The motor protection relay MRM3-2 offers reliable protection for LV and MV motors which are ei-
ther operated via power contactors or power circuit breakers. The following functions are integrated into this relay:
? Overload protection acc. to IEC 255-8 in consideration of the initial load factor (thermal image) ? Definite undercurrent protection ? Definite time over current protection (DMT) ? Inverse time over current protection (IMT) with select-able trip characteristics ? Short-circuit protection ? Load unbalance supervision with definite or inverse trip characteristics ? Earth-fault detection with suppression of harmonics
The MRM3-2 recognizes the “Start-Up“ and “Motor Running“ phase.
Motors with a limited number of starts can be controlled by the start limiting function of the relay.
The earth-fault supervision is either realized in Holm-green connection or by means of a core-type
current transformer.
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:鎖定轉子 [51]
是
電動機保護:不*啟動[48]
是
電動機保護:啟動次數 [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 開型數據協議
是
Modbus RTU 協議
可選
Profibus DP
可選
ANSI: 37, 46, 48, 49, 50, 50BF, 51, 66
IEC: I I2>; IANL; J>,t; I>,I>>; CBF; I>t>, I>>t; -