why is the soft iron is use to make the core of transformer
Answers
An OLTC varies the transformer ratio while the transformer is energized and carrying load. The switching principle uses the “make before break” contact concept. An adjacent tap is bridged before breaking contact with the load carrying tap for the purpose of transferring load from one tap to the other without interrupting or appreciably changing the load current. While in a bridging position (i.e., contact is made with two taps), some form of impedance (resistive or reactive) is present to limit circulating current. A high speed resistive type OLTC uses a resistor pair to absorb energy and does not use the bridging position as a service position. A reactive type OLTC uses a reactor that is designed for continuous loading, e.g., a preventative autotransformer, and therefore uses the bridging position as a service position.
Explanation:
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