TRANSFORMER SWGR UNIT;12 KV;2000 A;25KA; 2000 A BUS;METAL ENCLOSED FIXED SWGR; CONTROL GEAR ASSEMBLY;110 V DC AUX SUP- PLY C/W CURRENT TRANSFORMERS FOR TRANSFORMER;BUS PROTECTION SCHEMES;METERING;WITHDRAWABLE THREE PHASE VOLTAGE TRANSFORMER COMPRISING OF THREE SINGLE PHASE UNITS;CAPABLE OF BEING CONNECTED TO THE BUS (PREFERRED) OR ALTERNATIVELY TO THE CABLE COMPARTMENT