Transcription of 8. TESTING POWER TRANSFORMERS
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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.
4. Check and Megger all wiring point to point: Fans, pumps, alarms, heaters, tap changers, and all other devices on the transformer and interconnecting cables 5. All banks above 150 MVA should be vacuum dried. Do not apply test voltages to the winding during the vacuum drying process. Make certain the terminals
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