簡單介紹
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.
MRM3-2I裝置 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 電動機(jī)保護(hù):鎖定轉(zhuǎn)子 [51] 是 電動機(jī)保護(hù):不*啟動[48] 是 電動機(jī)保護(hù):啟動次數(shù) [66] 是 電動機(jī)保護(hù):欠電流 [37] 是 電動機(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 Modbus RTU 協(xié)議 可選 Profibus DP 可選 ANSI:
37,
46,
48,
49,
50,
50BF,
51,
66IEC:
I
IANL;
J>,t;
I>,I>>;
CBF;
I>t>, I>>t;
-