Electrical Distribution Manifold/Module (EDM)

3.3.6. Electrical Distribution Manifold/Module (EDM)

The number of electrical connectors in series is kept to a minimum. Redundant routing to the module connectors should follow different paths if possible. The cables should be installed into self-pressure compensated fluid-filled hoses. The fluid is a dielectric type. Dual barriers are provided between water and the conductor. Both barriers should each be designed for oper- ation in seawater. Manifold electrical distribution cabling and jumper cables from umbil- ical termination to the subsea control module (SCM) can be replaced by an ROV. Removal of the faulty cable is not necessary. In the case of a failure in the distribution system, it should be possible to run several SEMs on one pair after using an ROV for reconfiguration. If one electrical line is supplying more than two SEMs, the distribution and isolation units can be located in a separate, retrievable distribution module. Connection of electrical distribution cabling and electrical jumpers is made by an ROV using simple tools, with minimum implications for rig/ vessel time. The cable assemblies should be designed and installed such that any seawater entering the oil willmove away from the end terminations by gravity. The EDM is configured with the following in mind:
• Each UTA is configured with a single EDM.
• The EDM is capable of distributing the electrical and communication services of two umbilical quads from a UTH to the multiple subsea assemblies.
• There are four electrical parking positions for parking of the flying lead end of the distribution harness during installation and retrieval, each protected long term by an ROV universal protection cap.
• No other electrical parking positions are provided on the EDM. Additional parking provisions will be provided by the deployment of a separate parking frame assembly if required.
• There are eight electrical output connectors (receptacles), each pro- tected long term with an ROV universal protection cap.
• The EDM consists of oil-filled electrical splitter harnesses mounted within a retrievable structure. The splitter harness multiple outputs are terminated in bulkhead-mounted ROVelectrical plug connectors with socket contacts.
• At the input end, which connects to the UTH, the single leg of the harness is terminated with an ROV-mateable plug connector with socket contacts.
• The EDM interfaces with the tree/manifold supply EFLs and step-out EFLs to the static umbilicals, as shown earlier in Figure 3-6.
• Power and communication are provided from a female electrical connector to a male connector.