Specification and Design Consideration of Source Transformer for UHV class Transformer Test Laboratory

Testing of transformers at factory is a part of quality assurance program. Testing of any equipment is required to ensure that product meets requirement of customer specification, factory’s internal quality criteria and requirements of applicable standards. Source transformer is the crucial component of power source which is required for testing of transformers in laboratory. While designing such source transformer, some special considerations should be taken to make it more effective and useful. Some of that considerations are Impedance of the transformer, various tapping on high and low voltage windings, partial discharge free design, higher safety margins in dielectric design, compactness etc. Practical aspects considered for designing source transformer are mentioned. For more accurate analysis of impedance of transformer FEMM 4.2 software is used. For dielectric stress calculation FEA (Finite element analysis) for high low gap, top insulation and bottom insulation is presented.