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Methods and benefits to the application of ultra-high-speed transformer protection

In the spring of 2016, a fault occurred in a large single phase auto-transformer on the transmission system of a major US electric utility. The fault was cleared in a time that met standard operating speeds of both relaying and the circuit breaker but a tank failure occurred that caused the spill of a large amount of oil. Significant damage to the core and coils of the transformer also occurred.