Marine solution: The Ring Main Unit solution
- In the large market of containers and booming MV applications, shipbuilding companies are looking for innovative solutions so as to provide efficient ships and save on construction costs.
Solution in brief
- The Ring Main Unit solution combines all MV functional units to enable connection, supply and protection of one or two transformers on an open ring network.
- Opex reduction: length of HV cables reduced, shortening average ratio >30% for the configuration
- Peace of mind: The new RM6 generation benefits from the accumulated experience acquired from the 850,000 functional units that equip electrical networks in more than 50 countries in America, Asia, Europe and Australia.
- Improvement of network maintainability and availability :
A failed cable section on the HV loop can be disconnected
Automatic reconfiguration of the HV loop is possible after fault detection.
- Optimised main HV switchboard footprint
- Reduction of losses
- Easy feeder segregation
- Choice of ‘‘all-in-one'' units integrated in a single metal enclosure,
- Fast installation, fast cable connections on the front.
Why is the HV loop adapted to a ship?
A HV loop network is composed of several substations, called RMU (Ring Main Units). Each substation consists of several HV functions.
Two HV switch-disconnectors ensure the closing or opening of the HV loop.
One or more transformers can be protected through a circuit-breaker or a fuse switch combination.
The electrical architecture of a ship is divided into two parts:
- the machinery space composed of propulsion motors, thrusters, power generation, pumps... Generally, the associated electrical architecture is a radial configuration.
- the cargo, such as for example the accommodation part of a cruise liner. Several HV/LV transformers are dispatched in the different zones of the ship.
Therefore, a HV loop configuration is an adapted solution as the loads can be supplied as near as possible.