Special features of a magnetic field of loaded transformers

摘要

A magnetic field of loaded power transformers is analysed. It is shown that under the influence of the load current the magnetic flux in the magnetic conductor considerably changes as compared with the magnetic flux without load. At low loads of the lines the transformer magnetic conductor is saturated, which leads to its overheat and the overheat of the windings. Such a mode must be eliminated by installing controllable shunting reactors at the line or by reducing the induction in the core of the transformer in idle-running to 1,4 Ts.