中性点有效接地系统 system with effectively earthed neutral中性点直接接地或经一低值阻抗接地的系统。通常其零序电抗与正序电抗的比值小于或等于3，│X0/X1│≤3， 零序电阻与正序电抗的比值小于或等于1，R0/X1≤1. 本系统也可称为大接地电流系统。
3.1.4 中性点有效接地系统（system with effectively earthed neutral）：中性点直接接地或经一低值阻抗接地的系统。通常其零序电抗与正序电抗的比值小于或等于3，│X0/X1│≤3，零序电阻与正序电抗的比...
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中性点非有效接地系统 system with non-effectively earthed neutral ; neutral ineffectively grounded systems
本文针对中性点有效接地系统的送电线路的绝大部分故障类型提出了有效的检测手段。
This paper proposes effective methods to detect most kinds of faults occurred in transmission lines which are in effectively neutral grounded system.
基于故障行波理论和IEC61850标准，研制了中性点非有效接地系统数字化变电站中的单相接地故障行波选线装置。
A faulty feeder selector based on traveling wave theory and IEC61850 standard is developed for the single-phase grounding fault of digital substation in non-solid grounding power system.
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