5 PERFORMANCE OF FREQUENCY PROTECTION FUNCTIONS
5.1 BASIC OVERFREQUENCY PROTECTION
Pick-up Setting +/- 5 mHz
Drop-off (Setting - 25 mHz) +/- 5mHz
DT operate* +/- 2% or 50 ms, whichever is greater
Note:
*The operating time also includes the time to track the frequency at 20 Hz per second
5.2 BASIC UNDERFREQUENCY PROTECTION
Pick-up Setting +/- 5 mHz
Drop-off (Setting + 25 mHz) +/- 5mHz
DT operate* +/- 2% or 50 ms, whichever is greater
Note:
*The operating time also includes the time to track the fr
equency at 20 Hz per second
5.3 ADVANCED OVERFREQUENCY PROTECTION
Accuracy
Pick-up Setting +/- 5 mHz
Drop-off (Setting - 25 mHz) +/- 5 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 = start fr
equency – frequency setting
Ff = frequency setting – end frequency
P14x Chapter 23 - Technical Specifications
P14xEd1-TM-EN-1 543
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