8. TESTING POWER TRANSFORMERS
8. TESTING POWER TRANSFORMERS High-voltage TRANSFORMERS are some of the most important (and expensive) pieces of equipment required for operating a POWER system. The purchase, preparation, assembly, operation and maintenance of TRANSFORMERS represent a large expense to the POWER system. OVERVIEW When TRANSFORMERS are received from the factory or reallocated from another location it is necessary to verify that each transformer is dry, no damage has occurred during shipping, internal connections have not been loosened, the transformer s ratio, polarity, and impedance agree with its nameplate, its major insulation structure is intact, wiring 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 the amount of preparation required to put TRANSFORMERS in service. Size and kVA rating also dictate the kind and number of auxiliary devices a transformer will require.
power Transformers (>1 MVA) be tested with TTR test set. Impedance DC winding resistance Megger and Power Factor windings, bushing and arrestors. Note: Wait until 24 hours after completion of oil filling for Power Factor testing. 13. Load …
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