In order to research the mechanism of the full range of selective coordination of multi -level protection and improve the existing lack of selective protection ,based on the review of applied research of selective protection methods of short circuit fault in recent years ,this paper proposed the experimental system and control and test device technology solution of multi-level selective short circuit fault protection ,which provides an experimental basis for research of low voltage multi-level selective coordination protection .%为了深入研究低压配电系统多层级全范围选择性协调保护机理，改善现有选择性保护的不足，在综述近年短路故障选择性保护已有方法应用研究的基础上，提出了多层级选择性低压短路保护试验系统及其测控装置技术方案，为低压多层级选择性协调保护研究提供试验基础条件。
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