Sel SEL-421 - Pole Open Logic Diagram

R.1.22
SEL-421 Relay Reference Manual Date Code 20111215
Protection Functions
Pole Open Logic
Figure 1.15 Pole Open Logic Diagram
LOPHA
(Relay Word Bit)
52AA1
52AA2
SPOA SPOB SPOC
0
3POD
0
SPOD
SPO 3PO
RESET
+
VA
(Setting) 27PO
27APO
(Relay Word Bit)
(Setting) EPO := V
SPOA
Relay
Word
Bits
SPOB
SPOC
NUMBK = 2
BK2TYP = 1
BK1TYP = 1
(Setting) EPO := 52
Identical Logic for B- and C- Phases
Relay
Word
Bits
(Control
Inputs)
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