Condition Assessment for Emergency Diesel Generators

This month’s Featured Technical Paper is from the Proceedings of the 2016 International Conference of Doble Clients. The paper is titled: Condition Assessment for Emergency Diesel Generators.



There is a need in the Nuclear Industry for condition assessment of the standby emergency generators. Most in the USA are over 30 years old but often have 2000 hours or less of full load operation. There have been exciter, voltage regulator, breaker, and power cable problems. Very few generator stator failures have occurred. Most machines operate at 4 kV and all are rated less than 10 MW. Very limited generator condition monitoring is installed. Since these are safety related systems there is reluctance to add new sensors because of the design change expense involved.

Electro-Magnetic Interference, EMI, Diagnostics is an on-line, in-service evaluation that can detect numerous mechanical and electrical problems of a generator system from the first test. Trending helps to identify a variety of problems early in their evolution. There is no interference with normal operation to collect data during a monthly scheduled generator test run. Case studies are presented.

Examples of problems found with alignment, generator exciter, voltage regulator, stator and power cables are presented from several non-nuclear emergency generators tested and over one hundred larger engine driven generators tested over the past five years.

Doble Service Agreement Clients

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