Specifications include, but are not limited to: 1.1 This specification coverc the electricalcharacteristics and mechanical features of single-p hase, 6 0 HE, mineral-oil-immersed, self-cooled, padmounted compartmental type distribution type transformers, rated 25Kva through 167Kva. High voltage for operation between one phase and grounded neutral.; 1.2 All characteri,stics, definitions and terminology, except as specifically covered in this specification, shall be in accordance Mth the Amefican N atian a I stan dards I n stitute, standards c57 JL.AO, C57 . 12.20 and C57. 1 2.80, latest revisions thereof.; RATINGS: 2.1 kilovolt-Ampere Rating Shall Be: 25, 50, 75, 100, 167, 250; As specified; 2.2 High Voltage Rating Shall Be: 13200 GRD.Y/7620; As specified; 2.3 Low Voltage Rating Shall Be: 240/120; 2.4 No taps shall be provided; 3.0 Insulation level and dielectric test levels: 3.1 the high voltage insulation shall have a Basic Impulse Level (BIL) of: Voltage Rating: 13200 GRDY/7620; BIL: 95; 3.2 The low voltage insulation shall have a Basic Impulse Level (BIL) of 30Kv and be of the 1.2 kV insulation class.; 3.3 Dielectric test levels shall be in accordance with the distribution levels of section 4 in ANSI Standard C57.12.00
