In this paper, a new model has been presented to determine the number of spare transformers and their locations for distribution stations. The number of spare transformers must be so that they need minimum investment. Furthermore, they must be sufficient for replacing with transformers that have been damaged. For this reason, in this paper a new purpose function has been presented to maximize p...

this paper is concerned with development of a technique for performance prediction of current transformers (ct), accurately. in this technique, a new optimized model from view-point of both computation time and memory is introduced in order to simulate the current transformers on digital computers. the introduced software in this paper in combination with relay tester equipments can be used ins...

Condition monitoring of power transformers, which are key components electrical systems, is essential to identify incipient faults and avoid catastrophic failures. In this paper machine learning algorithms, i.e., nonlinear autoregressive neural networks support vector machines, proposed model the transformer thermal behavior for purpose monitoring. The models developed based on historical measu...

Power transformers are key components in electrical power supplies and their failure could cause severe consequences on continuity of service and also generates substantial costs. Identifying problems at an early stage, before catastrophic failure occurs, is a great benefit for reliable operation of power transformers. Frequency Response Analysis (FRA) is a new, well-known and powerful diagnost...

This paper focuses on a methodology to deal with load shedding in electric power systems such as to make its impact on the demand level as minimal as possible. The power demand is parameterized by the factor α, which is minimized subject to equality (real and reactive power mismatches) and inequality constraints (operational and equipment limits). Lower and upper limits on voltage magnitudes an...

In this paper, a new method for modelling and estimation of reliability parameters of power transformer components in distribution and transmission voltage levels for preventive-corrective maintenance schedule of transformers is proposed. In this method, with optimal estimation of Weibull distribution parameters using least squares method and input data uncertainty reduction, failure rate and p...