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(jìn)制輸入7輸出繼電器4看門狗繼電器1時(shí)間過流保護(hù)[50/51]是熱模擬[49]是斷路器故障保護(hù)[50BF]是負(fù)序保護(hù)[46]是電動(dòng)機(jī)保護(hù)：鎖定轉(zhuǎn)子[51]是電動(dòng)機(jī)保護(hù)：不完全啟動(dòng)[48]是電動(dòng)機(jī)保護(hù)：最大啟動(dòng)次數(shù)[66]是電動(dòng)機(jī)保護(hù)：欠電流[37]是電動(dòng)機(jī)保護(hù)：熱保護(hù)[49]是復(fù)位/閉鎖是時(shí)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;-