A marine medium-voltage DC power distribution device based on a water-cooled solid-state circuit breaker

Abstract

This invention relates to a marine medium-voltage DC power distribution device based on a water-cooled solid-state circuit breaker. The top of the cabinet is equipped with pressure relief plates for arc relief channels in the circuit breaker compartment, busbar compartment, and cable compartment. The circuit breaker compartment houses a power electronic switch valve string unit; the diode valve string compartment and IGBT valve string compartment in the power electronic switch valve string unit are connected. The instrument compartment in the upper part of the cabinet houses secondary terminal blocks, circuit breakers, controllers, relays, integrated relay protection devices, fiber optic current transformer junction boxes, electromagnetic locks, and voltage transformers in the cable compartment. The cable compartment includes external copper busbars, current transformers, and voltage transformers. A live display device, voltage transformers, and current transformers are mounted on the busbars. The busbar compartment houses the main busbar and branch busbars. The main busbar connects each functional panel, and each functional panel uses a separate bus tie panel. This design reduces the space volume of the ship's main switchboard while fulfilling the measurement and protection functions of the medium-voltage DC power distribution device's bus tie panel.

Description

Technical Field

[0001] This invention relates to a marine medium-voltage DC power distribution device, and more particularly to a power distribution device suitable for transmitting, distributing and protecting electrical energy in a 10kV medium-voltage DC integrated electric propulsion system. Background Technology

[0002] In DC integrated power systems based on permanent magnet synchronous generators (PMSG) and controlled rectifier technology, the high voltage level, large system capacity, low line impedance, and numerous energy storage components result in extremely high short-circuit current rise rates and peak currents during inter-pole short-circuit faults. According to system protection analysis, to address the challenges of rapid and selective fault protection in DC systems, solid-state circuit breakers are required as protection devices in medium-voltage DC power distribution units. This invention relates to a marine medium-voltage DC power distribution unit based on a water-cooled solid-state circuit breaker, applicable to the PMSG + controlled rectifier technology route. Marine medium-voltage DC power distribution units are a crucial development direction in the field of power plant equipment for large ships and offshore platforms in China, and are also a bottleneck restricting the development of these marine development facilities. Developing marine medium-voltage power distribution units with independent intellectual property rights is of great significance.

[0003] The existing medium-voltage power distribution equipment design has the following problems:

[0004] (1) Currently, large ship power stations generally adopt a ring network power supply method with multiple power stations. Under most operating conditions, multiple power stations need to be operated in parallel. Medium and high voltage power stations are generally equipped with bus tie panels (bridging panels) and measurement panels. The bus tie panel busbar room is equipped with the main busbar, which serves to connect the various functional panels. The measurement panel is equipped with current transformers, voltage transformers, etc., which serve to measure and protect. Due to the large number of equipment on large ships and the limited internal cabin space, the bus tie panel and measurement panel occupy a lot of space, which brings great inconvenience to the overall layout of the ship.

[0005] (2) At present, the interlocking device of marine medium voltage power distribution equipment is cumbersome to operate, the interlocking procedure is not clear enough, and the reliability of its interlocking method is questionable.

[0006] (3) Currently, the instrument room of marine medium-voltage power distribution equipment has limited space and many components, and the internal layout is relatively dense, which is not conducive to secondary cable wiring, the control circuit wiring is complicated, debugging and maintenance are inconvenient, and the risk of accidents is easy to occur, reducing its reliability.

[0007] To address the aforementioned issues: 1) Considering the limited space in the main power distribution room of large ships, and in special circumstances where measuring panels cannot be installed, this invention allows for the installation of busbar grounding switches or voltage transformers in the busbar room of the medium-voltage DC power distribution device, based on the actual project requirements. To ensure electrical safety, the design of the busbar voltage transformers or busbar grounding switches is made to meet the requirements for electrical clearance and creepage distance in the specifications for busbar rooms. Mechanical and electrical interlocking methods can be used to ensure electrical safety during the operation of the busbar grounding switch; 2) Interlocking devices such as busbar room grounding switch operation interlocking devices, handcart room interlocking devices, and cable room door and grounding switch operation interlocking devices are used to provide a safe working environment for operators; 3) The instrument room of the marine medium-voltage power distribution device in this patent adopts an independent, modular design, which not only increases space but also allows for adjustment of the internal layout of the module according to actual project requirements, facilitating the wiring of secondary cables and instruments, and providing a reliable power supply design.

[0008] This invention provides a solution for a relatively smaller medium-voltage DC power distribution device while fulfilling the required functions of a marine medium-voltage DC power distribution device. This effectively saves cabin space and solves problems such as the spatial arrangement of high-power medium-voltage DC power distribution boards. Summary of the Invention

[0009] The present invention provides a marine medium-voltage DC power distribution device based on a water-cooled solid-state circuit breaker, which is mainly used in large ships and marine engineering ship power stations. While meeting the requirements of rapid protection and selectivity of marine medium-voltage power distribution devices, it adopts an optimized cabinet structure design, which makes it compact, small-volume, and modular, which can effectively reduce volume, reduce cost, and improve the utilization rate of limited space on ships.

[0010] To achieve the above objectives, the technical solution of the present invention is: a marine medium-voltage DC power distribution device based on a water-cooled solid-state circuit breaker, comprising a cabinet, a circuit breaker compartment, an instrument compartment, a cable compartment, and a busbar compartment. The top of the cabinet is provided with pressure relief plates for the internal arc relief channels of the circuit breaker compartment, busbar compartment, and cable compartment. The circuit breaker compartment is equipped with a power electronic switch valve string unit. The power electronic switch valve string unit includes an IGBT valve string compartment, a diode valve string compartment, an isolation transformer, an electric isolating handcart, and pressure relief channels. The diode valve string compartment and the IGBT valve string compartment are connected. The instrument compartment in the upper part of the cabinet is equipped with secondary terminal blocks, circuit breakers, controllers, relays, integrated relay protection devices, and fiber optic cables. The system includes a current transformer junction box, electromagnetic lock, voltage transformer in the cable compartment, mounting bracket for the zero-sequence current transformer, grounding connection bar, and operating switches, a live indicator, and on / off status indicator lights on the secondary terminal blocks. The cable compartment contains external cable copper busbars, current transformers, and voltage transformers. The live indicator, voltage transformer, and current transformer are mounted on the busbar. The busbar connects the busbar side and the cable side, and a grounding switch is installed on the cable side. The busbar compartment houses the main busbar and branch busbars. The main busbar connects each functional panel, and each functional panel uses a separate bus tie panel. This design reduces the space required for the ship's main switchboard while fulfilling the measurement and protection functions of the medium-voltage DC power distribution device bus tie panel.

[0011] Furthermore, the power electronic switch valve string unit is combined with the electrical interlocking of the electric handcart disconnector, the mechanical interlocking of the electric handcart disconnector and the grounding switch, the mechanical interlocking of the grounding switch and the rear door of the cable compartment, the electromagnetic locks of the front and rear doors of the circuit breaker cabinet, and the mechanical and electromagnetic locks of the cable compartment door.

[0012] Furthermore, the pressure relief channel is directed towards the top of the cabinet, and the pressure relief window is a rectangular metal top plate, fixed on one side with a hinge and on the other side with nylon screws; when a malfunction occurs inside the cabinet, the top rectangular metal plate deforms and opens to release pressure and vent gas.

[0013] Furthermore, the main busbar uses rectangular busbars and D-shaped busbars to connect the various functional panels.

[0014] Furthermore, each function panel has a switchboard with a circuit breaker button, a test light button, a reset button, a live indicator, an ammeter and a changeover switch, and a position status indicator.

[0015] Furthermore, the marine medium-voltage DC power distribution unit is equipped with a comprehensive protection device to protect the busbars and cables; an ammeter is installed to detect the bus tie current; and the opening and closing operations of the bus tie panel circuit breaker are performed via the opening and closing buttons on the panel.

[0016] Furthermore, the bottom of the cable compartment has an opening for external cables to enter, and there are designated locations inside for installing cable heads; the cross-section of the conductors connecting the high-voltage components and cable heads inside the cable compartment, in addition to meeting the rated current specified on the nameplate, along with the supporting insulators, can withstand the rated peak withstand current, rated short-time withstand current, and rated short-time duration specified on the high-voltage switchgear nameplate; the connection between the cable compartment and the cable trench is protected with cable mud to prevent small animals from entering.

[0017] Furthermore, in special cases where it is impossible to install a measuring panel, a busbar grounding switch and a voltage transformer are installed in the busbar compartment. The installation of the busbar grounding switch or voltage transformer meets the requirements for electrical clearance and creepage distance in the busbar compartment to ensure electrical safety performance.

[0018] Furthermore, the bottom of the cabinet is equipped with channel steel and shock absorbers. The channel steel is connected to the grounding connection bar and shares the ground with the hull through the connection bar.

[0019] The present invention has the following beneficial effects:

[0020] 1. The marine medium-voltage DC power distribution device of the present invention has a separate bus tie panel (bridging panel). While performing the measurement and protection functions of the bus tie panel (bridging panel) of the medium-voltage DC power distribution device, it can reduce the space volume of the ship's main switchboard and improve the space utilization rate of the ship's main switchboard room in the case of limited space in large ships and marine engineering vessels.

[0021] 2. The instrument room of the marine medium-voltage DC power distribution device in this invention adopts an independent and modular design. Control modules such as the energy management system can be installed in this room. When necessary, protective measures can be taken, and while ensuring the electrical clearance and creepage distance between the front and lower chambers of the cable room, terminal blocks and components can be arranged for secondary wiring. This can improve the space utilization efficiency of the cabinet instrument room, save certain costs, and the module layout can be flexibly adjusted according to the actual project requirements. It has the advantages of convenient wiring, simple control circuit, convenient maintenance, reduced accident risk, and improved reliability.

[0022] 3. The marine medium-voltage DC power distribution device of this invention adopts a combination of electrical interlocking between the circuit breaker and the electric handcart disconnector, mechanical interlocking between the electric handcart disconnector and the grounding switch, mechanical interlocking between the grounding switch and the rear door of the cable compartment, electromagnetic locks for the front and rear doors of the circuit breaker cabinet, and mechanical and electromagnetic locks for the cable compartment door. Based on the special characteristics of the marine medium-voltage power distribution device for large offshore platforms, it reflects the requirements for operator safety and the requirements for safe operation of the power grid. The design of its interlocking device is simple and reliable in operation, with clear interlocking procedures and comprehensive interlocking functions.

[0023] This invention employs an optimized cabinet structure design. Considering the limited space in the main power distribution panel room of large ships, where measuring panels cannot be installed, a busbar grounding switch and voltage transformer can be added to the busbar room of the medium-voltage power distribution device. To ensure electrical safety, the design of the busbar grounding switch fully considers the requirements for electrical clearance and creepage distance in the busbar room. Operationally, a combination of mechanical and electrical interlocks ensures electrical safety during the operation of the busbar grounding switch. This reduces the overall size of the marine medium-voltage DC power distribution device, lowers costs, and makes full use of the limited space on large ships and marine engineering vessels. The independent, modular design of the marine medium-voltage power distribution device instrument room of this invention facilitates factory wiring, simplifies circuitry, facilitates maintenance, reduces accident risks, and improves reliability. Furthermore, the design of its cabinet mechanical interlock device ensures simple and reliable operation, clear interlocking procedures, and comprehensive interlocking functions, maximizing the safety of personnel. Attached Figure Description

[0024] Figure 1 This is a front view of the marine medium-voltage power distribution device of the present invention;

[0025] Figure 2 This is a left view of the structure of the marine medium-voltage power distribution device of the present invention;

[0026] Figure 3 yes Figure 1 Sectional view of AA;

[0027] Figure 4 yes Figure 1 Sectional view of BB;

[0028] Figure 5 This is a three-dimensional structural view of the marine medium-voltage power distribution device of the present invention;

[0029] Figure 6 This is the electrical schematic diagram of the marine medium-voltage power distribution device of the present invention. Detailed Implementation

[0030] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0031] like Figures 1 to 6 As shown, the marine medium-voltage power distribution device of the present invention includes a solid-state circuit breaker 1, an incoming / outgoing line cabinet 2, a circuit breaker cabinet 3, an integrated relay protection device 4, a current transformer 5, a pre-charge resistor 6, a bypass switch 7, a secondary plug socket 8, a busbar assembly 9, a diode valve string trolley 10, an insulating support 11, an IGBT valve string trolley 12, a wall bushing 13, a water pipe assembly 14, an electric handcart disconnect switch 15, a live indicator 16, a voltage transformer 17, a grounding switch 18, and a nameplate 19.

[0032] The marine medium-voltage DC power distribution device of the present invention is mainly divided into a circuit breaker compartment, a cable compartment, a busbar compartment, and an instrument compartment. Its internal components mainly include solid-state DC circuit breakers, main busbars, power supply branch busbars, live display 16, busbar compartment grounding switch, digital integrated relay protection device, cable compartment grounding switch, voltage sensor 17, fiber optic current transformer, and other components.

[0033] The medium-voltage DC power distribution unit has a DC busbar, an electric isolating handcart, and an instrument room at the top, and a power electronic switch valve string unit at the bottom. The busbar side and the cable side are connected through a busbar, a diode valve string unit, and an IGBT valve string unit. A voltage transformer 17, a current transformer 5, and a live display device 16 are installed on the busbar. A grounding switch 18 is installed on the cable side.

[0034] The circuit breaker compartment includes a power electronic switch valve string unit, an isolation transformer, and an electric isolating trolley. The busbar compartment houses two busbars, one positive and one negative, with intermittent connections between the copper busbars for heat dissipation. The size and strength of the busbars installed in the busbar compartment must meet certain dynamic and thermal stability requirements, and additional supporting insulators are added to secure the copper busbars and ensure installation strength. All copper busbars are rigidly connected. The instrument compartment mainly includes secondary terminal blocks, circuit breakers, controllers, relays, integrated relay protection device 4, and fiber optic current transformer junction boxes. The secondary compartment door panel is equipped with operating switches, a live indicator 16, and on / off status indicator lights. The cable compartment contains external cable copper busbars, current transformers 5, and voltage transformers 17. An opening at the bottom of the cable compartment allows for the entry of external cables, and the compartment also has designated locations for installing cable heads, with reliable fixing methods and components considered. In addition to meeting the rated current specified on the nameplate, the cross-section of the conductors connecting the high-voltage components and cable heads in the compartment, together with the supporting insulators, can withstand the rated peak withstand current, rated short-time withstand current, and rated short-time duration specified on the nameplate of the high-voltage switchgear; sufficient space is reserved at the installation position of the cable head to facilitate disconnection and connection during maintenance and testing; cable mud is used to protect the connection between the cable compartment and the cable trench to prevent small animals from entering.

[0035] The top of the cabinet is equipped with three pressure relief plates, each providing a pressure relief channel for the electric arc inside the circuit breaker compartment, busbar compartment, and cable compartment. The pressure relief direction is towards the top of the cabinet, and the pressure relief window is a rectangular metal top plate, fixed on one side with a hinge and on the other side with nylon screws. When a fault occurs inside the cabinet, the top plate deforms and opens, releasing pressure and venting gas. After pressure relief, the top plate is unusable and must be replaced before it can be put back into operation.

[0036] The distribution panel is equipped with open / close buttons, test light buttons, reset buttons, a live indicator, ammeters and changeover switches, and position status indicators. It features a comprehensive protection device to protect the busbars and cables; an ammeter to detect the bus tie (bridging) current; and the ability to open and close the bus tie (bridging) circuit breaker via the open / close buttons on the panel. If the busbar is energized, the bus tie switch cannot be closed; it can only be closed when the busbar is de-energized (considering the interlocking of the busbar grounding switch; for example, if the bus tie grounding switch is closed, the bus tie (bridging) circuit breaker cannot be closed). The busbar live indicator on the panel shows the busbar's energization status. Indicators show the position, operation, and grounding switch status of the bridging circuit breaker. A temperature and humidity controller enables automatic temperature control of the circuit breaker compartment and cable compartment. In remote control mode, the PMS controls the bus tie (bridging) circuit breaker. The main switch cannot be opened or closed on the medium-voltage distribution board.

[0037] The bottom of the cabinet is equipped with channel steel, shock absorbers and other installation methods. The channel steel is connected to the grounding connection bar and shares the ground with the hull through the connection bar.

[0038] For 10kV marine medium-voltage DC power distribution equipment, based on arc simulation calculations, the high-stress areas caused by arcing are mainly distributed on the edges. Chamfering is applied to the edges of high-stress distribution areas in each chamber, effectively widening the narrow areas and reducing the stress caused by gas expansion on the cabinet.

[0039] The DC power distribution unit adopts water cooling. Water-cooled inlet and outlet manifolds are installed at the lower right position of each IGBT valve string. The manifolds are made of materials such as PVDF membrane. Before the trolley enters the cabinet, the inlet and outlet water pipes on all valve strings must be connected to the manifold. After entering the cabinet, the manifold is connected to the bottom main pipe for easy inspection and maintenance in the future.

[0040] The main technical specifications of the DC power distribution device proposed in this invention include: rated voltage DC 10kV; rated current 5kA; bus tie switch breaking capacity ≥100kA (expected short-circuit current); main circuit withstand voltage 35kV / 1min; main circuit impulse withstand voltage 95kV (1.2 / 50μs).

[0041] Functions of each compartment in the marine medium-voltage power distribution device of the present invention:

[0042] The bottom of the cable compartment has an opening for cable entry and connection. The cable compartment door can only be opened after the grounding switch is closed. The cable compartment door is equipped with an electromagnetic lock, preventing it from opening when power is on. The circuit breaker and the electric trolley disconnect switch are electrically interlocked; the disconnect switch can only be operated after the circuit breaker is open. The circuit breaker cannot be operated when the disconnect switch is in the working or test position. The electric trolley disconnect switch and the cable-side grounding switch are mechanically interlocked to prevent the grounding switch from closing when the electric trolley disconnect switch is closed. The grounding switch and the rear door of the cable compartment are mechanically interlocked; the rear door can only be opened if the cable is reliably grounded. The front and rear doors of the circuit breaker cabinet and the front door of the disconnect cabinet are equipped with electromagnetic locks, which are interlocked with a live indicator device. The live indicator sensors are connected to the busbar copper busbar and the cable thread, respectively, and can only be opened when the primary conductor is de-energized. Through the above design, the safety of operators is guaranteed to the greatest extent.

[0043] The busbar room houses the main busbar, branch busbars, etc. The main busbar connects various functional panels. The main busbar of this patented marine medium-voltage DC power distribution device can be a rectangular busbar, a D-type busbar, or other types of busbars for connecting various functional panels. In design, this invention / utility patent meets the requirements for electrical clearance and creepage distance while ensuring better dynamic and thermal stability of the main busbar and addressing issues such as temperature rise. Considering the limited space in the ship's main power distribution panel room, in special cases where it is not possible to install a measurement panel, a busbar grounding switch and voltage transformer can be added to the busbar room. To ensure electrical safety performance, the design of the busbar grounding switch or voltage transformer also fully considers the requirements for electrical clearance and creepage distance in the busbar room.

[0044] The instrument compartment has mounting plates for installing components. The instrument compartment adopts an independent and modular design, which not only increases the effective space utilization of the instrument compartment and facilitates factory wiring and user testing and maintenance, but also allows for flexible internal layout according to user needs. In addition, it has the advantages of facilitating the assembly of cabinets in the processing plant, improving processing efficiency and saving costs.

[0045] Three pressure relief plates on the top of the cabinet provide pressure relief channels for electric arcs inside the circuit breaker compartment, busbar compartment, and cable compartment, respectively. The pressure relief direction is towards the top of the cabinet. The pressure relief window is a rectangular metal top plate, fixed on one side with a hinge and on the other side with nylon screws. When a fault occurs inside the cabinet, the top plate deforms and opens to release pressure and vent gas. After pressure relief, the top plate is unusable and must be replaced before it can be put back into operation.

[0046] The instrument panel can be equipped with digital integrated protection devices, various instruments, indicator lights, buttons, and optional switches.

[0047] The system employs interlocking devices such as the busbar compartment grounding switch operation interlocking device, the handcart compartment interlocking device, and the cable compartment door and grounding switch operation interlocking device. Through a combination of mechanical and electrical interlocking, it provides operators with a safe working environment.

[0048] In addition, the bottom of the medium-voltage distribution board of the present invention can adopt other installation methods such as bottom channel steel and shock absorbers. The grounding connection bar in each room is connected to the total grounding connection bar of the cabinet, and finally connected to the common ground of the ship through the connection bar.

[0049] The present invention has the following main features:

[0050] 1. The medium-voltage DC power distribution device of this invention is suitable for integrated power systems using permanent magnet synchronous generators and controllable rectifier technology. The medium-voltage DC power distribution device uses a DC integrated relay protection device combined with a solid-state circuit breaker to achieve DC system protection. The medium-voltage DC power distribution device of this invention adopts a water-cooled design.

[0051] 2. The marine medium-voltage power distribution device of this invention adopts a centrally located, metal-clad, enclosed switchgear. The cabinet structure is machined using CNC machine tools and employs a double-bending process to enhance the local strength and rigidity of the cabinet. It is divided into four compartments by grounded sheet metal: a circuit breaker compartment, a busbar compartment, a cable compartment, and an instrument compartment. Pressure relief channels are provided on the top of the circuit breaker compartment, busbar compartment, and cable compartment for arc protection. Furthermore, it employs a combination of electrical interlocking between the circuit breaker and the electric trolley disconnect switch, mechanical interlocking between the electric trolley disconnect switch and the grounding switch, mechanical interlocking between the grounding switch and the rear door of the cable compartment, electromagnetic locks on the front and rear doors of the circuit breaker cabinet, and mechanical and electromagnetic locks on the cable compartment door, providing a safe working environment for operators.

[0052] 3. The instrument room of the marine medium-voltage power distribution device in this invention adopts an independent and modular design, which not only increases the effective use of space, but also allows the internal layout of the module to be adjusted according to the actual project requirements, which facilitates the wiring of secondary cables and instruments, increases the working efficiency of the factory and saves costs, and provides a reliable power supply design scheme.

[0053] 4. The busbar compartment of the marine medium-voltage DC power distribution device of the present invention can be equipped with a busbar grounding switch and a voltage transformer. The relevant functions can be realized by a single panel, thus completing the design scheme for power supply of the busbar panel (bridging panel) of the medium-voltage DC power distribution device.

[0054] The above examples are merely illustrative of the principles of the invention and are not intended to limit the invention. Any modifications and optimizations made to the above examples by those skilled in the art without departing from the principles of the invention are permitted, and such modifications and optimizations shall fall within the scope of protection of this invention. Therefore, the scope of protection of this patent shall be determined by the appended claims.

Claims

1. A marine medium-voltage DC power distribution device based on a water-cooled solid-state circuit breaker, characterized in that: The system includes a cabinet, circuit breaker compartment, instrument compartment, cable compartment, and busbar compartment. The top of the cabinet is equipped with pressure relief plates for the internal arc relief channels of the circuit breaker compartment, busbar compartment, and cable compartment. The circuit breaker compartment houses a power electronic switch valve string unit, which includes IGBT valve string compartments, diode valve string compartments, an isolation transformer, an electric isolating trolley, and pressure relief channels. The diode valve string compartments and IGBT valve string compartments are connected. The instrument compartment in the upper part of the cabinet houses secondary terminal blocks, circuit breakers, controllers, relays, integrated relay protection devices, fiber optic current transformer junction boxes, electromagnetic locks, cable compartment voltage transformers, zero-sequence current transformer mounting brackets, and grounding connection blocks. The secondary terminal blocks are equipped with operating switches, live indicators, and open / close status indicators. Indicator lights; the cable compartment includes external cable copper busbars, current transformers, and voltage transformers; live display devices, voltage transformers, and current transformers are installed on the busbars; the busbars connect the busbar side and the cable side, and grounding switches are installed on the cable side; the busbar compartment is equipped with main busbars and branch busbars, the main busbar is used to connect each functional panel, and each functional panel adopts a separate bus tie panel, which can reduce the space volume of the ship's main switchboard while completing the measurement and protection functions of the medium-voltage DC power distribution device bus tie panel; the power electronic switch valve string unit is electrically interlocked with the electric handcart disconnect switch, mechanically interlocked with the electric handcart disconnect switch and the grounding switch, mechanically interlocked with the grounding switch and the cable compartment rear door, electromagnetic locks on the front and rear doors of the circuit breaker cabinet, and mechanical and electromagnetic locks on the cable compartment door are combined.

2. The marine medium-voltage DC power distribution device based on a water-cooled solid-state circuit breaker according to claim 1, characterized in that: The pressure relief channel is directed towards the top of the cabinet. The pressure relief window is a rectangular metal top plate, which is fixed with a hinge on one side and with nylon screws on the other side. When a malfunction occurs inside the cabinet, the rectangular metal top plate deforms and opens to release pressure and vent gas.

3. The marine medium-voltage DC power distribution device based on a water-cooled solid-state circuit breaker according to claim 1, characterized in that: The main busbar uses rectangular busbars and D-type busbars to connect the various functional panels.

4. The marine medium-voltage DC power distribution device based on a water-cooled solid-state circuit breaker according to claim 1, characterized in that: Each function panel has a distribution board equipped with a circuit breaker button, a test light button, a reset button, a live indicator, an ammeter and a changeover switch, and a position status indicator.

5. The marine medium-voltage DC power distribution device based on a water-cooled solid-state circuit breaker according to claim 1, characterized in that: Marine medium-voltage DC power distribution equipment is equipped with integrated protection devices to protect the busbars and cables; ammeters are installed to detect the bus tie current; and the opening and closing operations of the bus tie panel circuit breaker are performed via the opening and closing buttons on the panel.

6. The marine medium-voltage DC power distribution device based on a water-cooled solid-state circuit breaker according to claim 1, characterized in that: The bottom of the cable compartment has an opening for external cables to enter, and there is a designated location inside the compartment for installing cable heads; the cross-section of the conductors connecting the high-voltage components and cable heads inside the cable compartment, in addition to meeting the rated current specified on the nameplate, along with the supporting insulators, can withstand the rated peak withstand current, rated short-time withstand current and rated short-time duration specified on the nameplate of the high-voltage switchgear. Cable mud is used to protect the connection between the cable room and the cable trench to prevent small animals from entering.

7. The marine medium-voltage DC power distribution device based on a water-cooled solid-state circuit breaker according to claim 1, characterized in that: In special cases where it is not possible to install a measuring panel, a busbar grounding switch and a voltage transformer shall be installed in the busbar compartment. The installation of the busbar grounding switch or voltage transformer shall meet the requirements of electrical clearance and creepage distance in the busbar compartment to ensure electrical safety performance.

8. The marine medium-voltage DC power distribution device based on a water-cooled solid-state circuit breaker according to claim 1, characterized in that: The bottom of the cabinet is equipped with channel steel and shock absorbers. The channel steel is connected to the grounding connection bar and shares the ground with the hull through the connection bar.

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