主要原因是锅炉安全阀二次保护回路设计有缺陷，再加上安全阀起跳和回座的整定值与运行额定值相重叠造成的。
The main reasons were due to the defect in the design of safety valve secondary circuit and the overlap of the service rating and the setting for safety valve popping and reseating.
通过工程实践对电压互感器二次回路核相试验进行分析。
Analysis the voltage mutual inductor second time circulation checking phase test during the project engineering.
就三个变电所CVT故障或异常导致的二次回路电压出现了谐波、三相不平衡及暂态扰动等现象分别进行了分析。
The phenomenon of CVT faults resulting in secondary side voltage harmonics, voltage unbalance or transient disturbance was analyzed in this paper.
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