Schweitzer Engineering SEL-351P - Voltage Elements; Voltage Element Settings

Date Code 990430 Overcurrent, Voltage, Synchronism Check, and Frequency Elements 3-29
SEL-351P Manual Técnico
V OLTAGE E LEMENTS
Enable numerous voltage elements by making the enable setting:
EVOLT = Y
Voltage Values
The voltage elements operate off of various voltage values shown in
Table SECTION 3: .7.
Table SECTION 3: .7: Voltage Values Used by Voltage Elements
Voltage Description
V
A
A-phase voltage, from SEL-351P rear-panel voltage input VA
V
B
B-phase voltage, from SEL-351P rear-panel voltage input VB
V
C
C-phase voltage, from SEL-351P rear-panel voltage input VC
V
AB
Phase-to-phase voltage
V
BC
Phase-to-phase voltage
V
CA
Phase-to-phase voltage
3V
0
Zero-sequence voltage
V
2
Negative-sequence voltage
V
1
Positive-sequence voltage
V
S
Synchronism check voltage, from SEL-351P rear-panel voltage input VS*
*Voltage V
S
is used in the synchronism check elements described in the following subsection
Synchronism Check Elements. Voltage V
S
is also used in the three voltage elements described
at the end of
Table SECTION 3: .8 and Figure SECTION 3: .26. These voltage elements are
independent
of the synchronism check elements, even though voltage V
S
is used in both.
Voltage Element Settings
Table SECTION 3: .8 lists available voltage elements and the corresponding voltage inputs and
settings ranges.