| 摘要 |
<p>PURPOSE:To detect disconnection accurately regardless of temperature variation by providing an intermediate point slip ring and an intermediate point brush then monitoring variation of the voltage bearing rate between the sections of a field winding in a rotor and detecting disconnection. CONSTITUTION:The armature 1 of a synchronous machine serves as a stator while the field winding 2 of the synchronous machine serves as a rotor. Power is fed through a slip ring 3 and a brush 4 to the field winding 2. An intermediate slip ring 6 and an intermediate brush 7 for connecting the intermediate point of the field winding 2 electrically with the rotor and a static section are provided, then the differential voltage between the intermediate point and the neutral point of a voltage divider 8 is fed through an LPF 9A to an amplifier 9B and the amplified voltage is compared with a specific value through a comparator 9C. A disconnection alarm is produced when the amplified voltage exceeds over the specific value.</p> |
