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Stability studies were made on a digital computer of the British Columbia Hydro and Power Authority Peace River System which indicated the advisability of using high-speed excitation with a stabilizing feedback. Consideration of the novelty of this technique led to a decision to conduct field tests to confirm that the equipment would behave as forecast. In addition, these tests could provide confirmation of the assumptions and techniques employed in the use of the digital computer program. The tests were made on a small hydroelectric station connected to the main system by a relatively weak line. Single phase to ground faults were applied to the station 132-kV bus. The results of these tests and of computer simulations are shown.