Voltage taps on the primary are used to accommodate input voltage variations.

Voltage taps on the primary are used to accommodate input voltage variations.

• A. True
• B. False
• C. Only for large transformers
• D. Only for certain winding types

Answer: (A)

Primary voltage taps let you change the effective number of turns on the winding. Because a transformer's output depends on the turns ratio, selecting a different tap on the primary changes the ratio to compensate for variations in the incoming voltage, keeping the secondary voltage closer to its rated value. This is the purpose of taps: to accommodate input voltage variations so downstream equipment remains within its voltage tolerance. Taps appear on many transformer designs, not just the largest ones, and they can be switched manually (off-load) or automatically (on-load) depending on the design.

Primary voltage taps let you change the effective number of turns on the winding. Because a transformer's output depends on the turns ratio, selecting a different tap on the primary changes the ratio to compensate for variations in the incoming voltage, keeping the secondary voltage closer to its rated value. This is the purpose of taps: to accommodate input voltage variations so downstream equipment remains within its voltage tolerance. Taps appear on many transformer designs, not just the largest ones, and they can be switched manually (off-load) or automatically (on-load) depending on the design.