measure pole
测量杆
以上为机器翻译结果，长、整句建议使用 人工翻译 。
The cause of the improper trip of 4 pole circuit breaker was analyzed. A subsidiary power voltage is applied to solve the problem. It is proved in practice that this measure is feasible and effective.
分析了4极断路器非正常跳闸的原因，提出采用施加外接辅助电源电压的解决措施。
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