Alstom SHPM 101 - Block Diagram

SERVICE MANUAL R5888C
QUADRAMHO Chapter 2
Appendix A
Page 4 of 71
Figure 4: Block diagram
Voltage Memory
Amplitude Hysteresis
Memory Available
Clock Pulses V
POL
V±IR
V
a
V
b
V
c
V
n
Voltage
Inputs
Zone1/2
Polarise
Zone 1
Setting
Zone 1X
Setting
Zone 2
Setting
Zone 3
Polarise
Zone 3
Setting
Level
Detector
Circuits
Current
Inputs
I
a
I
b
I
c
I
n
Opto
Outputs
Signalling Equipment etc.
Phase
and
Neutral
Setting
IR
IZ
Zone 1X
Control
ZONE
1
comparators
ZONE
2
comparators
ZONE
3
comparators
Z1 Z2 Z3
LED
Indication
Auxillary Relay
Output
Contacts
V–IZ(Z1)
V–IZ(Z3)
V–IZ∠
•
(180–Φ)
V–IZ∠
•
Φ
V–IZ(Z6)
Zone 1Extension
Zone 1Inhibits
Self test
Reset
MICROCOMPUTER SOFTWARE LOGIC FOR: All Schemes Schemes Timers Scheme Options Comparator Level detector Checks Pole Dead Logic SOTF VTS Power Swing Blocking Voltage Memory Voltage Bandpass Filter Select Indications Block Auto-Reclose Logic Fault Locator, Trip and Alarm Outputs Self-test and other Test Options
Z6
Bandpass Filter Switching
V–IZ(Z2)