Woodward MRM4, Manual, Page: 436 / 460

Tolerances
Earth current stages: IG[x] Tolerance
IG> ±1.5% of the setting value resp. 1% In
Resetting ratio 97% or 0.5% x In
t DEFT
±1% resp. ±10 ms
Operating time
Starting from IG higher than 1.1 x IG>
<35 ms
Release time <45 ms
t-char ±5% IEC NINV, IEC VINV, IEC LINV, IEC EINV, ANSI
MINV, ANSI ANSI VINV, ANSI EINV, Therm Flat, IT,
I2T, I4T
t-reset
Only available if: Characteristic = INV
±1% resp. ±10 ms
Negative phase sequence current: I2[x] Tolerance
I2 ±2% of the setting value resp. ±1% In
Resetting ratio 97% or 0.5% x In
t
Tripping delay time (DEFT)
DEFT
±1% resp. ±10 ms
Operating time
Starting from I2 higher than 1.1 x I>
<65 ms
Release time <45 ms
Thermal Replica: ThR Tolerance
Ib ±2% of the setting value resp. 1% In
Alarm ThR ±1.5 % of the setting value
Unbalanced load :I2>[x] Tolerance
I2> ±2% of the setting value resp.1% In
Resetting ratio 97% or 0.5% x In
t DEFT
±1% resp. ±10 ms
Operating time
Starting from I2 higher than 1.3 x I2>
<65 ms
Release time <45 ms
k ±5% INV
τ-cool ±5% INV
Page 436 EN MRM4 01/11