Appendix C
AVTMTTR25 Rev C April 2008
43
Notes to Table C-2
Transformer terminal markings for distribution and power transformers marked in
accordance with requirements of
American National Standard Institute, Inc
(ANSI) standard C57.12.70 – 1978.
Definition of Symbol Designations
H
1
, H
2
, H
3
External terminals on HV transformer winding.
X
1
, X
2
, X
3
External terminals on LV transformer winding.
H
0
External neutral terminal on HV transformer winding.
X
0
External neutral terminal on LV transformer winding.
*
Inaccessible neutral point on HV or LV transformer winding.
V
H
Nameplate voltage rating (line-to-line) of HV transformer winding.
V
X
Nameplate voltage rating (line-to-line) of LV transformer winding.
A, B, C
Winding tested on HV side of transformer.
a, b, c
Winding tested on LV side of transformer.
