Alstom SHPM 101 - Principle of Zone 1 Reach Line Angular Compensation

SERVICE MANUAL R5888B
QUADRAMHO Chapter 1
Appendix A
Page 2 of 8
Pre-fault power flow
R
A
B
jx
KRF
R
a) Preventing Zone 1 overreach
F
A
X
XX
R
Pre-fault power flow
XX
A
R
F
A
B
jx
KRF
R
b) Preventing Zone 1 underreach
X
R
Figure 2: Principle of Zone 1 reach line angular compensation