three-phase three winding no-load-tap-changing power transformer: 1)low loss 2) high reliability 3)CTQC,ISO9001,ISO14001 ... domestic and foreign advanced technology, which feature low local discharge, low loss, low noise, high reliability, strange protection against abrupt ... of each winding-up, effectively lower the axial electrodynamic force generated at short-circuit of transformer and improve abrupt ...