CN215580385U - Three-level distribution power station system for ship - Google Patents

Abstract

The utility model provides a three-level distribution power station system for a ship, which relates to the technical field of ship electricity and comprises a primary AC690V distribution board, a secondary AC380V distribution board and a secondary AC220V distribution board; the primary AC690V switchboard includes an AC690V combination starter panel, an AC690V load panel, an AC690V main transformer panel, an AC690V generator panel, an AC690V generator panel, a bow thrust and synchronization panel, an AC690V generator panel and a stern thrust panel; the secondary AC380V panelboard includes an AC380V load screen, an AC380V main transformer screen; the secondary AC220V panelboard includes an AC220V load panel, the AC220V load panel connected to a service transformer. The distribution voltage of the utility model has three stages, the AC690V voltage is used for supplying power to a large load with the power exceeding 100kW, the AC380V voltage is used for supplying power to a middle-stage load with the power between 0.75kW and 100kW, and the AC220V voltage is used for supplying power to a small load with the power less than 0.75 kW.

Description

Three-level distribution power station system for ship

Technical Field

The utility model relates to the technical field of ship electricity, in particular to a ship three-stage power distribution station system.

Background

The electric equipment of ordinary cargo ship is limited, and two-stage distribution power station of AC380V and AC220V is generally adopted to the boats and ships power station, and AC380V is used for supplying power for dragging equipment such as motor etc. and AC220V is used for supplying power for small-size electric equipment such as lamps and lanterns etc. this kind of two-stage distribution power station, comparatively simple, economy, but the capacity is less, and busbar current upper limit is only 8000A.

Due to the requirement of a cargo maintenance system, a large-scale LNG transport ship must be provided with a high-power reliquefaction device, so that the capacity of a ship power station must be large enough to meet the requirements of high-power electric equipment. However, after the capacity of the ship power station is increased to a certain degree, the busbar current of the conventional AC380V low-voltage power distribution station exceeds the upper safety limit.

In order to reduce the busbar current of the power distribution station on the basis of ensuring enough power station capacity, the voltage of the power station needs to be increased, but the voltage of small and medium-sized loads of a ship is generally civil standard voltage-AC 380V and AC220V, and if the high-voltage electric equipment of the ship with higher voltage is completely used, the cost is greatly increased, and the method is not economical.

Therefore, the marine three-stage distribution power station system is designed, the main busbar voltage of the power station is increased to reduce the main busbar current, and the standard voltages of AC380V and AC220V are provided to supply power for common small-sized electric equipment.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a ship three-stage power distribution station system, the power capacity of the station can meet the power supply requirements of all loads of ships, standard voltage can be provided for common small-sized electric equipment, and the current of a bus bar is in a safety range.

The technical purpose of the utility model is realized by the following technical scheme:

a marine vessel tertiary substation system comprising a primary AC690V distribution panel, a secondary AC380V distribution panel, and a secondary AC220V distribution panel;

the primary AC690V switchboard comprises an AC690V combination starter panel, an AC690V load panel, an AC690V main transformer panel, an AC690V generator panel, an AC690V generator panel, a bow thrust and synchronization panel, an AC690V generator panel and a stern thrust panel;

the first AC690V combined starting panel is connected with a motor with the power consumption of more than 100kW, the first AC690V load panel is connected with electric equipment with the power consumption of more than 100kW, and the first AC690V main transformer panel is connected with a first transformer; the first AC690V generator panel is connected with a first generator, the second AC690V generator panel is connected with a second generator, and the third AC690V generator panel is connected with a third generator; the bow side thruster and the synchronous screen are used for paralleling a first generator, a second generator and a third generator and connecting the generators with a bow side thruster; the stern lateral thrust screen is connected with a stern lateral thruster;

the secondary AC380V panelboard includes a primary AC380V load screen, a primary AC380V main transformer screen; the first AC380V load panel is connected with a 0.75kW-100kW medium-grade load and a first service transformer, and the first AC380V main transformer panel is connected with a first transformer and a 380V deck machine;

the secondary AC220V power distribution panel includes an AC220V load panel, the AC220V load panel connecting a service transformer and a small load having less than 0.75kW of power.

By adopting the technical scheme, the three generator screens are respectively connected with the corresponding generator power supplies and control and protect the corresponding generators, the three generators generate electricity simultaneously, and the bow side push and the synchronization screen combine the first generator, the second generator and the third generator to synchronize the rotating speeds of the three generators. The first AC690V combined starting panel is used for starting control of a motor with the power being more than 100kW, the first AC690V load panel is used for supplying power to electric equipment with the power being more than 100kW, the bow thrusting and synchronizing panel supplies power to a bow lateral thruster, the stern lateral thrusting panel supplies power to a stern lateral thruster, and the first AC690V main transformer panel supplies power to a secondary AC380V distribution panel through a first transformer. The primary AC380V main transformer panel is used for receiving primary transformer power, the primary AC380V load panel supplies power for middle-level loads with power larger than 0.75kW and smaller than 100kW, such as pumps, fans and the like, and the primary AC380V load panel supplies power for the AC220V load panel of the secondary AC220V distribution board through the primary service transformer. The AC220V load panel is used for supplying power to small loads such as small motors, lamps and the like with the power less than 0.75 kW.

The utility model forms three-stage power distribution by arranging a primary AC690V power distribution board, a secondary AC380V power distribution board and a secondary AC220V power distribution board, wherein the power distribution voltage comprises three stages of AC690V, AC380V and AC220V, the AC690V voltage is used for supplying power to a large load with the power exceeding 100kW, the AC380V voltage is used for supplying power to a medium load with the power between 0.75kW and 100kW, and the AC220V voltage is used for supplying power to a small load with the power less than 0.75 kW. The power capacity of the power station is 6450kW, the power supply requirements of all loads of a ship can be met, the current of a primary AC690V bus bar is less than 5000A, the current of a secondary AC380V bus bar is less than 1600A, and the current of a secondary AC220V bus bar is less than 300A, and the current does not exceed the upper limit 8000A of the bus safety current.

Further, the primary AC690V distribution panel also includes a No. two AC690V combination start screen, a No. two AC690V load screen, a No. two AC690V main transformer screen; the second AC690V combined starting screen is connected with a motor with the power of more than 100kW, and forms mutual standby with the first AC690V combined starting screen; the second AC690V load screen is connected with electric equipment with the power consumption of more than 100kW, and forms mutual standby with the first AC690V load screen; the second AC690V main transformer panel is connected with a second transformer, and the second transformer is connected with a secondary AC380V distribution board.

By adopting the technical scheme, the second AC690V combined starting panel is used for starting control of the motor with the power of more than 100kW, and the combined starting panel and the first AC690V combined starting panel form mutual backup so as to prevent the starter from being completely unavailable due to failure on one side. The second AC690V load panel is used to supply power to electrical equipment above 100kW and is in backup relation to the first AC690V load panel in case of a side failure resulting in the primary AC690V panel being completely unpowered. The second AC690V main transformer panel supplies power to the secondary AC380V distribution board through the second transformer, and is mutually standby with the first transformer.

Further, the secondary AC380V panelboard also includes a No. two AC380V load screen, a No. two AC380V main transformer screen; the second AC380V load screen is connected with a 0.75kW-100kW medium-grade load and a second service transformer, and forms mutual standby with the first AC380V load screen; the second AC380V main transformer screen is connected with a second transformer and a 380V deck machine; the service transformer number two is connected to the AC220V load panel and is interlocked with the service transformer number one at the AC220V load panel.

By adopting the technical scheme, the second AC380V load panel is used for supplying power to the middle-level loads such as pumps and fans with the power more than 0.75kW and less than 100kW, and the second AC380V load panel and the first AC380V load panel are mutually standby to prevent one side from being failed, so that the secondary AC380V distribution panel cannot supply power at all. No. two AC380V main transformer screens are used for receiving No. two transformer power. The first service transformer and the second service transformer are interlocked at the AC220V load screen, when one side loses power, the other side supplies power, and the AC220V load screen is ensured to normally supply power for a small load with the power less than 0.75 kW.

Further, the secondary AC380V panelboard also includes a busbar panel, where the first AC380V main transformer panel and the second AC380V main transformer panel interlock.

By adopting the technical scheme, the bus bar screen is used for isolating the bus bars on two sides of the AC380V, when one side of the first AC380V main transformer screen or the second AC380V main transformer screen loses power, the other side of the first AC380V main transformer screen or the second AC380V main transformer screen can be connected through the bus bar switch, and the power supply of the secondary AC380V distribution board is recovered.

Furthermore, the busbar panel is also connected with a shore power connection box, and the shore power connection box, the first AC380V main transformer panel and the second AC380V main transformer panel are interlocked on the busbar panel.

By adopting the technical scheme, when the primary AC380V main transformer panel and the secondary AC380V main transformer panel lose power, the power supply of the shore power connection box can be led in through the bus switch connection so as to recover the power supply of the secondary AC380V distribution board.

Further, the secondary AC380V panelboard also includes an emergency generator panel and an emergency AC380V load panel, the emergency generator panel connecting the second AC380V load panel and the emergency generator, the emergency generator and the second AC380V load panel interlocking at the emergency generator panel; the emergency AC380V load screen is connected with an AC380V middle-level emergency load.

By adopting the technical scheme, the second AC380V load screen supplies power for the emergency generator screen in a normal state, and further supplies power for the AC380V middle-level emergency load through the emergency AC380V load screen. When the second AC380V load panel loses power, the emergency generator supplies power to the emergency generator panel, and the AC380V middle-level emergency load is guaranteed to be available.

Further, the secondary AC220V distribution board further comprises an AC220V emergency load screen, the emergency AC380V load screen is connected with an emergency transformer, and the AC220V emergency load screen is connected with the emergency transformer and an AC220V small emergency load.

By adopting the technical scheme, the emergency AC380V load screen is an AC220V emergency load screen through a first emergency transformer, and the AC220V emergency load screen supplies power for an AC220V small-sized emergency load.

Further, an emergency transformer II is connected to the emergency AC380V load screen, is connected with the AC220V emergency load screen, and is interlocked with the emergency transformer I at the AC220V emergency load screen.

Through adopting above-mentioned technical scheme, emergent transformer and No. two emergent transformer interlocks, and the another side supplies power when losing the power on one side, guarantees that AC220V emergency load screen can normally be the power supply of the small-size emergency load of AC 220V.

In conclusion, the utility model has the following beneficial effects:

1. the utility model forms three-stage power distribution by arranging a primary AC690V power distribution board, a secondary AC380V power distribution board and a secondary AC220V power distribution board, wherein the power distribution voltage comprises three stages of AC690V, AC380V and AC220V, the AC690V voltage is used for supplying power to a large load with the power exceeding 100kW, the AC380V voltage is used for supplying power to a medium load with the power between 0.75kW and 100kW, and the AC220V voltage is used for supplying power to a small load with the power less than 0.75 kW;

2. the power capacity of the power station is 6450kW, the power supply requirements of all loads of a ship can be met, the current of a primary AC690V bus bar is less than 5000A, the current of a secondary AC380V bus bar is less than 1600A, and the current of a secondary AC220V bus bar is less than 300A and does not exceed the upper limit 8000A of the bus safety current;

3. two sets of transformers and two sets of load screens are arranged between every two secondary sides, and emergency power supplies are further arranged, so that emergency situations are effectively prevented, and normal use of a power distribution system is guaranteed as far as possible.

Drawings

Fig. 1 is a schematic diagram of a marine three-stage substation system.

In the figure, 1, a primary AC690V electrical panel; 11. a first AC690V combination start screen; 12. AC690V load screen No. one; 13. AC690V main transformer screen; 14. AC690V generator panel number one; 15. AC690V generator panel No. two; 16. bow thrusting and synchronizing screen; 17. AC690V generator panel No. three; 18. a stern lateral pushing screen; 19. AC690V main transformer panel No. two; 110. AC690V load screen No. two; 111. second AC690V combination start screen; 2. a secondary AC380V switchboard; 21. a first AC380V load screen; 22. AC380V Main Transformer Screen No; 23. a bus bar screen; 24. AC380V Main Transformer Screen No; 25. AC380V load screen No. two; 26. an emergency generator panel; 27. emergency AC380V load screen; 3. secondary AC220V switchboard; 31. an AC220V load screen; 32. an AC220V emergency load screen; 4. a motor with a power of more than 100 kW; 41. electric equipment with power consumption above 100 kW; 42. a first transformer; 43. a first generator; 44. a second generator; 45. a third generator; 46. a bow lateral thruster; 47. a stern lateral thruster; 48. a second transformer; 5. a medium-level load; 51. a service transformer; 52. 380V deck machinery; 53. a shore power connection box; 54. a second service transformer; 55. an emergency generator; 56. AC380V medium emergency loads; 57. a first emergency transformer; 58. a second emergency transformer; 6. a small load; 61. AC220V small emergency loads.

Detailed Description

The present invention will be described in further detail with reference to the following drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.

A marine vessel tertiary substation system, as shown in fig. 1, comprises a primary AC690V distribution panel 1, a secondary AC380V distribution panel 2 and a secondary AC220V distribution panel 3, the tertiary panels each comprising a number of functional sub-panels.

As shown in fig. 1, the primary AC690V electrical panel 1 specifically includes:

the first AC690V combined starting screen 11 is connected with the motor 4 with the power of more than 100kW and is used for starting control of the motor 4 with the power of more than 100 kW;

the first AC690V load panel 12 is connected with the electric equipment 41 with the power consumption of more than 100kW and is used for supplying power to the electric equipment 41 with the power consumption of more than 100 kW;

the primary AC690V main transformer panel 13 is connected with the primary transformer 42 and supplies power to the secondary AC380V distribution board 2 through the primary transformer 42;

the first AC690V generator panel 14 is connected with the first generator 43, is connected with the power supply of the first generator 43, and controls and protects the first generator 43;

the second AC690V generator panel 15 is connected with the second generator 44, is connected with the power supply of the second generator 44, and controls and protects the second generator 44;

the third AC690V generator panel 17 is connected with the third generator 45, is connected with the power supply of the third generator 45, and controls and protects the third generator 45;

the bow thrusting and synchronizing screen 16 parallels the first generator 43, the second generator 44 and the third generator 45 to synchronize the rotating speeds of the three generators; and is connected with the bow lateral thruster 46 to supply power to the bow lateral thruster 46;

a stern lateral thruster 47 connected to the stern lateral thruster 18 to supply power to the stern lateral thruster 47;

the second AC690V main transformer panel 19 is connected with the second transformer 48, supplies power to the secondary AC380V distribution board 2 through the second transformer 48, and is mutually standby with the first transformer 42;

the second AC690V load panel 110 is connected with the electric equipment 41 with the power consumption of more than 100kW and is mutually standby with the first AC690V load panel 12 to prevent a fault from occurring at one side, so that the primary AC690V distribution board 1 cannot supply power at all;

the combined starter panel 111 of AC690V, connected to the motor 4 above 100kW, is in backup relation to the combined starter panel 11 of AC690V in case of a failure at one side and the starter is completely unusable.

The AC690V voltage of the primary AC690V switchboard 1 is used to power large loads with power in excess of 100kW and the AC690V voltage is converted to AC380V voltage by a first/ second transformer 42, 48 for use by the secondary AC380V switchboard 2. Wherein, start screen, load screen and transformer screen all are equipped with two sets ofly, and mutual reserve avoids influencing the power supply when breaking down.

As shown in fig. 1, the secondary AC380V electrical panel 2 specifically includes:

the first AC380V load screen 21 is connected with a 0.75kW-100kW medium-grade load 5 and supplies power for the medium-grade load 5 with power more than 0.75kW and less than 100kW, such as a pump, a fan and the like; connecting a service transformer No. one 51, converting the AC380V voltage into the AC220V voltage through the service transformer No. one 51, and supplying the AC220V power distribution board 3 with the secondary level;

the primary AC380V transformer panel 22 is connected with the primary transformer 42 and is used for receiving the AC380V voltage converted by the primary transformer 42; the 380V deck machinery 52 is connected to supply power to the 380V deck machinery 52;

the second AC380V main transformer panel 24 is connected with the second transformer 48 and is used for receiving the AC380V voltage converted by the second transformer 48; the 380V deck machinery 52 is connected to supply power to the 380V deck machinery 52;

the second AC380V load screen 25 is connected with a 0.75kW-100kW medium-grade load 5 and supplies power for the medium-grade load 5 with power more than 0.75kW and less than 100kW, such as a pump, a fan and the like; connecting a second service transformer 54, converting the AC380V voltage into AC220V voltage through the second service transformer 54, and supplying the AC220V power distribution board 3 with secondary level; the second AC380V load panel 25 and the first AC380V load panel 21 are in backup with each other to prevent a failure on one side, which results in the complete failure of the secondary AC380V switchboard 2;

the busbar panel 23 is connected with a shore power connection box 53, and the shore power connection box 53, the first AC380V main transformer panel 22 and the second AC380V main transformer panel 24 are interlocked on the busbar panel 23; when power is lost on one side of the primary AC380V or secondary AC380V main transformer panels 22, 24, the other side of the power can be brought in through the bus switch connection to restore power to the secondary AC380V switchboard 2; when power is lost to both AC380V primary transformer panel No. 22 and AC380V primary transformer panel No. 24, power from shore power connection box 53 may be brought in through the bus switch connection to restore power to secondary AC380V switchboard 2.

The AC380V voltage of the secondary AC380V switchboard 2 is used to power medium-sized loads with power between 0.75kW and 100kW and converts the AC380V voltage to AC220V voltage through the first service transformer 51/second service transformer 54 for use by the secondary AC220V switchboard 3. The starting screen, the load screen and the service transformer screen are respectively provided with two groups which are mutually standby, so that the influence on power supply when a fault occurs is avoided.

As shown in fig. 1, the secondary AC220V electrical panel 3 specifically includes:

the AC220V load panel 31, AC220V load panel 31 connect No. one service transformer 51, No. two service transformer 54, No. one service transformer 51 and No. two service transformer 54 interlock at AC220V load panel 31, when the power is lost on one side, the other side supplies power, guarantee that AC220V load panel 31 can normally supply power for the small load 6 that power is less than 0.75 kW. The AC220V load panel 31 is also connected with a small load 6 with power less than 0.75kW and is used for supplying power to the small load 6 such as a small motor, a lamp and the like with power less than 0.75 kW.

Emergency:

as shown in FIG. 1, the secondary AC380V electrical panel 2 further includes：

An emergency generator panel 26, connecting the second AC380V load panel 25 and the emergency generator 55, and the emergency generator 55 and the second AC380V load panel 25 are interlocked at the emergency generator panel 26. Normally, the second AC380V load panel 25 supplies power to the emergency generator panel 26, and further supplies power to the AC380V middle-level emergency load 56 through the emergency AC380V load panel 27. When the load panel 25 of the second AC380V loses power, the emergency generator 55 supplies power to the emergency generator panel 26, and the medium-grade emergency load 56 of the AC380V is guaranteed to be available.

The emergency AC380V load screen 27 is connected with the AC380V middle-level emergency load 56 and supplies power to the AC380V middle-level emergency load 56; the first emergency transformer 57 and the second emergency transformer 58 are connected, and the AC380V emergency voltage is converted into the AC220V voltage through the first emergency transformer 57 or the second emergency transformer 58 to be used by the AC220V emergency load screen 32.

As shown in FIG. 1, secondary AC220V power panel 3 also includesThe AC220V emergency load panel 32 and the emergency AC380V load panel 27 are connected with a first emergency transformer 57 and a second emergency transformer 58, the first emergency transformer 57 and the second emergency transformer 58 are interlocked on the AC220V emergency load panel 32, when power is lost on one side, power is supplied on the other side, and the AC220V emergency load panel 32 is guaranteed to be capable of normally supplying power to an AC220V small emergency load 61. The AC220V emergency load screen 32 is also connected to an AC220V small emergency load 61 to power the AC220V small emergency load 61.

When the primary AC690V distribution board 1 is damaged and not powered, the emergency generator 55 operates to supply power to the AC380V medium emergency loads 56 and to the AC220V small emergency loads 61 for emergency purposes.

The working principle and the using method of the utility model are as follows:

the utility model forms three-stage power distribution by arranging a primary AC690V power distribution board 1, a secondary AC380V power distribution board 2 and a secondary AC220V power distribution board 3, wherein the power distribution voltage comprises three stages of AC690V, AC380V and AC220V, the AC690V voltage is used for supplying power to a large load with the power exceeding 100kW, the AC380V voltage is used for supplying power to a medium load 5 with the power between 0.75kW and 100kW, and the AC220V voltage is used for supplying power to a small load 6 with the power less than 0.75 kW. The power capacity of the power station is 6450kW, the power supply requirements of all loads of a ship can be met, the current of a primary AC690V bus bar is less than 5000A, the current of a secondary AC380V bus bar is less than 1600A, and the current of a secondary AC220V bus bar is less than 300A, and the current does not exceed the upper limit 8000A of the bus safety current. The starting screen, the load screen, the main transformer screen, the transformer and the service transformer on the three-level distribution board are provided with two groups of mutual standby, and the shore power connection box 53 and the emergency generator 55 are further arranged, so that emergency is effectively prevented, the complete breakdown of the whole distribution system is avoided as much as possible, and the normal use of the distribution system is ensured as much as possible.

While the foregoing description shows and describes the preferred embodiments of the present invention, it is to be understood that the utility model is not limited to the forms disclosed herein, but is not intended to be exhaustive or to exclude other embodiments and may be used in various other combinations, modifications, and environments and is capable of changes within the scope of the inventive concept as expressed herein, commensurate with the above teachings, or the skill or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the utility model as defined by the appended claims.

Claims (8)

1. The utility model provides a three-level distribution power station system of boats and ships which characterized in that: comprises a primary AC690V distribution board (1), a secondary AC380V distribution board (2), and a secondary AC220V distribution board (3);

the primary AC690V switchboard (1) comprises a first AC690V combination starter panel (11), a first AC690V load panel (12), a first AC690V main transformer panel (13), a first AC690V generator panel (14), a second AC690V generator panel (15), a bow thrust and synchronization panel (16), a third AC690V generator panel (17) and a stern thrust panel (18);

the primary AC690V combined starting panel (11) is connected with a motor (4) with more than 100kW, the primary AC690V load panel (12) is connected with an electric device (41) with more than 100kW, and the primary AC690V main transformer panel (13) is connected with a primary transformer (42); the first AC690V generator panel (14) is connected with a first generator (43), the second AC690V generator panel (15) is connected with a second generator (44), and the third AC690V generator panel (17) is connected with a third generator (45); the bow side push and synchronization screen (16) parallels a first generator (43), a second generator (44) and a third generator (45) and is connected with a bow side propeller (46); the stern lateral thrust screen (18) is connected with a stern lateral thruster (47);

the secondary AC380V panelboard (2) includes a No. one AC380V load panel (21), a No. one AC380V main transformer panel (22); the primary AC380V load panel (21) is connected with a 0.75kW-100kW medium-grade load (5) and a primary service transformer (51), and the primary AC380V main transformer panel (22) is connected with a primary transformer (42) and a 380V deck machine (52);

the secondary AC220V power distribution panel (3) includes an AC220V load panel (31), the AC220V load panel (31) connecting a service transformer (51) and a small load (6) having less than 0.75kW of power.

2. The marine tertiary electrical distribution plant system of claim 1, wherein: the primary AC690V distribution panel (1) further comprises a No. two AC690V combination starter panel (111), a No. two AC690V load panel (110), a No. two AC690V main transformer panel (19); the second AC690V combined starting screen (111) is connected with a motor (4) with the power of more than 100kW and forms a mutual standby with the first AC690V combined starting screen (11); the second AC690V load screen (110) is connected with an electric device (41) with the power consumption of more than 100kW and forms a mutual standby with the first AC690V load screen (12); the second AC690V main transformer panel (19) is connected with a second transformer (48), and the second transformer is connected with a secondary AC380V switchboard (2).

3. The marine tertiary electrical distribution plant system of claim 2, wherein: the secondary AC380V panelboard (2) further includes a No. two AC380V load panel (25), a No. two AC380V main transformer panel (24); the second AC380V load screen (25) is connected with a 0.75kW-100kW medium-grade load (5) and a second service transformer (54) and forms a mutual standby with the first AC380V load screen (21); the second AC380V main transformer screen (24) is connected with a second transformer (48) and a 380V deck machine (52); the second service transformer (54) is connected with the AC220V load screen (31) and is interlocked with the first service transformer (51) at the AC220V load screen (31).

4. The marine tertiary electrical distribution plant system of claim 3, wherein: the secondary AC380V panelboard (2) further includes a busbar panel (23), the first AC380V main transformer panel (22) and the second AC380V main transformer panel (24) being interlocked at the busbar panel (23).

5. The marine tertiary electrical distribution plant system of claim 4, wherein: the busbar screen (23) is further connected with a shore power connection box (53), and the shore power connection box (53), the first AC380V main transformer screen (22) and the second AC380V main transformer screen (24) are interlocked on the busbar screen (23).

6. The marine tertiary electrical distribution plant system of claim 5, wherein: the secondary AC380V switchboard (2) further comprises an emergency generator panel (26) and an emergency AC380V load panel (27), the emergency generator panel (26) connecting the second AC380V load panel (25) and the emergency generator (55), the emergency generator (55) and the second AC380V load panel (25) being interlocked at the emergency generator panel (26); the emergency AC380V load screen (27) is connected with an AC380V middle-level emergency load (56).

7. The marine tertiary electrical distribution plant system of claim 6, wherein: the secondary AC220V distribution board (3) further comprises an AC220V emergency load screen (32), a first emergency transformer (57) is connected to the emergency AC380V load screen (27), and a first emergency transformer (57) and an AC220V small emergency load (61) are connected to the AC220V emergency load screen (32).

8. The marine tertiary electrical distribution plant system of claim 7, wherein: the emergency AC380V load screen (27) is also connected with a second emergency transformer (58), and the second emergency transformer (58) is connected with an AC220V emergency load screen (32) and is interlocked with the first emergency transformer (57) at an AC220V emergency load screen (32).

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