| 摘要 |
PURPOSE:To make it possible to quantitatively diagnose the degree of abnormality, by applying A/D conversion to the primary current of a three-phase electromotor and calculating the phase difference and amplitude of a current of each phase while graphically displaying a phase non-equilibrium ratio from the difference between the max. and min of phase difference. CONSTITUTION:The primary currents of the first phase and third phase of a three-phase induction electromotor 1 are detected by current transformers 2, 3 and the signals applied to input terminals 4, 5 are converted by A/D converters 6, 7. A central processing unit 9 collects wave form data respectively outputted from the A/D converters 6, 7 to store the same in memory 10 and performs various operations. The data for performing the diagnosis of the stator coil of the three-phase induction electromotor 1 is calculated and displayed on a display device 11 and a graphic display device 12 to perform diagnosis. |
