b and 31c for selectively receiving the outputs from the uninterruptible power supply devices 11, 12 and 13, respectively. The outputs of these output switches 31a, 31b and 31c are as follows. The output board 31 is connected to a common bus provided on the output side. Similarly, the output panel 32 is provided with output switches 32a, 32b, and 32c for selectively receiving outputs from the uninterruptible power supply devices 11, 12, and 13, respectively, and these output switches 32a, 32b, and 32c. Are connected to a common bus on the output side in the output panel 32.

  And, in order to maintain each of the uninterruptible power supply devices 11, 12, and 13, for branching from the input transformer panels 21, 22, and 23, switching to the common bus of the output panel 31 and supplying power to the load Maintenance bypass circuit switches 31d, 31e, and 31f are provided in the output panel 31, respectively. If necessary, such a maintenance bypass circuit switch is provided on the output panel 32 side, but it is not shown here as unnecessary.

  In the above configuration, the maintenance bypass panel and the maintenance bypass circuit bus that have been conventionally provided with a large space are omitted, and both of these are shared by the output panel and the common bus on the output side. Yes.

  Next, the operation will be described. In the normal operation mode, the uninterruptible power supply devices 11, 12 and 3 turn on the inverter side switches 11b, 12b and 13b, the output switches 31a, 31b and 31c of the output panels 31 and 32, and the output switches 32a and 32b. And 32c are all turned on to perform parallel operation. In order to check the uninterruptible power supply, first, the bypass side switches 11a, 12a and 13a inside the UPS are turned on, the inverter side switches 11b, 12b and 13b are opened, and the AC input power is connected to the uninterruptible power supply. Bypass power feeding is performed through an internal bypass circuit. Next, the maintenance bypass circuit switches 31d, 31e, and 31f are turned on, the output switches 31a, 31b, and 31c are opened, and the power supply to the output branch board 51 is switched from the uninterruptible power supply side to the input transformer board side. In this way, it is possible to supply the AC input power to the load without passing through the uninterruptible power supply, and therefore maintenance and inspection of the uninterruptible power supply can be performed.

  That is, in the above operation, the maintenance bypass circuit cannot be switched to the maintenance bypass circuit collectively by the maintenance bypass circuit changeover switch 41a as in the conventional example, but basically the system can be simplified and the space can be reduced without impairing the functions of the conventional system. Reduction has been achieved.

  FIG. 2 is a block diagram of an uninterruptible power supply system according to Embodiment 2 of the present invention. About each part of this Example 2, the same part as each part of the uninterruptible power supply system which concerns on Example 1 of this invention of FIG. 1 is shown with the same code | symbol, and the description is abbreviate | omitted. The difference between the second embodiment and the first embodiment is that three mechanical switches, a total of six mechanical switches including output switches 31a, 31b and 31c and maintenance bypass circuit switches 31d, 31e and 31f in the output panel 31, are provided. This is a configuration in which the mechanical switches 31g, 31h, and 31i are replaced.

  As described above, in order to check the uninterruptible power supply 11 in the first embodiment, the maintenance bypass circuit switch 31d is turned on and the output switch 31a is opened. The function of the set of the maintenance bypass circuit switch 31d and the output switch 31a can be replaced with a double throw mechanical switch 31g. Similarly, the functions of the set of the maintenance bypass circuit switch 31e and the output switch 31b and the set of the maintenance bypass circuit switch 31f and the output switch 31c can be replaced with the double throw type mechanical switches 31h and 31i, respectively. When the uninterruptible power supply system does not allow instantaneous interruption of load power supply at the time of switching, an overlap type double-throw type mechanical switch 31g, 31h and 31i may be used.

  Thus, by using a double throw mechanical switch, it is possible to further reduce the number of parts and reduce the installation space.

11, 12, 13 Uninterruptible power supply 11a, 12a, 13a Bypass side switch 11b, 12b, 13b Inverter side switch 21, 22, 23 Input transformer panel 31, 32 Output panel 31a, 31b, 31c, 32a, 32b, 32c Output switches 31d, 31e, 31f Maintenance bypass circuit switches 31g, 31h, 31i Double-throw mechanical switch 41 Maintenance bypass board 41a Maintenance bypass circuit selector switches 51, 52 Output branch board

Claims (2)

A plurality of uninterruptible power supplies, each powered by an AC power supply;
An uninterruptible power supply system comprising at least one output panel having a parallel bus for connecting the outputs of the uninterruptible power supply devices in parallel via output switches, respectively.
The output board is
An uninterruptible power supply system comprising a maintenance bypass switch that connects each of the AC power supplies and the parallel bus, and the parallel bus is shared with the maintenance bypass switch connection bus. Each set of the output switch for the uninterruptible power supply and the maintenance bypass switch connected to the parallel bus from an AC power supply that feeds the uninterruptible power supply,
The uninterruptible power supply system according to claim 1, wherein each is replaced with a double-throw mechanical switch.

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