Advanced Underfrequency Protection; Supervised Rate Of Change Of Frequency Protection; Independent Rate Of Change Of Frequency Protection - GE MiCOM P40 Agile Technical Manual

Chapter 23 - Technical Specifications
5.4

ADVANCED UNDERFREQUENCY PROTECTION

Pick-up
Drop-off
Operating timer
Operating time (Fs/Ff ratio less than 2)
Operating time (Fs/Ff ratio between 2 and 6)
Operating time (Fs/Ff ratio greater than 6)
Reset time
Reference conditions: Tested using step changed in frequency with Freq. Av Cycles setting = 0 and no intentional
time delay.
Fs = start frequency – frequency setting
Ff = frequency setting – end frequency
5.5

SUPERVISED RATE OF CHANGE OF FREQUENCY PROTECTION

Pick-up (f)
Pick-up (df/dt)
Drop-off (f, underfrequency)
Drop-off (f, overfrequency)
Drop-off (df/dt, falling, for settings between 10 mHz/s and
100 mHz/s)
Drop-off (df/dt, falling, for settings greater than 100 mHz/s)
Drop-off (df/dt, rising, for settings between 10 mHz/s and
100 mHz/s )
Drop-off (df/dt, rising, for settings greater than 100 mHz/s)
Instantaneous operating time (Freq AvCycles setting = 0)
Reset time time (df/dt AvCycles setting = 0)
5.6

INDEPENDENT RATE OF CHANGE OF FREQUENCY PROTECTION

Pick-up (df/dt)
Drop-off (df/dt, falling, for settings between 10 mHz/s and
100 mHz/s)
544
Accuracy
Setting +/- 5 mHz
(Setting + 25 mHz) +/- 5 mHz
+/- 2% or 50 ms, whichever is greater
Operating and Reset time
<125 ms
<160 ms
<230 ms
<200 ms
Accuracy
Setting +/- 10 mHz
Setting +/- 3% or +/- 10 mHz/s, whichever is greater
(Setting + 20 mHz) +/- 10 mHz
(Setting - 20 mHz) +/- 10 mHz
(Setting + 5 mHz/s) +/- 10 mHz/s
(Setting + 50 mHz/s) +/- 5% or +/- 55 mHz/s, whichever is
greater
(Setting - 5 mHz/s) +/- 10 mHz/s
(Setting - 50 mHz/s) +/- 5% or +/- 55 mHz/s, whichever is
greater
Operating and Reset time
Accuracy
Setting +/- 3% or +/- 10 mHz/s, whichever is greater
(Setting + 5 mHz/s) +/- 10 mHz/s
<125 ms
<400 ms
P14x
P14xEd1-TM-EN-1