Скачать или смотреть Governor Control System – Basic Training

Here is a basic training summary on the Governor Control System of a steam turbine, especially for systems like Woodward 505 used with Siemens SST-300 turbines:

🔧 Governor Control System – Basic Training (Short)

✅ What is a Governor?

A governor is a control system that regulates turbine speed and load by controlling steam flow to the turbine using a control valve.

⚙️ Main Functions:

Speed Control – Maintains desired turbine RPM.

Load Control – Matches turbine output to grid demand.

Protection – Trips turbine in case of faults.

Startup/Shutdown Sequence – Automates turbine operation.

Limiter Functions – Prevents operation beyond safe limits.

🧩 Key Components:

Speed Sensor (MPU): Detects actual turbine speed.

Controller (e.g., Woodward 505): Compares setpoint and feedback to control output.

Electro-Hydraulic Converter (EHC): Converts electrical signal to hydraulic power.

Actuator: Moves the steam control valve.

Control Valves: Regulate steam flow into the turbine.

🔄 Main Control Loops:

1. Speed Control Loop

Used during startup or island mode.

Compares set speed vs actual speed.

Adjusts valve to match speed.

2. Load Control Loop

Active in grid-connected mode.

Controls turbine MW output.

Adjusts steam flow to match load setpoint.

3. Limiter Loops

Ensure parameters (speed, pressure, temperature) remain within safe limits.

Overrides operator command if limit is exceeded.

4. Auxiliary Inhibit/Input Inhibit Loop

Prevents DCS or manual commands during certain fault or interlock conditions.

Must be enabled for external (DCS) command to work.

🚨 Protections and Trips:

Overspeed protection

Low oil pressure trip

High bearing temperature

Emergency stop button

Manual/automatic trip via 505

📋 Typical Operating Sequence:

Pre-checks → Control power ON

Governor in Manual mode → Speed control

Synchronize to grid

Switch to Auto/Load control mode

Set MW → Governor adjusts valves accordingly