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脱扣特 性
Tripping
Characteri
stics
注:动作曲线符合 tr=(2Ir)
2
×Tr/I
2
tr:过载长延时动作时间 Tr:过载长延时动作时间整定值
I:实际运行电流 Ir:过载长延时动作电流整定值
Note:Curve is satisfied tr=(2Ir)
2
×Tr/I
2
tr: Overload long-time delay time Tr: Overload long-time delay setting time
I:working current Ir: Overload long-time delay setting current
2)过载长延时具有热记忆功能,在产品脱扣后的 30min(NDM3EU-225)/20min(NDM3EU-400)内有效
(NDM3EU-225 需要 DC24V 辅助电源)
当第一次脱扣的能量是 QT =(2 * Ir)
2
* T 时,T 是行程时间。 能量 Q1 在间隔 T1 = QT×T1 / Tthm
时损失,第二次脱扣所需的能量为 Q0,即第二次脱扣时间为 t =(QT-Q1)/(2 * Ir)
2
; 有关热记忆功能,
请联系制造商
The overload long delay has a thermal memory function, which can be activated 30minutes (NDM3EU-225)
/ 20 minutes (NDM3EU-400) after the tripping of the circuit breaker .(NDM3EU-225 requires DC24V auxiliary
power supply to realize this function).
When the energy of the first trip is QT = (2 * Ir)
2
* T, T is the trip time. The energy Q1 lost at interval T1 =
QT×T1/Tthm, the energy required for the second trip is Q0, that is, the second trip time is t = (QT - Q1) / (2* Ir)
2
;
For thermal memory function, please contact the manufacturer.
3)短路短延时保护(见表 6)Short circuit short-time delay protection (Table 6)
短延时保护防止配电系统的阻抗性短路。分成两段:反时限段,定时限段。
Short circuit short-time delay protection is used to prevent short cirtuit of power distribution system,which is
divided into two parts: inverse time and fixed time
表 6 Table6
脱扣特性
Tripping
Characteristics
反时限 Inverse time
Is≤I<1.5Is