1 No. 22 kV / 0.433 kV, 4000 kVA Transformer with OLTC, RTCC and all necessary accessories. OLTC tapping range +5.0 % to -15.0 %, , tapping step 1.25 %, vector group – Dny11, cooling – ONAN, the transformer oil should be ESTER OIL only, Protection class I