DANSK DSF/IEC TR 63162 ED1 PDF

This Technical Report provides failure rates at reference conditions for electric components, considering reference conditions defined in IEC 61709. IEC 61709 does not provide failure rates for components, but only provides models that allow failure rates obtained by other means to be converted from one operating condition to another operating condition. To perform reliability prediction, which is described in Annex C of IEC 61709, together with assumptions and limitations, failure rates are needed. It is recommended to state failure rate data for components under environmental and operating conditions close to the conditions in field use. Therefore, data from previous products and from field data from the organization doing the analysis is preferred. It is important to appreciate that a failure rate is not an intrinsic and immutable property of a piece of equipment. An engineer involved either in collecting or using data should fully understand the factors that influence failure rate derivation and use. Data should be obtained from the following sources in the given order of preference: a) user data; b) manufacturer's data; c) handbook data. If user data is available for the prediction, then it should be used. If no user data is available then the manufacturer’s data should be examined and, if judged suitable, used. If no manufacturer’s data is available then handbook data or other data should be examined and, if judged suitable, used. IEC 61709 H.5.3, provides a list of handbooks and standards containing failure rates data. Selected sources were considered for this publication and listed in Annex B. Failure rate data stated in this technical report were set considering these selected sources.