Power　network　monitoring　devices　play　a　key　role　in　maintaining　the　health　and　safety　of　power　networks,　so　it　is　important　to　realize　the　sustained　power　supply　to　the　monitoring　devices.　In　this　paper,　a　non-contact　self-powered　device　with　electrode-capacitor-electrode　(ECE)　structure　is　proposed,　which　can　capture　and　store　the　energy　of　the　AC　electric　field　around　the　high-voltage　line,　so　as　to　store　the　electric　energy　in　the　capacitor.　It　is　expected　to　realize　the　continuous　independent　power　supply　to　the　power　grid　monitoring　equipment.　It　is　demonstrated　that　when　the　transmission　line　voltage　is　7kV,　the　output　voltage　of　the　ECE　pole　plate　is　up　to　more　than　600V,　and　48　LEDs　can　be　lit.　For　a　capacitor　with　a　capacity　of　50mF,　it　only　takes　about　30　minutes　to　charge　15V　from　5V,　and　can　continuously　output　a　5　V　and　50mA　power　for　about　16　seconds.　In　addition,　it　is　further　found　that　the　output　voltage　of　the　rectifier　bridge　increases　as　the　parallel　resistance　increases,　which　makes　it　possible　to　effectively　control　the　charging　time　by　controlling　the　size　of　the　resistance.　The　proposed　self-powered　device　with　electrode-capacitor-electrode　structure　provides　a　new　energy　power　supply　strategy　for　grid　monitoring　devices,　which　is　expected　to　play　an　important　role　in　enhancing　the　stability　and　reliability　of　power　systems.　©　2024　SPIE.