We have 3 phase 26.4kV Delta - 490 volt Delta and 490 volt Wye, 3 winding transformer which feed 12 pulse rectifier on 490 volt side, generating about 3 MW for Traction service. This oil filled transformer has nameplate but no markings at 26.4kV bushings for H1, H2 and H3. Similarly on secondary R1, R3 and R5 are Delta and R2, R4 and R6 are Wye bushings with no markings. My main concern is to find H1 bushing on primary.
1. Assuming I stand on 490 Volt bushings facing 26.4 kV bushings, which side is H1 bushing....on right hand side or left ?
Thanks in advance.
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