Modelling of Steam Turbine and its Governing System

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Governing Control system
Speed Sensing :Mechanical (Fly ball type), Hydraulic (Pump), Electric (toothed Wheel pick up)
MW Transducer for Power
Processing : Hydro mechanical, Electrohydraulic, Digital Electro hydraulic
Amplification: Hydraulic amplifiers in various stages
Actuation: Hydraulic Servomotor
Control Requirements
Start up: To control machine speed for proper synchronization
Normal Operation: To Control MW and To participate in the control of system frequency
Emergency: Load Rejection/Circuit Breaker Opening To restore speed deviation quickly without much transient over speed
Governing system: Technology
Mechanical Hydraulic Control (MHC)
Electro Hydraulic Control (EHC)
Sensing, Processing, primary amplification using electronic circuitry
Transistor version (BHEL/ KWU Siemens Iskamatic modules)
Digital Electro Hydraulic Control (DEHC)
Microprocessor based

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