Section 4
1MAC050144-MB C
Protection functions
272
615 series ANSI
Technical Manual
Figure 128:
Load-shedding operation in the “Freq< AND df/dt>” mode when both
Freq< and df/dt conditions are satisfied (Rated frequency=50 Hz)
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 activated as
Freq< AND df/dt
condition satisfied
TRIP
58.5 Hz
Start of operation timer
ST_FRQ
OPR_FRQ
Start of operation timer
1s
Time [s]
Frequency
[Hz]
Содержание 615 Series ANSI
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Страница 389: ...Section 4 1MAC050144 MB C Protection functions 382 615 series ANSI Technical Manual ...
Страница 485: ...Section 6 1MAC050144 MB C Supervision functions 478 615 series ANSI Technical Manual ...
Страница 635: ...Section 10 1MAC050144 MB C Other functions 628 615 series ANSI Technical Manual ...
Страница 707: ...Section 15 1MAC050144 MB C Applicable standards and regulations 700 615 series ANSI Technical Manual ...
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