What is a tap on a transformer?
That said, what is a tap? Actually, it’s a direct connection to a turn on a transformer winding at a voltage other than the normal rated voltage. Its lead is brought out to a terminal on the surface of the coil or on a terminal board of the transformer.
Why are taps needed on a transformer?
Transformers are normally provided with taps to adjust the turns ratio to compensate for this supply variance. This will allow the output voltage to be closer to the rated output voltage when the input voltage is off rated voltage. What is a Tap? Each turn on both the high and low voltage coils has the same voltage.
Why are there taps on a welding transformer?
Taps on the winding transformers help reduce the voltage thereby preventing heat-up problems. Points on the secondary coil can be attached to modify the welding current. Taps are connected in some welding transformers to the secondary coil windings to provide the correct voltage. These taps provide a full output at the terminals.
Where are the taps on a welding coil?
Taps can be located at a different position on the secondary coil. The main method of providing taps is to join on the last layer of the coil. The layer of the coil is situated away from the finish line. In most cases, there are breaks between the taps number four and five on the tap section.
What makes a welding transformer a step down transformer?
A welding transformer is a step down transformer that has thin primary winding with a large number of turns and its secondary has more area of cross-section and less number of turns ensuring less voltage and very high current in the secondary.
When do you change the tap position on a transformer?
If, on-load, the secondary voltage reduces to 4050 V then, which tap, should be used to maintain 4160 V on-load (assuming the supply voltage remains constant)? To keep the secondary voltage at (or as close as possible to) 4160 V, either primary supply voltage or the HV winding tap position must be altered.