Turbine governing steam turbines

TURBINE GOVERNING SYSTEM PRESENTATION BY M DEENADAYALAN C M NIKHIL B VASANTH KUMAR TOPICS OF DISCUSSION  INTRODUCTION  CONCEPT OF GOVERNING SYSTEM  FEATURES OF KWU GOVERNING SYSTEM  GOVERNING SYSTEM DEVICES  WORKING OF GOVERNING SYSTEM  HYDRAULIC AND ELECTROHYDRAULIC SYSTEM  PROTECTIVE DEVICES IN GOVERNING SYSTEM  QUERIES WHAT IS GOVERNING SYSTEM ?  Turbine Governing system is meant for regulation of turbine speed under no load and varying load condition  To regulate the steam control valve position and hence load generated  To control the initial run up and synchronization of the machine  To assist in matching the power generated to that demanded by responding to the network frequency changes SALENT FEATURES OF 200 MW KWU TURBINE GOVERNING SYSTEM      KWU 200 MW turbine is a throttle governed machine Two governors, electro-hydraulic and hydraulic are incorporated Both the governors are connected in parallel Only one governor can be selected at a time through the process of hydraulic minimum selection The control valve opening depends on secondary oil pressure and there is a definite relationship between the opening of HP control valve and IP control valve Between 40 to 200MW the turbine load is varied by changing the HP control valve throttling alone HYDRAULIC GOVERNOR SALIENT FEATURES       Hydraulic governor is having only one control loop called speed controller Machine speed is measured and indicated as primary oil pressure Range of speed control is 2800-3210 rpm Speed regulation range (droop) of HG is 7% HG acts as a back-up to the EHG HG can not be isolated mechanically like EHG and HG is considered to be the primary governor of the KWU turbine ELECTRO-HYDRAULIC GOVERNOR SALIENT FEATURES        EHG consists of three control loops for speed, load and pressure EHG optimizes the turbine life by conservative operation with the aid of TSE Faster response and precise frequency control Actual speed of the turbine is measured by using hall probes Range of speed control is wider (0-3210) rpm Speed regulation (Droop) can be changed from 2.5% to 8% in a step of 0.5% even when the machine runs on load The usual setting of droop in EHG is 5% EHG can be mechanically isolated by closing the secondary oil line from the local GOVERNING SYSTEM DEVICES  Remote trip solenoids  Follow-up piston  Turbine trip gear  Hydraulic amplifier (Main trip valve)  Electro-hydraulic  convertor Starting and load limiting device  Sequence trimming device  Speeder gear  Solenoid for load shedding  Auxiliary follow-up piston relay DIFFERENT OILS USED IN KWU TURBINE  Control oil (source oil)  Auxiliary secondary oil  Auxiliary start-up oil  secondary oil  Start-up oil  Test oil  Auxiliary trip oil  Primary oil  Lube oil  Jacking oil  Trip oil REMOTE TRIP SOLENOIDS TURBINE TRIP GEAR PROTECTIVE DEVICES IN GOVERNING SYSTEM TURBINE PROTECTON Two type of protection a)Electrical protection b)Mechanical tripping Electrical protection(through RTS)          Turbine UCB manual trip Stator water conductivity >21 mho/sec Stator water flow 0.6mm)either in left side or right side, one sets of cam comes in contact with the pawl and thereby thrust bearing trip device’s latch will be released This will cause the opening of the drain port through which auxiliary trip will be drained THANK YOU ... CONCEPT OF GOVERNING SYSTEM  FEATURES OF KWU GOVERNING SYSTEM  GOVERNING SYSTEM DEVICES  WORKING OF GOVERNING SYSTEM  HYDRAULIC AND ELECTROHYDRAULIC SYSTEM  PROTECTIVE DEVICES IN GOVERNING. .. SYSTEM  QUERIES WHAT IS GOVERNING SYSTEM ?  Turbine Governing system is meant for regulation of turbine speed under no load and varying load condition  To regulate the steam control valve position... responding to the network frequency changes SALENT FEATURES OF 200 MW KWU TURBINE GOVERNING SYSTEM      KWU 200 MW turbine is a throttle governed machine Two governors, electro-hydraulic and