Schweitzer Engineering SEL-351P - Page 168

iv Overcurrent, Voltage, Synchronism Check, and Frequency Elements Date Code 990430
SEL-351P Manual Técnico
Figure 3.24: Synchronism Check Voltage Window and Slip Frequency Elements ................................3-37
Figure 3.25: Synchronism Check Elements.............................................................................................
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Figure 3.26: Angle Difference Between V
P
and V
S
Compensated by Breaker Close Time (f
P
< f
S
;
V
P
shown as reference in this example).......................................................................3-42
Figure 3.27: Undervoltage Block for Frequency Elements .....................................................................
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Figure 3.28: Levels 1 through 6 Frequency Elements.............................................................................
3-47