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While the GCB is impossible to avoid the occurrence of a fault in the system, because of the failure of a device may be inherent weaknesses or external cause, but GCB can reduce the damage applied to the various stresses and equipment failures caused by degree. As an example, assume that the high-pressure side of the transformer bushing-to-ground fault occurs, the system fault current can be cut off high-voltage circuit breakers, if not GCB, the generator will continue to the current point of failure, device works until deexcitation. Usually deexcitation time required 5 ~ 20 s range, especially for those in the high-pressure side of the main transformer fault, within the first 40 ms, arc current from the generator side and the system side, the transformer tank internal pressure rises very rapidly . When 40 ms, high voltage circuit breakers and fault point of the system separately, arcing current supplied by the generator only if no GCB, the generator will because of a de-excitation and decay of a steady flow of current to the arc point, and maintain a few s time, the internal pressure of the transformer tank eventually rise to an explosion of extreme pressure, causing the transformer tank explosion. If the application GCB, at the time of 60 ms GCB generator moves to cut off the fault current, the pressure can be limited below the explosion pressure, can avoid transformer explosion. Thus, the use of GCB can protect the main transformer.cummins 4B3.9-G1 diesel generator price cummins 4BT3.9-G2 diesel generator price cummins 4BTA3.9-G2 diesel generator price cummins 6BT5.9-G1 diesel generator pricecummins 6BT5.9-G2 diesel generator price cummins 6BTA5.9-G2 diesel generator price cummins 6BTAA5.9-G2 diesel generator price cummins 6CTA8.3-G1 diesel generator pricecummins 6CTA8.3-G2 diesel generator price cummins 6CTAA8.3-G2 diesel generator price cummins 6LTAA8.9-G2 diesel generator price cummins NT855-GA diesel generator pricecummins MTA11-G2A diesel generator price cummins NTA855-G1A diesel generator price cummins MTAA11-G3 diesel generator price cummins NTA855-G1B diesel generator pricecummins NTA855-G2A diesel generator price cummins 6ZTAA13-G3 diesel generator price cummins 6ZTAA13-G2 diesel generator price cummins QSZ13-G2 diesel generator pricecummins QSZ13-G3 diesel generator price cummins NTA855-G4 diesel generator price cummins KTA19-G2 diesel generator price cummins NTAA855-G7 diesel generator pricecummins NTAA855-G7A diesel generator price cummins KTA19-G3 diesel generator price cummins KTA19-G3A diesel generator price cummins KTA19-G4 diesel generator pricecummins KTAA19-G5 diesel generator price cummins KTA19-G8 diesel generator price cummins KTAA19-G6 diesel generator price cummins KTAA19-G6A diesel generator pricecummins KT38-G diesel generator price cummins KTA38-G2 diesel generator price cummins KT38-GA diesel generator price cummins KTA38-G2B diesel generator price cummins KTA38-G2A diesel generator price cummins KTA38-G5 diesel generator price cummins KTA38-G9 diesel generator price cummins KTA50-G3 diesel generator price cummins KTA38-G8 diesel generator price cummins KTA50-GS8 diesel generator price