Actually measured the transformer with the bushings cut out (yes we were inside the 75 kVa pole mount transformer). The entire unit measured less than 500 Mega ohms on the Megger handheld. When we opened unit and disconnected the bushings we were in the 1.5 Giga ohm reading range. It is...
In Megger testing distribution transformers, how much importance is there in including the LV/HV bushings in the test. If you disconnect and have high readings independant of the bushing, and then put the bushings back into the circuit and the readings fall dramatically, what is that saying...