Assessment of failure rate for substation equipment life cycle based on Marquardt parameter estimation method
Wei Zhang · Power System Protection and Control · 2012
According to some theoretical research methods of relevant equipment failure rate,and based on Marquardt parameter estimation method,the assessment method of failure rate of substation equipment life cycle is established. For example,in a power transformer,first of all,through establishing the model of power transformer failure rate,fuzzy analytic hierarchy process(FAHP) is utilized to determine the importance degree of each event,and the reliability degree of power transformer is calculated. Then Marquardt method is utilized to estimate the parameter of two-parameter Weibull distribution function,thereby obtaining the cut-off of failure rate and the distribution curve function of failure rate. Finally in accordance with the failure rate distribution circumstances obtained from distribution function,the life cycle failure rate can be assessed,so as to provide the management decisions for power transformer condition-based maintenance,technical upgrading,etc.