Alstom SHPM 101 - Power Swing Blocking Characteristic; Power Swing Blocking Logic

SERVICE MANUAL R5888C
QUADRAMHO Chapter 2
Appendix A
Page 52 of 71
Figure 60: Power swing blocking logic
Figure 59: Power swing blocking characteristic
Any Pole
Dead
VTS Block
Current Detector
LDLS
N
Inhibit Power swing
Current Detector
Blocking Opto
LDLS
A
LDLS
B
Current Detector
Z6
AB
Comparator
Any Z1,Z2 or Z3 Comparator
Z3
AB
Comparator
Sw9
0
1
0
240
ms
50ms
R
Q
S
Q
S
R
1
1
1&&
0
&
0
P.S.B Ind
SK TPS
SK2-7
SK2-10
SK PS
95-1
Power Swing Alarm
PSB Z1 Inhibit
PSB Z2 Inhibit
PSB Z3 Inhibit
Inhibit
signal PS
turns off
Inhibit
signal PS
turns on
Power swing
impedance
R
Zone 6
Zone 3
X