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Operation 4‐9MN2408
Table 4‐17 Generator Protect Setpoints
Overload Threshold for generator overload (in % of Nominal power)
Step: 1% of Nominal power; Range: 0 - 200%
Overload Wrn Threshold for generator overload warning (in % of Nominal power)
Step: 1% of Nominal power; Range: 0 - 200%
Overload del Delay for generator overload alarm. Step: 0.1s; Range: 0 - 60.0 s
Ishort Shutdown occurs when short circuit limit Ishort limit is reached.
Step: 1 % of Nominal current; Range: 100 - 500 %
2Inom del IDMT curve shape selection. 2Inom del is Reaction time of IDMT
protection for 200% overcurrent Igen = 2* Nominal current.
Step: 0,1 s; Range: 0,1 - 20 s
IDMT is “very inverse” generator over current protection. Reaction time is
not constant but depends on generator over current level according
following formula. Reaction time is limited up to 900 sec = 15 minutes.
IDMT protection is not active for Reaction time values longer than 15
minutes.
ReactionĂTimeĂ +
2lnomĂdelĂ *Ă NominĂcurrent
lgenĂ *Ă NominĂcurrent
Curr unbal Threshold for generator current asymmetry (unbalance).
Step: 1% of Nominal current; Range: 1 - 100% of Nominal current
Curr unbal del Delay for generator current assymetry. Step: 0.1 s; Range: 0 - 60.0 s
Gen >V Shutdown level for generator overvoltage. All three phases are checked.
Maximum out of three is used.
Step: 1% of Nominal voltage; Range: Gen >V Wrn -200%
Gen >V Wrn Warning level for generator overvoltage. All three phases are checked.
Maximum out of three is used.
Step: 1% of Nominal voltage; Range: Gen <V Wrn - Gen >V
Gen <V Wrn Warning level for generator under voltage. All three phases are checked.
Minimum out of three is used.
Step: 1% of Nominal voltage; Range: Gen <V - Gen >V Wrn
Gen <V Shutdown level for generator under voltage. All three phases are checked.
Minimum out of three is used.
Step: 1% of Nominal voltage; Range: 0% - Gen <V Wrn
Gen V del Delay for generator under voltage and over voltage alarm
Step: 0.1s; Range: 0 - 60 s
Volt unbal Threshold for generator voltage unbalance alarm.
Step: 1% of Nominal voltage; Range: 0 - 100% of Nominal voltage
Volt unbal del Delay for generator voltage unbalance alarm.
Step: 0.1s; Range: 0 - 60.0 s
Gen >f Shutdown level for generator over frequency.
Step: 0.1% of Nominal frequency; Range: Gen > Wrn - 200.0%
Gen >f Wrn Warning level for generator over frequency.
Step: 0.1% of Nominal frequency; Range: Gen <f Wrn - Gen >V
Gen <f Shutdown level for generator under frequency.
Step: 0.1% of Nominal frequency; Range: 0.0 - Gen <f Wrn
Gen <f Wrn Warning level for generator under frequency.
Step: 0.1% of Nominal frequency; Range: Gen <f - Gen >f Wrn
Gen f del Delay for generator under frequency and over frequency alarm.
Step: 0.1s; Range: 0 - 60.0 s