InteliLite Global Guide
196
Setpoint group Generator settings Related FW 1.2.1
Range [units] 1,0 .. 60,0 [s]
Default value 4,0 s Alternative config NO
Step 0,1 s
Comm object 8283 Related applications AMF, MRS
Config level Standard
Setpoint visibility Always
Description
IDMT curve shape selection. Description (page 196) is a reaction time of IDMT protection for 200%
overcurrent I
gen
=2*Nominal Current (page 156)
IDMT is “very inverse” generator over current protection. Reaction time is not constant but depends on
generator over current level according to the following formula:
Reaction time =
Overcurrent IDMT Delay Nominal Current
I Nominal Current
*
gen
Note: Reaction time is limited to 3600 s = 60 minutes. IDMT protection is not active for Reaction time
values longer than 60 minutes.
I
gen
is maximal value of all measured phases of generator current.
Table 8.1 EXAMPLE of Reaction time for different over current levels
Overcurrent IDMT Delay
Overcurrent
≤ 100 % 101 % 110 %
Reaction time 0,2 s No action 20 s 2 s
2 s No action 200 s 20 s
20 s No action 2000 s 200 s
Image 8.19 IDMT Overcurrent Delay
IDMT Overcurrent Delay
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