| 摘要 |
PURPOSE:To allow the deterioration of insulation to be diagnosed quantitatively without applying high voltage and causing damage by a method wherein mechanical external oscillating force is applied to an insulated coil and the changing charcteristics of the discrete oscillating number against acceleration are obtained. CONSTITUTION:By amplifying an oscillating signal from a function generator 4 to a preselected value with a signal amplifier 5, an insulated coil 1 is oscillated by an oscillator 2. The acceleration of the insulated coil 1 is detected by a pickup 3, amplified by an accelerometer 6 and corrected before being sent to a recording indicator 7. The input signal from the function generator 4 has also been applied to the recording indicator 7. The oscillating frequency of the generator 4 is continuously changed, whereas resonance is obtained when the signal from the accelerometer 3 is maximized. The signal sent from the accelerometer 3 is maximized. The signal sent from the generator 4 indicates the discrete oscillating number. Subsequently, by changing the degree of amplification in the signal amplifier 5, the same date can be obtained. This operation is carried out in several stages to make clear the characteristics of acceleration-discrete oscillating number, so that the deterioration of insulation can be diagnosed. |
