Marine Switchgear Common Node Power Distribution
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Solution Overview
Problem
Existing marine power generation and distribution installations face limitations in increasing power output due to voltage constraints, leading to potential overloading and damage from short circuits when daisy-chaining switchgears, which requires additional space and weight with transformers or spare generators.
Innovation Solution
A power generation and distribution arrangement with at least three switchgears connected through a common conductive node via an interconnecting busbar, incorporating intermediate coupling with circuit breakers and current limiting devices to manage current flow and prevent overloading, allowing load sharing and optimized spatial arrangement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If daisy chain the power generators or switchgears to increase power output, then power generation capacity is improved, but short circuit current carrying capacity deteriorates due to series connection causing high currents in all switchgears
Solution Approach 1:
The electrical system is segmented into multiple independent radial feeders, each with its own switchgear and power generator connection. This segmentation isolates short circuit currents to individual feeders, preventing them from propagating through the entire daisy-chained system. Each switchgear operates independently with dedicated protection, resolving the contradiction by maintaining system reliability while allowing power output scaling through additional radial feeders.
Solution Approach 2:
A common conductive node acts as an intermediary connection point for multiple switchgears, replacing the direct series connection. This intermediary structure allows each switchgear to connect to the common node independently, enabling power aggregation without creating series current paths. The common node facilitates power output increase while maintaining electrical isolation between switchgears for short circuit protection.
2Stress or pressure
If install step-up transformers to increase output voltage above classification voltage, then voltage level is improved, but device complexity and weight increase due to additional transformers
Solution Approach 1:
The system changes the electrical configuration parameter from series connection to radial connection with a common conductive node. This parameter change allows multiple switchgears to operate in parallel electrically, aggregating their power outputs directly without requiring voltage transformation. The radial configuration enables voltage levels to be maintained within classification limits while achieving higher total power output, eliminating the need for step-up transformers.
3Power
If install switchgears in two or more independent islands to increase power generation, then power capacity is improved, but device complexity increases due to requirement for spare generators in each island
Solution Approach 1:
The common conductive node serves multiple functions: it acts as a connection point for all switchgears, a load sharing mechanism, a protection coordination point, and a system neutral. This multi-functional element eliminates the need for separate spare generators in each island by providing centralized power aggregation and load balancing. Any switchgear can supply power to any load through the common node, providing system-wide redundancy without duplicating generator capacity.
Data Source
AI summary
A power generation and distribution arrangement that includes at least three switchgear sections. Each switchgear includes at least one or more power generators and an internal busbar in which the one or more power generators are electrically connected to the internal busbar. The internal busbar of each switchgear has one connecting end that is electrically connected to a common conductive node of the arrangement. The common conductive node includes an external interconnecting busbar between the switchgear sections.