t(s) Trip time in seconds
d
M
Excitation value (V/f ratio or volts/hertz) in pu
k
Time multiplier setting
GUID-6FC7624E-7E13-4645-8943-0FDFBAA1D184 V1 EN
Figure 121:
Trip time curves for the overexcitation IDMT curve 4 ("OvExt IDMT Crv4")
for different values of the Time multiplier setting when the Constant delay
is 800 milliseconds
The activation of the
TRIP
output activates the
BLK_RESTART
output.
For the IDMT characteristic "OvExt IDMT Crv4", the deactivation of the
TRIP
output
activates the cooling timer. The timer is set to the value entered in the
Cooling time
setting.
The
COOL_ACTIVE
output is kept active until the cooling timer is reset, whereas the
BLK_RESTART
output remains active until the timer exceeds the value to enable the
restart time, given in
. The
Restart Ena level
setting determines the level when
BLK_RESTART
should be released.
Section 4
1MRS240050-IB C
Protection functions
254
REF615R
Technical Manual
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