Tapping (tap)
The ±2.5 / ±5 % taps to adjust the voltage to the real network.
Definition
A tapping (or “tap”) is an intermediate connection point on a winding, which allows the number of turns in service to be changed and thus the turns ratio to be adjusted. They are also called tap points, generally stepped in increments of ±2.5 % or ±5 %.
Taps serve to compensate for a permanent difference between the actual network voltage and the rated voltage, or to adapt a single transformer to several supply voltages. On distribution transformers, they are most often on the primary, and are switched de-energised.
It is a simple and robust way to obtain the right output voltage without redesigning the unit.
The ABL tip
If your network runs high or low in voltage, or if you export to several countries, taps make a single transformer versatile. State your supply voltages: we integrate the appropriate taps from the design stage.
