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After major inspection start from October 16th till November 29th, 2017, we can't completely start-up our GT, because at more 4800 rpm (at 14HS sequence) GT trip with "Generator Lockout Relay Trip (86G)" indication and 59EX (Overexcitation Relay) energized. We already checked several components and controls including Excitation Equipment until SVR Control.
Please give us some advice how to troubleshoot this case?
Please give us some advice how to troubleshoot this case?