JP2016012980A - Dc power supply facility - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a DC power supply facility capable of handling emergency state.SOLUTION: The DC power supply facility includes: a first DC power supply facility which has a first storage battery for supplying DC electric power to a load and a first circuit breaker disposed between the first storage battery and the load to supply DC electric power to the load from the first storage battery when a predetermined first condition is satisfied; a second DC power supply facility which has at least one second storage battery for supplying DC electric power to the load; and a switching unit which has a remote controllable second circuit breaker disposed between the second DC power supply facility and the load, which supplies DC electric power from the second storage battery to the load after the first condition has been satisfied and after a predetermined second condition has been satisfied.

Description

  The present invention relates to a DC power supply facility used in an emergency such as loss of AC power supply in a nuclear power plant.

  A DC power supply facility with storage batteries installed in a nuclear power plant is used to supply power to safety-related equipment for maintaining the nuclear power plant in a safe state in an emergency such as loss of AC power. It plays a role as an emergency power source. In Patent Literature 1, among the devices to be supplied with power by a DC power supply facility in the event of a plant emergency such as loss of AC power supply, the operator shuts off the device that does not have an operation request in the plant emergency, so that A method is described in which the power supply time is extended even when the plant emergency state is canceled and the plant does not return to normal.

JP-A-10-111395

  When the emergency state of the plant cannot be resolved at an early stage depending on the degree of emergency, power supply for a longer time than before is required. For this purpose, it is effective to add a storage battery.

  By increasing the number of storage batteries, the installation location of the storage battery becomes necessary, and the short-circuit current at the time of an electric system accident increases, which may increase the effect of the protective relay, the switch, and the like due to the overcurrent. Further, in an emergency situation, it may be difficult for an operator to approach the switch.

  It is an object of the present invention to provide a DC power supply facility suitable for emergency situations.

  The present invention provides a first capacitor for supplying DC power to a load and a first capacitor that is provided between the first capacitor and the load when a first predetermined condition is satisfied. A first DC power supply facility having a first switch for supplying DC power to the load; a second DC power supply facility comprising at least one second capacitor for supplying DC power to the load; Provided between the DC power supply facility and the load, and after the first condition is satisfied and after the predetermined second condition is satisfied, the DC power is supplied from the second capacitor to the load. And a switching device having a second switch that can be remotely operated.

  According to the present invention, power can be supplied for a long time by increasing the number of capacitors. Moreover, this invention can avoid that the overcurrent flows into the switch provided between load and a capacitor | condenser, and the durability of a switch falls. As described above, the present invention can provide a DC power supply suitable for handling an emergency.

  When the second condition is satisfied, it is preferable that the first switch is opened after the second switch is closed. According to this procedure, when switching the capacitor, electric power can be continuously supplied from the capacitor to the load.

  In the switching device, when a plurality of the second capacitors are provided in the second DC power supply facility, each of the second capacitors is provided with a plurality of the second switches and supplies DC power to the load. When the capacity of the second capacitor being reduced falls below a predetermined threshold, the target for supplying the DC power to the load is switched to another second capacitor having a capacity equal to or greater than the predetermined threshold. Closes the second switch provided between the second capacitor having a capacity equal to or greater than a predetermined threshold and the load, and then connects the second capacitor and the load having a capacity less than the predetermined threshold. It is preferable to open the second switch provided between them. According to this procedure, when a plurality of second capacitors are switched, power can be continuously supplied to the load.

  The second switch is preferably opened and closed by a motor from a remote location. In the event of a plant emergency, it may be difficult to access the switch, but if it can be operated remotely, the switching operation can be performed reliably.

  The first switch is preferably opened and closed by a motor from a remote location. In the event of a plant emergency, it may be difficult to access the switch, but if it can be operated remotely, the switching operation can be performed reliably.

  The remote operation can be performed from a plurality of points including a central operation room, and priorities are set for the operation points, and from a separate point after it is determined that the operation from the central operation room is impossible. It is preferable to be able to operate. Although it is assumed that the operation from the central operation room is the main operation, remote operation from the outside may be necessary in the event of a plant emergency. Prioritizing the operation from the outside is problematic, so it is possible to secure driving safety by setting priorities.

  A plurality of the first DC power supply facilities are provided, and a third switch is provided between each of the second capacitors and the load to which each of the first DC power supply facilities supplies DC power. It is preferable that at least one of the loads of the plurality of first DC power supply facilities can be selected by the third switch. When there is a system in the DC load, it is possible to select whether or not to supply power to all or any of them.

  If the emergency state of the plant cannot be resolved early due to the degree of emergency, the short-circuit current at the time of an electrical system accident is constant even if a storage battery is added to supply power that is required for a longer time than before. The load received by the protective relay and the switch due to overcurrent can be kept small, and the operator can safely open and close the switch in an emergency situation. As described above, the present invention can provide a DC power supply suitable for handling an emergency.

FIG. 1 is a schematic diagram illustrating a DC power supply facility according to the first embodiment. FIG. 2 is a flowchart illustrating a connection procedure of the battery according to the first embodiment. FIG. 3 is a schematic diagram illustrating a DC power supply facility according to the second embodiment. FIG. 4 is a flowchart illustrating a connection procedure of the battery according to the second embodiment.

  Embodiments for carrying out the present invention will be described in detail with reference to the drawings. In the following, a nuclear power generation facility is taken as an example of a power plant, but the DC power supply facility corresponding to the emergency according to the present embodiment is not limited to the nuclear power generation facility. The DC power supply facility according to the present embodiment can be applied as a DC power supply facility corresponding to an emergency situation of a thermal power generation facility other than the nuclear power generation facility.

(Embodiment 1)
FIG. 1 is a schematic diagram illustrating a DC power supply facility 100 according to the first embodiment. In order to ensure the safety of the power generation facility until the emergency situation is resolved, when the emergency situation such as a power failure of the power plant occurs and the emergency state continues for a relatively long time, This is equipment for supplying DC power to a load 30 that requires DC power. The load 30 consumes DC power. The relatively long time is, for example, about half a day to two days.

  The DC power supply facility 100 includes a first DC power supply facility 10, a second DC power supply facility 20, and a load 30. The load 30 is, for example, lighting, an auxiliary water supply pump, an oil pump, a solenoid valve, a measurement control device, or the like.

  The first DC power supply facility 10 converts AC power into DC by the converter 11, charges the discharge from the battery 12 as the first battery, waits for power, and simultaneously supplies power to the load 30. The thyristor 13 prevents power from being supplied from the load side to the capacitor side when power is supplied from the capacitor 12 to the load.

  The first DC power supply facility 10 is used as a device that supplies power to the load 30 in an emergency state for a relatively short time. The converter 11 is, for example, a diode, a ripple filter, an IGBT, a vacuum tube, a rotary current transformer, a motor generator, a selenium rectifier, a Seiratron, or a mercury rectifier. The battery 12 is a lead storage battery, a lithium ion battery, a capacitor, or the like. The switch 14 as the first switch is an air circuit breaker, air circuit breaker, wiring circuit breaker, oil circuit breaker, magnetic circuit breaker, gas circuit breaker, vacuum circuit breaker, or the like.

  The second DC power supply facility 20 stands by while converting the AC power into DC by the converter 21 and charging the discharge from the battery 22 as the second battery. The thyristor 23 includes a power supply unit 26 that prevents power from being supplied from the load side to the capacitor side when power is supplied from the capacitor 22 to the load, and a control panel 24 as a switching device.

  The second DC power supply facility 20 is an emergency power supply device for supplying power to the load 30 in an emergency state for a relatively long time. The converter 21 is, for example, a diode, a ripple filter, an IGBT, a vacuum tube, a rotary current transformer, a motor generator, a selenium rectifier, a Seiratron, or a mercury rectifier. The capacitor 22 is a lead storage battery, a lithium ion battery, a capacitor, or the like. The control panel 24 includes a switch 25 as a second switch such as an air circuit breaker, an air circuit breaker, a wiring circuit breaker, an oil circuit breaker, a magnetic circuit breaker, a gas circuit breaker, and a vacuum circuit breaker. The power supply unit 26 includes a converter 21, a capacitor 22, a thyristor 23, and a switch 25, and the connection to the load 30 can be controlled by the control panel 24.

  The switch 25 provided on the control panel 24 of the second DC power supply facility 20 and the switch 14 of the first DC power supply facility 10 are remotely operated manually or automatically from the central operation room 40 and other points 50. Is possible. For example, an electric motor 17 and an electric motor 27 are installed in the switch 14 or the switch 25 to be operated. The electric motor 17 is a power that remotely opens and closes the switch 14, and the electric motor 27 is a power that remotely opens and closes the switch 25. The other point 50 is, for example, in another business facility of the power plant, and is a facility that performs generator control from a remote location. The central operation room 40 is a facility that controls the generator from a remote location, for example, at another point in the power plant.

  The remote operation of the switch 25 and the switch 14 can be performed from a plurality of points including the central operation room 40, and priority is set for the operation points. This remote operation can be performed from a separate point after it is determined that the operation from the central operation room 40 is impossible.

  FIG. 2 is a flowchart illustrating a connection procedure of the battery according to the first embodiment. Step S <b> 101 is a process of supplying power to the load 30 during normal operation of the DC power supply facility 100. During normal operation of the DC power supply facility 100, AC power is converted into DC power by the converter 11 of the first DC power supply facility 10. The converted DC power is supplied to the load 30. At this time, the battery 12 may be charged with the converted DC power.

  Step S102 is processing in which the DC power supply facility 100 detects a power failure of the AC power supply. When the AC power supply fails (step S102, Yes: a predetermined first condition is satisfied), the process proceeds to step S103. If the AC power supply has not failed (Step S102, No: the first condition is not satisfied), the DC power supply equipment 100 repeats Step S101 and Step S102. In the present embodiment, the operator may determine that the AC power supply has been interrupted, or a circuit that automatically supplies power to the load 30 from the capacitor 12 when the AC power supply is lost (power failure). 10 may be installed, and this circuit may determine a power failure of the AC power supply. For example, the operator may determine a power failure of the AC power supply in the central operation room 40 or may remotely determine from another point 50.

  Step S103 is processing for determining an emergency state. In the situation determination, it is determined whether or not the emergency state ends before the capacity of the battery 12 runs out, that is, before it becomes zero. The control device installed in the central operation room 40 or other point 50 may determine the situation in step S103, or the operator may judge the situation. In the present embodiment, if there is a possibility of power recovery before the capacity of the battery 12 falls below a predetermined threshold, it is determined that the emergency state will end before the capacity of the battery 12 runs out, and the capacity of the battery 12 reaches the predetermined capacity. If there is no possibility of power recovery before falling below the threshold, it is determined that the emergency state will end before the battery 12 runs out of capacity.

  For example, when the control device of the central operation room 40 determines that the emergency state does not end before the capacity of the battery 12 is exhausted (step S103, Yes), the process proceeds to step S104. When the control device of the central operation room 40 determines that the emergency state is finished before the capacity of the battery 12 runs out, steps S101 to S103 are repeated.

  Step S104 is a process of determining the switching time of the battery from the capacity of the battery currently in use. In step S104, when the remaining capacity of the battery 12 or 22 currently connected to the load falls below a predetermined threshold value (step S104, Yes: a predetermined second condition is satisfied), the process proceeds to step S105. . When the remaining capacity of the battery 12 or 22 currently connected to the load is equal to or greater than a predetermined threshold (No at Step S104, the second condition is not satisfied), the process returns to Step S104. Here, at least one of current, voltage, temperature, and power supply duration can be used as the predetermined threshold.

  Step S <b> 105 is a step in which the DC power supply facility 100 connects the battery 22 having a sufficient capacity to the load 30. In step S105, the DC power supply facility 100 replaces the capacitor that supplies power to the load 30 when the capacity of the capacitor 12 included in the first DC power supply facility 10 falls below a predetermined threshold. Is switched to the storage battery 22 included. In addition, when the capacitor 22 included in the second DC power supply facility 20 has already supplied power to the load 30, in step S <b> 105, the DC power supply facility 100 replaces the capacitor that supplies power to the load 30 with the second DC power supply. It switches to the other battery 22 with which the power supply equipment 20 is provided.

  If one or more capacitors 22 are connected to the load 30 while the capacitors 12 or 22 are connected to the load 30, an excessive current may flow through the load 30, electrical devices and wiring around the load 30, etc. There is. For this reason, in the present embodiment, the DC power supply facility 100 limits the number of capacitors 22 connected to the load 30 by providing a switch 25 or the like. On the other hand, if the capacity of the connected battery 12 or 22 is lost, a power failure may occur in the load 30. Therefore, in the present embodiment, the DC power supply equipment 100 is configured to connect the capacitor 22 whose capacity remains at a predetermined threshold or more to the load 30 before disconnecting the currently used capacitor from the load 30. By doing in this way, interruption of the power supply when switching the connection target of the load 30 to the battery 22 can be avoided.

  When connecting the capacitor 22 to the load 30, the DC power supply facility 100 is between the capacitor 22 and the load 30 whose remaining capacity does not fall below a predetermined threshold among the switches 25 provided in the switching panel 24. The DC power is supplied to the load 30 by closing and conducting the object. When the DC power supply facility 100 switches the connection target of the load 30 from the capacitor 22 whose capacity is less than the predetermined threshold value to the capacitor 22 whose capacity remains at the predetermined threshold value or more, the process proceeds to step S106.

  Step S <b> 106 is a process of disconnecting the capacitor 12 or the capacitor 22 whose capacity has fallen below a predetermined threshold from the load 30. As described above, in order not to interrupt the power supply to the load 30, the capacitor 22 whose capacity remains at a predetermined threshold or more is connected to the load 30, but the capacitor 12 or the capacitor 22 whose capacity is less than the predetermined threshold is also discharged. doing. The DC power supply equipment 100 is connected to the current load by opening the switch 25 provided in the switch 14 of the first DC power supply equipment 10 or the control panel 24 of the second DC power supply equipment 20. The battery 12 or the battery 22 is disconnected from the load 30.

  Step S107 is processing for determining whether or not to end the capacitor switching process. In step S107, it is confirmed whether or not there is another battery 22 having a remaining capacity equal to or greater than a threshold value. When there is a battery 22 having a remaining capacity equal to or greater than the threshold (No at Step S107), Steps S104 to S107 are repeated. When there is no capacitor 22 with a remaining capacity equal to or greater than the threshold value other than that currently connected to the load 30 (step S107, Yes), the DC power supply equipment 100 ends the switching of the capacitor 22.

  The determination in step S107 may be performed from the central operation room 40 or may be performed from another point 50. The remaining capacity of the battery may be determined by, for example, a control device installed in the central operation room 40 or may be determined by an operator.

  In the present embodiment, the DC power supply facility 100 is operated up to the place where the control panel 24 is installed by operating the electric motor 17 of the switch 14 and the electric motor 27 of the switch 25 from the central operation room 40 or the like. Even when the access route cannot be secured, the battery 22 can be inserted. Further, since the DC power supply facility 100 can be used by sequentially switching between the capacitors 12 and 22, the number or capacity of the capacitors 22 can be increased in a state where the short-circuit current is suppressed to be equal to or less than the allowable current of the existing facilities.

(Embodiment 2)
FIG. 3 is a schematic diagram illustrating a DC power supply facility 100a according to the second embodiment. At least one of the loads 30, 30a needs to be supplied with DC power during a relatively long emergency. This emergency will not be resolved in a short time during a power plant blackout. In this case, it does not resolve in a short time means that it takes about half a day to about two days.

  DC power supply facility 100a includes a load 30 and a load 30a that exist independently as separate circuits. The load 30 is provided with a first power supply facility 10 for supplying normal power, and the load 30a is provided with a first power supply facility 10a for supplying normal power. The load 30 and the load 30a are, for example, lighting, an auxiliary water supply pump, an oil pump, a solenoid valve, or a measurement control device.

  The first DC power supply facilities 10 and 10a include a converter 11 or a converter 11a that converts power supplied to the loads 30 and 30a from AC to DC, and a capacitor 12 as a first capacitor for overcoming a relatively short blackout. The capacitor 12a, the thyristor 13 or the thyristor 13a that prevents backflow from the load 30 and the load 30a to the capacitor 12 or the capacitor 22 when power is supplied, the first DC power supply facility 10 and the first DC power supply facility 10a and the load 30 1st switch 14 or switch 14a which connects load 30a.

  The first DC power supply facility 10 and the first DC power supply facility 10a are commonly used as devices for supplying power to the load 30 or the load 30a in an emergency state for a relatively short time. The converters 11 and 11a are, for example, a diode, a ripple filter, an IGBT, a vacuum tube, a rotary current transformer, a motor generator, a selenium rectifier, a Seiratron, or a mercury rectifier. The capacitors 12 and 12a are lead storage batteries, lithium ion batteries, capacitors, or the like. The switches 14 and 14a are air circuit breakers, air circuit breakers, wiring circuit breakers, oil circuit breakers, magnetic circuit breakers, gas circuit breakers, or vacuum circuit breakers.

  The second DC power supply facility 20a selects the power supply units 26 and 26a and at least one of the loads 30 and 30a, and a control panel 24a as a switching device for controlling which power supply unit 26 or 26a is selected, including. Each of the power supply units 26 and 26a includes a converter 21 that converts AC power into DC, a capacitor 22 as a second capacitor that stores electricity during normal time, and a thyristor 23 that prevents backflow when connected to the loads 30 and 30a. including. The second DC power supply facility 20a is an emergency power supply device for supplying power to at least one of the load 30 and the load 30a in an emergency state for a relatively long time.

  The converter 21 is, for example, a diode, a ripple filter, an IGBT, a vacuum tube, a rotary current transformer, a motor generator, a selenium rectifier, a Seiratron, or a mercury rectifier. The capacitor 22 is a lead storage battery, a lithium ion battery, a capacitor, or the like. The control panel 24 includes switches 25 and 25a such as an air circuit breaker, an air circuit breaker, a wiring circuit breaker, an oil circuit breaker, a magnetic circuit breaker, a gas circuit breaker, and a vacuum circuit breaker as a second switch.

  Here, switching of connection to at least one of the load 30 and the load 30a is performed by the switch 31 or the switch 31a as a third switch provided in the control panel 24a. The switch 31 is provided between the power supply unit 26 and the load 30, and the switch 31a is provided between the power supply unit 26a and the load 30a. These switches 31 and 31 a can be operated manually or automatically from the central operation room 40 and other points 50. For example, an electric motor 28 and an electric motor 28a are attached to the operated switch 31 and the switch 31a, respectively. The electric motor 28 is power for remotely opening and closing the switch 31, and the electric motor 28 a is power for remotely opening and closing the switch 31 a.

  The switches 14, 14 a of the first DC power supply facilities 10, 10 a and the switch 25 provided on the control panel 24 a of the second DC power supply facility 20 a are manually operated from the central operation room 40 and other points 50. It can be remotely operated automatically. This remote operation can be performed from a plurality of points including the central operation room 40, and priorities are set for the operation points, and it is determined that the operation from the central operation room 40 is impossible. It becomes possible to operate from.

  FIG. 4 is a flowchart illustrating a connection procedure of the battery according to the second embodiment. Step S201 is a process of feeding power to the loads 30 and 30a during normal operation of the DC power supply facility 100a. AC power is converted into DC using the converter 11 and the converter 11a. The converted DC power is supplied to the loads 30 and 30a. At this time, the converted DC power may be used for purposes such as charging the battery 12 and the battery 12a.

  Step S202 is processing for determining a power failure of the AC power supply. When the AC power supply fails (step S202, Yes: the first condition is satisfied), the DC power supply facility 100a performs the process of step S203. When the AC power supply is not out of power (step S202, No: the first condition is not established), the DC power supply facility 100a repeats step S201 and step S202. In the present embodiment, the operator may determine whether or not the AC power supply is interrupted, and when the AC power supply is lost (power failure), the circuit that is automatically fed from the capacitor 12 to the loads 30 and 30a is the first direct current. It may be installed in the power supply facility 10 and this circuit may determine the AC power failure. If a power failure has occurred, the DC power supply facility 100a performs the process of step S203.

  Step 203 is processing for determining an emergency state. The contents of the situation determination are the same as in the first embodiment. For example, when the control device of the central operation room 40 determines that the emergency state does not end before the capacity of the battery 12 or the battery 12a is exhausted (step S203, Yes), the process proceeds to step S204. When the control device or the operator of the central operation room 40 determines that the emergency state is finished before the capacity of the battery 12 or the battery 12a runs out, steps S201 to S203 are repeated.

  Step S204 is processing for selecting which of the load 30 and the load 30a needs to be supplied with DC power. When only the load 30 needs to be fed, in step S205, the DC power supply equipment 100a supplies power to the load 30 by closing the switch 31 and opening the switch 31a.

  When power supply is necessary for both the load 30 and the load 30a, in step S206, the DC power supply facility 100a supplies power to the load 30 and the load 30a by closing both the switch 31 and the switch 31a. When power supply is necessary only for the load 30a, the DC power supply equipment 100a supplies power to the load 30a by closing the switch 31a and opening the switch 31 in step S207.

  Here, the switch 31 and the switch 31a may be opened / closed on the DC power supply equipment 100a side, or may be opened / closed by a control device installed in the central operation room 40 or other points 50. In addition, the switch 31 and the switch 31a may be opened and closed by the operator in the central operation room 40 or other points 50.

  Step S208 is processing for determining the replacement time of the battery from the capacity of the battery currently in use. When the remaining capacity of the capacitors 12 and 12a or the capacitors 22 currently connected to the load falls below a predetermined threshold (step S208, Yes: the second condition is satisfied), the DC power supply equipment 100a performs the process of step 209. If the remaining capacity of the capacitors 12, 12a or capacitors 22 currently connected to the load is equal to or greater than a predetermined threshold (step S208, No: the second condition is not satisfied), the DC power supply facility 100a returns to step S208. Here, at least one of current, voltage, temperature, and power supply duration can be used as the predetermined threshold.

  Step 209 is a step in which the DC power supply facility 100a connects the capacitor 22 having a sufficient capacity to at least one of the load 30 and the load 30a. When one or a plurality of capacitors 22 are connected to the load 30 or the like with the capacitors 12, 12a or the capacitor 22 connected to at least one of the load 30 and the load 30a, the electrical devices and wiring around the load 30 and the like, etc. For example, an excessive current may flow. For this reason, in the present embodiment, the DC power supply facility 100 a is provided with a switch 25 or the like to limit the number of capacitors 22 connected to the load 30.

  On the other hand, if the capacity of the connected capacitors 12, 12a or the capacitor 22 is lost, a power failure may occur in the loads 30, 30a. Therefore, in the present embodiment, the DC power supply facility 100a is configured to connect the capacitor 22 whose capacity remains at a predetermined threshold or more to the loads 30 and 30a before disconnecting the currently used capacitor from the loads 30 and 30a. Yes. By doing in this way, the interruption of the electric power supply at the time of switching the connection object of load 30, 30a to the battery 22 can be avoided.

  In connecting the capacitor 22 to the loads 30 and 30a, the DC power source equipment 100a includes the capacitor 22 and the loads 30 and 30a whose remaining capacity does not fall below a predetermined threshold among the switches 25 provided in the switching panel 24a. DC power is supplied to the loads 30 and 30a by closing and connecting the ones between them. When the DC power supply facility 100a switches the connection target of the loads 30 and 30a from the capacitor 22 with the capacity less than the predetermined threshold value to the capacitor 22 with the capacity remaining at the predetermined threshold value or more, the process proceeds to step S210.

  Step S210 is a process of disconnecting the capacitors 12, 12a or the capacitors 22 whose capacities are below a predetermined threshold from the loads 30, 30a. As described above, in order not to interrupt the power supply to the loads 30 and 30a, the capacitor 22 whose capacity remains more than a predetermined threshold is connected to the loads 30 and 30a, but the capacitor 12 whose capacity is less than the predetermined threshold, 12a or the capacitor 22 is also discharged. The DC power supply facility 100a is loaded with the current load by opening the switch 14 or the switch 14a of the first DC power supply facility 10 or the switch 25 provided in the control panel 24 of the second DC power supply facility 20. The connected capacitors 12, 12a or capacitors 22 are disconnected from the loads 30, 30a.

  Step S211 is a process of determining whether or not to end the capacitor switching process. In step S211, it is confirmed whether or not there is another battery 22 having a remaining capacity equal to or greater than a threshold value. When there is a battery 22 having a remaining capacity equal to or greater than the threshold (No at Step S211,), Step S208 to Step S211 are repeated. When there is no capacitor 22 having a remaining capacity equal to or greater than the threshold value other than that currently connected to the loads 30 and 30a (step S211, Yes), the DC power supply facility 100a finishes switching the capacitor 22.

  The determination in step S211 may be performed from the central operation room 40 or may be performed from another point 50. The remaining capacity of the battery may be determined by, for example, a control device installed in the central operation room 40 or may be determined by an operator.

  In the present embodiment, the DC power supply equipment 100a supplies power to a plurality of loads. However, as in the first embodiment, even when the access route to the place where the control panel 24 is installed cannot be secured, the capacitor 22 can be input. Further, since the DC power supply facility 100a can be used by sequentially switching the capacitors 12, 12a, and the capacitor 22, the number or capacity of the capacitors 22 can be increased in a state where the short-circuit current is suppressed to be equal to or less than the allowable current of the existing facilities. .

  Although the present embodiment and its modification have been described above, the present embodiment and its modification are not limited by the above-described content. In addition, constituent elements of the above-described embodiment and modifications thereof include those that can be easily assumed by those skilled in the art, those that are substantially the same, and those in a so-called equivalent range. Furthermore, the above-described components can be appropriately combined. In addition, various omissions, substitutions, and changes of the constituent elements can be made without departing from the scope of the present embodiment and its modifications.

10, 10a First DC power supply facility 11, 11a Converter 12, 12a Capacitor 13, 13a Thyristor 14, 14a Switch 17 Electric motor 20, 20a Second DC power supply facility 21 Converter 22 Capacitor 23 Thyristor 24, 24a Control panel 25 Open / close 26, 26a Power supply unit 27, 28, 28a Electric motor 30, 30a Load 31, 31a Switch 40 Central operation room 50 Point 100, 100a DC power supply equipment

Claims (7)

A first capacitor for supplying DC power to a load, and provided between the first capacitor and the load, and when a first predetermined condition is satisfied, the first capacitor is connected to the load. A first DC power supply facility having a first switch for supplying power;
A second DC power supply facility comprising at least one second battery for supplying DC power to the load;
Provided between the second DC power supply facility and the load, after the first condition is satisfied and after a predetermined second condition is satisfied, from the second capacitor to the load A switching device having a second switch that can be operated remotely, supplying DC power;
Including DC power supply equipment. When the second condition is satisfied,
The DC power supply facility according to claim 1, wherein the first switch is opened after the second switch is closed. The switching device is
In the case where a plurality of the second capacitors are provided in the second DC power supply facility, a plurality of the second switches are provided in each of the second capacitors, and a second power is supplied to the load. When the capacity of the storage battery falls below a predetermined threshold, the target for supplying the DC power to the load is switched to another second storage battery whose capacity is equal to or greater than the predetermined threshold.
In this switching operation, after closing the second switch provided between the second capacitor having a capacity equal to or greater than a predetermined threshold and the load, the second capacitor having a capacity less than the predetermined threshold The DC power supply facility according to claim 1 or 2, wherein the second switch provided between the load and the load is opened.   The DC power supply facility according to any one of claims 1 to 3, wherein the second switch is opened and closed by a motor from a remote location.   The DC power supply facility according to any one of claims 1 to 4, wherein the first switch is opened and closed by an electric motor from a remote location.   The remote operation can be performed from a plurality of points including a central operation room, and priorities are set for the operation points, and from a separate point after it is determined that the operation from the central operation room is impossible. The DC power supply facility according to any one of claims 1 to 5, which can be operated. A plurality of the first DC power supply facilities are provided, and a third switch is provided between each of the second capacitors and the load to which each of the first DC power supply facilities supplies DC power. ,
The DC power supply facility according to any one of claims 1 to 6, wherein at least one of a plurality of loads of the first DC power supply facility can be selected by the third switch.

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