Generator protection, calculating resistance for protection

Thread Starter

Lambo Av

Joined Apr 24, 2019
59
A 20kV, 100VA generator is protected by differential protection. 70% of the winding will be protected against the phase. What is the value of resistance to be located at the "Neutral to Ground" protection if the relay operates 30% out of the balance current?
Below are my steps to the solution. Is it correct? (I do not have the final answer, sorry)
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If there is any mistake, mind pointing them out and explain what to correct on?
 
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