An Energy & Environment Conscious Sustainable Organization A Presentation on “Turbine Interlocks 2X50 MW”

An Energy & Environment Conscious Sustainable Organization  Introduction  Monitoring Parameter  Interlock in CPP

An Energy & Environment Conscious Sustainable Organization Introduction  Interlocks are necessary for safe operation of any equipment.  Types:- 1.Starting Interlock 2.Running/Stop Interlock

An Energy & Environment Conscious Sustainable Organization Monitoring Parameter s a) Radial shaft Vibration - Micron b) Axial Displacement - mm c) Casing Expansion -mm c) Differential Expansion -mm d) Turbine speed -RPM e) Bearing Temp – Deg C

An Energy & Environment Conscious Sustainable Organization Vibration  It is the motion of a machine or machine part back and forth from its rest position  Can be due to various reasons like imbalance, misalignment, bent shafts, looseness, bad bearings etc.

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An Energy & Environment Conscious Sustainable Organization Axial Displacement Axial Displacement of a steam turbine is the shifting of turbine rotor in the forward and backward direction due to steam thrust on blades of rotor.

An Energy & Environment Conscious Sustainable Organization Continue… Axial Diplacement may be: 1.Positive or 2.Negative

An Energy & Environment Conscious Sustainable Organization Rotor Expansion Rotor Expansion on a turbine is the absolute measurement of the rotor's axial thermal growth with respect to the turbine's foundation.

An Energy & Environment Conscious Sustainable Organization Casing Expansion  It is the absolute expansion of turbine casing with respect to turbine foundation.

An Energy & Environment Conscious Sustainable Organization Differential Expansion Differential Expansion on a turbine is the relative measurement of the rotor's axial thermal growth with respect to the case.

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An Energy & Environment Conscious Sustainable Organization Tripping Value Main Steam Temperature Lo-Lo 410 C Thrust Pad Temperature HI-Hi ( 1 to 4) 110 C Thrust Pad Temperature HI-Hi ( 5 to 8) 110 C Turbine Front & Rear Bearing Liner Temp. Hi- Hi 100 C Generator Front & Rear Bearing Liner Temp. Hi- Hi 100 C Turbine Front & Rear Bearing Return Oil Temp. Hi- Hi 70 C Generator Front /Rear Bearing Return Oil Temp. Hi- Hi 70 C Turbine Thrust Bearing Return Oil Temp. Hi- Hi 70 C Exhaust pressure Hi- Hi (2/3 ) Kg/Cm2 Lube Oil Pressure Lo-Lo (2/3 ) 0.2 Kg/Cm2 Protection Oil Pressure Lo-Lo 8 Kg/Cm2 Cont.

An Energy & Environment Conscious Sustainable Organization Turbine Rotor Axial Displacement (A&B) Hi-Hi (+/- 1.5mm) Turbine Differential Expansion ( A&B ) Hi-Hi +3, -2 Turbine Front Shaft Vibration ( A&B) Hi-Hi 260 micrometer Turbine Rear Shaft Vibration ( A&B) Hi-Hi 260 micrometer Generator Front Shaft Vibration ( A&B) Hi-Hi 260 micrometer Generator Rear Shaft Vibration ( A&B) Hi-Hi 260 micrometer Over Speed Trip From Woodward 3270 RPM Over Speed Trip Mechanical 3300 RPM

An Energy & Environment Conscious Sustainable Organization SOP Start Permissive Remote Selected LPBS not Actuated SOP Stop Permissive Auto Selected +TG Speed is > 2950 RPM LPBS Activated Over Load Trip SOP Auto Start SOP Auto Mode + MOP Discharge < 17 Kg/Cm2

An Energy & Environment Conscious Sustainable Organization LOP Auto Start LOP Auto Mode + Lube Oil Header Pressure Lo-Lo 0.4 Kg/Cm2 EOP Auto Start EOP Auto Mode + Lube Oil Header Pressure Lo-Lo 0.3 Kg/Cm2

An Energy & Environment Conscious Sustainable Organization Turning Gear Start Permissive Jacking Oil Header Pressure > 120 Kg/Cm2 Lube Oil Header Pressure > 0.5 Kg/Cm2 Turbine Speed 15 RPM Jacking Oil Header Pressure < 120 Kg/Cm2 Lube Oil Header Pressure < 0.5 Kg/Cm2

An Energy & Environment Conscious Sustainable Organization JOP Auto Start JOP -A Auto +JOP- B Manual Turbine Speed 0.15 Kg/Cm2 JOP Auto Stop Turbine Speed > 200 RPM Lube Oil Pressure < 0.15 Kg/Cm2

An Energy & Environment Conscious Sustainable Organization THANK YOU