Schweitzer Engineering SEL-351P - Actively Engage Cold Load Pickup Scheme (Phase Elements Example)

Date Code 990215 Factory-Set Logic 1-9
SEL-351P Manual Técnico
Actively Engage Cold Load Pickup Scheme (Phase Elements Example)
SV6T propagates into
Figure SECTION 1: .2 and seals in with SEL OGIC setting/Relay Word bit
SV8, if Relay Word bit CLP = logical 1 (EZ setting Cold load pickup-phase ≠ OFF). This
actively engages the cold load pickup scheme for the phase overcurrent elements (Relay Word bit
SV8 = logical 1).
SV7PU (=900 cycles from factory) is the
qualifiying time for cold load pickup phase
current below normal Min. trip - phase
SV8
(cold load
pickup
scheme
actively
engaged
for phase
elements)
SV7
PU
0
Loss of load diversity
Restore min. trips
Restore min. trips
scheme enabled for
phase elements
Cold load pickup scheme enabled
for phase elements
Phase current above
normal Min. trip - phase
Cold load pickup phase
current below normal
Min. trip - phase
SV7 SV7T
Relay
Word
Bits
SV6T
SV5T
RPP
CLP
50P6
52A
Recloser closed
DWG: M351R030
SEL OGIC
Setting
Relay
Word
Bit
SEL OGIC
Setting
and
Relay
Word
Bit
Figure SECTION 1: .2: Cold Load Pickup Scheme Seal-in Logic for Phase
Overcurrent Elements