Existing　IOT　communication　protocols　such　as　MQTT(Message　Queuing　Telemetry　Transport)　and　CoAP(Constrained　Application　Protocol)　cannot　meet　the　requirements　of　high　reliability　and　real-time　performance　for　the　power　system.　To　solve　the　problem,　this　paper　proposes　a　reduced　IEC61850　9-2SV　(Sample　Value)　protocol　for　the　IOT　controller,　ensuring　high　sample　time　for　ADC　and　high　transmission　frequency　of　IOT　devices.　The　protocol　simplifies　and　trims　some　parameters,　and　changes　the　floating-point　value　into　integer　data.　To　decrease　the　burden　of　WIFI　transmission,　we　proposed　the　bundle　message　and　replacement　message.　The　former　bundle　several　sample　value　at　the　different　time　stamp　and　transmit　them　just　in　one　payload.　The　latter　tells　the　receiver　how　to　replace　some　information　in　the　former　message　to　get　a　new　one.　The　experiment　shows　the　maximum　transmittance　frequency　of　SV　messages　could　be　considered　as　a　constant,　1/15us.　The　bundle　number　has　a　linear　relationship　with　maximum　transmission　bits　per　second　and　maximum　sample　rate.　When　bundling　45　sample　values　in　one　payload,　the　maximum　transmission　rate　is　163.2　Mbps.　©　2022　IEEE.