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Synchronous generator to the grid. Having issues with exciter field breaker. The breaker gets its signal to close and occasionally (1, 2 times monthly), it rejects closing and unit trips, no alarms on the excitation panel, 64f trips, 86g trips. i have noticed higher than normal generator terminal voltage during failures any possibilities would help. We have megger generator and field breaker and found nothing, just reset and go for another start and works fine? Thanks