Dead Tank is more applicable because its cheaper. The manufacturing of bushing for power transformer can be used is this case and automatic wrapping of paper made it easy to manufacture (time and cost reduces) and available in plenty from many manufacturers. Installation is easier since the tank is far from live line. Advantages of Live tank –> a) Shorter primary conductor gives better rigidity and high short circuit current withstanding capability. b) With uniformly distributed primary winding these CTs are with lower reactance –>provides inherent better transient performance. c) Main source of heat – high current part is only in primary tank — ensures less heating of bushing/core compared to dead tank type design. This ensures better thermal stability and less problem created through dissolved gas in insulating oil. In case something goes wrong – a well designed live tank CT wont explode only from top unlike the blast of insulator core of dead tank CTs’ which can damage human life a well as the other substation equipments nearby. Regards Saptarshi