en05000835_ansi.vsd
RESTORE
Voltage
PICKUP
PICKUP
TRIP
Pickup
&
Trip
Output
Logic
BLOCK
Frequency
100 ms
Comparator
If
[PickupFreqGrad<0
AND
df/dt < PickupFreqGrad]
OR
[PickupFreqGrad>0
AND
df/dt > PickupFreqGrad]
Then
PICKUP
Comparator
V < IntBlockLevel
Comparator
f > RestoreFreq
OR
Time integrator
Definite Time Delay
TimeDlyOperate
TimeDlyReset
TimeDlyRestore
BLKDMAGN
Rate-of-Change
of Frequency
BLOCK
BLKTRIP
BLKRESET
ANSI05000835 V1 EN-US
Figure 367: Simplified logic diagram for SAPFRC (81)
10.3.8
Technical data
M14976-1 v10
Table 396: SAPFRC (81) Technical data
Function
Range or value
Accuracy
Trip value, pickup function
(-10.00-10.00) Hz/s
±10.0 mHz/s
Trip value, restore enable frequency
(45.00-65.00) Hz
±2.0 mHz
Definite restore time delay
(0.000-60.000) s
±0.2% or ±100 ms whichever is
greater
Definite time delay for frequency gradient trip
(0.000-60.000) s
±0.2% or ±120 ms whichever is
greater
Definite reset time delay
(0.000-60.000) s
±0.2% or ±250 ms whichever is
greater
1MRK 502 066-UUS B
Section 10
Frequency protection
679
Technical manual
Summary of Contents for Relion 670 series
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