A TRANSFORMER FOR TESTING POWER TRANSFORMERS OF 11 TO 400 KVA RATINGS

摘要

A transformer for testing power transformers of 11KV to 400 KV ratings, comprising : a high voltage (HV) winding configured in two sections (HV1, HV2), the HV termination being taken out through two sets of bushing terminal (1U1, 2U1); an online tap changers (OLTC (2) disposed at the neutral end; a coil means having a low-voltage (LV) coil in helical form (3), tapping winding (4,5) being configured in two layers, the HV1-winding (6) designed as standard helical, and HV2-winding (7,8) configured as partial interleaved disc to ensure uniform impulse distribution and lower cross-sectional area, characterized in that the first section of HV-winding (HV1) having the tap winding provide a voltage variation between 42 KV ± 38 KV obtained from terminals 2U, 2V, 2W, and in that the first and second HV- sections together (HV1 + HV2) having the tap winding provide a voltage variation between (118 KV ± 38 KV).