This month’s Featured Technical Paper is from the Proceedings of the 2017 International Conference of Doble Clients. The paper is titled: Failure Characteristics of OIP vs. RIP Bushings
Resin Impregnated Paper (RIP) bushings are becoming increasingly popular with utilities today. The seismic withstand capabilities, improved mechanical strength, and improved safety performance with composite outer envelopes are often cited as reasons utilities are moving towards RIP bushings. While in general, RIP bushings offer improved reliability, failures may still occur. Understanding the design and failure characteristics of RIP bushings vs. Oil Impregnated Paper (OIP) bushings can help the user make better decisions when interpreting their online and offline test data. Since the failure modes of these two bushing types are very different, understanding how they fail, is necessary when investigating alarms from online monitoring systems.
This paper will review the basic design principals of OIP and RIP bushings, typical failure modes, and correlate these failure modes with data collected from online monitoring systems.
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