Current transformer failure caused by electric field associated to circuit breaker and pollution in 500 kV substations

This research has analyzed a failure mode caused by electric field in 500 kV substations, the problem was focus on current transformers. Three current transformers have failed, exploiting near the circuit breakers in the same phase, the analysis and the root cause of this fault has been developed in a special condition, the coast of Peru, and the novel contribution is a recommendation for the physical layout in substations, insulation coordination and standards of electric field for the design of substations for 500kV.