Transformer to maintain constant flux in the core of the main

Coil is set in a concentric core column, within the low-voltage winding, outside the high  electric transformer . (Welding transformer primary, secondary coil are mounted on two core pillars)  electric meter  with load, when the secondary current increases, the transformer core to maintain  mcb circuit breaker  flux in the main, primary current must also be increased accordingly to achieve balanced secondary current. Transformer secondary active General = transformer rated capacity (KVA) × 0.8 (transformer power factor) = KW.