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Transformer-bushing-testing, transformer bushings when bushings are new, they should be doble tested as an acceptance test. refer to the m4000 doble test set instructions, the doble bushing field test guide, and the manufacturer’s data for guidance on acceptable results.. Visual inspection of high voltage bushings. porcelain bushings should be regularly checked for cracks and/or contamination. if the bushing is damaged or heavily contaminated, leakage current will become excessive, sometimes appearing as carbon tracking, or "treeing", on the bushing surface., a transformer bushing is an insulating structure that facilitates the passage of an energized, current-carrying conductor through the grounded tank of the transformer..

A transformer bushing is an insulating structure that facilitates the passage of an energized, current-carrying conductor through the grounded tank of the transformer., acceptance and routine maintenance tests most often used for checking the condition of bushings are doble power factor tests.the power factor of a bushing in good condition will remain relatively stable throughout the service life. a good indication of insulation deterioration is a slowly rising power factor.. Special tests of transformer is done as per customer requirement to obtain information useful to the user during operation or maintenance of the transformer. pre commissioning test of transformer in addition to these, the transformer also goes through some other tests, performed on it, before actual commissioning of the transformer at the site., the transformer turns ratio test is used to make sure that the ratio between the windings of the primary and secondary coils follow the proper specifications. this test ensures that the transformer will provide the proper step-up or step down in voltage..

Power factor testing of bushings bushings provide an insulated path for energised conductors to enter grounded electrical power apparatus. they are a critical part of the electrical system that transforms and switches ac voltages ranging from a few hundred volts to several thousand volts., before delivery, each bushing is subject to an electrical routine test. the test is made in line with iec standards or, on request, according to relevant ieee standards..

Facilities instructions, standards, and techniques volume 3-2 testing and maintenance of high-voltage bushings facilities engineering branch denver office