| 摘要 |
<p>PURPOSE:To remarkably improve the reliability of abnormality diagnosis of an exciting equipment for synchronous machines, by performing comprehensive diagnoses based on comparison with and deviation from a wide variety of signals different in detection principle and synthesized equivalent quantities. CONSTITUTION:In a controller for an exciting equipment for synchronous machines, effective values V1, V2, V3 of three-phase voltage are detected from synchronous generator terminal voltage taken from PT, and a median VN is obtained through comparison of the effective values. When the deviation of the median VN from any of the effective values V1, V2, V3 exceeds a certain value DELTAVepsilon, unbalanced phase voltage 21 is detected. Effective values I1, I3 of one- and three-phase current are detected from synchronous generator terminal current taken from CT3. A PT system anomaly 20 is diagnosed for the reason that 'no occurrence of system accident and balanced current' 22 is detected by reason of the fact that one or both of I1 and I3 are below a certain value Iepsilon and the deviation between them is a certain value DELTAIepsilon or below.</p> |
