Schweitzer Engineering Laboratories SEL-321 - Figure 2.38: Loss-Of-Potential Logic

2-74 Specifications Date Code 20011026
SEL-321/321-1 Instruction Manual
LOPD
0
S
O
R
59QL
59PL
50M
ELOP = Y
(Setting)
SPO
LOP
ILOP
ELOP = N1,Y1,Y2
(Setting)
50Q
(Setting)
Loss-of-
Potential
Logic
Enable
Block
3PO
V
1
, I
1
V
0
, I
0
ELOP = Y1,Y2
(Setting)
50QF
50QR
DWG: M321001
Rela
y
Word
Bits
Relay
Word
Bits
* LPVNOM
(Factory Setting)
* See Appendix F
OSB
Figure 2.38: Loss-of-Potential Logic