Tripping Reliability - GE Mark VIe Instruction Manual

7 Tripping Reliability

Simpl ex
Non- Redun dant
Con troll er
Contr ol
R
V al ves
Tr ip
Sole noid s
X
B ackup Tr ip
Protection
R
Run
AN D
X
R
Tri p
OR
X
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
Simp lex
Non- Red undan t
Contr ol ler
Control
R
Valve s
Tri p
Sol enoi ds
X
2/3
Y
Z
Backup Tr ip
Pr o tection
R Run
AND
X
Y
MED
Z
R Tr ip
OR
X
Y
MED
Z
Protection Redundancy, Simplex and Dual Redundant Systems
Public Information
Dual Redu ndan t
Control ler
Con trol
R
S Va lves
1/2
Trip
S olen oi ds
X
Backup Tr ip
Pr otecti o n
R R
OR
S
X Run
AND
R R
OR
S S
X
X Trip Y
OR
Dual Red und ant
Contr oller
Co ntrol
R
S Valves
1/2
Tri p
Sole noid s
X
2/3
Y
Z
Backup Tr ip
Pr o tection
OR Run
A ND
S
X
Y
MED
Z
Trip
OR OR
MED
Z
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