This month’s Featured Technical Paper is from the Proceedings of the 2019 International Conference of Doble Clients. The paper is titled: ECI Bushing Failures in Duke Energy Transmission System and Findings of EPRI Investigation.
Duke Energy has reported five Electro Composite, Inc. (ECI) bushing failures since 2014. Three of them were 115kV class bushings installed on the transmission to distribution (T-D) type, step down transformers and one bushing failed on a generator step-up transformer in Florida. Another failure was on a 46kV class oil circuit breaker. Two failures caused collateral damages to the transformers that were scrapped due to internal damage and bushing debris scattered inside the tank and between windings. Furthermore, ten, 115kV class bushings were removed from service due to elevated power factors and capacitances that were tested during scheduled preventive maintenance tests.
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