Woodward MRM4, Manual

Page: 318 / 460

Protective Elements
Parameter Description Setting range Default Menu path
%(I2/I1) The %(I2/I1) setting is the
unbalance trip pickup
setting. It is defined by
the ratio of negative
sequence current to
positive sequence current
(% Unbalance=I2/I1), or
%(I2/I1) for ABC rotation
and %(I1/I2) for ACB
rotation.
Only available if: %(I2/I1)
= use.
2 - 40% 20% [Protection Para
/<n>
/I-Prot
/I2>[1]]
Char Characteristic DEFT,
INV
DEFT [Protection Para
/<n>
/I-Prot
/I2>[1]]
t Tripping delay
Only available if:
Characteristic = DEFT.
0.00 - 300.00s 0.00s [Protection Para
/<n>
/I-Prot
/I2>[1]]
K Indicates the thermal
load capability of the
engine while running with
100% unbalanced load
current.
Only available if:
Characteristic = INV.
1.0 - 200.0 10.0 [Protection Para
/<n>
/I-Prot
/I2>[1]]
τ-cool If the unbalanced load
current falls below the
pickup value, the cooling-
off time is taken into
account. If the
unbalanced load exceeds
the pickup value again,
than the saved heat
within the electrical
equipment will lead to an
accelerated trip.
Only available if:
Characteristic = INV.
0.0 - 60000.0 0.0 [Protection Para
/<n>
/I-Prot
/I2>[1]]
Page 318 EN MRM4 01/11