| 摘要 |
<p>A transformer apparatus uses SCR devices (152,153; 252,253) as tap switching elements for a tapped winding (113,117) of a transformer (100). A snubber circuit (180,280) is connected in parallel with each tap switching element. Current flow in a snubber circuit associated with each SCR device is monitored to determine the present switched state of that SCR device. This monitored current flow is utilized by control circuitry (130) to permit turn on of an SCR device only when all of the tap switching SCR devices are presently non-conducting.</p> |
