AS NZS 60137:2020 pdf free.Insulated bushings for alternating voltages above 1000 V (IEC 60137:2017 (ED.7.0) MOD). 5.5 Very fast transients (VFT) In the case of unusual transient stresses to capacitance graded bushings connected to gas- insulated switchgears, special investigations may be agreed upon between purchaser and supplier to cover the behaviour of the bushings. Tests are only meaningful as long...
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