| 摘要 |
The proposed device for checking the service life of a group of switching units contains current transducers, switching detectors, service-time metersinserted in the corresponding phase circuits of the switching units, a linearization unit, an analog-to-digital converter for the current transducers,and a unit for correcting the service life with consideration for irregular operation of the switching unit. The proposed unit provides storing of thecurrent passing though the contacts of each switching unit.
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