Mechanical Forces on Transformer
- To overcome the problems of mechanical forces, circular coils should be used for the windings, as they can with stand the radial forces (in circular coils radial forces are cancelled by each other).
- Wherever it is not possible to use the circular coils, (e.g. shell type transformer) they should be braced properly. In shell type transformers though coils are rectangular they are mechanically strong as larger portion of coils is mechanically braced.
- Apart from bracing of windings, good quality of insulation (electrically as well as mechanically strong) should be used. Coils should be supported and braced by taking into consideration of mechanical stresses. Also asymmetry in magnetic field should be avoided, tapping to be provided such that asymmetry due to these tapping is evenly distributed.
- The power transformer is designed to have high leakage reactance which reduces magnitude of short circuit cument during fault hence reduces mechanical forces.