JERAJournal of Electronic Research and Application2208-35022208-3510Bio-Byword Scientific Publishing Pty. Ltd.10.26689/jera.v10i4.14892ArticleCharacteristic Frequency Injection Technology for Secondary Cables in Substation Renovation Projectshttps://artdesignp.com/journal/JERA/10/4/10.26689/jera.v10i4.14892LiZhengjun,FangJiancheng,SunDianlong,ZhangJinghan20261042026-05-21This paper investigates key technologies for reliable electrical monitoring in complex power environments. Core techniques include anti-electromagnetic interference sensing, multi-source signal isolation and filtering, characteristic signal injection with non-contact identification, multi-channel real-time data acquisition, and rapid fault recognition with protection interruption. Experimental analysis demonstrates stable monitoring performance and effective fault detection under electromagnetic disturbance conditions.

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