Schweitzer Engineering Laboratories SEL-351 - Synchronism Check Elements Voltage Inputs

3-42 Overcurrent, Voltage, Synchronism Check, Frequency, and Power Elements Date Code 20001006
SEL-351 Instruction Manual
Figure 3.27: Synchronism Check Elements
Synchronism Check Elements Voltage Inputs
The two synchronism check elements are single-phase elements, with single-phase voltage inputs
V
P
and V
S
used for both elements:
V
P
Phase input voltage (V
A
, V
B
, or V
C
for wye-connected voltages; V
AB
, V
BC
, V
CA
for delta-
connected voltages), designated by setting SYNCP (e.g., if SYNCP = VB, then V
P
= V
B
)
V
S
Synchronism check voltage, from SEL-351 Relay rear-panel voltage input VS
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