A WORST SUPER EXPENSIVE COMMISSIONING CALAMITY AT 320 MW UNIT No. 3 AND COLLAPSE OF TRANSFORMER PROTECTION AT RAMIN THERMAL POWER PLANT.

This paper presents unique calamity and collapse of power transformer control and protection system during multinational expatriate commissioning of 320 MW unit No.3 while starting a 6.0 KV A.C.motor of a Standby Exciter. It resulted in a brand new French design startup power transformer (2TR) explosions, 6kv bus-duct melting, protection and control panel fires, cable vault fires, 6.0 kv switch gear, control and protection d.c failures and a series of cascade destructions of electrical / mechanical / air - conditioning equipments-due to fire transmmission through the cable ducts leading to various places - boiler area, aux-boiler, water treatment, cooling tower, turbine areas 230kv switchyard, power transformer area, fuel stations.... etc. The authors presents a brief review of the occurrence and presents a series of photographs which could be an excellent self explanatory solutions for the biased views of designers 1 client I suppliers and also to correct future designers or power utilities and emphasaises for a emergency backup AC trip protections on HV and LV sides of power transformers circuit breakers in addition to DC TRIP circuits and also special attention to fireprotection systems.