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针对现用的井下中央变电所安全监护装置存在的高压电网单相接地故障检测及抗干扰效果不佳的问题，着重介绍了有选择性高压接地保护子系统及装置的抗干扰设计。
In view of the existing single-phase grounding fault detection and anti-jamming effect of underground power substation safety monitoring devices, the anti-interference design of selective high-voltage grounding protection subsystems and devices is emphatically introduced.