JP4540171B2 - Uninterruptible power system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an uninterruptible power supply.
[0002]
[Prior art]
Japanese Patent Application Laid-Open No. 11-27877 includes a forward conversion device, an inverse conversion device, and a forward / reverse conversion device. When the forward conversion device and the reverse conversion device fail, the forward / reverse conversion device is regarded as a failed conversion device. A conventional uninterruptible power supply to function is disclosed. Each converter is connected to a power source and a load using a switching device, and is connected to a DC terminal of the storage battery via a switch. In this uninterruptible power supply, if any one of the converters fails, the switch and the switch are operated to disconnect the failed converter from the power supply path, and the remaining converters are used to connect the power supply path. Secure. Therefore, when one conversion device fails or for the purpose of periodic inspection, the predetermined conversion device can be removed in an uninterruptible state.
[0003]
[Problems to be solved by the invention]
However, in this conventional uninterruptible power supply, in order to maintain an uninterruptible state, a voltage may appear at the AC terminal and the DC terminal of the conversion device to be removed. Therefore, if the converter is removed without knowing that a voltage is being applied to the converter to be removed, the operator may get an electric shock.
[0004]
The objective of this invention is providing the uninterruptible power supply device which can remove each converter more safely at the time of a maintenance check and repair.
[0005]
Another object of the present invention is to provide an uninterruptible power supply device that can easily and quickly attach and detach each converter during maintenance and inspection.
[0006]
[Means for Solving the Problems]
The uninterruptible power supply apparatus of the present invention includes an AC terminal and a DC terminal, a forward conversion device that converts AC power into DC power, and an inverse conversion that includes an AC terminal and a DC terminal and converts DC power to AC power. A forward / reverse conversion device comprising an apparatus, an alternating current terminal and a direct current terminal, and, when selected, forward conversion for converting alternating current power to direct current power and reverse conversion for converting direct current power to alternating current power; A storage battery in which one end of the DC terminal is electrically connected to the DC terminal of the device, the DC terminal of the reverse conversion device, and the DC terminal of the forward / reverse conversion device, and the DC terminals of the forward conversion device, the reverse conversion device, and the forward / reverse conversion device and it is equipped with a monitoring device for monitoring the operation state of each converter based on a plurality of voltage appearing at the AC terminal.
[0007]
In the present invention, constituting the monitoring device so that the voltage on the AC terminal and the DC terminals of the converter to be removed for maintenance and inspections are displayed on the display means whether or not it is applied. In order to display whether or not a voltage is applied, the voltage value itself may be displayed on the display means, or only the presence or absence of the voltage may be displayed on the display means. You may make it display with a character, a figure, a sentence, etc. When displaying in this way, the operator can check whether the voltage is applied to the AC terminal and the DC terminal of the converter to be removed by looking at the display on the display means of the monitoring device. There is an advantage that the possibility of electric shock of the operator is greatly reduced.
[0008]
Note the monitoring device, on the basis of a plurality of voltages and determining the need for removal of the converter, voltage Viewing that is applied to the AC terminal及BiTadashi flow terminal of the converter to be that effect and Removal When configured to display on the means, the object to be removed can be clearly recognized, and the workability is further improved.
[0009]
Further, the monitoring device may be configured to display on the display means warnings that the removal of the conversion device will be performed after confirming that the voltage applied to the AC terminal and the DC terminal is zero. The presence of the notes this way, the operator becomes less likely perform the work forgot to confirm the presence or absence of voltage, safety is further increased.
[0010]
In a more specific device, the AC terminal of the forward conversion device is connected to an AC power source via a first switch, and the AC terminal of the reverse conversion device is connected to a load via a second switch. The AC terminal of the device is connected to an AC power source via a first switch and is connected to a load via a second switch. One end of the DC terminal of the storage battery is connected to the DC terminal of the forward conversion device, the DC terminal of the reverse conversion device, and the DC terminal of the forward / reverse conversion device via a switch. In this case, the monitoring device displays on the display means whether or not voltage is applied to the AC terminal and the DC terminal of the conversion device to be removed, and corresponds to the conversion device to be removed. One of the first and second switching devices (located on the input side and the output side) and the switching status of the switch may be displayed. If it does in this way, since the success or failure of the removal conditions of a converter can be judged from the presence or absence of a voltage, and the switching condition of a switch and a switch, safety | security increases.
[0011]
Whether it is necessary to remove the converter based on multiple voltages, and whether the converter can be safely removed based on the voltage applied to the AC and DC terminals of the converter to be removed. If the monitoring device is configured to determine whether or not to display the result on the display means, the safety is further increased.
[0012]
In addition to providing a monitoring device, each conversion device may be provided with a display unit that displays that a voltage is applied to each AC terminal and DC terminal of each conversion device. When such a display unit is provided, the presence / absence of voltage can be confirmed again when performing the removal work, so that the presence / absence of voltage can be displayed to an operator who has forgotten to look at the monitoring device, further increasing safety. .
[0013]
In order to improve safety and workability, it is preferable to adopt a connector structure in which connection wires can be easily attached and detached for connection between the AC terminal and DC terminal of each converter and the switch or switch. When the connector structure is adopted, each conversion device can be attached and detached easily and quickly.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an example of an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a configuration of an example of an embodiment of an uninterruptible power supply apparatus according to the present invention. The uninterruptible power supply device shown in FIG. 1 normally supplies power from an AC power source 1 to a load 11 described later, and supplies power to the load 11 using a storage battery 9 described later as a power source when the AC power source 1 fails. This uninterruptible power supply device includes an AC terminal 3a and a DC terminal 3b, a forward conversion device 3 that converts AC power from the AC power source 1 into DC power, and a DC terminal 5a and an AC terminal 5b that convert DC power into AC power. The forward / reverse conversion device 5 that converts the AC power into the DC power and the reverse conversion device 5 that converts the AC power into the DC power and the reverse conversion operation that converts the DC power into the AC power. A device 7 (hereinafter, these may be simply referred to as a conversion device) is provided. The DC terminal 3b of the forward conversion device 3, the DC terminal 5a of the reverse conversion device 5, and the DC terminal 7b of the forward / reverse conversion device 7 are connected to the DC terminal 9a of the storage battery 9 via three switches SD1 to SD3. . The three switches SD1 to SD3 are normally in a closed state, and are placed in an open state when the corresponding converter is removed.
[0015]
The AC terminal 3 a of the forward conversion device 3 and the AC terminal 7 a of the forward / reverse conversion device 7 are connected to the first switch 13. The first switch 13 normally supplies AC power from the AC power source 1 to the AC terminal 3 a of the forward conversion device 3, and does not supply AC power from the AC power source 1 to the AC terminal 7 a of the forward / reverse conversion device 7. . When the forward conversion device 3 is removed, the alternating current power is supplied from the alternating current power source 1 to the alternating current terminal 7 a of the forward / reverse conversion device 7, and the alternating current terminal 3 a of the forward conversion device 3 is switched off from the alternating current power source 1.
[0016]
The AC terminal 5 b of the reverse conversion device 5 and the AC terminal 7 a of the forward / reverse conversion device 7 are connected to the second switch 15. When power is supplied to the load 11, the second switch 15 normally connects the AC terminal (output terminal) 5 b of the inverse converter 5 to the load 11, and the AC terminal 7 a of the forward / reverse converter 7 is Do not connect to load 11. And the 2nd switch 15 connects the alternating current terminal 7a of the forward / reverse converter 7 to the load 11, when feeding the load 11 and the reverse converter 5 is out of order, and the alternating current of the reverse converter 5 The terminal 5b is switched so as not to be connected to the load 11.
[0017]
The voltage appearing at each AC terminal and each DC terminal of the forward conversion device 3, the reverse conversion device 5, and the forward / reverse conversion device 7 is sent from the voltage measurement points VM1 to VM6 to the monitoring device 17. The monitoring device 17 includes a measurement unit 19, a data processing unit 21, and a display unit 23, and monitors the operation status of each conversion device and displays warnings and necessary work procedures based on the monitoring results. In addition to the voltages from the voltage measurement points VM1 to VM6, various measurement data from other sensors (not shown) are input to the measurement unit 19. The measuring unit 19 has a built-in voltage measuring means for measuring the voltages at the voltage measuring points VM1 to VM6, and the measuring unit 19 includes the current of each unit necessary for monitoring the operation status of each converter. A current measuring means for measuring is also incorporated. The data processing unit 21 converts the measurement data input from the measurement unit 19 into digital data suitable for various arithmetic processes. In the data processing unit 21, various types of data processing such as processing for determining the operation state of the conversion device and processing for creating display data necessary for display on the display unit 23 are performed. For example, based on the voltage at the voltage measurement points VM1 to VM6, etc., it is determined that an abnormality has occurred in any of the converters 3, 5, and 7, and inspection / repair (removal) is necessary. The data processing unit 21 executes data processing for displaying on the display means 23 the voltage applied to the AC terminal and the DC terminal of the conversion device that needs to be removed or displayed on the display means 23. .
[0018]
In this example, the monitoring device 17 is configured to display on the display means whether or not voltage is applied to at least the AC terminal and the DC terminal of the converter to be removed for maintenance and inspection. Whether the voltage is applied or not may be displayed on the display means 23 as the voltage value itself, or only the presence or absence of the voltage may be displayed on the display means 23. You may make it display with a figure, a sentence, etc.
[0019]
FIG. 2 shows an example of the display screen of the display means 23. In this example, when the monitoring device 17 determines the necessity of removing the conversion device based on a plurality of voltages, the fact is displayed as “inverter unit stopped” and “inverter unit stopped”. The data processing unit 21 performs the data processing to be performed. Here, the inverter unit refers to the inverse conversion device 5. Also, in this example, the monitoring device 17 simultaneously displays on the screen the precautions of “Perform maintenance and inspection of the unit according to the instruction manual after confirming that the AC voltage and DC voltage are zero”. For this purpose, the data processing unit 21 performs data processing. Furthermore, in this example, the monitoring device 17 simultaneously performs data processing for displaying the voltage applied to the AC terminal of the conversion device to be removed and the voltage value of the voltage applied to the DC terminal on the screen. Is performed by the data processing unit 21. When the monitoring device 17 is configured to perform these displays, the operator looks at the screen display of the display means 23, and voltage is applied to the conversion device to be removed, the AC terminal and the DC terminal of the conversion device. It can be confirmed whether or not is applied. In other words, when the conversion device is removed, the open / close state of the switch and the switch can be confirmed if the conversion device must be opened. Therefore, if the removal work is performed only when both the AC voltage and the DC voltage are 0 V on the display screen of the display means 23, the risk of an electric shock from the operator is greatly reduced.
[0020]
Instead of displaying AC voltage and DC voltage, when both AC voltage and DC voltage are 0V, it is judged that it can be removed, and for example, “Inverter unit can be removed” is displayed on the screen. When the reverse voltage is applied, the display may indicate that “the first switch is closed and it is dangerous to remove the inverter unit”.
[0021]
Next, a procedure for detaching and installing each converter when the converters of the uninterruptible power supply shown in FIG. 1 are inspected will be described for each converter. First, the removal work of the reverse conversion device 5 will be described. First, the switching unit of the second switch 15 with the inverse conversion device 5 is opened, and the switching unit of the forward / reverse conversion device 7 of the second switch 15 is closed. If it does in this way, supply of the alternating current power from the inverter 5 to the load 11 will stop, and feeding of the alternating current power from the forward / reverse converter 7 which has been in standby operation to the load 11 will be started. At this time, the display means 23 of the monitoring device 17 displays that the voltage value of the AC terminal 5b of the reverse conversion device (inverter unit) 5 is 0 V together with guidance indicating the operation procedure. Next, the switch SD2 connected to the DC terminal 5a of the inverse converter 5 is opened, and the inverse converter 5 is electrically separated. Then, the display means 23 of the monitoring device 17 displays that the voltage value of the DC terminal 5a of the inverse conversion device 5 is 0V along with guidance indicating the operation procedure. A display example of the display means 23 of the monitoring device 17 is as shown in FIG. In FIG. 2, it is displayed on the screen 29 that the voltage value of the AC terminal 5b (AC voltage) and the voltage value of the DC terminal 5a (DC voltage) of the inverse conversion device 5 is 0 V, and the operator The work procedure to be performed next is displayed in characters. Thereby, after confirming that the voltage value of the AC terminal 5b of the reverse conversion device 5 and the voltage value of the DC terminal 5a are displayed as 0 V on the display means 23 of the monitoring device 17, the operator can check the uninterruptible power supply main body. The reverse conversion device 5 is removed.
[0022]
The procedure for attaching the reverse conversion device 5 that has been repaired and inspected to the uninterruptible power supply main body is as follows. First, the open switch SD2 is closed, and the operation such as start / stop and the output voltage are confirmed in the state where the reverse conversion device 5 side of the switching unit of the second switch 15 is open. On the display means 23 of the monitoring device 17, the voltage value of the AC terminal 5b and the voltage value of the DC terminal 5a of the inverse conversion device 5 are displayed together with guidance indicating the operation procedure. Next, the inverse conversion device 5 whose normal operation has been confirmed closes the switching unit on the forward / reverse conversion device 7 side of the second switch 15. As a result, power supply from the reverse conversion device 5 to the load 11 is started, the forward / reverse conversion device 7 enters a standby operation, and the uninterruptible power supply returns to a normal operation state.
[0023]
Removal and mounting of the forward conversion device 3 are performed as follows. First, the switching unit of the first switch 13 connected to the AC terminal 3a of the forward conversion device 3 is opened, and the switching unit connected to the forward / reverse conversion device 7 of the first switch 13 is closed. As a result, the forward / reverse conversion device 7 that has been in standby operation until then performs a conversion operation as a forward conversion device. The forward / reverse conversion device 7 receives power from the AC power supply 1 to charge the storage battery 9 and the conversion operation of the forward conversion device 3 stops. At this time, the display means 23 of the monitoring device 17 displays that the voltage value of the AC terminal 3a of the forward conversion device 3 is 0 V together with the guidance indicating the operation procedure. Next, the switch SD1 is opened to electrically disconnect the forward conversion device 3. The display means 23 of the monitoring device 17 displays that the voltage value of the DC terminal 3b of the forward conversion device 3 is 0 V together with guidance indicating the operation procedure. The operator confirms that the voltage value of the AC terminal 3a and the voltage value of the DC terminal 3b of the forward conversion device 3 are 0V on the display means 23 of the monitoring device 17, and then the reverse conversion device 3 is removed from the uninterruptible power supply main body. Remove.
[0024]
The procedure for attaching the forward conversion device 2 that has been repaired and inspected to the uninterruptible power supply main body is as follows. First, the switching unit connected to the forward conversion device 3 side of the first switching unit 13 is closed, and the operation such as start / stop and the output voltage are confirmed with the switch SD1 opened. The display unit 23 of the monitoring device 17 displays the voltage value of the AC terminal 3a and the voltage value of the DC terminal 3b of the forward conversion device 3 together with guidance indicating the operation procedure. After confirming the normal operation of the forward conversion device 3, the switch SD1 is closed, the switching unit connected to the forward / reverse conversion device 7 of the first switch 13 is opened and the switching unit connected to the forward conversion device 3 is closed. . Then, power supply from the AC power supply 1 to the forward conversion device 3 is started, the forward / reverse conversion device 7 enters a standby operation, and the uninterruptible power supply device returns to a normal operation state.
[0025]
Removal and installation of the forward / reverse conversion device 7 is performed as follows. When the uninterruptible power supply is in a normal operation state, the forward / reverse conversion device 7 performs a standby operation by an inverse conversion operation. Therefore, even if the forward / reverse conversion device 7 breaks down and the operation is stopped, the power supply state of the uninterruptible power supply device does not change. Therefore, when the conversion operation of the forward / reverse conversion device 7 is stopped, the display means 23 of the monitoring device 17 displays that the voltage value of the AC terminal 7a of the forward / reverse conversion device 7 is 0V along with the guidance indicating the operation procedure. Next, the switch SD3 is opened to electrically disconnect the forward / reverse conversion device. The display means 23 of the monitoring device 17 displays that the voltage value of the DC terminal 7b of the forward / reverse conversion device 7 is 0V along with guidance indicating the operation procedure. After confirming that the voltage value of the AC terminal 7a of the forward / reverse conversion device 7 and the voltage value of the DC terminal 7b are 0V on the display means 23 of the monitoring device 17, the operator starts the forward / reverse conversion device 7 from the random power supply main body. Remove.
[0026]
The procedure for attaching the forward / reverse converter 7 that has been repaired and inspected to the uninterruptible power supply main body is as follows. First, the switching unit connected to the forward / reverse converter 7 of the first switch 13 is closed, and the start / stop operation as the forward / reverse converter and the output voltage are confirmed while the switch SD3 is open. Then, the switching unit connected to the forward / reverse conversion device 7 of the first switch 13 is opened, the switch SD3 is closed, and the switching unit of the second switch 15 connected to the forward / reverse conversion device 7 is opened. Performs operations such as starting and stopping as an inverse converter and checking the output voltage. The display unit 23 of the monitoring device 17 displays the voltage value of the AC terminal 7a and the voltage value of the DC terminal 7b of the forward / reverse conversion device 7 together with guidance indicating the operation procedure. Then, the forward / reverse conversion device 7 enters a standby operation, and the uninterruptible power supply device returns to a normal operation state.
[0027]
As described above, the uninterruptible power supply device of the present invention includes a monitoring device that displays the presence or absence of a voltage value applied to the AC terminal and DC terminal of each converter. Since the operator works after confirming that the voltage value of the conversion device to be removed by this monitoring device is 0 V, there is no fear of electric shock.
[0028]
In embodiment mentioned above, the voltage value of the alternating current terminal and direct current terminal of each converter of an uninterruptible power supply is measured by the measurement part 19, and is displayed on the display means 23 of the monitoring apparatus 17 as character information. On the other hand, a display unit such as a light emitting element may be provided in each conversion device to display the voltage values of the AC terminals and the DC terminals with light. For example, when each AC terminal and DC terminal has a voltage, the light emitting diode or the lamp is turned on. When the voltage value of each AC terminal and DC terminal is 0 V, the light emitting diode or the lamp is turned off. To do. FIG. 3 is a block diagram showing a circuit configuration of an example of a conversion device provided with a display unit that displays whether or not a voltage is applied to such an AC terminal and a DC terminal. In FIG. 2, 25 is a conversion device, 27 is a conversion circuit, Dl is a diode, Rl and R2 are resistors, C1 is an electrolytic capacitor, LD1 is a display element made up of a light emitting diode, for example, which displays the voltage state of the DC terminal with light, LD2 Is a display element composed of a light emitting diode that displays the voltage state of the AC terminal with light, and CN1 to CN5 are detachable connection devices having a connector structure to be described later.
[0029]
A case where the configuration and operation of the conversion device 25 in FIG. 3 are applied to the inverse conversion device 5 shown in FIG. 1 will be described as an example. First, the switching unit connected to the inverse conversion device 5 of the second switching unit 15 is opened, and the switching unit connected to the forward / reverse conversion device 7 is closed. If it does in this way, alternating current power will begin to be fed to load 11 from forward / reverse conversion device 7 which carried out standby operation, and conversion operation of reverse conversion device 5 will stop. At this time, since the voltage value of the AC terminal of the inverse conversion device 5 becomes 0 V, the light emitting diode LD2 as the display element is turned off. Next, the switch SD2 is opened to electrically isolate the reverse conversion device 5. Residual charges remain at the DC terminal of the reverse conversion device 5 immediately after being electrically separated, but the residual charges are gradually discharged by the electrolytic capacitor C1 inside the reverse conversion device 5. The light emitting diode LD1 as a display element on the DC terminal side of the reverse conversion device 5 is gradually turned off as the remaining charge is discharged, and is completely turned off when the discharge is completed. The operator knows that the voltage at the AC terminal and the DC terminal of the inverse converter 5 is 0 V because the light emitting diode LD2 on the AC terminal side and the light emitting diode LD1 on the DC terminal side of the inverter 5 are turned off. Therefore, the reverse conversion device 5 is removed from the uninterruptible power supply main body. In addition, confirmation of the presence or absence of the voltage of each converter using the light-emitting diodes LD1 and LD2 described above, and confirmation of the work procedure and voltage value display displayed on the display means 23 of the monitoring device 17 shown in FIG. If performed together, safer attachment / detachment work of the conversion device can be performed. In this example, the light emitting diodes LD1 and LD2 are provided inside the conversion device 25, but may be provided outside the conversion device 25.
[0030]
Moreover, the converter 25 shown in FIG. 3 is equipped with attachment / detachment connection devices CN1 to CN5 having a connector structure at the connection portions of the converter 25 to the main circuit (conversion circuit) of the AC terminal and the DC terminal, respectively. Yes. For example, even if the conversion operation of the reverse conversion device 5 is completely stopped and the voltage applied to the AC terminal and the DC terminal of the reverse conversion device becomes 0 V, the load is applied by the forward conversion device 3 and the forward / reverse conversion device 7. The power supply to 11 is cascaded. In this state, the reverse conversion device 5 is provided in order to remove it safely and easily from the uninterruptible power supply main body. The detachable connection devices CN1 to CN5 may employ a connector configuration in which, for example, a plug is provided in the uninterruptible power supply main body, a jack is provided in the conversion device, and the plug and the jack are fitted. Thereby, a special tool is not required but attachment / detachment of a converter can be performed easily.
[0031]
According to the above embodiment, since the voltage value of the AC terminal and DC terminal of each converter of the uninterruptible power supply device is displayed on the monitoring device together with the guidance including the operation procedure, the AC terminal and DC terminal of each converter is displayed. The applied voltage value can be confirmed at a glance. This eliminates the need for various measuring devices used for attaching / detaching the conversion device, and allows the attachment / detachment operation of each conversion device to be performed safely.
[0032]
In addition, since each conversion device is provided with a display unit that displays the state of the voltage value applied to the AC terminal and the DC terminal, the conversion device may be attached and detached only when the display means is turned off. Can be safely carried out.
[0033]
Furthermore, since the connection part between the AC terminal and the DC terminal of the converter is equipped with a connecting / disconnecting device having a connector structure, the attaching / detaching operation of the converter can be performed easily and quickly, and there is no power outage. The recovery time of the power supply device can be shortened.
[0034]
【The invention's effect】
According to the present invention, the operator can check whether the voltage is applied to the AC terminal and the DC terminal of the conversion device to be removed by looking at the display on the display means of the monitoring device. There is an advantage that the possibility of electric shock to the operator is greatly reduced, and it is possible to remove each converter more safely during maintenance inspection and repair. [Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of an example of an uninterruptible power supply in an embodiment of the present invention.
FIG. 2 is an example of a screen displayed on the display screen of the operation means of the monitoring device of the uninterruptible power supply in the embodiment of FIG.
FIG. 3 is a block diagram showing a configuration when a display unit is provided in the conversion apparatus.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 AC power supply 3 Forward conversion apparatus 5 Reverse conversion apparatus 7 Forward / reverse conversion apparatus 13 1st switching device 15 2nd switching device 17 Monitoring device SD switch LD Light emitting diode (display part)

Claims (5)

A forward conversion device that includes an AC terminal and a DC terminal and converts AC power to DC power;
An inverse conversion device comprising an AC terminal and a DC terminal and converting DC power to AC power;
A forward / reverse conversion device that includes an alternating current terminal and a direct current terminal and performs both operations of forward conversion for converting alternating current power to direct current power and reverse conversion for converting direct current power to alternating current power;
A storage battery in which the DC terminal of the forward conversion device, the DC terminal of the reverse conversion device, and the DC terminal of the forward / reverse conversion device are electrically connected;
A monitoring device that monitors the operating state of each of the conversion devices based on a plurality of voltages appearing at the DC terminal and the AC terminal of each of the forward conversion device, the reverse conversion device, and the forward / reverse conversion device;
The monitoring device displays on the display means whether or not a voltage is applied to the AC terminal and the DC terminal of the converter to be removed for maintenance and inspection, and based on the plurality of voltages, the converter When determining the necessity of removal, it is configured to display the AC terminals and the voltage being applied to said DC terminals of said converter to be that effect and removal on the display means,
Furthermore, each said converter is provided with the display part which displays that the voltage is applied to each said AC terminal and DC terminal, The uninterruptible power supply characterized by the above-mentioned. The monitoring device displays on the display means a warning for performing the removal of the conversion device after confirming that the voltage applied to the AC terminal and the DC terminal is zero. uninterruptible power supply of claim 1 which is configured. The AC terminal of the forward converter is connected to an AC power source via a first switch.
The AC terminal of the inverse conversion device is connected to a load via a second switch.
The AC terminal of the forward / reverse converter is connected to the AC power source via the first switch and to the load via the second switch,
One end of the DC terminal of the storage battery is connected to the DC terminal of the forward conversion device, the DC terminal of the reverse conversion device, and the DC terminal of the forward / reverse conversion device via a switch,
The monitoring device displays on the display means whether or not a voltage is applied to the AC terminal and the DC terminal of the conversion device to be removed, and corresponds to the conversion device to be removed. The uninterruptible power supply apparatus according to claim 1, wherein the first and second switching devices and the switching status of the switches are displayed. A forward conversion device that includes an AC terminal and a DC terminal and converts AC power to DC power;
An inverse conversion device comprising an AC terminal and a DC terminal and converting DC power to AC power;
A forward / reverse conversion device that includes an alternating current terminal and a direct current terminal and performs both operations of forward conversion for converting alternating current power to direct current power and reverse conversion for converting direct current power to alternating current power;
A storage battery in which one end of the DC terminal is connected to the DC terminal of the forward conversion device, the DC terminal of the reverse conversion device, and the DC terminal of the forward / reverse conversion device via a switch, respectively.
A monitoring device that monitors the operating state of each of the conversion devices based on a plurality of voltages appearing at the DC terminal and the AC terminal of each of the forward conversion device, the reverse conversion device, and the forward / reverse conversion device;
The AC terminal of the forward converter is connected to an AC power source via a first switch.
The AC terminal of the inverse conversion device is connected to a load via a second switch.
The AC terminal of the forward / reverse converter is connected to the AC power source via the first switch and to the load via the second switch,
The monitoring device determines the necessity for removal of the conversion device based on the plurality of voltages, and displays the voltage applied to the AC terminal and the DC terminal of the conversion device to be removed. And based on the applied voltage , it is configured to determine whether the conversion device can be safely removed and display the result on the display means,
Furthermore, each said converter is an uninterruptible power supply device provided with the display part which displays that the voltage is applied to each said AC terminal and DC terminal. The uninterruptible power supply of claim 1 or 4 wherein the AC terminals and the DC terminals of each converting device is characterized in that the detachable connection lines has an easy connector structure.

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