can somebody explain to me electrical power distribution for jackup rigstarting from the engine to generator then bus,MCC1,MCC2,SCR
Nice to have your Q, i am also a Jack up Rig Design Engineer. Ok. see 1st of Jackup rigs have diesel generators which provide power supply for the various electrical power requirements on rig. usually the voltage level is 6.6kV, 4.16kV, 690V or 600 V which is then further reduced upto 415V, 220V/127V as per load and client requirements since it affects the design and overall space required and size of rig as well. the generated power is 1st transferred to the main PMCC or MCC known as generator switchboards. from here the power is dirtributed to various other switchboards such as jacking MCC, drilling MCC, Ventilation MCCs, VFD panels (for top drive mud pump panels through VFD/SCR system) and other MCCs for other electrical loads. voltage is further reduced upto 415V/220V/127V for lighting and other lv loads using dry type transformers. oil filled trafos are not preferred since they r bulky and not feasible to have them on rigs since its in sea and also problem in maintenance. cables used are usually of XLPE or XLPO insulation. the configuration is as follows CU/XLPE or XLPO/Inner sheath (SHF)/Armour/Outer sheath (SHF), the inner and outer sheath has to be low smoke halogen free material, armour is usually bronze wire armour, usually cables used are all flame proof as per iec 60332, cat 3-22A and cables for emergency purposes are fire resistant as per iec 60331. hope this is fine.
