JP2022111619A - Uninterrupted power supply switching unit, and test device of uninterrupted power supply switching unit - Google Patents

Abstract

To provide an uninterrupted power supply switching unit which can easily perform operation confirmation of a phase abnormality detection unit, and a test device of the uninterrupted power supply switching device.SOLUTION: An uninterrupted power supply switching unit 1 comprises: a phase abnormality detection unit 20 which detects phase difference between power supply side voltage and load side voltage; voltage conversion units 21, 22 which convert input voltage into desired voltage to be output to the phase abnormality detection unit 20; and connection change units 27a, 27b which change connection states of wiring, in which the connection change units 27a, 27b change the connection states to a use state in which the phase abnormality detection unit detects the phase difference and a test state in which operation confirmation is performed, the voltage conversion units 21, 22 output voltage corresponding to difference between the power supply side voltage and the load side voltage input in a primary side in the use state, and convert voltage from a commercial power supply connection unit 34 input in the primary side into voltage with predetermined magnitude at which the phase abnormality detection unit 20 operates to be output in the test state.SELECTED DRAWING: Figure 1

Description

The present invention relates to an uninterruptible power switching device suitable for use in switching a power supply such as an uninterruptible power supply, and a testing apparatus for the uninterruptible power switching device.

2. Description of the Related Art An uninterruptible power supply (UPS) is known that supplies power from a built-in battery and continues power supply to a load in the event of a power failure or the like. Henceforth, an uninterruptible power supply is also described as a "power supply." Also known is an uninterrupted power supply switching device that can replace the power supply with a new power supply without stopping the power supply to the load.

When replacing a power supply device using this uninterruptible power supply switching device, it is necessary that the phase of the voltage of the power supply device before replacement and the phase of the voltage of the power supply device after replacement match. For this reason, there is known an uninterrupted power supply switching apparatus having a synchronization control circuit that controls the phase of the voltage of the power supply to enable switching even if the power supply is out of sync (for example, Patent Document 1). reference.).

In addition, a sensor for comparing the voltage phase between the wiring lines is installed on the bus in the switch of the circuit, and when the phase of the voltage between the lines on both sides of the switch is different, the switch is automatically prohibited from turning on. A multi-circuit switch is also known (see, for example, Patent Document 2).

Japanese Patent No. 3664902 JP-A-6-296331

When the power supply unit is replaced by using the uninterruptible power supply switching device as described above, the work is performed without stopping the power supply to the load. Specifically, first, while power is being supplied to the load from the power supply unit before replacement, the outputs of the power supply unit before replacement and the new power supply unit after replacement are input to the hitless power supply switching device. Then, after the uninterruptible power switching device operates the uninterruptible power switching device to supply power from the old power source device to the load, the power is supplied from the new power source device to the load. Switch to a state in which power is supplied.

During this work, the phase of the voltage output from the uninterruptible power supply switching device differs from the phase of the voltage of the power supplied to the load due to, for example, incorrect wiring. If the output from the device is supplied to the load, a short circuit accident will occur. Therefore, before supplying the output of the uninterrupted power switching device to the load, the voltage phase of the power supply supplying power to the load and the phase of the uninterrupted power switching device A phase abnormality detector is provided for comparing the phases of the voltages output from. Then, when the phase abnormality detection unit detects that the phases of the two voltages are different, control is performed to prohibit the closing of the circuit breaker provided at the output stage of the uninterruptible power supply switching device. done. That is, when the voltage of the power supply device before replacement is out of phase with the voltage output from the uninterruptible power supply switching device, the phase abnormality detection section regulates the circuit breaker from being energized. This prevents voltages out of phase from being output from the hitless power supply switching device.

However, if the phase abnormality detector does not operate properly due to a cause such as a failure, there is a possibility that the closing of the circuit breaker will not be prohibited even if the phases of the two voltages are different. For this reason, before using the uninterrupted power supply switching device, it is confirmed that the phase abnormality detector operates correctly.

In order to confirm the operation of the phase abnormality detection section, it is necessary to actually input voltages having different phases to the phase abnormality detection section. However, since the voltage of the power supply device using the uninterruptible power switching device is often 200V or 400V, a dedicated power supply must be prepared for checking the operation, and the checking work can be easily performed. may not be possible.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an uninterrupted power switching device capable of easily confirming the operation of a phase abnormality detection unit, and a test of the uninterrupted power switching device. Regarding the device.

In order to achieve the above object, the present invention provides the following means.
A hitless power switching device of the present invention is a hitless power switching device used for switching a power supply device that supplies power to a load. provided between the power supply side and the load side, and an energized state in which current flows between the power supply side and the load side; and an interrupted state in which the current flow between the power supply side and the load side is interrupted. a reversibly switching short-circuit prevention unit; and a phase abnormality that detects a phase difference between a power-supply-side voltage in the short-circuit prevention unit and a load-side voltage in the short-circuit prevention unit. A detection unit, a voltage conversion unit that converts the voltage input to the primary side into a desired voltage and outputs the voltage to the phase abnormality detection unit connected to the secondary side, and connection of wiring connected to the voltage conversion unit. a connection changing unit for changing a state; and a commercial power connection unit connected to a commercial power supply, wherein the connection changing unit changes the connection state of the wiring to a use state in which the phase error detection unit detects the phase difference. and a test state in which the operation of the phase abnormality detection unit is confirmed. A voltage corresponding to the difference of the load side voltage is output, and in the case of the test state, the voltage from the commercial power connection unit input to the primary side is a predetermined magnitude at which the phase abnormality detection unit operates. Converts to voltage and outputs.

According to the uninterruptible power supply switching device of the present invention, when the connection changer changes the connection state of the wiring connected to the voltage conversion unit to the test state, the voltage of the commercial power supply changes to the predetermined level at which the phase abnormality detection unit operates. It is converted into a voltage of magnitude and output to the phase anomaly detector. Therefore, only by changing the connection state of the wiring by the connection changing unit, it is possible to check the operation of the phase abnormality detecting unit using the commercially available power supply.

In the above invention, it is preferable that a cutoff section capable of reversibly cutting off current from the commercial power supply is provided between the commercial power supply connection section and the voltage conversion section.
By doing so, when an excessive current flows from the commercial power source, the cutoff section cuts off the current. Therefore, it is possible to prevent an excessive current from flowing unintentionally from the commercial power source. In addition, since the cutoff section reversibly cuts off the current from the commercial power source, it is possible to easily restore power after removing the cause of the overcurrent.

In the above invention, it is preferable that the connection changing section includes a changeover switch that changes wiring connected to the primary side of the voltage converting section.
In this way, the use state and the test state can be switched simply by switching the changeover switch. Therefore, it is possible to check the operation of the phase abnormality detection section with a simple work.

A testing apparatus for an uninterrupted power supply switching device of the present invention is provided between a power supply side to which a power supply device is connected and a load side to which a load to which power is supplied from the power supply device is connected. a short-circuit prevention unit that reversibly switches between an energized state in which a current flows between the power source and the load side and a cut-off state in which the current flow between the power supply side and the load side is interrupted; and a phase abnormality detection unit that detects a phase difference between a power supply side voltage that is the power supply side voltage in the short circuit prevention unit and a load side voltage that is the load side voltage in the short circuit prevention unit, and supplies power to the load A testing device for an uninterrupted power supply switching device for switching the power supply, comprising: a commercial power supply connection unit connected to a commercial power supply; It is equipped with a test transformer that

According to the testing apparatus for the uninterrupted power supply switching device of the present invention, the voltage of the commercial power supply is converted by the test transformer into a voltage with a magnitude that causes the phase abnormality detection section to operate. By inputting the converted voltage to the phase abnormality detector, it is possible to easily confirm the operation of the phase abnormality detector.

In the above invention, it is preferable that a cutoff section capable of reversibly cutting off current from the commercial power supply is provided between the commercial power supply connection section and the test transformer.
By doing so, for example, when an excessive current flows from the commercial power source, the cutoff section cuts off the current from the commercial power source. Therefore, it is possible to prevent an excessive current from flowing unintentionally from the commercial power source. In addition, since the cutoff section reversibly cuts off the current from the commercial power source, it is possible to easily restore power after removing the cause of the overcurrent.

According to the uninterruptible power switching device and the testing apparatus for the uninterrupted power switching device of the present invention, it is possible to easily confirm the operation of the phase abnormality detection unit of the uninterrupted power switching device.

FIG. 3 is a block diagram illustrating an overview of replacement work of an uninterruptible power supply using the uninterruptible power supply switching device of the first embodiment; 1 is a block diagram illustrating the configuration of an uninterrupted power switching device according to a first embodiment; FIG. FIG. 3(a) is a block diagram for explaining the operation of the phase abnormality detection unit of the hitless power supply switching device of the first embodiment when the phases are the same. FIG. 3B is a block diagram for explaining the operation of the phase abnormality detection unit of the uninterrupted power supply switching device of the first embodiment when a phase abnormality occurs. 4 is a block diagram illustrating a phase abnormality detection section in a test state of the uninterrupted power switching device of the first embodiment; FIG. FIG. 11 is a block diagram illustrating a phase abnormality detection unit in a test state of the hitless power supply switching device according to the modification of the first embodiment; It is a figure explaining the test apparatus of the hitless power supply switching apparatus of 2nd Embodiment.

[First Embodiment]
A hitless power supply switching device 1 according to a first embodiment of the present invention will be described below with reference to FIGS. 1 to 5. FIG.

The uninterruptible power supply switching device 1 of the present embodiment can replace an uninterruptible power supply that supplies power to a load such as an ICT device with a new uninterruptible power supply without stopping power supply to the load. It is a power switching device that can be used. In this embodiment, the uninterruptible power supply switching device 1 is used for the work of replacing the existing uninterruptible power supply 4A with the newly installed uninterruptible power supply 4B without momentarily interrupting the power supply to the ICT devices 6a to 6c. The following description will be given by taking the case of use as an example (see FIG. 1). In the following description, the work of replacing the existing uninterruptible power supply 4A with the new uninterruptible power supply 4B is also simply referred to as "replacement work". Also, the ICT devices 6a to 6c are collectively referred to as "ICT device 6".

In this embodiment, the uninterruptible power supply 4A and the uninterruptible power supply 4B are applied to an example of an uninterruptible power supply that outputs an AC voltage of 200V. note that. The uninterruptible power supply 4A and the uninterruptible power supply 4B may be an uninterruptible power supply that outputs an AC voltage of 400V. Alternatively, it may be an uninterruptible power supply that outputs AC voltage of another magnitude.

1. Description of Configuration The uninterrupted power switching device 1 is mainly composed of a main body 10 and a test kit 30 . The main body 10 includes non-trip switches 11A and 11B, circuit breakers 12A and 12B for wiring, switching section 13, circuit breaker for wiring 14, input sections 15A and 15B, output section 16, external power supply terminals 17a and 17b, and phase abnormality detection. It mainly includes a portion 20 (see FIG. 2). Further, the main body 10 includes an input power source phase detector (not shown) for detecting a difference in phase between the powers input from the input section 15A and the input section 15B.

The test kit 30 is a test cable kit used for checking the operation of the phase abnormality detection section 20 . The test kit 30 is mainly provided with a cable 31 connected to one phase of a 100V commercial power supply, a cable 32 connected to the other phase, and a circuit breaker 33 . Each end of the cables 31 and 32 on the commercial power supply side is provided with a commercial power connection 34 for connection to a 100V commercial power supply, and each opposite end is provided with a commercial power supply connector 34 for connection to the main body 10 . is provided. Well-known connection terminals are used for the commercial power supply connection portion 34 and the connection portion 36, respectively.

The cable 31 is branched into a cable 31a and a cable 31b from a predetermined location on the connecting portion 36 side. Similarly, the cable 32 is branched into a cable 32a and a cable 32b from a predetermined location on the connecting portion 36 side. Between the commercial power connection portion 34 of the cable 31 and a predetermined location where the cable 31a and the cable 31b are branched, and between the commercial power connection portion 34 of the cable 32 and a predetermined location where the cable 32a and the cable 32b are branched. A circuit breaker 33 for wiring is provided between them. The circuit breaker 33 for wiring is a known circuit breaker for wiring (MCCB) that switches from an energized state to a cut-off state when a current greater than a predetermined current value flows. Note that the circuit breaker 33 for wiring is an example of a breaker.

<Explanation of main unit>
15 A of input parts are parts into which the electric power output from 4 A of existing uninterruptible power supplies is input. The input unit 15A is electrically connected by a cable 52 to a branch board 41A provided on the output side of the uninterruptible power supply 4A during replacement work. The input unit 15B is a portion to which power is input from the newly installed uninterruptible power supply 4B. During replacement work, the input unit 15B is electrically connected by a cable 54 to a branch board 41B provided at the output unit of the uninterruptible power supply 4B.

The output section 16 is a section that outputs either power input from the input section 15A or the input section 15B. The output unit 16 is connected to the distribution board 5 by a cable 53 during replacement work. Hereinafter, the side on which the input sections 15A and 15B of the main body 10 are provided is also referred to as the "power supply side", and the side on which the output section 16 is provided is also referred to as the "load side".

Moreover, the state of the main body 10 when the uninterruptible power supply 4A and the uninterruptible power supply 4B are being replaced is also referred to as "usage state". In addition, the state of the main body 10 when the operation is checked before the replacement work, which will be described later in detail, is also referred to as the “test state”.

The external power supply terminals 17a and 17b are portions to which power cables (not shown) are connected, and are portions to which electric power necessary for operating the main body 10 is input. The non-trip switch 11A is a known switch provided on the side of the input section 15A. The non-trip switch 11B is a known switch provided on the side of the input section 15B.

The wiring circuit breaker 14 is a known wiring circuit breaker (MCCB) provided on the output section 16 side. When a predetermined operation is performed, the circuit breaker 14 has two states: an energized state in which current flows between the power supply side and the load side, and an interrupted state in which the current between the power supply side and the load side is interrupted. switches reversibly. When the circuit breaker for wiring 14 is energized, the power input from the input section 15A or the input section 15B is output from the output section 16 . When the circuit breaker 14 for wiring is in an interruption state, the electric power input from the input section 15A or the input section 15B is cut off by the circuit breaker 14 for wiring.

The circuit breaker 14 for wiring has a function of switching to an interrupted state and regulating switching from an interrupted state to an energized state when an abnormality signal is input from a phase abnormality detector 20, which will be described later in detail. In addition, the circuit breaker 14 for wiring is an example of a short-circuit prevention part.

The switching unit 13 is a known wiring switching device provided on the power supply side of the circuit breaker 14 for wiring. The switching unit 13 switches between a state in which the input unit 15A and the circuit breaker 14 are electrically connected and a state in which the input unit 15B and the circuit breaker 14 are electrically connected. In other words, the source of power output from the output unit 16 is switched between the uninterruptible power supply 4A and the uninterruptible power supply 4B.

The wiring circuit breaker 12A is a known wiring circuit breaker (MCCB) provided between the non-trip switch 11A and the switching unit 13 . The circuit breaker 12B for wiring is a known circuit breaker for wiring (MCCB) provided between the non-trip switch 11B and the switching unit 13 .

The phase abnormality detection unit 20 is a part that detects a phase shift between voltages on the power supply side and the load side of the circuit breaker for wiring 14 . The phase anomaly detector 20 has a function of outputting an anomaly signal notifying that the detected phase shift is greater than or equal to a predetermined range.

The phase abnormality detection section 20 is mainly composed of a transformer 21, a transformer 22, a voltage detection section 23, and connection change sections 27a and 27b. The transformers 21 and 22 are known transformers that convert voltages input to their respective primary sides into voltages that can be operated by a voltage detection section 23, which will be described later in detail, and output the voltages to their secondary sides. Note that the transformer 21 and the transformer 22 are an example of the voltage converter.

The transformer 21 has a voltage input section 24a, a test voltage input section 25a, and a voltage input section 26a on its primary side (see FIG. 4). The voltage input section 24a is a section that is connected to one phase of the voltage on the power supply side of the circuit breaker for wiring 14 in use. The test voltage input section 25a is a section that is connected to one phase of the 100V commercial power supply input from the test kit 30 in the test state. The voltage input section 26a is a section that is connected to a phase different from the phase to which the voltage input section 24a is connected, of the voltage on the power supply side of the circuit breaker for wiring 14 when in use. The voltage input section 26a is a section that is connected to the other phase of the 100 V commercial power supply input from the commercial power supply connection section 34 in the test state.

The transformer 22 similarly has a voltage input section 24b, a test voltage input section 25b, and a voltage input section 26b on its primary side (see FIG. 4). The voltage input part 24b is a part that is connected to one phase of the voltage on the load side of the circuit breaker 14 in use. The test voltage input section 25b is a section that is connected to the phase to which the voltage input section 26a is connected among the phases of the commercial power supply input from the test kit 30 in the test state. The voltage input portion 26b is a portion that is connected to a phase different from the phase to which the voltage input portion 24b is connected, of the voltage on the load side of the circuit breaker for wiring 14 in use. The voltage input section 26b is a section that is connected to the phase to which the test voltage input section 25a is connected among the phases of the commercial power supply input from the test kit 30 in the test state.

In this embodiment, in use, the voltage input section 24a is connected to the _U01 phase of the circuit breaker 14 on the power supply side of the wiring cable 28a, and the voltage input section 26a is connected to the circuit breaker for wiring via the wiring cable 29a. The following description will be given by taking as an example the case where the power supply is connected to the _W01 phase on the power supply side of 14 . The voltage input unit 24b is connected to the _U0 phase on the load side of the circuit breaker for wiring 14 via the wiring cable 28b, and the voltage input unit 26b is connected to the W phase for the load side of the circuit breaker for wiring 14 via the wiring cable 29b. The following description will be made by taking as an example the case of connection to phase ₀ (see FIGS. 2 and 3A).

The connection change sections 27a and 27b are sections that switch wirings connected to the primary sides of the transformers 21 and 22 to switch between the use state and the test state. In the present embodiment, the connection changing units 27a and 27b are applied to an example of a known switching tap provided with a plurality of connection terminals for the following description. That is, when the user changes the connection destination of the wiring connected to the connection changing units 27a and 27b, the wiring connected to the primary side of each of the transformers 21 and 22 is changed, and the use state and the test state are changed. is switched.

The connection changing portion 27 a is a portion that changes the connection destination of the wiring connected to the primary side of the transformer 21 . Wiring is connected to the connection changing portion 27a so that 200 V, which is the voltage on the power supply side of the circuit breaker 14 for wiring, is input to the primary side of the transformer 21 in the state of use. Also, in the test state, the wiring is connected so that the 100 V commercial power supplied from the test kit 30 is input to the primary side of the transformer 21 .

The connection changing part 27b is a part that changes the connection destination of the wiring connected to the primary side of the transformer 22 . Wiring is connected to the connection changing portion 27b so that 200 V, which is the voltage on the load side of the circuit breaker 14 for wiring, is input to the primary side of the transformer 22 in the state of use. In the test state, wiring is connected so that the primary side of the transformer 22 receives the 100 V commercial power supplied from the test kit 30 .

Hereinafter, wiring on the primary side of the transformers 21 and 22 in use will be specifically described with reference to FIG. 3(a). When the user switches the wiring of the connection change section 27a to put it into use, the voltage input section 24a of the transformer 21 is connected to the _U01 phase of the circuit breaker 14 on the power supply side via the wiring cable 28a. becomes. Also, the voltage input portion 26a of the transformer 21 is connected to the _W01 phase on the power supply side of the wiring breaker 14 through the wiring cable 29a.

Also, the voltage input portion 24b of the transformer 22 is connected to the _U0 phase on the load side of the circuit breaker 14 for wiring through the wiring cable 28b. Also, the voltage input portion 26b of the transformer 22 is connected to the _W0 phase on the load side of the circuit breaker 14 for wiring through the wiring cable 29b. The _{U0 phase corresponds to the U01 phase of the circuit breaker for wiring 14 on the power supply side, and the W0 phase corresponds} to the _W01 phase of the circuit breaker for wiring 14 on the power supply side.

Further, hereinafter, wiring on the primary side of the transformers 21 and 22 in the test state will be described with reference to FIG. When the user switches the wiring of the connection changing unit 27a to set the test state, the cable 31a connected to one phase of the 100V commercial power to which the test kit 30 is connected is connected to the test voltage input unit 25a. , the cable 31b is connected to the voltage input section 26b. Also, the cable 32a connected to the other phase is connected to the voltage input section 26a, and the cable 32b is connected to the test voltage input section 25b.

The transformer 21 is configured such that the magnitude of the voltage on its secondary side is the same between the use state and the test state. That is, the magnitude of the voltage on the secondary side when an AC voltage of 200 V is input between the voltage input section 24a and the voltage input section 26a, and the AC voltage of 100 V between the test voltage input section 25a and the voltage input section 26a. They are configured so that the magnitude of the voltage on the secondary side when input is the same. Similarly, the transformer 22 is configured so that the magnitude of the voltage on its secondary side is the same between the use state and the test state.

The voltage detection section 23 is a section that detects a voltage difference between both ends thereof and outputs an abnormal signal when the voltage difference exceeds a predetermined threshold value. In the present embodiment, the voltage detection unit 23 is applied to an example in which the voltage detection unit 23 is a voltage sensitive relay that operates when the voltage difference between both ends becomes larger than a predetermined threshold value, and the following description will be given. The voltage detection unit 23 may be another known device or the like that operates when a predetermined voltage difference occurs and outputs a signal notifying that.

One end of the voltage detection section 23 is connected to the voltage output section 44 a on the secondary side of the transformer 21 . The other end of the voltage detection section 23 is connected to the voltage output section 44 b on the secondary side of the transformer 22 . The voltage output section 46a on the secondary side of the transformer 21 and the voltage output section 46b on the secondary side of the transformer 22 are connected to each other so as to have the same potential (FIGS. 3A and 3B). reference.). The voltage output section 44a and the voltage output section 44b, and the voltage output section 46a and the voltage output section 46b are sections to which corresponding voltage phases are output.

When the transformer 21, the transformer 22, and the voltage detection unit 23 are connected in this manner, the voltage detection unit 23 detects a voltage difference caused by a phase shift between the voltage on the power supply side and the voltage on the load side of the circuit breaker 14 for wiring. A voltage is applied. Specifically, when the circuit breaker for wiring 14 is in the cut-off state and the phase of the power supply on the power supply side of the circuit breaker for wiring 14 and the phase of the power supply on the load side are the same, the transformer 21 The voltage on the next side and the voltage on the secondary side of the transformer 22 have the same phase. At this time, no voltage is applied to the voltage detection section 23 because no potential difference occurs between the voltage output section 44a and the voltage output section 44b (see FIG. 3A). That is, the voltage detection unit 23 does not detect the voltage caused by the voltage phase shift.

On the other hand, if the phase of the voltage on the power supply side of the circuit breaker for wiring 14 is different from the phase of the voltage on the load side of the circuit breaker for wiring 14 when the circuit breaker for wiring 14 is in the interrupting state, the potential difference between the voltage output section 44a and the voltage output section 44b is occurs. That is, a phase difference voltage is applied to the voltage detection unit 23 (see FIG. 3B), and the voltage detection unit 23 detects that the phases of the voltages on the power supply side and the load side of the circuit breaker 14 are different. .

2. Description of Operation Next, the uninterruptible power switching device 1 of the present embodiment will be described according to its usage.

(1) Description of Outline of Replacement Work First, mainly with reference to FIG. 1, an outline of replacement work of the uninterruptible power supply 4A and the uninterruptible power supply 4B using the uninterruptible power supply switching device 1 will be described.

In the state before work, the existing uninterruptible power supply 4A is connected to the distribution board 5 via the branch board 41A and the cable 51 to supply power to the ICT device 6 . The uninterruptible power supply 4A receives power from a 200V commercial power supply 2A via an incoming switchboard 3A. A new uninterruptible power supply 4B, which replaces the uninterruptible power supply 4A, receives power from a 200V commercial power supply 2B via an input panel 3B. The commercial power source 2A and the commercial power source 2B may be the same commercial power source.

Before starting the replacement work, the test kit 30 is used to check the operation of the main body 10 . Specifically, the test kit 30 is used to check whether the phase abnormality detection section 20 of the main body 10 operates correctly. The details of checking the operation of the main body 10 using the test kit 30 will be described later.

After confirming that the phase abnormality detector 20 operates correctly, a cable 52 is used to connect the branch board 41A of the uninterruptible power supply 4A and the non-trip switch 11A. Next, a cable 54 is used to connect the branch board 41B of the uninterruptible power supply 4B and the non-trip switch 11B. At this time, the non-trip switch 11A and the non-trip switch 11B are kept open.

Next, a cable 55 connecting the uninterruptible power supply 4B and the distribution board 5 is laid. Also, a cable 53 connecting the main body 10 and the distribution board 5 is laid. At this time, the cables 53 and 55 are not connected to any portion.

Power is supplied to the main body 10 by, for example, connecting a power cable (not shown) to the external power terminals 17a and 17b. Power is preferably supplied to the main body 10 from an uninterruptible power supply different from the uninterruptible power supplies 4A and 4B.

By closing the non-trip switches 11A and 11B and energizing the circuit breaker 14, it is confirmed whether the phases of the power sources of the uninterruptible power supply 4A and the uninterruptible power supply 4B are synchronized. This confirmation is performed by a known input power phase detector (not shown) of the main body 10 . Subsequently, the switching unit 13 is operated to set the power from the uninterruptible power supply 4B to be output from the output unit 16, and it is confirmed that the output voltage from the main body 10 is normal. Also, the switching unit 13 is operated to set the power from the uninterruptible power supply 4A to be output from the output unit 16, and it is confirmed that the output from the main unit 10 is normal. This output is confirmed by connecting a known measuring instrument to the analyzer measuring terminal.

After confirming that there is no abnormality in the output from the main body 10 , the circuit breaker 14 for wiring is set to the cut-off state, and the cable 53 is used to connect the output section 16 to the distribution board 5 . At this time, the switching unit 13 is set to a state in which the power input from the uninterruptible power supply 4A is output from the output unit 16 .

Since power is supplied from the uninterruptible power supply 4A to the distribution board 5 via the cable 51, the voltage of the uninterruptible power supply 4A appears on the load side of the circuit breaker 14 for wiring. state. Further, the voltage of the uninterruptible power supply 4A input from the input section 15A appears on the power supply side of the circuit breaker 14 for wiring.

At this time, for example, if the cable 53 is wired with the wrong phase or the cable 52 is wired with the wrong phase, the phases of the power supply are shifted between the load side and the power supply side of the circuit breaker 14 for wiring. Become. If the wiring circuit breaker 14 is energized in such a state, a short circuit accident will occur. On the other hand, in the main body 10 of the present embodiment, the phase abnormality detection section 20 detects this out-of-phase state and regulates the wiring circuit breaker 14 from being energized, thereby preventing the occurrence of a short-circuit accident. be

Specifically, when the load side and the power supply side of the circuit breaker 14 are out of phase with each other, the phase abnormality detection unit 20 detects the out-of-phase state, that is, phase and output an abnormal signal to the circuit breaker 14 for wiring. The circuit breaker 14 to which the abnormal signal is input is restricted from being energized. Specifically, when the abnormal signal is input, the circuit breaker 14 for wiring is in a trip state, and the energization state is regulated.

Therefore, even if the user performs a predetermined operation, the circuit breaker 14 for wiring does not change to the energized state, and the occurrence of a short-circuit accident can be prevented. When an abnormal signal is output from the phase abnormality detection unit 20, the user checks the state of the wiring, reconnects the wiring correctly, and continues the work.

After the cable 53 is connected, the wiring circuit breaker 14 is turned on. At this time, power is supplied to the distribution board 5 from the uninterruptible power supply 4</b>A via the cable 51 , the cable 52 , the main body 10 and the cable 53 . After the wiring circuit breaker 14 is turned on, it is confirmed using a known ammeter or the like that current is correctly flowing through the cables 52 and 53 . After confirming that the current is correctly flowing through the cables 52 and 53, the connection between the uninterruptible power supply 4A and the distribution board 5 is cut off, and the cable 51 is removed.

After the cable 51 is removed, the switching unit 13 is switched so that the power from the uninterruptible power supply 4B is output to the output unit 16 . When switching unit 13 is switched, power from uninterruptible power supply 4B is supplied to distribution board 5 via cable 54 , main body 10 , and cable 53 . Then, using a known ammeter or the like, it is confirmed that the current is correctly flowing through the cables 53 and 54. After confirming that the current is correctly flowing, the cable 55 is used to connect the branch board 41B. Connect to distribution board 5.

When it is confirmed by using a known ammeter or the like that the current is correctly flowing through the cable 55, the circuit breaker 14 for wiring is brought into a cut-off state and an operation prohibition display is displayed. Subsequently, the circuit breakers 12A and 12B for wiring are put into the cut-off state. Using a known ammeter or the like, it is confirmed that no current is flowing through the cables 52, 53 and 54, respectively, and the power supply to the main body 10 is stopped. Then, the cables 52, 53, 54 are removed to complete the work.

(2) Detailed description of operation confirmation Hereinafter, operation confirmation of the uninterrupted power supply switching device 1 using the test kit 30, which is performed before starting the replacement work, will be described.

First, the connection changing units 27a and 27b are placed in a test state. Specifically, the distribution cables 28a, 28b, 29a, and 29b are removed from the primary sides of the transformers 21 and 22, respectively. Then, the cable 31a is connected to the test voltage input section 25a, and the cable 32a is connected to the voltage input section 26a. Also, the cable 32b is connected to the test voltage input section 25b, and the cable 31b is connected to the voltage input section 26b (see FIG. 4).

Subsequently, the commercial power supply connection section 34 is connected to a 100V commercial power supply, and the 100V commercial power supply is input to the primary sides of the transformers 21 and 22 . In this way, cables 31a and 31b are connected to one phase of the 100V commercial power supply, and cables 32a and 32b are connected to one phase of the 100V commercial power supply. At this time, a voltage opposite in phase to the voltage input to the primary side of the transformer 21 is input to the primary side of the transformer 22 .

When this is done, a voltage opposite in phase to the secondary side of the transformer 21 is output to the secondary side of the transformer 22 . Therefore, a potential difference is generated across the voltage detection section 23 (see FIG. 3B). That is, when the voltage between the voltage output section 44a and the voltage output section 46a is V1, and the voltage between the voltage output section 44b and the voltage output section 46b is -V1, a voltage of 2V1 is applied across the voltage detection section 23. applied.

The voltage detector 23 outputs an abnormal signal when a voltage is applied across it. The user confirms the output of the abnormality signal to confirm that the phase abnormality detector 20 is operating correctly. At this time, the user may confirm that the circuit breaker for wiring 14 is in a state in which the circuit breaker 14 is maintained in the interrupted state, that is, in a trip state.

Since the test kit 30 is provided with the circuit breaker 33, unintended excessive flow through the cables 31 and 32 is prevented during the operation test. Therefore, even if an abnormality such as a short circuit occurs in the phase abnormality detection unit 20 or the like, it is possible to prevent an excessive current from flowing and causing a failure.

After confirming the operation of the phase abnormality detection section 20, the test kit 30 is removed, and the connection change sections 27a and 27b are set to the normal state. Specifically, the cables 31a, 31b and the cables 32a, 32b connected to the test voltage input sections 25a, 25b and the voltage input sections 26a, 26b are removed. Then, the wiring cables 28a, 28b, 29a and 29b are connected to the corresponding portions of the transformers 21 and 22, respectively.

According to the uninterruptible power supply switching device 1, the connection changing units 27a and 27b change the connection state of the wires of the transformers 21 and 22 to the test state, and the commercial power connection unit 34 is simply connected to the 100 V commercial power source. , the operation of the phase abnormality detection unit 20 can be confirmed. Therefore, in order to confirm the operation of the phase abnormality detection unit 20, it is not necessary to prepare a power supply having the same size as the output of the uninterruptible power supply, such as 200 V or 400 V, or a step-up transformer. That is, it is possible to easily check the operation of the main body 10 by using a commercially available 100V commercial power supply.

Further, since the voltage is supplied to the voltage detection section 23 using the transformers 21 and 22 during the operation test, the operation of the phase abnormality detection section 20 including the transformers 21 and 22 can be confirmed. That is, it is possible to confirm the operation of the phase abnormality detection section 20 in a state closer to the state of use.

The test kit 30 also includes a circuit breaker 33 for wiring. For example, even if an abnormality occurs in the phase abnormality detection section 20, overcurrent flows to prevent further failures. In addition, since restoration after removing the cause of the overcurrent can be easily performed, the test can be easily performed again.

In the above-described embodiment, the connection changing units 27a and 27b have been described as applied to an example in which they are configured from known switching taps. 27A and 27B may be provided (see FIG. 5). With such a configuration, it is possible to switch between the use state and the test state by a simple operation of switching the switch units 27A and 27B. Therefore, the non-instantaneous power supply switching device 1 can be configured to allow the operation test to be performed with a simpler operation. Note that the switch units 27A and 27B are examples of changeover switches.

[Second embodiment]
Next, a second embodiment of the present invention will be described mainly with reference to FIG.
The basic configuration of this embodiment is the same as that of the first embodiment, but the test kit used for operation confirmation is different from that of the first embodiment. Therefore, in this embodiment, the test kit will be mainly described with reference to FIG. 6, and the description of other parts will be omitted.

1. Description of Configuration A hitless power switching device 1A of this embodiment includes a main body 10 and a test kit 60 . The test kit 60 is for checking the operation of the voltage detection section 23 of the main body 10 using the commercial power supply 7 of 100V. The test kit 60 mainly includes a transformer 61 , a circuit breaker 62 for wiring, and a cable 63 . Note that the test kit 60 is an example of a test device.

The transformer 61 is a known transformer that converts the voltage of the commercial power supply 7 into a voltage that allows the voltage detection section 23 to operate. In the present embodiment, the transformer 61 is applied to an example of a step-down transformer that converts an AC voltage of 100V to an AC voltage of 12V, and the following description will be given. Note that the transformer 61 is an example of the test transformer.

The circuit breaker 62 for wiring is a known circuit breaker for wiring (MCCB) that prevents an overcurrent exceeding a predetermined magnitude from flowing. Note that the circuit breaker 62 for wiring is an example of a breaker.
The cable 63 is a known cable that connects the commercial power source 7, the transformer 61, the circuit breaker 62 for wiring, and the main body 10, and is composed of cables 64a and 64b, cables 65a and 65b, and cables 66a and 66b.

Cables 64 a and 64 b are a set of cables that connect circuit breaker 62 for wiring and commercial power supply 7 . Cables 65a and 65b are a set of cables that connect the wiring circuit breaker 62 and the primary side of the transformer 61 . Cables 66 a and 66 b are a pair of cables that connect the secondary side of transformer 61 and main body 10 . That is, the cables 66 a and 66 b are cables that apply the voltage output from the secondary side of the transformer 61 to both ends of the voltage detection section 23 .

Connecting portions 67 electrically connected to the commercial power supply 7 are provided at ends of the cables 64a and 64b on the commercial power supply 7 side. Connecting portions 68 electrically connected to both sides of the voltage detecting portion 23 are provided at the ends of the cables 66a and 66b on the main body 10 side. Known connection terminals are used for the connection portions 67 and 68, respectively.

2. Description of Action Next, the action of the uninterrupted power switching device 1A of the present embodiment will be described in line with its usage. Since the uninterruptible power supply switching device 1A of this embodiment is the same as that of the first embodiment in operation before replacement work, the operation check, which is a different part, will be described below.

(1) Description of Operation Confirmation First, the connection portions 68 of the cables 66a and 66b are connected to both sides of the voltage detection portion 23, respectively. In this embodiment, the connection portion 68 of the cable 66a is connected to the connection portion 47a on one side of the voltage detection portion 23, and the connection portion 68 of the cable 66b is connected to the connection portion 47b on the other side of the voltage detection portion 23. The following description is applied to an example of connecting to . The cables 66a and 66b may be connected to other portions as long as they can be electrically connected to both sides of the voltage detection portion 23. FIG.

Subsequently, the connecting portion 67 of the cables 64a and 64b is connected to the commercial power supply 7. FIG. With this configuration, the voltage of the commercial power supply 7 is input to the primary side of the transformer 61 via the cables 64a, 64b, the circuit breaker 62 for wiring, and the cables 65a, 65b. A 100 V commercial power supply input to the primary side of the transformer 61 is stepped down to 12 V and applied to both ends of the voltage detection section 23 .

The user confirms the operation of the voltage detection unit 23 in a state where the voltage is applied to the voltage detection unit 23, and if it is operating properly, replaces the uninterruptible power supply units 4A and 4B, and operates properly. If not, work such as replacing the voltage detector 23 is performed. If a current exceeding a predetermined magnitude flows through the cable 63 due to an abnormality occurring in the voltage detection unit 23, etc., the wiring circuit breaker 62 is placed in a cut-off state, preventing overcurrent from flowing. be

The test kit 60 for the hitless power supply switching device 1A described above includes a transformer 61 that converts the 100V commercial power supply 7 into the operating voltage of the voltage detection section 23 . Therefore, it is possible to easily confirm the operation of the voltage detection unit 23 using the versatile 100V commercial power supply 7 . Moreover, since the test kit 60 has a simple configuration including the transformer 61, the circuit breaker 62 for wiring, and the cable 63, it is easy to handle, and the operation of the main body 10 can be easily confirmed.

The test kit 60 also includes a circuit breaker 62 for wiring. Therefore, it is possible to prevent an excessive current from flowing from the commercial power supply 7 to the main body 10 due to an abnormality in the voltage detecting section 23, for example, or adversely affecting the commercial power supply 7. FIG.

The technical scope of the present invention is not limited to the above embodiments, and various modifications can be made without departing from the scope of the present invention. Moreover, the present invention is not limited to the above-described embodiments as long as it conforms to the gist of the disclosure described in the above-described embodiments. Therefore, in the configuration in which at least two of the above-described embodiments are combined, or in the above-described embodiments, any one of the illustrated constituent elements or the constituent elements described with reference numerals is abolished. It may be a configuration that is

DESCRIPTION OF SYMBOLS 1, 1A... Uninterruptible power supply switching device 2A, 2B... Commercial power supply 3A, 3B... Incoming board 4A, 4B... Uninterruptible power supply 5... Distribution board 6a-6c... Device 10... Main body 11A, 11B... Non-trip switch DESCRIPTION OF SYMBOLS 12A, 12B, 14, 33, 62... Circuit breaker 13... Switching part 15A, 15B... Input part 16... Output part 20... Phase abnormality detection part 21, 22, 61... Transformer 23... Voltage detection part 24a, 24b... Voltage input section 25a, 25b Test voltage input section 26a, 26b Voltage input section 27a, 27b Connection change section 27A, 27B Switch unit (connection change section)
28a, 28b, 29a, 29b... wiring cables,
Reference Signs List 30, 60 Test kit 51, 52, 53, 54, 55, 63 Cable 34 Commercial power connection 41A, 41B Branch board 44a, 44b, 46a, 46b Voltage output 47a, 47b Connection 67, 68 ... connection part

Claims (5)

An uninterrupted power supply switching device used for switching a power supply device that supplies power to a load,
An energized state provided between a power supply side to which the power supply device is connected and a load side to which the load is connected, in which a current flows between the power supply side and the load side; a short-circuit prevention unit that reversibly switches between a cut-off state in which the flow of current between the
a phase abnormality detection unit that detects a phase difference between a power supply side voltage that is the power supply side voltage in the short circuit prevention section and a load side voltage that is the load side voltage in the short circuit prevention section;
a voltage conversion unit that converts the voltage input to the primary side into a desired voltage and outputs the voltage to the phase abnormality detection unit connected to the secondary side;
a connection changing unit that changes a connection state of wiring connected to the voltage conversion unit;
a commercial power connection that is connected to a commercial power source;
with
The connection changing unit changes the connection state of the wiring between a use state in which the phase error detection unit detects the phase difference and a test state in which the operation of the phase error detection unit is checked,
The voltage conversion unit is
in the use state, outputting a voltage corresponding to the difference between the power supply side voltage and the load side voltage input to the primary side;
In the case of the test state, the voltage from the commercial power supply connection unit input to the primary side is converted into a voltage of a predetermined magnitude at which the phase abnormality detection unit operates, and the voltage is output.
Uninterrupted power switching device. 2. The uninterrupted power switching device according to claim 1, further comprising a cutoff section capable of reversibly cutting off current from the commercial power supply, provided between the commercial power connection section and the voltage conversion section. The connection change unit
3. The hitless power supply switching device according to claim 1, further comprising a changeover switch for changing said wiring connected to said primary side of said voltage conversion unit. An energized state provided between a power source side to which a power source device is connected and a load side to which a load to which power is supplied from the power source device is connected, and current flows between the power source side and the load side; a short-circuit prevention unit that reversibly switches between a cut-off state in which current flow between the power supply side and the load side is cut off; A testing apparatus for an uninterrupted power supply switching device, comprising a phase abnormality detection section for detecting a phase difference between a load-side voltage, which is the voltage on the load side, in a short-circuit prevention section, and for switching the power supply device that supplies power to the load. and
a commercial power connection that is connected to a commercial power source;
A testing apparatus for an uninterrupted power supply switching device, comprising a test transformer for converting the voltage of the commercial power supply into a voltage of a magnitude at which the phase abnormality detection section operates. 5. A testing apparatus for a hitless power supply switching device according to claim 4, wherein a breaker capable of reversibly interrupting current from said commercial power supply is provided between said commercial power supply connection part and said test transformer.

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