Schweitzer Engineering Laboratories SEL-421-4 - Table 8.71 Synchronism-Check Element Reference; Table 8.72 Breaker 1 Synchronism Check; Table 8.73 Breaker 2 Synchronism Check

8.29
Date Code 20171021 Instruction Manual SEL-421 Relay
Settings
Group Settings
Make Table 8.71 settings if Group settings E25BK1 := Y or E25BK2 := Y.
Make Table 8.72 settings if Group setting E25BK1 := Y.
NOTE: If the relay is using a remote
data acquisition system, such as TiDL,
the operating times will be delayed by
1.5 ms. Use caution when setting the
relay for synchronism check to
account for this added delay
Make Table 8.73 settings if Group setting E25BK2 := Y.
FOPU1 Flashover Time Delay—BK1 (0.000–6000 cycles) 9.000 9.000 0.125
BLKFOA1 Block A-Phase Flashover—BK1 (SEL
OGIC Equation) NA NA
BLKFOB1 Block B-Phase Flashover—BK1 (SEL
OGIC Equation) NA NA
BLKFOC1 Block C-Phase Flashover—BK1 (SEL
OGIC Equation) NA NA
BFTR1 Breaker Failure Trip—BK1 (SEL
OGIC Equation) NA NA
BFULTR1 Breaker Failure Unlatch Trip—BK1 (SEL
OGIC Equation) NA NA
a
Replace 1 with 2 in the setting for Breaker 2.
b
Setting only available when EBFL1 := 2, Y2 or EBFL2 := 2, Y2.
Table 8.70 Breaker 1 Failure Logic (and Breaker 2 Failure Logic
a
) (Sheet 2 of 2)
Setting Prompt
Default Value
Increment
5 A 1 A
Table 8.71 Synchronism-Check Element Reference
Setting Prompt
Default
Value
Increment
SYNCP Synchronism Reference (VAY, VBY, VCY, VAZ, VBZ,
VCZ)
VAY
25VL Voltage Window Low Threshold (20.0–200 V secondary) 55.0 0.1
25VH Voltage Window High Threshold (20.0–200 V secondary) 70.0 0.1
Table 8.72 Breaker 1 Synchronism Check
Setting Prompt
Default
Value
Increment
SYNCS1 Synchronism Source 1 (VAY, VBY, VCY, VAZ, VBZ,
VCZ)
VA Z
KS1M Synchronism Source 1 Ratio Factor (0.10–3) 1.00 0.01
KS1A Synchronism Source 1 Angle Shift (0, 30, 60, 90, 120,
150, 180, 210, 240, 270, 300, 330 degrees)
030
25SFBK1 Maximum Slip Frequency—BK1 (OFF, 0.005–0.5 Hz) 0.050 0.001
ANG1BK1 Maximum Angle Difference 1—BK1 (3.0–80 degrees) 10.0 0.1
ANG2BK1 Maximum Angle Difference 2—BK1 (3.0–80 degrees) 10.0 0.1
TCLSBK1 Breaker 1 Close Time (1.00–30 cycles)
a
a
Adjust setting TCLSBK1 in 0.25-cycle steps.
8.00 0.25
BSYNBK1 Block Synchronism Check—BK1(SEL
OGIC Equation) NA
Table 8.73 Breaker 2 Synchronism Check (Sheet 1 of 2)
Setting Prompt
Default
Value
Increment
SYNCS2 Synchronism Source 2 (VAY, VBY, VCY, VAZ, VBZ,
VCZ)
VBZ
KS2M Synchronism Source 2 Ratio Factor (0.10–3) 1.00 0.01
KS2A Synchronism Source 2 Angle Shift (0, 30, 60, 90, 120,
150, 180, 210, 240, 270, 300, 330 degrees)
030