This recommended practice covers routine impulse tests performed on distribution transformers@ as required in IEEE Std C57.12.00-1993@ and described in subclause 10.4 of IEEE Std C57.12.90-1993. Distribution transformers covered by this recommended practice are liquid-immersed@ single- and threephase overhead-type up to 500 kVA; single-phase pad-mounted compartmental-type and underground-type up to 167 kVA; three-phase pad-mounted compartmental-type and underground-type up to 2500 kVA. These transformers are covered by IEEE Std C57.12.20-1988 through IEEE Std C57.12.26-1992. This recommended practice covers only those aspects of impulse testing that are speci?c to routine testing of distribution transformers. For more thorough coverage of impulse testing of transformers in general@ the IEEE Guide for Transformer Impulse Tests@ IEEE Std C57.98-1993@ should be consulted. Purpose This recommended practice is to assist manufacturers of distribution transformers in the setup and operation of a routine impulse test@ and to assist distribution transformer users and purchasers in understanding the routine impulse test and how it differs from design tests.
IEEE C57.138-1998 history
2016IEEE C57.138-2016 Recommended Practice for Routine Impulse Tests for Distribution Transformers
1998IEEE C57.138-1998 Recommended Practice for Routine Impulse Test for Distribution Transformers