What are the differences between load , speed and cascade mode.explain about turbine ESV and uses
Emergency stop valve( ESV) used to quick interruption of steam flow to the turbine during turbine trip. opening and closing of ESV depends on parameters like
- Steam temperature
- Steam pressure
- Turbine running on barring gear
- Control and lube oil pressure
When these parameters are achieved the solenoid valves energies and give the command to ESP actuator to open the valve. Hence steam enters to the control valve casing. if desired parameters are not achieved or during emergency trip suddenly solenoid valves are de-energized and shuts the ESV.