| 摘要 |
A protection device for asynchronous electric motor comprises a power supply unit, a set of current probes with star-connected sensors, with zero point of the star being united with device common wire. In addition, the devise incorporates LC-filter, first, second and third inputs of which are connected to inputs of first, second and third chokes, correspondingly, and connected to outputs of sensors of the current probe set, three outputs are connected to three inputs of the unit for start-up time and current control and inputs of three threshold elements, as well as connected to outputs of first, second and third chokes, correspondingly, and in series connected fourth, fifth and sixth chokes and, correspondingly, to first, second and third star-connected capacitors, outputs of which being connected to common wire of the device. |
