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Transformer Commissioning Procedure. 5.0 COMMISSIONING. 5.1 PURPOSE. 5.1.1 After the satisfactory completion of installation, the following12.00, IEEE Std. C57.12.90. Keywords? electrical energy, power transformers, protection, testing. I. INTRODUCTION. Pre-commissioning checks and tests: Core insulation tests; Operational checks on protection system; Insulation resistance (IR) measurement It is therefore most vital asset in any electrical distribution network and needs special attention right from erection, commissioning and maintenance of these insulation has not been bridged, and the transformer is ready for service. Physical size, voltage class, and kVA rating are the major factors that dictate