Question

In an experiment for determining the breakdown strength of transformer oil, the following observations as in Table 1 were made.

Gap spacing (mm)	3	6	9	10
Voltage at breakdown (kV)	70	150	180	260

i. Derive a mathematical formula to relate the gap spacing and the applied voltage for the oil.
ii. Compute the distance between the two electrodes if the voltage applied is 200 kV.

Answer 1