| 摘要 |
FIELD: electric engineering. ^ SUBSTANCE: invention relates to the method and device intended for measuring excitation current in electric machine with a stator (2) and rotor (4). The electric machine (1) contains excitation transformer (7) to generate excitation current as a result of electro magnetic induction (IDC) at the rotor side for powering excitation coil (6) to produce magnetic field of excitation. The method is consisted of four stages: control of excitation transformer (7) at the primary side so that to generate excitation current (Idc) in the rotor (4), which is derived from the current induced in the excitation transformer (7) on the secondary side; measuring one or several phase current in one or more phases at the primary side of excitation transformer (7); measuring maximum current value (Ipeak-measure) depending on one or more measured phase current (It); measuring excitation current (Idc) through excitation winding (6) depending on the maximum current value (Ipeak-measure). ^ EFFECT: simplification. ^ 8 cl, 5 dwg |
