ABSTRACT
The maintenance guidelines are based on electrical maintenance and engineering experience in generating stations. However, there are a number of areas where the guidelines may need to be revised by a particular generating station to meet their specific requirements. The guideline is aimed at electrical specialists and does not cover generator support systems that are normally maintained by mechanical crafts, including seal oil systems, seals, bearings, blowers, rotor balancing, water coolers, gas and air cooling systems, leak detectors, and stator inner cooled water systems. The purpose of transformer electrical maintenance guideline is to provide suggested procedures and schedules for the inspection, care, and maintenance of oil-filled and dry-type power transformers 500 kVA and larger, including on-site spare units. Internal inspections are normally only performed when it is absolutely necessary to drain the oil to perform a maintenance repair. The inspection should be completed by engineers or specialists with prior experience in inspecting transformers.
