ELEC 250 Lecture Notes - Lecture 5: Three-Phase Electric Power, Delta Ii, Short Circuit
Document Summary
The standard angular displacement between reference phases of a delta-delta bank or a. The standard angular displacement between reference phases of a wye- The american national standards institute (ansi) standard c57. 12 stipulates that for such three-phase banks the hv reference phase angle is 30 ahead of the reference low voltage, regardless of whether the bank connections are wye- The lead marking of three-phase transformers has been standardized by ansi and nema for the purpose of paralleling operation. The hv lead h1 is brought out on the right side when facing the hv side of the transformer case. The remaining hv side leads h2 and h3 are brought out and numbered in sequence from right to left. The low-voltage side lead, x1 is brought out on the left side facing the low side of the transformer case. The remaining low-voltage side leads, x2 and x3, are numbered in sequence from left to right.
