'A POWER TRANSFORMER HAVING ISOLATION LEVEL OF 10 KV R.M.S. BETWEEN CORE TO YOKE BOLT, CORE TO CLAMPING STRUCTURE AND CLAMPING STRUCTURE TO TANK',

摘要

A power transformer having suitable insulation provided between core (2) to yoke bolt (3) and clamping structure (1), clamping structure (1) and tank (9) to achieve an insulation level so that it can withstand 10 KV r.m.s for one minute. Special epoxy bush (4) with reinforcement of insulation on the yoke bolt (3) is provided to achieve the target insulation between core (2) and yoke bolt (3) and clamping structure (1). Thickness and width of insulation between core (2) and clamping structure (1) is increased substantially to provide adequate creepage path, so that it can withstand 10 KV r.m.s for one minute. Special fibre glass insulation (8) and PBD insulation (7) of adequate thickness provided between clamping structure (1) and tank bottom (9) to achieve the desired insulation.[IN-KOL-2010-00587A]