Turbine & Boiler Trip / Protection System
ETS, MFT, voting logic, trip simulator, and trip history — universal across plant type and OEM. Reference values below are generic, illustrative industry-typical figures for education, not sourced from a specific manufacturer's proprietary manual; your own entered plant data always takes precedence.
Affects which parameters apply below — e.g. boiler type filters drum-only vs once-through-only entries, and steam-condition setpoints (pressure/temperature) scale by plant type.
Enter a current value AND how long it has been held there, then click its Submit button (or press Enter) — a real protection system doesn't trip on a single instantaneous reading, it requires the value to persist past its trip setpoint for at least the time delay shown (editable per row) before the trip actually latches. Each row evaluates independently.
| Parameter | Category | Value | Held for (s) | Time delay (s) | Alarm | Trip | Status | Data type | |
|---|---|---|---|---|---|---|---|---|---|
| Turbine Speed (Overspeed) | Turbine Mechanical | % rated speed | 103 | 110 | NORMAL | Public Reference | |||
| Shaft Vibration | Turbine Mechanical | µm (pk-pk) | 180 | 250 | NORMAL | Public Reference | |||
| Axial (Thrust) Displacement | Turbine Mechanical | mm | 0.6 | 0.9 | NORMAL | Public Reference | |||
| Bearing Metal Temperature | Turbine Mechanical | °C | 105 | 115 | NORMAL | Public Reference | |||
| Exhaust Hood Temperature | Turbine Mechanical | °C | 90 | 120 | NORMAL | Public Reference | |||
| Rotor/Casing Differential Expansion | Turbine Mechanical | mm | 4 | 6 | NORMAL | Public Reference | |||
| Lube Oil Pressure | Turbine Mechanical | bar | 0.9 | 0.6 | NORMAL | Public Reference | |||
| EHC / Control Oil Pressure | Turbine Mechanical | bar | 90 | 70 | NORMAL | Public Reference | |||
| Water Induction Protection | Turbine Mechanical | boolean | 1 | 1 | NORMAL | Public Reference | |||
| Manual Emergency Trip Pushbutton | Turbine Mechanical | boolean | 1 | 1 | NORMAL | Public Reference | |||
| Condenser Pressure (Vacuum Loss) | Steam Conditions | kPa | 20 | 30 | NORMAL | Public Reference | |||
| Main Steam Temperature HIGH | Steam Conditions | °C | 555 | 565 | NORMAL | Public Reference | |||
| Main Stop Valve Position Disagreement | Valve Protection | boolean | 1 | 1 | NORMAL | Public Reference | |||
| Generator Differential Protection | Generator/Electrical | boolean | 1 | 1 | NORMAL | Public Reference | |||
| Reverse Power | Generator/Electrical | % rated MW | -0.5 | -2 | NORMAL | Public Reference | |||
| Loss of Synchronism | Generator/Electrical | boolean | 1 | 1 | NORMAL | Public Reference | |||
| Loss of Excitation (40) | Generator/Electrical | boolean | 1 | 1 | NORMAL | Public Reference | |||
| Negative Sequence / Unbalanced Current (46) | Generator/Electrical | % I2/IN | 8 | 10 | NORMAL | Public Reference | |||
| Loss of Critical Instrument Power | Other | boolean | 1 | 1 | NORMAL | Public Reference | |||
| Trip Oil Pressure LOW | Turbine Mechanical | bar | 6 | 4.5 | NORMAL | Public Reference | |||
| Gland/Seal Steam Pressure LOW | Turbine Mechanical | bar | 0.05 | 0.02 | NORMAL | Public Reference | |||
| HP/IP Casing Top-Bottom Temperature Differential HIGH | Turbine Mechanical | °C | 25 | 40 | NORMAL | Public Reference | |||
| Turbine Control System (DEH/ETS Processor) Failure | Other | boolean | 1 | 1 | NORMAL | Public Reference | |||
| Generator Bearing Vibration HIGH-HIGH | Turbine Mechanical | µm | 125 | 200 | NORMAL | Public Reference | |||
| Extraction/Bleed Steam Non-Return Valve Fail-to-Close | Turbine Mechanical | boolean | 1 | 1 | NORMAL | Public Reference | |||
| TSI: Casing/Frame Vibration HIGH-HIGH (seismic) | Turbine Mechanical | mm/s RMS | 7.1 | 11.2 | NORMAL | Public Reference | |||
| TSI: Shaft Eccentricity HIGH | Turbine Mechanical | µm pk-pk | 40 | 65 | NORMAL | Public Reference |
Enter a current value per parameter and click Evaluate — this simulates live status against the configured setpoints. A value past its trip setpoint shows TRIP PENDING until the held-for duration reaches the time delay, then TRIP.
About This Calculation
A real turbine-boiler-generator (BTG) unit is protected by dozens of overlapping systems, not one: the Emergency Trip System (ETS) protects the turbine-generator itself (overspeed, low vacuum, high vibration, thrust bearing failure), the Master Fuel Trip (MFT) protects the boiler (flame failure, low drum level, furnace pressure excursion), and dozens of individual auxiliary-drive interlocks and permissives sit underneath both. This registry models that structure directly — organized by ETS/MFT/auxiliary-drive category, each parameter tagged by data source (a defensible public-reference value, your own entered plant data, or a live simulated value) so it is always clear whether a number shown is a generic illustration or something you configured yourself.