This white paper describes how integrated transformer Vacuum Fault Interrupter (VFI) technology coupled with secondary overcurrent sensing, arc-light sensing and modern relaying significantly reduces secondary incident arc energy. Pre-designed and factory-tested, Eaton's Cooper Power series AR-VFI transformer protection system utilizes this method to provide integral overcurrent protection on secondaries up to 6000 A.
(PDF 2 MB, 10/30/2020)