7
Tripping Reliability
IO
N
e
t
C
ro
s
s-
T
ri
p
IO
N
e
t
C
ro
ss
-T
ri
p
IO
N
e
t
C
ro
s
s-
T
ri
p
IO
N
e
t
C
ro
s
s-
T
ri
p
Simpl ex
Non- Redun dant
Simp lex
Non- Red undan t
Dual Redu ndan t
Dual Red und ant
Con troll er
R
Contr ol
V al ves
Contr ol ler
R
Control
Valve s
Control ler
R
S
Con trol
Va lves
1/2
Contr oller
R
S
Co ntrol
Valves
1/2
Tr ip
Sole noid s
Tri p
Sol enoi ds
Trip
S olen oi ds
Tri p
Sole noid s
X
B ackup Tr ip
Protection
X
Y
2/3
Z
Backup Tr ip
Pr o tection
X
Backup Tr ip
Pr otectio n
X
Y
2/3
Z
Backup Tr ip
Pr o tection
R
AN D
Run
X
R
OR
Tri p
X
R
AND
Run
X
Y
MED
Z
R
OR
S
X
AND
Run
R
R
OR
S
X
Y
MED
Z
R
A ND
Run
R
OR
Tr ip
X
Y
MED
Z
OR
S
X
OR
Trip
OR
OR
S
X
Y
MED
Z
Trip
Protection Redundancy, Simplex and Dual Redundant Systems
Turbine control applications have primary and backup trip protection for tripping reliability. The controller and its
corresponding I/O control, protect, and monitor the turbine. Primary protection includes a full set of all trip functions, and
backup protection includes a small subset of the protection functions to backup the primary. Typical backup functions include
emergency overspeed protection, manual- emergency trip, and synch check protection for generator drives. Additional backup
functions can be added as required for specific applications or industry code requirements.
Backup protection is completely separate and independent from the primary protection, including separate power supplies,
processors, and I/O. In addition, the hardware and application software are sufficiently dissimilar from the primary to
dramatically reduce the probability of common mode failures between the primary and backup protection due to common
technology. Backup protection is frequently supplied as triple redundant regardless of the redundancy configuration of the
primary controllers.
Instruction Guide
GEI-100728A
15
Public Information
Summary of Contents for Mark VIe
Page 19: ...Public Information...
