本系统在某县三个变电站投运7个月以来，效果良好。
This system has been running safely for 7 month, and achieved desired result.
自2005年投运以来，逐渐出现了一些由于设计原因产生的缺陷。
Some design defects occurred since it was put into operation in 2005.
自2005年投运以来，逐渐出现了一些由于设计原因产生的缺陷。
Some design defects occurred since it was put into operation in 2005.
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