Marine vessel

Abstract

A marine vessel according to one aspect of the present disclosure comprises: a hull that includes a bow part and a stern part which is positioned rearward of the bow part; a plurality of power consumption devices that are positioned in the bow part and that consume power; a main power source that is positioned in the stern part and that operates in a normal time; an emergency power source that is positioned in the stern part and that operates in an emergency; a main cable that delivers electricity which has been outputted from the main power source to the bow part; an emergency cable that delivers electricity which has been outputted from the emergency power source to the bow part; a main splitter that is positioned in the bow part and that splits the electricity which has been delivered by the main cable; an emergency splitter that is positioned in the bow part and that splits the electricity which has been delivered by the emergency cable; a main splitter cable that delivers the electricity which has been split by the main splitter to at least one of the plurality of the power consumption devices; an emergency splitter cable that delivers the electricity which has been split by the emergency splitter to at least one of the plurality of the power consumption devices; a main splitting chamber that is positioned in the bow part and that has the main splitter installed therein; an emergency splitting chamber that is positioned in the bow part and that has the emergency splitter installed therein; and a separation chamber that is positioned between the main splitting chamber and the emergency splitting chamber and that separates the main splitting chamber and the emergency splitting chamber.

Description

ship

[0001] The present disclosure relates to marine vessels.

[0002] The following Patent Document 1 describes a distributed power supply system in which a distributor is used to branch a main power supply circuit installed on board a ship into branch circuits, and the branch circuits supply power to electrical equipment on board the ship.

[0003] Japanese Unexamined Patent Publication No. 63-43531

[0004] Some ships have a main power supply and an emergency power supply located at the stern and multiple power consumption devices located at the bow. In such ships, if a branching device that branches off electricity output from the main power supply (hereinafter referred to as the "main branching device") and a branching device that branches off electricity output from the emergency power supply (hereinafter referred to as the "emergency branching device") are located at the bow, the number of power cables extending from the stern to the bow can be reduced, and the wiring of the power cables can be simplified.

[0005] Here, the purpose of the emergency power supply is to supply electricity to power consuming devices in an emergency, but this "emergency" includes not only when a problem occurs with the main power supply itself, but also when the above-mentioned main branching device is damaged by fire, etc. If the main branching device is damaged by fire and the emergency branching device is similarly damaged, electricity cannot be supplied from the emergency power supply to the power consuming devices, and the original purpose of the emergency power supply cannot be achieved.

[0006] Therefore, an object of the present disclosure is to provide a ship in which the emergency branching device can operate normally without being damaged even if the main branching device is damaged by a fire.

[0007] A vessel according to one aspect of the present disclosure includes a hull including a bow section and a stern section located aft of the bow section, a plurality of power consumption devices located at the bow section that consume electricity, a main power supply located at the stern section that operates under normal circumstances, an emergency power supply located at the stern section that operates in an emergency, a main cable that transmits electricity output from the main power supply to the bow section, an emergency cable that transmits electricity output from the emergency power supply to the bow section, a main branching device located at the bow section that branches the electricity transmitted by the main cable, and a power consumption device located at the bow section that transmits electricity output from the emergency power supply to the bow section. the main branching device that branches electricity sent by the cable; a main branching cable that sends the electricity branched by the main branching device to at least one of the plurality of power consumption devices; an emergency branching cable that sends the electricity branched by the emergency branching device to at least one of the plurality of power consumption devices; a main branching room located in the bow section and in which the main branching device is installed; an emergency branching room located in the bow section and in which the emergency branching device is installed; and a separation room located between the main branching room and the emergency branching room and separating the main branching room from the emergency branching room.

[0008] According to a ship according to one aspect of the present disclosure, even if the main branching device is damaged by a fire, the emergency branching device can operate normally without being damaged.

[0009] Fig. 1 is an overall view of a ship. Fig. 2 is a block diagram of an electrical supply system. Fig. 3 is a longitudinal sectional view of a bow structure. Fig. 4 is a longitudinal sectional view of a bow structure of a ship according to a modified example.

[0010] The watercraft 100 according to the embodiment will be described below.

[0011] (Overall configuration of ship) First, the overall configuration of the ship 100 will be described. FIG. 1 is an overall view of the ship 100. Hereinafter, the propulsion direction of the ship 100 (to the right on the paper in FIG. 1 ) will be referred to as the "forward" direction, and the direction opposite to the propulsion direction of the ship 100 (to the left on the paper in FIG. 1 ) will be referred to as the "aft" direction. The ship 100 according to this embodiment is a liquefied gas carrier that transports liquefied gas such as liquefied hydrogen or liquefied natural gas. However, the ship 100 is not limited to a liquefied gas carrier.

[0012] The hull 10 of the ship 100 according to this embodiment includes a bow section 11, a stern section 12, and a cargo section 13. These components will be described in order below.

[0013] The bow section 11 corresponds to the forward part of the hull 10. In this embodiment, a bow structure 20 is located in the bow section 11. The bow structure 20 in this embodiment includes, for example, an accommodation area where passengers live and work, and a wheelhouse where the operator operates the vessel. The bow structure 20 has multiple floors 21a to 21f (see FIG. 3). Multiple power consumption devices 14 that consume power are located on each of the floors 21a to 21e. The power consumption devices 14 include, for example, air conditioning equipment, lighting equipment, and steering equipment. The locations of the power consumption devices 14 are not limited, and they may be located, for example, on the interior floor 21f (see FIG. 3).

[0014] The stern section 12 is located rearward of the bow section 11 and corresponds to the rear part of the hull 10. In this embodiment, the stern section 12 is provided with a main engine and the like for generating propulsive force for the hull 10. Furthermore, in this embodiment, a main power supply 31 that operates under normal circumstances and an emergency power supply 32 that operates in an emergency are also located therein.

[0015] The cargo section 13 is a section that accommodates liquefied gas as cargo. The cargo section 13 is located aft of the bow section 11 and forward of the stern section 12, and corresponds to the center section in the longitudinal direction of the hull 10. In this embodiment, the cargo section 13 is provided with a plurality of cargo tanks 15 that store liquefied gas.

[0016] (Electricity Supply System) Next, the electricity supply system 30 of the vessel 100 will be described. Fig. 2 is a block diagram of the electricity supply system 30. The electricity supply system 30 can supply electricity from a main power source 31 and an emergency power source 32 to each device installed on the vessel 100. Fig. 2 shows a portion of the electricity supply system 30 that supplies electricity from the main power source 31 and the emergency power source 32 to each power consumption device 14 located in the bow section 11.

[0017] 2, the electric power supply system 30 includes a main power supply 31, an emergency power supply 32, a main cable 33, an emergency cable 34, a main branching device 35, an emergency branching device 36, a main branching cable 37, and an emergency branching cable 38. These components will be described in order below.

[0018] As described above, the main power supply 31 is located in the stern 12 and is a power supply that operates normally. In Fig. 2, a main cable 33 is connected to the main power supply 31. Note that although the main power supply 31 in this embodiment is a power generation device, it may also be a power storage device, or may be a device that combines a power generation device and a power storage device.

[0019] As described above, the emergency power supply 32 is located in the stern section 12 and is a power supply that operates in an emergency. An emergency here refers to a situation in which sufficient electricity cannot be supplied to each device from the main power supply 31. Although the emergency power supply 32 in this embodiment is a power generation device, it may also be a power storage device, or a device that combines a power generation device and a power storage device.

[0020] The main cable 33 is a power cable that transmits electricity output from the main power supply 31 to the bow section 11. In this embodiment, the main cable 33 extends from the stern section 12 through the cargo section 13 to the bow section 11. Note that although the main cable 33 shown in Fig. 2 is directly connected to the main power supply 31, a switchboard, for example, may be located between the main power supply 31 and the main cable 33. In other words, the main cable 33 may be connected to the main power supply 31 via a switchboard.

[0021] The emergency cable 34 is a power cable that transmits electricity output from the emergency power supply 32 to the bow section 11. In this embodiment, the emergency cable 34 extends from the stern section 12 through the cargo section 13 to the bow section 11. As described above, in this embodiment, electricity output from the main power supply 31 and electricity output from the emergency power supply 32 are transmitted to the bow section 11 using different power cables. Note that although the emergency cable 34 shown in FIG. 2 is directly connected to the emergency power supply 32, a switchboard, for example, may be located between the emergency power supply 32 and the emergency cable 34. In other words, the emergency cable 34 may be connected to the emergency power supply 32 via a switchboard. Note that the emergency cable 34 may be connected to not only the emergency power supply 32 but also the main power supply 31 via a switchboard, and may normally transmit electricity supplied from the main power supply 31 to the bow section 11, and may transmit electricity supplied from the emergency power supply 32 to the bow section 11 in an emergency when the main power supply 31 is lost.

[0022] The main branching device 35 is a device that branches the electricity transmitted through the main cable 33. The main branching device 35 may be a switchboard, a feeder panel, a section board, or a distribution board. The main branching device 35 of this embodiment is connected to the main cable 33 and is located in the bow section 11. In this embodiment, since the main branching device 35 is located in the bow section 11, the number of power cables passing through the cargo section 13 can be reduced compared to when the main branching device 35 is located in the stern section 12, and the wiring of the power cables can be simplified.

[0023] The emergency branching device 36 is a device that branches the electricity transmitted through the emergency cable 34. The emergency branching device 36 may be a distribution board, a power supply board, a power distribution board, or a switchboard. The emergency branching device 36 of this embodiment is connected to the emergency cable 34 and is located in the bow section 11. In this embodiment, because the emergency branching device 36 is located in the bow section 11, the number of power cables passing through the cargo section 13 can be reduced compared to when the emergency branching device 36 is located in the stern section 12, and the wiring of the power cables can be simplified.

[0024] The main branch cable 37 is a power cable that transmits electricity branched by the main branch unit 35 to at least one of the plurality of power consumption devices 14. A plurality of main branch cables 37 are connected to the main branch unit 35, and each main branch cable 37 extends toward a corresponding power consumption device 14. In Fig. 2, the main branch cables 37 are directly connected to the power consumption devices 14, but the main branch cables 37 may also be connected to the power consumption devices 14 via, for example, a distribution board.

[0025] The emergency branch cable 38 is a power cable that transmits electricity branched by the emergency branch device 36 to at least one of the multiple power consumption devices 14. The power consumption devices 14 to which the emergency branch cable 38 supplies electricity and the power consumption devices 14 to which the main branch cable 37 supplies electricity may all overlap, may partially overlap, or may be different. A plurality of emergency branch cables 38 are connected to the emergency branch device 36, and each emergency branch cable 38 extends toward a corresponding power consumption device 14. In this way, electricity is supplied to each power consumption device 14 from at least one of the main branch cable 37 and the emergency branch cable 38.

[0026] If electricity is supplied to each power consumption device 14 from both the main branch cable 37 and the emergency branch cable 38, electricity is supplied to each power consumption device 14 via the main branch cable 37 during normal operation, and via the emergency branch cable 38 during an emergency. However, if the emergency cable 34 is also connected to the main power supply 31, electricity is supplied to each power consumption device 14 via both the main branch cable 37 and the emergency branch cable 38 during normal operation. Note that although the emergency branch cable 38 is directly connected to the power consumption device 14 in Fig. 2, the emergency branch cable 38 may also be connected to the power consumption device 14 via a distribution board, for example.

[0027] (Layout of Electrical Supply System) Next, the layout of the components of the electrical supply system 30 located in the bow section 11 will be described. In this embodiment, the components of the electrical supply system 30 located in the bow section 11 are mainly installed inside the bow structure 20 (see FIG. 1 ). FIG. 3 is a longitudinal cross-sectional view of the bow structure 20. More precisely, FIG. 3 is a view of a cross section perpendicular to the fore-and-aft direction of the bow structure 20 as seen from the rear (the same applies to FIG. 4 described below). Below, the layout of the components of the electrical supply system 30 will be described while explaining the configuration of the bow structure 20.

[0028] As shown in Figure 3, the bow structure 20 of this embodiment has five floors located above the upper deck 16 (see also Figure 1), specifically, from bottom to top, a first floor 21a, a second floor 21b, a third floor 21c, a fourth floor 21d, and a fifth floor 21e. The bow structure 20 also has an interior floor 21f located below the upper deck 16. However, the floors of the bow structure 20 are not limited to those described above. Furthermore, power consumption devices 14 are located on each of the floors 21a to 21e located above the upper deck 16.

[0029] 3, the bow structure 20 has a main branch room 22, an emergency branch room 23, a separation room 24, and a floor penetration room 25. These rooms 22 to 25 will be described in order below.

[0030] The main branch room 22 is a room in which the main branch device 35 is installed. In this embodiment, the main branch room 22 is located on the interior floor 21 f of the bow structure 20. In other words, the main branch room 22 is located below the upper deck 16. However, the main branch room 22 may be located above the interior floor 21 f, that is, above the upper deck 16.

[0031] The emergency branch room 23 is a room in which the emergency branch device 36 is installed. In this embodiment, the emergency branch room 23 is located on the interior floor 21f of the bow structure 20. In other words, the emergency branch room 23 is located below the upper deck 16 and at the same height as the main branch room 22. However, as will be described in a modified example below, the emergency branch room 23 may be located above the upper deck 16 or above the main branch room 22. The emergency branch room 23 may have the same or different volume and shape as the main branch room 22.

[0032] The separation room 24 is located between the main branch room 22 and the emergency branch room 23 and separates the main branch room 22 from the emergency branch room 23. Here, the separation of the main branch room 22 and the emergency branch room 23 refers to a state in which the main branch room 22 and the emergency branch room 23 are not in contact with each other at a surface, a line, or a point. The separation room 24 in this embodiment is formed by a single space, but may be formed by multiple spaces. In other words, the separation room 24 may include multiple spaces. Furthermore, the separation room 24 in this embodiment is located on the interior floor 21f of the bow structure 20, but may be located across multiple floors. The separation room 24 may also be used as another compartment with a low risk of fire.

[0033] As described above, in this embodiment, the separation chamber 24 separates the main branch chamber 22 and the emergency branch chamber 23, so that even if a fire breaks out in the main branch chamber 22 and the main branch device 35 is damaged, the fire that broke out in the main branch chamber 22 can be prevented from spreading to the emergency branch device 36 in the emergency branch chamber 23. As a result, even if the main branch device 35 is damaged by fire, the emergency branch device 36 can operate normally without being damaged.

[0034] The floor penetration chamber 25 is a chamber that passes through the multiple floors 21a to 21e. The floor penetration chamber 25 of this embodiment passes through the first floor 21a, the second floor 21b, the third floor 21c, the fourth floor 21d, and the fifth floor 21e, which are located above the upper deck 16 of the bow structure 20. The floor penetration chamber 25 is covered with an outer wall formed of, for example, fireproof panels. A main branch cable 37 and an emergency branch cable 38 are laid inside the floor penetration chamber 25. In other words, the floor penetration chamber 25 guides the main branch cable 37 and the emergency branch cable 38 to each of the floors 21a to 21e.

[0035] Here, consider a case where, instead of using the floor penetration chamber 25, through-holes are formed in the floors of each floor 21a-21e to guide the main branch cable 37 and the emergency branch cable 38 to each floor 21a-21e. In this case, if a fire breaks out on one floor, there is a risk that the flames will spread to adjacent floors through the through-holes, and there is also a risk that the main branch cable 37 and the emergency branch cable 38 will be damaged by the fire. In contrast, if the floor penetration chamber 25 is used as in this embodiment, the spread of fire to each floor 21a-21e can be suppressed, and damage to the main branch cable 37 and the emergency branch cable 38 due to the fire can be suppressed. Furthermore, because the floor penetration chamber 25 can form a dedicated compartment independent of other rooms, it is possible to exclude equipment and the like that could be a source of fire from the compartment through which the main branch cable 37 and the emergency branch cable 38 pass.

[0036] Furthermore, the floor penetration chamber 25 communicates with the separation chamber 24. That is, the internal space of the floor penetration chamber 25 and the internal space of the separation chamber 24 are continuously connected. In this embodiment, the main branch cable 37 connected to the main branch device 35 extends from the main branch chamber 22 through the separation chamber 24 and the floor penetration chamber 25 in this order toward each power consumption device 14. Note that a hole through which the main branch cable 37 passes may be formed in the wall between the main branch chamber 22 and the separation chamber 24. As described above, in this embodiment, the main branch cable 37 extending from the main branch device 35 is temporarily introduced into the separation chamber 24. This allows the main branch cable 37 to be organized within the separation chamber 24, making it easier to handle the main branch cable 37.

[0037] Similarly, in this embodiment, the emergency branch cable 38 connected to the emergency branch device 36 extends from the emergency branch room 23 through the separation room 24 and the floor penetration room 25 in this order toward each power consumption device 14. Note that a hole through which the emergency branch cable 38 passes may be formed in the wall between the emergency branch room 23 and the separation room 24. As described above, in this embodiment, the emergency branch cable 38 extending from the emergency branch device 36 is once introduced into the separation room 24. Therefore, the emergency branch cable 38 can be organized within the separation room 24, making it easier to handle the emergency branch cable 38.

[0038] Furthermore, as described above, in this embodiment, both the main branch cable 37 extending from the main branch device 35 and the emergency branch cable 38 extending from the emergency branch device 36 are once introduced into the separation room 24. Therefore, the main branch cable 37 and the emergency branch cable 38 can be laid together rather than separately. As a result, the main branch cable 37 and the emergency branch cable 38 can be laid efficiently.

[0039] As described above, in this embodiment, the main branch room 22, the emergency branch room 23, the separation room 24, and the floor penetration room 25 are located inside the bow structure 20. However, each of these rooms 22 to 25 only needs to be located in the bow section 11, and does not have to be located inside the bow structure 20.

[0040] (Modification) Next, a boat 100 according to a modification will be described. The boat 100 according to the modification differs from the boat 100 according to the above-described embodiment in the internal structure of the bow structure 20, i.e., the arrangement of the components of the electrical supply system 30, but otherwise has basically the same configuration. The bow structure 20 of the boat 100 according to the modification will be described below.

[0041] 4 is a longitudinal cross-sectional view of the bow structure 20 of the ship 100 according to the modified example. As shown in Fig. 4, in the ship 100 according to the modified example, the main branch device 35 is located on the interior floor 21f, while the emergency branch room 23 is located on the first floor 21a. In other words, the emergency branch room 23 is located above the main branch room 22 and above the upper deck 16.

[0042] As described above, in the ship 100 according to the modified example, the emergency branch chamber 23 is located higher than the main branch chamber 22. Therefore, the emergency branch chamber 23 is less susceptible to flooding than the main branch chamber 22. Therefore, even if the main branch device 35 is damaged by flooding, the emergency branch device 36 can operate until the emergency branch chamber 23 is flooded.

[0043] Furthermore, in the ship 100 according to the modified example, the emergency branch room 23 is located above the upper deck 16. Therefore, the emergency branch room 23 is less likely to be flooded than when the emergency branch room 23 is located below the upper deck 16. Therefore, it is possible to reduce the possibility that the emergency branch device 36 will be damaged by flooding.

[0044] In the ship 100 according to the modified example, the separation chamber 24 is also located between the main branch room 22 and the emergency branch room 23, and the separation chamber 24 separates the main branch room 22 from the emergency branch room 23. Therefore, even if the main branch device 35 is damaged by a fire, the emergency branch device 36 can operate normally without being damaged.

[0045] Furthermore, in the ship 100 according to the modified example, the emergency branch cable 38 extends toward each power consumption device 14 through the floor penetration room 25 without passing through the separation room 24. In this way, depending on the arrangement of the rooms 22 to 25, the emergency branch cable 38 may extend toward each power consumption device 14 without passing through the separation room 24. Similarly, the main branch cable 37 may also extend toward each power consumption device 14 without passing through the separation room 24.

[0046] (Summary) A first item disclosed in this specification is a hull including a bow section and a stern section located aft of the bow section, a plurality of power consumption devices located at the bow section and consuming power, a main power supply located at the stern section and operating under normal circumstances, an emergency power supply located at the stern section and operating in an emergency, a main cable that transmits electricity output from the main power supply to the bow section, an emergency cable that transmits electricity output from the emergency power supply to the bow section, a main branching device located at the bow section that branches the electricity transmitted by the main cable, and a power consumption device located at the bow section and operating under the emergency cable. a main branch cable that sends the electricity branched by the emergency branch device to at least one of the plurality of power consumption devices; an emergency branch cable that sends the electricity branched by the emergency branch device to at least one of the plurality of power consumption devices; a main branch room located in the bow section and in which the main branch device is installed; an emergency branch room located in the bow section and in which the emergency branch device is installed; and a separation room located between the main branch room and the emergency branch room and separating the main branch room from the emergency branch room.

[0047] With this configuration, the separation chamber separates the main branching chamber from the emergency branching chamber, so that even if the main branching device is damaged by a fire, the emergency branching device can operate normally without being damaged.

[0048] A second item disclosed in this specification is the vessel described in the first item, wherein the main branch cable extends from the main branch room through the separation room toward at least one of the plurality of power consumption devices.

[0049] According to this configuration, the main branch cable extending from the main branching device is temporarily introduced into the separation chamber, so that the main branch cable can be organized within the separation chamber, making it easier to handle the main branch cable.

[0050] A third item disclosed in this specification is the ship described in the first or second item, wherein the emergency branch cable extends from the emergency branch room through the separation room toward at least one of the plurality of power consumption devices.

[0051] According to this configuration, the emergency branch cable extending from the emergency branch device is temporarily introduced into the separation room, so that the emergency branch cable can be organized within the separation room, making it easier to handle the emergency branch cable.

[0052] A fourth item disclosed in this specification is the vessel according to the second or third item, further comprising a floor penetration chamber located in the bow, in which the main branch cable and the emergency branch cable are laid, and which passes through a plurality of floors, and the floor penetration chamber is in communication with the separation chamber.

[0053] With this configuration, the floor penetration chamber and the separation chamber are connected, making it easy to introduce the main branch cable that has passed through the separation chamber or the emergency branch cable that has passed through the separation chamber into the floor penetration chamber, thereby simplifying the wiring of each power cable.

[0054] A fifth item disclosed in this specification is the vessel described in any one of the first to fourth items, in which the emergency branch room is located above the main branch room.

[0055] With this configuration, the emergency branch room is less susceptible to flooding than the main branch room, so even if the main branch device is damaged by flooding, the emergency branch device can continue to operate until the emergency branch room is flooded.

[0056] A sixth item disclosed in this specification is the vessel described in any one of the first to fifth items, in which the emergency branch room is located above the upper deck.

[0057] With this configuration, the emergency branch room is less susceptible to flooding than when it is located below the upper deck, thereby reducing the possibility of the emergency branch device being damaged by flooding.

[0058] A seventh item disclosed in this specification is a vessel described in any one of the first to fourth items, in which the hull is located aft of the bow section and forward of the stern section, and includes a cargo section for accommodating cargo.

[0059] When the main power supply and emergency power supply are located at the stern, the number of power cables installed between the stern and bow can be reduced by arranging the main branching device and the emergency branching device at the bow, and the wiring of the power cables can be simplified. Furthermore, when the hull includes a cargo section, that is, when the bow and stern are far apart, as in the above configuration, the effect of simplifying the wiring can be more easily achieved.

[0060] REFERENCE SIGNS LIST 10 Hull 11 Bow section 12 Stern section 13 Cargo section 14 Power consumption device 15 Cargo tank 16 Upper deck 20 Bow structure 21a First floor 21b Second floor 21c Third floor 21d Fourth floor 21e Fifth floor 21f Interior floor 22 Main branch room 23 Emergency branch room 24 Separation room 25 Floor penetration room 30 Electrical supply system 31 Main power supply 32 Emergency power supply 33 Main cable 34 Emergency cable 35 Main branch device 36 Emergency branch device 37 Main branch cable 38 Emergency branch cable 100 Ship

Claims

1. A hull including a bow section and a stern section located aft of the bow section; a plurality of power consumption devices located at the bow section that consume electricity; a main power supply located at the stern section that operates under normal circumstances; an emergency power supply located at the stern section that operates in an emergency; a main cable that sends electricity output from the main power supply to the bow section; an emergency cable that sends electricity output from the emergency power supply to the bow section; a main branching device located at the bow section that branches the electricity sent by the main cable; an emergency branching device located at the bow section that branches the electricity sent by the emergency cable; a main branching cable that sends the electricity branched by the main branching device to at least one of the plurality of power consumption devices; an emergency branching cable that sends the electricity branched by the emergency branching device to at least one of the plurality of power consumption devices; a main branching room located at the bow section in which the main branching device is installed; and an emergency branching room located at the bow section in which the emergency branching device is installed. a separation chamber located between the main branch room and the emergency branch room, separating the main branch room and the emergency branch room.

2. The vessel according to claim 1, wherein the main branch cable extends from the main branch room through the separation room toward at least one of the plurality of power consuming devices.

3. The ship according to claim 1, wherein the emergency branch cable extends from the emergency branch room through the separation room toward at least one of the plurality of power consuming devices.

4. A ship as described in claim 2 or 3, further comprising a floor penetration chamber located in the bow, in which the main branch cable and the emergency branch cable are laid, and which passes through a plurality of floors, and the floor penetration chamber is in communication with the separation chamber.

5. A vessel as claimed in claim 1, wherein the emergency branch room is located above the main branch room.

6. A ship according to claim 1, wherein the emergency branch room is located above the upper deck.

7. The vessel of claim 1, wherein the hull includes a cargo section located aft of the bow section and forward of the stern section for accommodating cargo.

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