Alstom SHPM 101 - Guard Zone Logic; Quadrilateral Zone 3

SERVICE MANUAL R5888C
QUADRAMHO Chapter 2
Appendix A
Page 48 of 71
Figure 54: Quadrilateral Zone 3
Figure 53: Guard Zone logic
IX
IZ
IZ'
A
1
= V – IZ
B
1
= I
PH
R + I
N
R
A
3
= –IZ
B
3
= V+ IR
A
2
= V – IR
B
2
= –IZ
–IR
θ
A
5
= I
PH
R + I
N
R
B
5
= V+IZ'
INHIBIT ZONE 1 A-G
INHIBIT ZONE 1 B-G
INHIBIT ZONE 1 C-G
&
&
&
&
&
&
EX.OR
GUARD ZONE A
POLE DEAD A
GUARD ZONE B
POLE DEAD B
GUARD ZONE C
POLE DEAD C