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The neutral point of a 11 kV three-phase generator was protected using circulating current system which was grounded thr
Posted: Wed Apr 27, 2022 5:52 pm
by answerhappygod
- The Neutral Point Of A 11 Kv Three Phase Generator Was Protected Using Circulating Current System Which Was Grounded Thr 1 (44.12 KiB) Viewed 27 times
The neutral point of a 11 kV three-phase generator was protected using circulating current system which was grounded through a resistance of 8.47 22. The protective relay was set to operate when unbalanced current 2 A to flow in the pilot wire. If the secondary rated current of CTs is 5 A, find the suitable CTs ratio to protect 60% of stator phase winding due to the fault to earth (fault impedance is zero). The stator winding impedance is negligible. If 85 % of the stator winding is to be protected, with the same setting, determine the new value of the grounding resistance.