A practical formula for determining the thickness of insulation between low voltage and high voltage windings is__________________?
Correct answer: D. 5 + 0.9 kV mm
- A. 1 + 0.2 kVmm
- B. 2 + 0.5 kVmm
- C. 4 + 0.7 kV mm
- D. 5 + 0.9 kV mm
Explanation
The commonly used empirical expression for insulation thickness between LV and HV windings is approximately 5 + 0.9kV mm, with voltage expressed in kilovolts. It accounts for the increased insulation requirement as winding voltage rises.
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