Seismic behavior of `candle' type SF6 outdoor circuitbreakers and associated SF6 insulated current transformers

The authors analyze the seismic behavior of live tank circuit breakers of the candle-type architecture, i.e. breakers that support only one chamber per column and have a closing resistor built in the interrupting chamber. This arrangement has a lower interrupting module weight and the resistor is in the axis of the column. In the case of T or V configurations with two chambers per column and with a closing resistor chamber in parallel to the main chamber, it results in some large masses off-centered on each side of the column. It is shown that the candle architecture makes possible a simple simulation and economical solution to the problem of seismic resistance, SF₆ current transformers associated with these breakers are also modeled by a simple computational model