Subsea Junction Box for Offshore Power Distribution
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Solution Overview
Problem
Current offshore power distribution systems face challenges in efficiently transmitting and managing power from offshore generators to onshore receivers, particularly in terms of reliability, maintenance, and cost-effectiveness, especially with the increasing demand for renewable energy sources like offshore wind and wave power.
Innovation Solution
The implementation of an offshore power distribution system comprising dry mate connections, subsea junction boxes, and transformer stations, along with reserve length subsea cables, allows for efficient power transmission and flexible maintenance, reducing the need for complex subsea components and minimizing downtime.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional subsea power distribution systems are used, then power transmission from offshore generators to onshore receivers is achieved, but the systems suffer from high complexity, difficult maintenance, and high costs
Solution Approach 1:
The subsea power distribution system is segmented into modular components including junction boxes, transformer stations, and cable sections with dry mate connections. This segmentation allows independent installation, maintenance, and replacement of individual modules without affecting the entire system, thereby reducing overall system complexity while maintaining transmission reliability.
Solution Approach 2:
Dry mate connection mechanisms serve as intermediaries between cable sections and subsea equipment. These standardized connection interfaces simplify the complexity of subsea assemblies by providing plug-and-play connectivity, enabling reliable power transmission while reducing the complexity of installation and maintenance operations.
2Stability of the object's composition
If subsea components are installed permanently on the sea floor, then power transmission stability is improved, but maintenance and service operations become extremely difficult and time-consuming
Solution Approach 1:
The system incorporates dynamically reconfigurable connections through dry mate interfaces that allow junction boxes and cable sections to be temporarily disconnected and reconnected. This dynamic capability enables maintenance operations while maintaining overall system stability, as connections can be established or broken without permanent installation constraints.
Solution Approach 2:
Junction boxes are designed with pre-configured connection points and internal wiring arrangements that allow for quick connection and disconnection of cable sections. This preliminary preparation of connection interfaces enables rapid maintenance operations while ensuring stable power transmission during normal operation.
3Power
If complex subsea cable systems are used to transmit power over long distances, then power transmission capability is improved, but installation complexity and costs increase significantly
Solution Approach 1:
Long-distance power transmission cables are divided into manageable sections that can be manufactured, tested, and installed independently. Each cable section connects to subsea equipment and other cable sections through standardized dry mate connections, simplifying the overall installation process while maintaining the required power transmission capability over long distances.
Solution Approach 2:
The dry mate connection interface is designed as a universal connector that can join different cable sections and connect to various subsea equipment types. This multi-functional connection system simplifies installation operations and reduces costs by eliminating the need for specialized connection mechanisms for different components.
4Productivity
If offshore power generation capacity is increased to meet renewable energy demands, then clean energy production is improved, but the complexity and cost of power distribution systems increase
Solution Approach 1:
The power distribution system is organized into modular units that can be replicated and scaled to match increasing power generation capacity. Each module includes standardized junction boxes, transformer stations, and cable sections that can be independently deployed, allowing the system to expand with renewable energy production while maintaining manageable complexity through modular architecture.
Solution Approach 2:
Standardized dry mate connection interfaces and modular subsea equipment designs create a universal platform that can serve multiple power generation sources and distribution configurations. This universality allows the system to scale efficiently with increasing renewable energy capacity without proportionally increasing system complexity.
Data Source
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AI summary
The disclosure relates to a method for temporary removal of an offshore power generation unit (7) from an array of connected offshore power generation units (7). The method comprises disconnecting an ingoing and an outgoing array cable from the offshore power generation unit (7), providing a junction box (3) having an inlet connection point and an outlet connection point, connecting the ingoing cable to the inlet connection point and the outgoing cable to the outlet connection point, locating the junction box (3) at a subsea location, using support means to position the junction box at a subsurface location having the ingoing array cable attached to the ingoing connection point, and the outgoing cable attached to the outgoing connection point, disconnecting the ingoing and the outgoing array cable from the inlet and outlet connection points, respectively, and reconnecting the ingoing and outgoing array cable to the offshore power generation unit (7a).