Tap changers are devices that can increase or decrease the output secondary voltage by changing the turn ratio of primary or secondary winding. A tap changer is usually installed on a high voltage ...

Solid-state ac supplies replace motor-generator and tap-changing transformers to offer the same tests at the push of a button • Solid-state ac-power sources combine the variable-frequency and ...

Many Westinghouse UVTs were placed in service more than 40 years ago, and even the youngest ones have been in the field for more than 25 years. Spare parts are costly and increasingly difficult to ...