Mathematics · Power System Protection Calculations
A star-connected, 3-phase, 10 MVA, 6.6 kV alternator is protected by circulating current protection (Merz-Price scheme). The star point is earthed through a resistance r. Estimate the value of earthing resistance r if 85% of the stator winding is protected against earth faults, assuming a pick-up setting of 20%. Neglect the reactance of the alternator winding.
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1r = 5.00 Ω
- 2r = 8.70 Ω
- 3r = 6.20 Ω
- 4r = 3.27 Ω✓
Correct answer
r = 3.27 Ω
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