Selection and fitting of metals in electrical apparatus

This work deals with effect of proper selection of materials in electrical apparatus/equipment. When ferromagnetic materials are subjected to heavy electromagnetic flux applications, the flux creates phenomena like eddy current or Foucault currents in them according to Faraday's Law. There are numerous instances in power plants where high current application does show this behaviour like stator core bolts in HT motors, support rings in stator overhang, fitting bolts in EHV CTs etc. Improper selection of them in places of their non-applicability can cause premature failure and complete breakdown of electrical equipment. In order to overcome or foresee these types of situations, advanced condition monitoring techniques like-Thermography Analysis and tabulating all the collected data to create a trend of the readings to make a better comparison can help significantly in reduction of breakdown. Below discussed are few case studies from Mahatma Gandhi Supercritcal Thermal Power Project, Jhajjar, Haryana - A 2x660 MW coal fired Supercritical Thermal Power Project.