JP2021136796A - Power supply facility - Google Patents

Abstract

To provide a power supply facility which can suppress both the unintended halt of a fixed load and cost increase.SOLUTION: The power supply facility includes: a power supply; facility equipment to which power is fed from the power supply; and a connector for a fixed load and a connector for a fluctuating load which are electrically connected to the facility equipment. The facility equipment includes: a main breaker a first electric path on which the main breaker is provided and to which the power supply and the connector for fixed load is connected; a second electric path to which the power supply and the connector for fluctuating load are connected without the intermediary of the main breaker; and a switch which is provided on the second electric path. The opening and closing of the switch is controlled in cooperation with the opening and closing of the main breaker.SELECTED DRAWING: Figure 1

Description

The present invention relates to power supply equipment.

A service breaker contract covering a predetermined breaker capacity may be concluded between a business operator such as a factory and an electric power company. In this case, the business operator can easily add mass-produced machinery and equipment in the factory and the like as long as the capacity is within the capacity specified in the contract. Patent Document 1 below discloses an overload prevention device that notifies an alarm before the current consumption flowing from the main breaker to the load device reaches the maximum load current value. In this overload prevention device, when the time counting by the timer control unit reaches a predetermined time, the notification unit performs notification. By adding such an overload prevention device to the power supply equipment, it is possible to prevent unexpected interruption by the main breaker.

Japanese Unexamined Patent Publication No. 2001-333525

The power supply equipment provided with the above-mentioned overload prevention device is useful, for example, when all the mass-produced mechanical equipment including the additional mechanical equipment can be regarded as a load (fixed load) within a predetermined range. However, for example, the type, load, and the like of the electronic device used in a role different from that of the mass production machine / equipment may not be determined in advance (that is, it is a variable load). When an unexpected excess current suddenly flows through such a fluctuating load, the overload prevention device does not operate, and in addition to the breaker of the electronic device, the main breaker of the power supply facility connected in series with the electronic device. May block. In this case, there is a problem that all the machinery and equipment are unintentionally stopped.

As a countermeasure for the above problem, for example, it is conceivable to provide a power supply facility for a fixed load and a power supply facility for a variable load. In this case, it becomes a factor of increasing the cost of equipment and the like, which is not desirable.

An object of one aspect of the present invention is to provide a power supply facility capable of suppressing both an unintended stop of a fixed load and an increase in cost.

The power supply equipment according to one aspect of the present invention includes a power source, equipment supplied from the power source, and a fixed load connector and a variable load connector electrically connected to the equipment. Is provided with a main breaker, a first electric path for connecting a power supply and a fixed load connector, and a second electric path for connecting a power supply and a variable load connector without going through the main breaker. , A switch provided in the second electric path, and the opening and closing of the switch is controlled in conjunction with the opening and closing of the main breaker.

In this power supply equipment, the power supply and the fixed load connector are connected by the first electric path via the main breaker, and the power supply and the variable load connector are connected to the second electric path not via the main breaker. Is connected. As a result, for example, when an unexpected excess current suddenly flows through the variable load connected to the variable load connector, the breaker in the variable load is simply cut off, so that the main breaker is not cut off. Therefore, even when the power supply from the power supply to the variable load is cut off, the power supply from the power supply to the fixed load connector can be maintained. In addition, in the power supply equipment, the opening and closing of the switch is controlled in conjunction with the opening and closing of the main breaker. For example, by opening the main breaker to cut off the power supply from the power source to the fixed load connector, the switch in the second electric path is opened. Therefore, both the power supply from the power supply to the fixed load connector and the power supply to the variable load connector can be controlled in conjunction with the control of the main breaker. Therefore, by using the power supply equipment according to one aspect of the present invention, it is possible to suppress both an unintended stop of a fixed load and an increase in cost.

Equipment has a secondary side of the main breaker in the first electrical path and a signal line connecting the switch, which closes when the power supply supplies power to the signal line and the power supply to the signal line. It may be opened when the power is not supplied to. In this case, the opening and closing of the switch can be easily controlled.

The switch may be a magnet switch. In this case, the variable load connected to the variable load connector can be satisfactorily protected.

A sub-breaker may be provided between the switch and the variable load connector in the second electrical path. In this case, the power supply and the switch can be well protected.

The fixed load connector may be connected to a mass production machine / equipment having a fixed load in a factory. In this case, even when an unexpected excess current flows through the variable load connected to the variable load connector, the power supply from the power source to the mass production machinery and equipment can be maintained. Therefore, mass production at the factory can be continued even when the power supply from the power source to the variable load is stopped.

According to one aspect of the present invention, it is possible to provide a power supply facility capable of suppressing both an unintended stop of a fixed load and an increase in cost.

FIG. 1 is a block diagram showing a main part of the power supply equipment according to the embodiment. FIG. 2 is an electronic circuit diagram mainly showing a main breaker of equipment. FIG. 3 is a block diagram showing a main part of the power supply equipment according to the comparative example.

Hereinafter, embodiments according to one aspect of the present invention will be described in detail with reference to the drawings. In the description of the drawings, the same reference numerals are used for the same or equivalent elements, and duplicate description is omitted.

FIG. 1 is a block diagram showing a main part of the power supply equipment according to the present embodiment. As shown in FIG. 1, the power supply equipment 1 includes a power supply 2, equipment 3, a fixed load connector 4, and a variable load connector 5. The power supply equipment 1 is equipment installed in a business establishment such as a factory or a research institute, and uses a three-phase AC commercial power supply distributed from a transmission line. The power supply equipment 1 may appropriately use not only a commercial power source but also a power source such as a generator and a storage battery.

The power supply 2 is a part to which power is supplied in the power supply equipment 1, and is, for example, a part of a switchboard. The power supply 2 has a power supply circuit that generates the required output power from the power input to the power supply equipment 1. The power supply 2, for example, appropriately converts the input voltage, frequency, etc., and supplies the power supply 2 to the secondary side.

The equipment device 3 is a device used for equipment protection or the like in a business establishment, and is supplied with power from a power source 2. The equipment 3 is, for example, another part of the switchboard. In the present embodiment, the equipment 3 is supplied with power from the power source 2 via at least two electric paths. The details of the configuration of the equipment 3 will be described later.

The fixed load connector 4 is a wiring plug connector (outlet, connector) to which equipment that becomes a fixed load in a business establishment is connected, and is electrically connected to the equipment 3. The fixed load connector 4 is supplied with power from the power source 2 via the equipment 3. The fixed load connector 4 functions as a power source for the fixed load. The fixed load is an electronic device having a defined range of power consumption, and is, for example, a mass production machine / equipment, a lighting device, an air conditioner, or the like provided in a business establishment. Therefore, the power consumed by the fixed load does not have to be constant. In FIG. 1, one fixed load connector 4 is provided for the equipment 3, but the present invention is not limited to this. For example, a plurality of fixed load connectors 4 may be provided for the equipment 3, or a plurality of fixed loads may be connected to one fixed load connector 4. Further, the fixed load is not connected to the fixed load connector 4, and the fixed load may be blank.

The variable load connector 5 is a wiring plug connector (outlet, connector) to which equipment that becomes a variable load in a business establishment is connected, and is electrically connected to the equipment 3. The variable load connector 5 is supplied with power from the power source 2 via the equipment 3. The variable load connector 5 functions as a power source for the variable load. The fluctuating load is an electronic device whose power consumption range can suddenly fluctuate, and is, for example, an experimental machine / equipment, a mass production test machine / equipment, etc. provided in a business establishment. Electronic devices whose power consumption range can fluctuate are, for example, devices in which an unexpected excess current is more likely to flow than a fixed load. In FIG. 1, one variable load connector 5 is provided for the equipment 3, but the present invention is not limited to this. Further, the variable load connector 5 may not be connected to the variable load and may be blank. A fixed load may be temporarily connected to the variable load connector 5. That is, in the present embodiment, the variable load connector 5 can be used as a spare wiring plug-in connector at the business establishment, and when the variable load is used at the business establishment, the variable load connector 5 can be used. Connected only to.

Next, the configuration of the equipment 3 will be described in detail. The equipment 3 includes a main breaker 11, a first electric path L1 in which the main breaker 11 is provided, a second electric path L2 different from the first electric path L1, and a signal line L3 connected to the first electric path L1. And a switch 12 provided in the second electric path L2.

FIG. 2 is an electronic circuit diagram mainly showing a main breaker of equipment. The main breaker 11 is a main switch in the equipment 3, and has a breaker 21 and a switch 22. The breaker 21 is, for example, an overcurrent circuit breaker for protecting equipment, electric wires, and the like in a business establishment. The breaker 21 opens the first electric path L1 when, for example, an overcurrent flows through the fixed load connector 4, a breaker (not shown) in the fixed load is cut off, or an electric leakage occurs. The switch 22 is a switch that opens and closes the first electric path L1, and is automatically turned on when power is supplied from the power source 2 to the first electric path L1. Further, when the power supply from the power supply 2 to the first electric path L1 is stopped, the switch 22 is automatically turned off. In this embodiment, the switch 22 is located on the secondary side of the breaker 21, but is not limited to this. In the present embodiment, the state in which the switch is turned on corresponds to the state in which the switch is closed, and the state in which the switch is turned off corresponds to the state in which the switch is open. When the switch 22 is closed, it corresponds to a state in which the main breaker 11 is closed, and power is supplied from the power supply 2 to the fixed load connector 4. On the other hand, when the switch 22 is opened, it corresponds to a state in which the main breaker 11 is open, and the power supply from the power supply 2 to the fixed load connector 4 is stopped.

The first electric path L1 is a wiring that connects the power supply 2 and the fixed load connector 4, and is provided with a main breaker 11. In the first electric path L1, the breaker 21 of the main breaker 11 and the switch 22 are connected in series.

The second electric path L2 is a wiring for connecting the power supply 2 and the variable load connector 5, and the main breaker 11 is not provided. Therefore, the second electric path L2 connects the power supply 2 and the variable load connector 5 without going through the main breaker 11. When three power cables for three-phase alternating current are arranged from the power source 2, the first electric path L1 and the second electric path L2 are wirings based on different power cables, but are limited to this. No.

The signal line L3 is a wiring that branches from the first electric path L1 on the secondary side of the main breaker 11, and connects the secondary side of the main breaker 11 in the first electric path L1 and the switch 12. At the tip of the signal line L3, an operation unit 23 for operating the opening / closing of the switch 12 is provided. The operation of the operation unit 23 is controlled by a signal input from the signal line L3. The secondary side of the main breaker 11 in the first electric path L1 corresponds to the space between the main breaker 11 in the first electric path L1 and the fixed load connector 4.

The switch 12 is a switch that opens and closes the second electric path L2. The opening and closing of the switch 12 is operated by the operation unit 23. That is, the opening and closing of the switch 12 is controlled by the signal input from the signal line L3. For example, the switch 12 is turned on when a signal is input to the signal line L3, and the switch 12 is turned off when no signal is input to the signal line L3. The type of switch 12 is not particularly limited.

In the present embodiment, a magnet switch is used as the switch 12 from the viewpoint of fluctuating load, protection of the second electric path L2, and the like. In this case, the operation unit 23 connected to the signal line L3 is a coil, and the signal input to the signal line L3 is the current itself flowing from the first electric path L1. Therefore, when the signal line L3 is supplied from the power source 2 (that is, when the operation unit 23 is supplied with power), the switch 12 is closed, and when the signal line L3 is not supplied from the power source 2 (that is, the operation). The switch 12 is opened when the power supply to the unit 23 is stopped). As described above, the signal line L3 is located on the secondary side of the main breaker 11. Therefore, when power is supplied from the power source 2 to the fixed load connector 4 via the first electric path L1, power is also supplied to the signal line L3, and as a result, the switch 12 is closed. On the other hand, when at least one of the breaker 21 and the switch 22 is open, that is, when the power supply from the power supply 2 to the fixed load connector 4 is stopped, the power supply to the signal line L3 is also stopped. As a result, the switch 12 is opened. Therefore, the opening and closing of the switch 12 is controlled in conjunction with the opening and closing of the main breaker 11.

The operation and effect of the power supply equipment 1 according to the present embodiment described above will be described with reference to the power supply equipment according to the comparative example described below. FIG. 3 is a block diagram showing a main part of the power supply equipment according to the comparative example. As shown in FIG. 3, the power supply equipment 100 according to the comparative example is different from the power supply equipment 1 of the present embodiment in that the equipment equipment 103 does not have the second electric path L2. Therefore, in the power supply equipment 100, the fixed load connector 4 and the variable load connector 5 are connected in series to the main breaker 11. Here, when an unexpected excess current suddenly flows through the variable load connected to the variable load connector 5, not only the breaker included in the variable load but also the main breaker 11 is cut off. As a result, not only the variable load but also the fixed load connected to the fixed load connector 4 is unintentionally stopped. For example, when the power supply equipment 100 is used in a factory for mass production, there is a problem that the machine equipment for mass production, which is a fixed load, is unintentionally stopped.

As a countermeasure for the above problem, for example, it is conceivable to provide a power supply facility for a fixed load and a power supply facility for a variable load. In this case, it becomes a factor of increasing the cost of equipment and the like, which is not desirable. In addition, during maintenance of the office, it is necessary to stop both the power supply equipment for fixed load and the power supply equipment for variable load, but due to oversight etc., only the power supply equipment for fixed load is dropped. There is a possibility that it will end up. In this case, the power supply equipment for variable load may be unintentionally destroyed, and there is a risk of electric leakage from the power supply equipment.

Alternatively, it is conceivable to increase the trip value of the main breaker 11 included in the power supply equipment 100 (that is, increase the contracted capacity). In this case, not only the contract fee is increased, but also the device configuration may be complicated and the device configuration may be improved in performance, which causes an increase in cost. In addition, increasing the trip value of the main breaker 11 leads to an increase in the size of the main breaker 11. In this case, a new main breaker cannot be placed in the place where the conventional main breaker is placed, and a major repair of the power supply equipment is required. Therefore, it becomes a factor of further cost increase. Furthermore, if the trip value is simply increased, the main breaker 11 may not function even if an abnormality occurs in a fixed load or the like in normal use.

On the other hand, in the power supply equipment 1 according to the present embodiment, the power supply 2 and the fixed load connector 4 are connected by the first electric path L1 provided with the main breaker 11, and the power supply 2 and the variable load connector 4 are connected. 5 is connected by a second electric path L2 that does not go through the main breaker 11. As a result, for example, when an unexpected excess current flows through the variable load connected to the variable load connector 5, the breaker in the variable load simply shuts off, so that the main breaker 11 does not cut off. Therefore, even when the power supply from the power supply 2 to the variable load is cut off, the power supply from the power supply 2 to the fixed load connector 4 can be maintained. In addition, in the power supply equipment 1, the opening and closing of the switch 12 is controlled in conjunction with the opening and closing of the main breaker 11. Therefore, both the power supply from the power supply 2 to the fixed load connector 4 and the power supply to the variable load connector 5 can be controlled in conjunction with the control of the main breaker 11. Therefore, by using the power supply equipment 1, it is possible to suppress both unintentional stoppage of the fixed load and cost increase.

In the present embodiment, the equipment 3 further includes a secondary side of the main breaker 11 in the first electric path L1 and a signal line L3 connecting the switch 12, and the switch 12 has a signal line L3 from the power supply 2. It may be closed when power is being supplied to the signal line L3 and may be opened when power is not supplied from the power supply 2 to the signal line L3. In this case, the opening and closing of the switch 12 can be easily controlled.

In this embodiment, the switch 12 may be a magnet switch. In this case, the variable load connected to the variable load connector 5 can be satisfactorily protected.

In the present embodiment, the fixed load connector 4 may be connected to a mass production machine / equipment having a fixed load in a factory. In this case, even when an unexpected excess current flows through the variable load connected to the variable load connector 5, the power supply from the power supply 2 to the mass production machinery and equipment can be maintained. Therefore, mass production at the factory can be continued even when the power supply from the power supply 2 to the variable load is stopped.

The above embodiments have described one aspect of the present invention. Therefore, the present invention can be appropriately modified without being limited to the above embodiment. For example, in the above embodiment, the switch 12 is controlled by a signal input from the signal line L3, but the switch 12 is not limited to this. For example, it may be controlled by a radio signal of a radio connected to the fixed load connector 4. In this case, since the signal line L3 does not have to be provided, the configuration of the equipment 3 can be simplified.

For example, in the second electric path L2 of the above embodiment, a sub-breaker may be provided between the switch 12 and the variable load connector 5. In this case, the power supply 2 and the switch 12 can be satisfactorily protected.

In the above embodiment, the power supply 2 and the equipment 3 are included in the switchboard, but the present invention is not limited to this. The equipment 3 may be different from the power supply 2. In addition to the power supply 2 and the equipment 3, the switchboard may include, for example, a transformer, voltage monitoring equipment, a circuit breaker, and the like.

1 ... Power supply equipment, 2 ... Power supply, 3 ... Equipment equipment, 4 ... Fixed load connector, 5 ... Variable load connector, 11 ... Main breaker, 12 ... Switch, 21 ... Breaker, 22 ... Switch, 23 ... Operation Unit, L1 ... 1st electric path, L2 ... 2nd electric path, L3 ... signal line.

Claims (5)

Power supply and
Equipment supplied from the power source and equipment
A fixed load connector and a variable load connector that are electrically connected to the equipment.
With
The equipment is
With the main breaker
The main breaker is provided, and the first electric path for connecting the power supply and the fixed load connector is provided.
A second electric path for connecting the power supply and the variable load connector without going through the main breaker, and
It has a switch provided in the second electric path and
The opening and closing of the switch is controlled in conjunction with the opening and closing of the main breaker.
Power supply equipment. The equipment further includes a secondary side of the main breaker in the first electrical path and a signal line connecting the switch.
The power supply equipment according to claim 1, wherein the switch is closed when power is supplied from the power source to the signal line, and is opened when power is not supplied from the power source to the signal line. The power supply equipment according to claim 1 or 2, wherein the switch is a magnet switch. The power supply equipment according to any one of claims 1 to 3, wherein a sub-breaker is provided between the switch and the variable load connector in the second electric path. The power supply equipment according to any one of claims 1 to 4, wherein the fixed load connector is connected to a mass production machine equipment having a fixed load in a factory.

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