IS200TRPAH2AFD is a turbine trip terminal board produced by GE Company. It is part of the Speedtronic Mark VIe control system and is mainly used for protection and control of high-speed rotating equipment such as gas turbines and steam turbines.
Core functions and features
Three-out-of-Two Voting Logic:
The module performs hardware-level three-out-of-two (2oo3) voting on three independent trip/protective signals (such as overspeed, low oil pressure, high vibration).
Only when at least two signals simultaneously trigger a dangerous state, will a safety interlock command be output to avoid false tripping or refusal due to a single sensor failure.
Compliant with IEC 61508 SIL2 functional safety standard, ensuring reliable operation even under extreme conditions.
Fast response capability:
Response time ≤ 10ms, meeting the real-time requirements for scenarios such as emergency shutdown of gas turbines.
Input/output compatibility:
Supports dry contacts (NO/NC) or 24VDC active signal input, compatible with mainstream sensor and relay output levels.
The output is safety relay contacts (Form C, SPDT), with a rated 250VAC / 2A, capable of directly driving the trip solenoid valve, shortening the action path.
High reliability and isolation design:
Strong isolation of ≥1.5kV between channels and on the input/output side, preventing common-mode interference from causing false actions.
Modular design, facilitating installation and maintenance.
Status indication and self-diagnosis:
Each channel is equipped with an LED indicator (green = normal, red = fault/inconsistent), and the panel provides a “Vote OK” integrated status light.
Supports fault injection testing and voting logic verification to ensure that the module behaves in accordance with safety specifications under abnormal conditions.
Technical Specifications
Input channels: 3 independent protection signals (Channel A/B/C)
Input voltage range: 0–30VDC
Output type: Safety relay contacts (250VAC / 2A)
Operating temperature: -20°C to +70°C
Protection level: IP54 (dust and water protection)
Certification standards: IEC 61508 SIL2, UL 61010-1, CE EMC Directive
Application scenarios
Over-speed protection:
Receive three independent speed probe signals. When any two exceed 110% of the rated speed, trigger an emergency shutdown to prevent equipment damage.
Oil pressure monitoring:
Monitor three oil pressure switch signals. After three-out-of-two voting, control the main fuel valve to close to avoid bearing dry friction damage.
Electrical fault isolation:
Integrate differential protection, reverse power and other relay outputs to achieve mechanical rapid decoupling in the event of electrical faults.
Unattended operation:
In environments with limited space and difficult maintenance, rely on its high reliability to achieve unattended safe operation.
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