GE Mark VIe - Tripping Reliability

7 Tripping Reliability
IONet
Cross-Trip
IONet
Cross-Trip
IONet
Cross-Trip
IONet
Cross-Trip
Simplex
Non-Redundant
Simplex
Non-Redundant Dual Redundant Dual Redundant
Controller
R
Control
Valves
Controller
R
Control
Valves
Controller
R
S
Control
Valves
1/2
Controller
R
S
Control
Valves
1/2
Trip
Solenoids
Trip
Solenoids
Trip
Solenoids
Trip
Solenoids
X
Backup Trip
Protection
X
Y
2/3
Z
Backup Trip
Protection
X
Backup Trip
Pr otection
X
Y
2/3
Z
Backup Trip
Pro tection
R
AND
Run
X
R
OR
Trip
X
R
AND
Run
X
Y
MED
Z
R
OR
S
X
AND
Run
R
R
OR
S
X
Y
MED
Z
R
AND
Run
R
OR
Trip
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
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