GE P24DM - Performance of Frequency Protection Functions; Overfrequency Protection; Underfrequency Protection; Supervised Rate of Change of Frequency Protection

5 PERFORMANCE OF FREQUENCY PROTECTION FUNCTIONS
5.1 OVERFREQUENCY PROTECTION
Accuracy
Pick-up Setting +/- 10 mHz
Drop-off Setting -20 mHz +/- 10 mHz
Operating timer +/- 2% or 50 ms, whichever is greater
Operating and Reset time
Operating time (Fs/Ff ratio less than 2) <125 ms
Operating time (Fs/Ff ratio between 2 and 30) <150 ms
Operating time (Fs/Ff ratio greater than 30) <200 ms
Reset time <200 ms
Reference conditions: Tested using step changed in frequency with Freq. Av Cycles setting = 0 and no intentional
time delay.
Fs = star
t frequency – frequency setting
Ff = frequency setting – end frequency
5.2 UNDERFREQUENCY PROTECTION
Accuracy
Pick-up Setting +/- 10 mHz
Drop-off Setting + 20 mHz +/- 10 mHz
Operating timer +/- 2% or 50 ms, whichever is greater
Operating and Reset time
Operating time (Fs/Ff ratio less than 2) <100 ms
Operating time (Fs/Ff ratio between 2 and 6) <160 ms
Operating time (Fs/Ff ratio greater than 6) <230 ms
Reset time <200 ms
Reference conditions: Tested using step changed in frequency with Freq. Av Cycles setting = 0 and no intentional
time delay.
Fs = star
t frequency – frequency setting
Ff = frequency setting – end frequency
5.3 SUPERVISED RATE OF CHANGE OF FREQUENCY PROTECTION
Accuracy
Pick-up (f) Setting +/- 10 mHz
Pick-up (df/dt) Setting +/- 3% or +/- 10 mHz/s, whichever is greater
P24xM Chapter 21 - Technical Specifications
P24xM-TM-EN-2.1 441