C57.12.26-1987 - American National Standard for Transformers- Pad-Mounted Compartmental -Type, Self-Cooled, Three-Phase Distribution Transformers for Use With Separable Insulated High-Voltage Connectors, High-Voltage, 34500 Grd Y/19 920 Volts and Below; 2500 kVa and Smaller | IEEE Standard | IEEE Xplore