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.
装置
MRM3-2I
系列
HTL
电流互感器输入
3
二进制输入
7
输出继电器
4
看门狗继电器
1
时间过流保护 [50/51]
是
热模拟 [49]
是
断路器故障保护 [50BF]
是
负序保护 [46]
是
电动机保护：锁定转子 [51]
是
电动机保护：不*启动[48]
是
电动机保护：启动次数 [66]
是
电动机保护：欠电流 [37]
是
电动机保护：热保护[49]
是
复位 / 闭锁
是
时间日期
是
参数组
2
故障记录仪（无丢失）
是
故障录波仪
是
输出继电器矩阵
是
RS485 开型数据协议
是
Modbus RTU 协议
可选
Profibus DP
可选
ANSI: 37, 46, 48, 49, 50, 50BF, 51, 66
IEC: I I2>; IANL; J>,t; I>,I>>; CBF; I>t>, I>>t; -
