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Development of improved methods for type testing present day medium voltage circuit breakers for outdoor service

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2 Author(s)
S. B. Kuznetsov ; PSM High Power Labs., East Pittsburgh, PA, USA ; H. E. Spindle

Type testing for fault currents for medium-voltage circuit breakers rated at 15 kV to 72.5 kV is addressed. The ANSI designation of a new class of definite-purpose circuit breakers capable of switching transformer secondary faults and the introduction of the requirement for short-line-fault tests for breakers rated 72.5 kV and below have increased the difficulty of performing type tests in a testing laboratory. It is concluded that synthetic testing using the parallel current injection circuit is described in ANSI C37.081 provides the best available method for proving these complex requirements for medium-voltage circuit breakers

Published in:

IEEE Transactions on Power Delivery  (Volume:8 ,  Issue: 1 )