Main Relay and/or Breaker Test Description
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图 1 | g01276599 |
本测试测量主继电器和/或开路器两端的电压降。 测量测试点 (9) 和测试点 (12) 两端的电压降。 测试点 (9) 为正极触点而测试点 (12) 为负极触点。
电压降将使主继电器和/或开路器指示灯点亮。 电压降必须大于 1.30 ± 0.15 伏。 指示灯点亮指示电量低状态。 所有测试步骤中的故障均会指示。
该故障可能的原因如下:
- 开路器打开
- 开路器因过高电压降而关闭
- 继电器触点开路
- 闭合继电器电压降过大
- 带焊结触点的继电器
注: 如果对机器进行的本测试失败,有必要查找有故障的两个部件。
使用数字万用表查找有故障的部件。 检查主继电器 (F) 和主开路器 (E) 两端是否存在过大的电压降。 在使分析仪显示故障的测试步骤中,使用万用表进行故障诊断和排除。
机器将可能同时拥有这两个部件。 也可能只有其中一个部件。
在不含任何一个部件的机器上,测试点 12 直接连接至测试点 9。 这种连接类型将不会在分析仪上显示故障。
如果机器带有主开路器和/或主继电器,更换有故障的部件。
请参阅正在维修的机器的配线示意图。 使用示意图确定本测试电路中所使用的两个部件。
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