JP2005151688A - Uninterruptible power supply device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To realize the reduction of an installation space by reducing the number of board faces of an uninterruptible power supply device board while maintaining the safety of maintenance and inspection work in the uninterruptible power supply device provided with a function of a direct power supply circuit and a function of a maintenance bypass circuit. <P>SOLUTION: A connector is provided to a stand to which an AC switch circuit is mounted. The stand with the connector is made as a drawer-type AC switch stand. The AC switch stand is inserted to the direct power supply circuit. Consequently, the function of the direct power supply circuit and the function of the maintenance bypass circuit, which are conventionally two systems, are integrated into the direct power supply/maintenance circuit of one system. Further, the direct power supply/maintenance circuit is stored in a frame and separated from the other circuits. As a result, even if the frame and a power converter are stored in one board, the safety of the maintenance and inspection work of the power converter and an AC switch can be secured while feeding power to a load. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an uninterruptible power supply apparatus that simplifies the panel configuration of an uninterruptible power supply apparatus that includes a direct feed power supply circuit and a maintenance bypass circuit, and that improves safety during maintenance and inspection.

FIG. 5 is a block circuit diagram showing a conventional example of an uninterruptible power supply device having a direct power feeding circuit and a maintenance bypass circuit. In FIG. 5, AC power from the commercial power source 1 is input to the power converter 24 through the breakers 25 and 27, the contactor 211, and the filter 215. The power converter 24 converts AC power into DC power. And a power converter (inverter) that converts the DC power into AC power having a desired voltage and frequency. The AC power obtained by the power conversion device 24 is supplied to the load 2 through the filter 216, the contactor 213, the transformer 218, and the breaker 28. A circuit for supplying AC power from the commercial power source 1 to the load 2 via the power conversion device 24 is hereinafter referred to as a line 3.
If the load 2 is, for example, a computer, it is necessary to avoid a power outage for a very short time, but the commercial power source 1 may be out of power due to a line failure (for example, a ground fault). Therefore, when the commercial power source 1 fails, the DC power stored in the battery 23 is given to the inverter (power converter 24) via the breaker 210 and the contactor 212, and this inverter converts the DC power into AC power. Thus, the load 2 can continue to operate without a power failure.

  However, for example, if the inverter portion of the power converter 24 fails, AC power cannot be supplied to the load 2 even if the commercial power source 1 and the battery 23 are healthy. Therefore, an AC switch circuit composed of a parallel circuit of an AC switch 217 and a contactor 214 formed by reverse parallel connection of thyristors is provided, and the commercial power source 1 is connected to the transformer 218 via the breaker 26 and the AC switch circuit. A direct feed circuit is provided. Normally, the AC switch circuit is off, and the power converter 24 supplies AC power to the load 2 (however, the output AC of the power converter 24 is in synchronization with the commercial power supply 1). If a failure of the power conversion device 24 is detected, the output is immediately turned off and the AC switch circuit is turned on, so that a power failure of the load 2 can be avoided. This direct feed circuit will be referred to as line 2 below.

However, if the power conversion device 24 or the AC switch circuit fails for a long time, the load 2 has to be out of power. Therefore, it is necessary to periodically inspect and replace parts. However, since a voltage is applied to the line 2 during the operation of the line 3, there is a danger in maintenance and inspection work of the AC switch circuit. Further, since the voltage is applied to the line 3 during the operation of the line 2, there is a danger in the maintenance / inspection work of the power conversion device 24. Therefore, a maintenance bypass circuit for supplying AC power from the commercial power source 1 to the load 2 through the transformer 219 and the breaker 29 is provided. This maintenance bypass circuit will be referred to as line 1 below.
By doing so, when the equipment of line 2 or line 3 is maintained and inspected, the breaker 29 is turned on and the AC power is supplied to the load 2 by the line 1, but at this time, the breakers 25, 26 and Since line 2 and line 3 become non-voltage by turning off 28, maintenance / inspection work can be performed safely.

By the way, such an uninterruptible power supply is composed of a transformer having a large mass, devices such as a power converter and an AC switch that need to be maintained and inspected at an appropriate time, and various types constituting the lines 1 to 3. Since it consists of a switch, the uninterruptible power supply panel for storing these is a combination of multiple panels. Various proposals have been made for the structure of the uninterruptible power supply panel having such a configuration (see, for example, Patent Document 1).
FIG. 6 is an external view showing the external appearance of a conventional uninterruptible power supply panel that houses the uninterruptible power supply of the conventional circuit described above in FIG. This conventional uninterruptible power supply panel includes a battery panel 221 storing a portion C enclosed by a one-dot chain line in the conventional circuit described above with reference to FIG. 5, and B (that is, line 2) surrounded by a one-dot chain line in the conventional circuit. 3 of the power conversion device panel 222 storing the portion of the line 3) and the maintenance bypass panel 223 storing the portion A (that is, the line 1, the power source side breaker, and the load side breaker) surrounded by the one-dot chain line in the conventional circuit. It becomes surface composition. Thus, by storing the lines 2 and 3 in the power converter panel 222 and storing the line 1 in the maintenance bypass panel 223, maintenance and inspection of the power converter 24 and the AC switch circuit can be performed safely. . Reference numeral 301 denotes a handle for opening and closing the front door of each panel, and reference numeral 302 denotes a ventilation hole provided in the front door.

FIG. 7 is an internal mounting diagram showing the arrangement of devices housed in the power converter panel and the maintenance bypass panel. FIG. 7A is a front view of the power converter panel 222 and the maintenance bypass panel 223. 7 (B) shows the mounting condition of the equipment when the power converter panel 222 is viewed from the left side, and FIG. 7 (C) shows the maintenance bypass panel 223 from the right side. It shows the mounting status of the equipment at the time. 7 are the same as those used for the conventional circuit described above with reference to FIG. As shown in FIG. 7, the AC switch 217 constituting the line 2, the contactor 214 in parallel therewith, and the contactor 213 constituting the line 3 are installed on the front side of the power converter panel 222. The breakers 25, 26, 27, 28 are installed on the front side of the maintenance bypass board 223 to facilitate operation.
JP 2003-116206 A

  However, as shown in FIG. 6, the conventional uninterruptible power supply panel is composed of two surfaces of the power converter panel 222 and the maintenance bypass panel 223 (excluding the battery panel 221). There are disadvantages that become necessary, and there are also disadvantages that extra members are required for the two-sided configuration.

Therefore, in order to eliminate such drawbacks, in the present invention, instead of the conventional direct feed power supply circuit and the maintenance bypass circuit, a direct feed power supply / maintenance circuit is provided. The AC switch base is a circuit in which an AC switch base is inserted between the load and the AC switch base. The AC switch base is configured so that the AC switch and its associated devices can be attached and detached together by a connector.
The power converter is connected to a first winding of a three-winding transformer having three windings, the direct feed / maintenance circuit is connected to the second winding, and the load is connected to the third winding. Connecting.
The direct power feeding / maintenance circuit is provided with a cover for separating it from other electric circuits.
This cover has a structure that can prevent intrusion of foreign substances and ensure air permeability.
The AC switch base is structured to allow operation of equipment mounted on the AC switch base and attachment / detachment of the AC switch base from the front side.

  In the present invention, by using an AC switch stand having a connector, what has conventionally been provided with two systems of a direct power feeding circuit and a maintenance bypass circuit can be combined into a single direct power feeding / maintenance circuit. Even if the uninterruptible power supply panel is composed of only one surface (excluding the battery panel), maintenance and inspection can be performed safely, so that the installation space for the uninterruptible power supply panel can be reduced. In addition, the use of a three-winding transformer and the provision of a cover that separates the direct feed / maintenance circuit from other electrical circuits also contributes to improved safety and downsizing of the panel.

  When performing maintenance / inspection of the uninterruptible power supply or replacement of parts during operation of the uninterruptible power supply, supply AC power to the load via the maintenance bypass circuit, and power conversion with the line 2 including the AC switch The line 3 including the device was secured with no voltage, so that the safety of the work was ensured. For this purpose, the uninterruptible power supply panel had to be configured in two planes. In the present invention, by pulling out an AC switch base provided with a connector, the AC switch can be inspected and maintained in a non-voltage state, and the power converter supplies AC power to the load during that time. Also, since the direct power supply / maintenance circuit including the AC switch stand is covered with a cover that is separated from other electrical circuits, it is also necessary to check the power converter while the direct power supply / maintenance circuit is supplying power. Can be secured. Furthermore, the number of large mass transformers can be reduced by connecting the power converter, the direct power feeding / maintenance circuit, and the load with a three-winding transformer.

FIG. 1 is a block circuit diagram showing a first embodiment of the present invention. The commercial power source 1, load 2, battery 23, two sets of power converters 24, three breakers 27 to 27 shown in FIG. 29, breaker 210, four contactors 211 to 214, filters 215 and 216, and AC switch 217 have the same names, uses, and functions as those of the conventional circuit described in FIG. Is omitted.
In the first embodiment, a parallel circuit of an AC switch 217 and a contactor 214 and a breaker 29 are collectively mounted on an AC switch base to form a unit. The AC switch base includes a power supply side connector 16 and a load side connector 17. Provided. Since the direct power feeding / maintenance circuit (the portion surrounded by the broken line E) configured by inserting this AC switch base between the commercial power source 1 and the load 2 can easily attach and detach the AC switch base. Only one direct power supply / maintenance circuit can serve as a conventional direct power supply circuit and maintenance bypass circuit that require two systems. Further, by connecting the direct feed / maintenance circuit, the circuit including the power conversion device 24, and the load 2 with a three-winding transformer 15, transformers 218, 219 that conventionally required two transformers (FIG. 5). Reference) can be made one. Reference numeral 14 denotes an optional transformer, which is used only when necessary. That is, when the commercial power source 1 is a power source for the power converter 24 and at the same time a power source for a direct power feeding / maintenance circuit, the optional transformer 14 can be omitted.

  FIG. 2 is an external view showing the appearance of the uninterruptible power supply panel that houses the circuit of the first embodiment of FIG. 1, and is a battery board 221 that houses the portion C surrounded by the dashed line in the embodiment circuit. (The same as the case of the conventional example shown in FIG. 6) and the power converter device panel 18 that accommodates the portion surrounded by the alternate long and short dash line D in the circuit of the first embodiment.

FIG. 3 is an internal mounting diagram of the power conversion device board showing the second embodiment of the present invention, and FIG. 3 (A) shows the mounting state of the equipment when the power conversion device board 18 is viewed from the front. FIG. 3B shows a mounting state of the device when the power conversion device panel 18 is viewed from the right side. 3 are the same as those used for the first conventional circuit described above with reference to FIG.
In the second embodiment of FIG. 3, the power converter 24 is installed on the upper side of the power converter panel 18 and the devices constituting the direct power feeding / maintenance circuit (enclosed by a broken line E in FIG. 1) below the power converter 24. A frame 19 that houses the left part) is installed. When the power converter 24 installed on the upper part of the frame 19 is inspected by covering the frame 19 with a material that is breathable and prevents entry of foreign matter, such as a wire mesh or a perforated plate, screws and parts Falls and prevents a grounding accident or a short-circuit accident from occurring inside the frame 19, and even if the direct feed power supply / maintenance circuit is supplying power to the load 2, this cover can maintain the power converter 24. -Inspection work can be performed safely.

FIG. 4 is an internal mounting diagram of the frame shown in FIG. 3 showing the third embodiment of the present invention. FIG. 4A shows the mounting status of the equipment when the frame 19 is viewed from the front. (B) represents the mounting state of the device when the frame 19 is viewed from the right side. 4 are the same as those in the first embodiment circuit of FIG. 1 or the second embodiment of FIG.
In FIG. 4, both side surfaces, the back surface, and the top surface of the frame 19 are covered with a breathable cover so as not to touch the charging portion inside the frame 19, and the optional transformer 14 and 3 windings are included inside. The line transformer 15 is accommodated. An AC switch base 112 is attached to the upper part of the front side of the frame 19, and a breaker 28 is attached immediately below it. Furthermore, a terminal cover 115 is provided on the external line terminal block provided below these to prevent them from inadvertently touching the charging unit.

  The AC switch base 112 is fixed to the frame 19 with the mounting screw 111. In this state, the AC switch base 112 is inserted into the direct power feeding / maintenance circuit by the power supply side connector 16 and the load side connector 17. In addition, the AC switch base 112 can be easily attached and detached because it can be pulled out if the mounting screw 111 is loosened. An AC switch 217, a contactor 214, and a breaker 29 are installed on the front side of the AC switch base 112, and these are covered with a cover 113.

1 is a block circuit diagram showing a first embodiment of the present invention. 1 is an external view showing the external appearance of an uninterruptible power supply panel that houses the circuit of the first embodiment of FIG. The internal mounting figure of the power converter device board | substrate showing 2nd Example of this invention FIG. 3 shows an internal mounting diagram of the frame shown in FIG. 3 showing the third embodiment of the present invention. Block circuit diagram showing a conventional example of an uninterruptible power supply with a direct feed circuit and a maintenance bypass circuit FIG. 5 is an external view showing the external appearance of a conventional uninterruptible power supply panel that houses the uninterruptible power supply of the conventional circuit described above. Internal mounting diagram showing the layout of equipment stored in the power converter panel and maintenance bypass panel

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Commercial power supply 2 Load 14 Option transformer 15 3 winding transformer 16 Power supply side connector 17 Load side connector 18 Power converter panel 19 Frame 23 Battery 24 Power converter 112 AC switch stand 113 Cover 115 Terminal cover 217 AC switch 221 Battery Panel 222 Power converter panel 223 Maintenance bypass panel

Claims (5)

A power converter connected to an AC power supply and supplying the converted constant voltage / constant frequency AC power to the load; a direct feed circuit for supplying AC power from the AC power supply to the load via an AC switch; In the uninterruptible power supply comprising: a maintenance bypass circuit that supplies AC power from the AC power supply to the load when the power converter or AC switch is stopped,
An AC switch base including the AC switch, a device associated therewith, and a connector for connecting each device to an electric circuit, and a configuration in which the AC switch base is inserted between the AC power source and a load using the connector. An uninterruptible power supply comprising a direct power feeding / maintenance circuit instead of the direct power feeding circuit and the maintenance bypass circuit. In the uninterruptible power supply according to claim 1,
A configuration in which a first winding of a transformer having three windings is connected to the power converter, a second winding is connected to the direct power feeding / maintenance circuit, and a third winding is connected to the load. An uninterruptible power supply comprising a three-winding transformer. In the uninterruptible power supply according to claim 1 or 2,
The direct power feeding / maintenance circuit is provided with a cover that is separated from other electric circuits. In the uninterruptible power supply according to claim 3,
An uninterruptible power supply apparatus characterized in that a cover provided in the direct power feeding / maintenance circuit has a structure capable of ensuring air permeability while preventing entry of foreign matter. In the uninterruptible power supply according to claim 1 to claim 4,
The AC switch base inserted in the direct power feeding / maintenance circuit has a structure capable of operating a device mounted on the AC switch base and attaching / detaching the AC switch base from the front side. .

Images