直流系统环网是接地故障检测中的一个关键因素。
Loop net of DC system is an important factor in the grounding fault detection.
剖析绿地系统规划中存在的问题和矛盾，提出城市绿地系统应该采用环网式的布局结构，使城市生态系统达到相对的稳定，使新建绿地与原有绿地能很好地衔接起来。
In order to analyze the problems and contradictions of green space system planning in Changchun, I suggest the urban green space system should adopt the layout structure of ring and radial.
目前广泛使用的低频信号检测法容易受到直流系统支路中存在的对地分布电容和环网的影响。
The detection method of low frequency signal injection, which is widely used, is easily influenced by the capacitors between ground and each branch and by the ring net.
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