ThemotorprotectionrelayMRM3-2offersreliableprotectionforLVandMVmotorswhichareei-theroperatedviapowercontactorsorpowercircuitbreakers.Thefollowingfunctionsareintegratedintothisrelay: Overloadprotectionacc.toIEC255-8inconsiderationoftheinitialloadfactor (thermalimage) Definiteundercurrentprotection Definitetimeovercurrentprotection(DMT) Inversetimeovercurrentprotection(IMT)withselect-abletripcharacteristics Short-circuitprotection Loadunbalancesupervisionwithdefiniteorinversetripcharacteristics Earth-faultdetectionwithsuppressionofharmonics TheMRM3-2recognizesthe Start-Up and MotorRunning phase. Motorswithalimitednumberofstartscanbecontrolledbythestartlimitingfunctionoftherelay. Theearth-faultsupervisioniseitherrealizedinHolm-greenconnectionorbymeansofacore-typecurrenttransformer. 裝置MRM3-2I系列HTL電流互感器輸入3二進制輸入7輸出繼電器4看門狗繼電器1時間過流保護[50/51]是熱模擬[49]是斷路器故障保護[50BF]是負序保護[46]是電動機保護：鎖定轉(zhuǎn)子[51]是電動機保護：不完全啟動[48]是電動機保護：最大啟動次數(shù)[66]是電動機保護：欠電流[37]是電動機保護：熱保護[49]是復位/閉鎖是時間日期是參數(shù)組2故障記錄儀（無丟失）是故障錄波儀是輸出繼電器矩陣是RS485開型數(shù)據(jù)協(xié)議是ModbusRTU協(xié)議可選ProfibusDP可選ANSI:37,46,48,49,50,50BF,51,66IEC:I t;I2 ;IANL;J ,t;I ,I ;CBF;I t ,I t;-