What is tapping in transformer?

Answer 1

Transformers may be supplied with an LTC (load tap changer) that physically adds/removes windings from one side to control the voltage output of the transformer. If the LTC is moving, it is referred to as "tapping". An LTC has several discrete tap positions. The ones I see most often have 33, 16 up, 16 down, and a neutral.

Answer 2

A 'tap' is simply a connection, part way along one of the transformer's windings.

For example, in North America, the secondary winding of a distribution transformer has a tap midway along that winding. This tap is earthed, and provides the neutral connection, while opposite ends of the same coil each have a potential of 120 V with respect to the centre tap. This arrangement provides the consumer with 240 V (across the complete winding) and 120 V between either end of the coil and the centre tap.

Taps are also used on the high-voltage winding of a transformer, to allow minor adjustments to the turns-ratio of a transformer which then allows minor changes in the output voltage to be made to accommodate changes in load.

Answer 3

On single leg primary high voltage transformers as well as three phase transformer banks there is a handle on the side of the transformer case that is used to change the winding taps inside the case from 13872 to 8018 volts depending on the supply to ground voltage. This allows the utility company to use the same transformers on two primary nominal voltages of 24000 and 14000 volts. In North America primary voltages are wired in wye configurations. 24000/1.73 = 13872 and 13872/ 1.73 = 8018 to ground.

On lower voltage dry transformers the taps are usually changed by hand. These types of taps use a nut and bolt and are physically repositioned to another terminal position which increases or decreases the winding length of the transformers coil.

Answer

Identical tap settings are provided for each of the transformer's three high-voltage windings, and these are mechanically interconnected so that they operate together -whether manually (typically distribution transformers) or automatically (typically power transformers). Manual tap-changing is performed with the transformer disconnected from its load, whereas automatic tap-changing can be performed with the transformer on load.

Answer 4

The multiple coil