System

Abstract

A system (1) comprises: a control device (10) that controls a current to a power cable; a detection device (20) that detects a temperature inside a pipeline accommodating the power cable; a first facility (30) that supplies power to an external supply destination via the power cable; and a second facility (40) that can supply power to the external supply destination not via the power cable. The detection device (20) outputs temperature information indicating a temperature to the control device (10). When determining that the temperature is equal to or higher than a predetermined temperature on the basis of the temperature information, the control device (10) reduces the current and switches at least a part of the power supply to the external supply destination from the supply from the first facility (30) to the supply from the second facility (40).

Description

system

[0001] The present disclosure relates to a system.

[0002] As a method for utilizing existing stocks of communication equipment, efforts are being considered to reduce the cost of laying power cables by laying power cables in communication conduits where no communication cables are installed. Typically, when laying power cables, dedicated power conduits are used. Dedicated power conduits are made of materials that can withstand heat of, for example, 80°C or higher, so that the physical properties of the conduit do not deteriorate even when the power cable generates heat, and they can be used without limiting the amount of power. For example, Non-Patent Document 1 discloses information on heat resistance as a wire standard for dedicated power conduits.

[0003] PVC Pipe and Fittings Association, "PVC Pipe and Fittings Association Standards for Electric Utility Tunnel Power Pipe Materials," p. 1, 2022

[0004] When a conduit for communication cables used in place of a dedicated conduit for power cables is made of polyvinyl chloride pipe or the like, there is a possibility that the heat generated by the power cables will cause deterioration in physical properties or deformation.

[0005] The present disclosure has been made in view of the above circumstances, and aims to suppress an increase in the temperature of a conduit due to heat generation in a power cable.

[0006] A system according to one embodiment includes a control device that controls the current to a power cable, a detection device that detects the temperature inside a conduit that houses the power cable, a first facility that supplies power to an external destination via the power cable, and a second facility that can supply power to the external destination without via the power cable, wherein the detection device outputs temperature information indicating the temperature to the control device, and when the control device determines based on the temperature information that the temperature is equal to or higher than a predetermined temperature, the control device reduces the current and switches at least a portion of the power supply to the external destination from the supply from the first facility to the supply from the second facility.

[0007] According to the present disclosure, it is possible to suppress an increase in the temperature of the conduit due to heat generation in the power cable.

[0008] It is a diagram for explaining the configuration of the system. It is a block diagram showing the configuration of the detection device. It is a block diagram showing the configuration of the second equipment. It is a flowchart showing an operation example of the system. It is a flowchart showing an operation example of the system.

[0009] Hereinafter, an embodiment of the present disclosure will be described with reference to the drawings.

[0010] In each drawing, the same or corresponding parts are denoted by the same reference numerals. In the description of this embodiment, the description of the same or corresponding parts will be omitted or simplified as appropriate.

[0011] The configuration of a system 1 according to this embodiment will be described with reference to FIG. 1. The system 1 includes a control device 10, a detection device 20, a first facility 30, and a second facility 40. The devices and facilities can communicate with each other via a network 50. While FIG. 1 shows one control device 10, one detection device 20, one first facility 30, and one second facility 40, the number of devices and facilities included in the system 1 is not limited to this. In FIG. 1, a manhole M is connected to a pipe P and a pipe PZ. The pipe P and the pipe PZ are pipes for communication cables. The pipe P accommodates a power cable C. The pipe PZ accommodates a communication cable CZ.

[0012] The control device 10 controls the current flowing through the power cable C. The control device 10 is installed in a facility such as a power plant, a substation, or a building connected to at least one conduit P accommodating the power cable C. For simplicity, one conduit P is shown in FIG. 1 , but multiple conduits P may be connected to the facility, and the control device 10 may receive temperature information indicating the temperature of each of the multiple conduits P from the detection device 20, as described below.

[0013] The detection device 20 detects the temperature inside the conduit P that accommodates the power cable C. In this embodiment, the detection device 20 functions as a sensor that detects the temperature via an optical fiber 25 inserted inside the conduit P. In FIG. 1 , the detection device 20 is installed inside a manhole M, but the installation location of the detection device 20 is not limited thereto. The detection device 20 may be installed in any location, such as the same facility as or a different facility from the facility where the control device 10 is installed, or a container.

[0014] The first facility 30 supplies electric power to an external supply destination via a power cable C. In this embodiment, the first facility 30 is a power generation facility. The power generation facility includes a generator that generates electric power by any power generation method such as solar power generation.

[0015] The second facility 40 is a facility that can supply power to an external supply destination without using the power cable C. In the present embodiment, the second facility 40 is a power storage facility. The power storage facility may be connected to the power cable C directly or indirectly via an aggregation device, a power distribution device, or the like. The power storage facility may include an inverter, a converter, or the like.

[0016] The network 50 includes the Internet, at least one WAN, at least one MAN, or a combination thereof. "WAN" is an abbreviation for wide area network. "MAN" is an abbreviation for metropolitan area network. The network 50 may include at least one wireless network, at least one optical network, or a combination thereof. The wireless network may be, for example, an ad hoc network, a cellular network, a wireless LAN, a satellite communication network, or a terrestrial microwave network. "LAN" is an abbreviation for local area network.

[0017] An overview of this embodiment will be described. The system 1 includes a control device 10 that controls the current to a power cable C, a detection device 20 that detects the temperature inside a conduit P that houses the power cable C, a first facility 30 that supplies power to an external destination via the power cable C, and a second facility 40 that can supply power to the external destination without via the power cable C. The detection device 20 outputs temperature information indicating the temperature to the control device 10. When the control device 10 determines, based on the temperature information, that the temperature is equal to or higher than a predetermined temperature, it reduces the current and switches at least a portion of the power supply to the external destination from the supply from the first facility 30 to the supply from the second facility 40.

[0018] Hereinafter, a case where the temperature indicated by the temperature information received by the control device 10 from the detection device 20 is below a predetermined temperature is referred to as a normal state, and a case where the temperature is equal to or higher than the predetermined temperature is referred to as a controlled state. The conduit P is a conduit for a communication cable and is formed of a material having a heat resistance of less than 80°C. Specific examples of the conduit P include polyvinyl chloride pipes. However, the conduit P is not limited to this, and may be a steel pipe, a cast iron pipe, or the like. The power cable C is laid by attaching a pulling tool to the tip of the power cable C, inserting it into the inside of the conduit P from one end of the conduit P in a building or manhole to which the conduit P is connected, and then pulling it from the opposite end of the conduit P by another worker. The external supply destination includes any facility, such as a public facility, a residence, or a factory. The external supply destination can receive both power supply from a power generation facility as the first facility 30 via the power cable C and power supply from a power storage facility as the second facility 40. Under normal circumstances, the control device 10 passes current from the power generation facility through the power cable C, and the external supply destination receives the power supply via the power cable C. During control, the control device 10 reduces the current from the power generation facility that passes through the power cable C, and transmits instruction information to the power storage facility indicating an instruction to supply the power stored in the battery to the external supply destination. Upon receiving the instruction information, the power storage facility supplies the power stored in the battery to the external supply destination. The external supply destination receives the power supply from the power generation facility at the reduced current and the power supply from the power storage facility via the power cable C. Alternatively, the external supply destination may receive only the power supply from the power storage facility, not via the power cable C.

[0019] According to this embodiment, the method of supplying power to an external destination is switched from a method of supplying power via a power cable C to a method of supplying power from a power storage facility instead of or in addition to the method of supplying power via the power cable C, depending on the temperature of the conduit P detected in real time. During control, the current flowing through the power cable C is reduced, thereby lowering the temperature of the power cable C. This makes it possible to safely use the conduit P for communication cables. Furthermore, by using a power storage facility, it is possible to stably supply power to external destinations even during control. This makes it possible to suppress the temperature of the conduit from rising due to heat generation from the power cable.

[0020] The configuration of a control device 10 according to this embodiment will be described with reference to Fig. 1. The control device 10 includes a control unit 11, a storage unit 12, and a communication unit 13.

[0021] The control unit 11 includes at least one processor, at least one programmable circuit, at least one dedicated circuit, or any combination thereof. The processor is a general-purpose processor such as a CPU or GPU, or a dedicated processor specialized for specific processing. "CPU" is an abbreviation for central processing unit. "GPU" is an abbreviation for graphics processing unit. An example of the programmable circuit is an FPGA. "FPGA" is an abbreviation for field-programmable gate array. An example of the dedicated circuit is an ASIC. "ASIC" is an abbreviation for application specific integrated circuit. The control unit 11 controls each part of the control unit 10 and executes processing related to the operation of the control unit 10.

[0022] The storage unit 12 includes at least one semiconductor memory, at least one magnetic memory, at least one optical memory, or any combination thereof. The semiconductor memory is, for example, a RAM, a ROM, or a flash memory. "RAM" is an abbreviation for random access memory. "ROM" is an abbreviation for read only memory. RAM is, for example, an SRAM or a DRAM. "SRAM" is an abbreviation for static random access memory. "DRAM" is an abbreviation for dynamic random access memory. ROM is, for example, an EEPROM. "EEPROM" is an abbreviation for electrically erasable programmable read only memory. Flash memory is, for example, an SSD. "SSD" is an abbreviation for solid-state drive. Magnetic memory is, for example, an HDD. "HDD" is an abbreviation for hard disk drive. The storage unit 12 functions, for example, as a main storage device, an auxiliary storage device, or a cache memory. The storage unit 12 stores information used in the operation of the control device 10 and information obtained by the operation of the control device 10 .

[0023] The communication unit 13 includes at least one communication module. The communication module is, for example, a module compatible with a wired LAN communication standard such as Ethernet (registered trademark), a wireless LAN communication standard such as IEEE 802.11, or a mobile communication standard such as LTE, 4G, or 5G. "LAN" is an abbreviation for local area network. "IEEE" is an abbreviation for Institute of Electrical and Electronics Engineers. "LTE" is an abbreviation for Long Term Evolution. "4G" is an abbreviation for 4th generation. "5G" is an abbreviation for 5th generation. The communication unit 13 receives information used in the operation of the control device 10 and transmits information obtained by the operation of the control device 10. The communication unit 13 enables the control device 10 to send and receive information to and from other devices or facilities via the network 50.

[0024] The functions of the control device 10 are realized by executing a program according to this embodiment on a processor serving as the control unit 11. That is, the functions of the control device 10 are realized by software. The program causes a computer to execute the operations of the control device 10, thereby causing the computer to function as the control device 10. That is, the computer functions as the control device 10 by executing the operations of the control device 10 in accordance with the program.

[0025] The program can be stored on a non-transitory computer-readable medium. Examples of the non-transitory computer-readable medium include flash memory, magnetic recording devices, optical disks, magneto-optical recording media, and ROMs. The program can be distributed by selling, transferring, or lending portable media such as SD cards, DVDs, or CD-ROMs that store the program. "SD" is an abbreviation for Secure Digital. "DVD" is an abbreviation for digital versatile disc. "CD-ROM" is an abbreviation for compact disc read only memory. The program can also be distributed by storing it in the storage of a server and transferring it from the server to another computer. The program can also be provided as a program product.

[0026] A computer temporarily stores a program stored on a portable medium or transferred from a server in its main storage device. The computer then reads the program stored in the main storage device with its processor and executes processing in accordance with the read program. The computer may also read the program directly from the portable medium and execute processing in accordance with the program. The computer may also execute processing in accordance with the received program each time a program is transferred from the server to the computer. Processing may also be executed using a so-called ASP-type service that realizes functions simply by issuing execution instructions and obtaining results, without transferring the program from the server to the computer. "ASP" is an abbreviation for application service provider. A program is information used for processing by a computer and includes something equivalent to a program. For example, data that is not a direct instruction to a computer but has properties that define computer processing falls under the category of "something equivalent to a program."

[0027] Some or all of the functions of the control device 10 may be implemented by a programmable circuit or a dedicated circuit as the control unit 11. In other words, some or all of the functions of the control device 10 may be implemented by hardware.

[0028] The configuration of the detection device 20 according to this embodiment will be described with reference to Fig. 2. The detection device 20 includes a control unit 21, a storage unit 22, a communication unit 23, a light source 24, and an optical fiber 25.

[0029] The control unit 21 includes at least one processor, at least one programmable circuit, at least one dedicated circuit, or any combination thereof. The processor is a general-purpose processor such as a CPU or GPU, or a dedicated processor specialized for specific processing. The programmable circuit is, for example, an FPGA. The dedicated circuit is, for example, an ASIC. The control unit 21 executes processing related to the operation of the detection device 20 while controlling each part of the detection device 20. The control unit 21 converts the return light from the optical fiber 25 into an electrical signal, analyzes the electrical signal, and calculates the temperature on the optical fiber 25. The control unit 21 generates temperature information indicating the calculated temperature.

[0030] The storage unit 22 includes at least one semiconductor memory, at least one magnetic memory, at least one optical memory, or any combination thereof. The semiconductor memory is, for example, a RAM, a ROM, or a flash memory. The RAM is, for example, an SRAM or a DRAM. The ROM is, for example, an EEPROM. The flash memory is, for example, an SSD. The magnetic memory is, for example, an HDD. The storage unit 22 functions as, for example, a main storage device, an auxiliary storage device, or a cache memory. The storage unit 22 stores information used in the operation of the detection device 20 and information obtained by the operation of the detection device 20.

[0031] The communication unit 23 includes at least one communication module. The communication module is, for example, a module that supports a wired LAN communication standard such as Ethernet (registered trademark), a wireless LAN communication standard such as IEEE 802.11, or a mobile communication standard such as LTE, 4G standard, or 5G standard. The communication unit 23 receives information used in the operation of the detection device 20 and transmits information obtained by the operation of the detection device 20. The communication unit 23 enables the detection device 20 to send and receive information to and from other devices via the network 50.

[0032] The light source 24 outputs light that is incident on the optical fiber 25 .

[0033] The optical fiber 25 propagates incident light output from the light source 24 and return light corresponding to the incident light. The optical fiber 25 is laid inside the conduit P in which the power cable C is laid. Like the power cable C, the optical fiber 25 is laid by a worker using a pulling jig or the like.

[0034] The configuration of the second facility 40 according to this embodiment will be described with reference to Fig. 3. In this embodiment, the second facility 40 is a power storage facility. The power storage facility includes a control unit 41, a storage unit 42, a communication unit 43, and a battery 44.

[0035] The control unit 41 includes at least one processor, at least one programmable circuit, at least one dedicated circuit, or any combination thereof. The processor is a general-purpose processor such as a CPU or GPU, or a dedicated processor specialized for specific processing. The programmable circuit is, for example, an FPGA. The dedicated circuit is, for example, an ASIC. The control unit 41 executes processing related to the operation of the power storage equipment while controlling each part of the power storage equipment. The control unit 41 controls the start or stop of power supply from the battery 44 to an external supply destination.

[0036] The memory unit 42 includes at least one semiconductor memory, at least one magnetic memory, at least one optical memory, or any combination thereof. The semiconductor memory is, for example, a RAM, a ROM, or a flash memory. The RAM is, for example, an SRAM or a DRAM. The ROM is, for example, an EEPROM. The flash memory is, for example, an SSD. The magnetic memory is, for example, an HDD. The memory unit 42 functions as, for example, a main memory device, an auxiliary memory device, or a cache memory. The memory unit 42 stores information used in the operation of the power storage equipment and information obtained by the operation of the power storage equipment.

[0037] The communication unit 43 includes at least one communication module. The communication module is, for example, a module compatible with a wired LAN communication standard such as Ethernet (registered trademark), a wireless LAN communication standard such as IEEE 802.11, or a mobile communication standard such as LTE, 4G, or 5G. The communication unit 43 receives information used in the operation of the power storage equipment and transmits information obtained by the operation of the power storage equipment. The communication unit 43 enables the power storage equipment to transmit and receive information to and from other devices via the network 50.

[0038] The battery 44 converts the supplied power into, for example, DC power and stores it. The power stored in the battery 44 may be power supplied via the power cable C, or, if the power storage facility itself is equipped with a power generation system, may be power generated by the power generation system.

[0039] Next, the operation of the system 1 according to this embodiment will be described with reference to Figures 4A and 4B. In the following, it is assumed that the temperature information is constantly transmitted from the detection device 20 in real time.

[0040] In step S101, the control unit 21 of the detection device 20 transmits temperature information indicating the temperature inside the pipeline P to the control device 10 via the communication unit 23. Specifically, the control unit 21 analyzes the return light of the optical fiber 25 to generate temperature information indicating the temperature of the pipeline P. The temperature information may include position information indicating an arbitrary position in the pipeline P where the temperature is detected. The temperature information may include identification information that identifies the pipeline P in which the optical fiber 25 is installed.

[0041] In step S102 , the control unit 11 of the control device 10 receives the temperature information from the detection device 20 via the communication unit 13 .

[0042] In step S103, the control unit 11 determines whether the temperature indicated by the temperature information is equal to or higher than a predetermined temperature. If it is equal to or higher than the predetermined temperature, the operation of the system 1 proceeds to S104. If it is lower than the predetermined temperature, the operation of the system 1 returns to S101. The predetermined temperature may be set in advance by the user, for example. The predetermined temperature is, for example, 70°C.

[0043] In step S104, the control unit 11 reduces the current flowing through the power cable C. At the same time, the control unit 11 transmits, to the power storage equipment via the communication unit 13, instruction information indicating an instruction to supply the power stored in the power storage equipment to an external supply destination.

[0044] When the temperature information includes identification information, the control unit 11 can grasp the temperature of each of the multiple conduits P based on the identification information. The control unit 11 may identify a power cable C laid in the conduit P indicated by the identification information and reduce the current flowing through the identified power cable C. In this case, the control unit 11 may identify at least one power cable C among the multiple power cables C by referring to information previously stored in the memory unit 12, which associates the multiple conduits P with the multiple power cables C. The control unit 11 further identifies a power storage facility that can supply power to an external supply destination that receives power via the identified power cable C. The control unit 11 may identify at least one power storage facility among the multiple power storage facilities by referring to information previously stored in the memory unit 12, which associates the multiple power cables C with the multiple power storage facilities. The control unit 11 transmits instruction information to the identified power storage facility. When a plurality of external supply destinations are connected to the identified power cable C via a power distribution device or an aggregation device, the control unit 11 may identify a plurality of power storage facilities that supply power to the plurality of external supply destinations. In this case, the control unit 11 transmits instruction information to each of the identified plurality of power storage facilities via the communication unit 13.

[0045] The degree to which the current flowing through the power cable C is reduced may be set in advance. For example, the control unit 11 may control the current so that the current flowing through the power cable C is less than a predetermined value that is set in advance. For example, the control unit 11 may control the current so that the current flowing through the power cable C is less than a predetermined percentage of the current flowing through the power cable C under normal conditions. For example, the control unit 11 may control the current so that the current flowing through the power cable C is zero.

[0046] For example, the control unit 11 may set the degree to which the current flowing through the identified power cable C is reduced depending on the number of external supply destinations receiving power from the first facility 30 via the identified power cable C, the total amount of power demand at the external supply destinations, or the like. In this case, the control unit 11 may receive information indicating the power demand at the external supply destinations from smart meters or the like installed at the external supply destinations via the communication unit 13, and calculate the total amount based on the information. The control unit 11 sets a smaller degree to which the current is reduced as the number of external supply destinations or the total amount of power demand increases. This makes it possible to stabilize the supply of power to the external supply destinations even when the current flowing through the power cable C is reduced.

[0047] In step S105 , the control unit 41 of the power storage facility serving as the second facility 40 receives the instruction information via the communication unit 43 .

[0048] In step S106, the control unit 41 supplies power to the external supply destination from the battery 44. As a result, the method of supplying power to the external supply destination is switched to the method of supplying power from the power storage facility instead of or in addition to the method of supplying power via the power cable C.

[0049] In step S107 , the control unit 21 of the detection device 20 transmits the temperature information to the control device 10 via the communication unit 23 .

[0050] In step S108 , the control unit 11 of the control device 10 receives the temperature information via the communication unit 13 .

[0051] In step S109, the control unit 11 determines whether the temperature indicated by the temperature information is equal to or higher than a predetermined temperature. If the temperature is equal to or higher than the predetermined temperature, the operation of the system 1 repeats step S109. If the temperature is lower than the predetermined temperature, the operation of the system 1 proceeds to step S110.

[0052] In step S110, the control unit 11 increases the current flowing through the power cable C. At the same time, the control unit 11 transmits, to the power storage equipment via the communication unit 13, stop instruction information indicating an instruction to stop supply of the power stored in the power storage equipment to an external supply destination.

[0053] In step S111 , the control unit 41 of the power storage facility receives the stop instruction information via the communication unit 43 .

[0054] In step S112, the control unit 41 stops the supply of power from the battery 44 to the external supply destination. This switches the method of supplying power to the external supply destination to a method via only the power cable C. Thereafter, the operation of the system 1 returns to step S101.

[0055] (First Modification) As a first modification of the present disclosure, a case will be described in which the control unit 11 of the control device 10 compares the temperature indicated by the temperature information with a plurality of threshold temperatures and, based on the comparison result, sets the current to be passed through the power cable C. In this modification, the configurations of the devices and equipment in the system 1 are similar to those in the above-described embodiment, and therefore description thereof will be omitted.

[0056] In this modification, the control unit 11 compares the temperature indicated by the temperature information received from the detection device 20 with a plurality of threshold temperatures. The control unit 11 sets a degree of reduction of the current flowing through the power cable C to a greater extent as the temperature indicated by the temperature information exceeds a higher threshold temperature among the plurality of threshold temperatures. This makes it possible to more flexibly avoid situations in which an increase in the temperature of the conduit P causes deformation of the conduit P, etc.

[0057] (Second Modification) As a second modification of the present disclosure, a case will be described in which the control unit 11 of the control device 10 sets the degree of current reduction based on the rate of change in the amount of stored electricity in the electricity storage facility, instead of or in addition to determining whether the temperature indicated by the temperature information is below a predetermined temperature. In this modification, the configurations of the devices and facilities in the system 1 are the same as those in the above-described embodiment, and therefore description thereof will be omitted.

[0058] In this modification, the control unit 11 receives stored energy amount information indicating the amount of stored power from the power storage equipment via the communication unit 13, and sets the degree of reduction of the current flowing through the power cable C based on the stored energy amount information. Specifically, the control unit 11 first calculates a rate of change in the stored energy amount based on the stored energy amount information. Specifically, the rate of change is a rate of reduction in the amount of stored energy in the battery 44 of the power storage equipment. When the control unit 11 determines that the rate of change in the stored energy amount is equal to or greater than a predetermined rate of change, the control unit 11 sets the degree of reduction of the current to be smaller than when the rate of change is less than the predetermined rate. The control unit 11 may also set the degree of reduction of the current to be smaller when the amount of stored energy indicated by the stored energy amount information is less than a predetermined value. In this way, when the rate of reduction of the stored energy amount is large, the degree of reduction of the current to the power cable C is kept small, thereby preventing a power shortage at the external supply destination and stabilizing the supply of power to the external supply destination.

[0059] (Third Modification) As a third modification of the present disclosure, a case will be described in which the control unit 11 of the control device 10 sets the degree of current reduction based on the rate of change of the temperature indicated by the temperature information, instead of or in addition to determining whether the temperature indicated by the temperature information is below a predetermined temperature. In this modification, the configurations of the devices and equipment of the system 1 are the same as those in the above-described embodiment, and therefore description thereof will be omitted.

[0060] For example, the control unit 11 may set the degree to which the current flowing through the power cable C is to be reduced based on the temperature information received from the detection device 20. Specifically, the control unit 11 first calculates the rate of change of the temperature based on the temperature information. Specifically, the rate of change is the rate of increase in the temperature inside the conduit P. When the control unit 11 determines that the rate of change of the temperature is equal to or greater than a predetermined rate of change, it sets the degree to which the current is to be reduced to a greater extent than when the rate of change is less than the predetermined rate of change. This makes it possible to prevent a situation in which the temperature of the conduit P increases suddenly, resulting in deformation of the conduit P, or the like.

[0061] The following additional notes are provided regarding the above-described embodiments.

[0062] (Supplementary Item 1) A system comprising: a control device that controls a current to a power cable; a detection device that detects the temperature inside a conduit that accommodates the power cable; a first facility that supplies power to an external destination via the power cable; and a second facility that can supply power to the external destination without via the power cable, wherein the detection device outputs temperature information indicating the temperature to the control device, and when the control device determines based on the temperature information that the temperature is equal to or higher than a predetermined temperature, the control device reduces the current and switches at least a portion of the power supply to the external destination from the supply from the first facility to the supply from the second facility. (Supplementary Item 2) The system described in Supplementary Item 1, wherein the detection device includes a sensor that detects the temperature via an optical fiber inserted into the conduit. (Supplementary Item 3) The system described in Supplementary Item 1 or 2, wherein the first facility is a power generation facility, and the second facility is a power storage facility. (Supplementary Item 4) The system according to any one of Supplementary Items 1 to 3, wherein the pipeline is formed of a material having a heat resistance of less than 80°C.

[0063] The present disclosure is not limited to the above-described embodiments. For example, two or more blocks shown in the block diagram may be integrated, or one block may be divided. Two or more steps shown in the flowchart may be executed in parallel or in a different order, instead of being executed in chronological order as described, depending on the processing capabilities of the device executing each step, or as needed. Other modifications are possible within the scope of the present disclosure.

[0064] REFERENCE SIGNS LIST 1 System 10 Control device 11 Control unit 12 Memory unit 13 Communication unit 20 Detection device 21 Control unit 22 Memory unit 23 Communication unit 24 Light source 25 Optical fiber 30 First facility, power generation facility 40 Second facility, power storage facility 41 Control unit 42 Memory unit 43 Communication unit 44 Battery 50 Network

Claims

1. A system comprising: a control device that controls the current to a power cable; a detection device that detects the temperature inside a pipe that houses the power cable; a first facility that supplies power to an external destination via the power cable; and a second facility that can supply power to the external destination without via the power cable, wherein the detection device outputs temperature information indicating the temperature to the control device, and when the control device determines based on the temperature information that the temperature is equal to or higher than a predetermined temperature, the system reduces the current and switches at least a portion of the power supply to the external destination from the supply from the first facility to the supply from the second facility.

2. A system according to claim 1, wherein said detection device includes a sensor that detects said temperature via an optical fiber inserted into said conduit.

3. A system according to claim 1 or 2, wherein the first facility is a power generation facility, and the second facility is a power storage facility.

4. A system according to claim 1 or 2, wherein the conduit is made of a material having a heat resistance of less than 80°C.

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