1MAC050144-MB C
Section 4
Protection functions
615 series ANSI
273
Technical Manual
Figure 129:
Load-shedding operation in the “Freq< AND df/dt>” mode when only the
df/dt condition is satisfied (Rated frequency=50 Hz)
Restore detection
If after the activation of the TRIP input the frequency recovers to a level above the
Restore
pickup Val
setting, the RESTORE
signal
output is activated. The RESTORE output
remains active for a 100 ms. The
Restore mode setting
is used to select the restoring mode
to be "Disabled", "Auto" or "Manual".
60 Hz
Pickup value Freq
set at 0.975 xFn
Pickup value df/dt
set at -0.020 xFn/s
Trip Tm df/dt
= 500ms
Trip Tm Freq
= 1000ms
Load shed mode
= Freq< AND df/dt
58.8 Hz
ST_FRG
OPR_FRG
500ms
1s
TRIP is not activated
in this case as Freq<
condition not satisfied
TRIP
Start of operation timer
Time [s]
Frequency
[Hz]
Содержание 615 Series ANSI
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Страница 707: ...Section 15 1MAC050144 MB C Applicable standards and regulations 700 615 series ANSI Technical Manual ...
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