A single core cable used on 33000 V has conductor diameter 10 mm and the internal diameter of sheath 25 mm. The maximum electrostatic stress in the cable is____________?
Correct answer: B. 72 x 10^5 V/m
- A. 62 x 10^5 V/m
- B. 72 x 10^5 V/m
- C. 82 x 10^5 V/m
- D. 92 x 10^5 V/m
Explanation
For a single-core cable, maximum stress occurs at the conductor surface: g_max = V/[r ln(R/r)]. Using V = 33 kV, r = 5 mm, and R = 12.5 mm gives approximately 7.2 × 10^6 V/m, or 72 × 10^5 V/m.
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