Abstract:

This paper introduced the selection basis of large capacity stepup transformer. The comparison of three phase compacted transformer and three single phase transformers was based on negativesequence current, operation reliability, operation loss, price, transportation and other aspects. To determine the short circuit impedance, unit operation stability and voltage adjusting rate were considered as well as short circuit current.

Key words:

large capacity stepup transformer, capacity, negativesequence current, reliability, loss, short circuit impedance