Risk assessment for transformer loading

A risk-based probabilistic method is presented to assess transformer loadin g capability, taking into account the probabilistic nature of time-varying loads and ambient temperature,A sample calculation, with both component lev el analysis and system level analysis, is given. Quantitative reference ris k levels are obtained based on reference loading levels given by IEEE/ANSI C57.115-1991, It shows that our quantitative risk assessment is useful in a ssessing transformer loading and in aiding related decision making, An addi tional benefit is that it enables inclusion of transformer loading in compo site system risk analysis.