KWU Electro Hydraulic Governing Final1

KWU Electro-Hydraulic governing Governor is a device to control speed /load to a set point. Type: Hydraulic & Electro-hydraulic Advantages & disadvantages

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ADVANTAGES OF EHC • i) Increases the life of turboset by conservative operation with the aid of TSE • ii) Reliable operation of isolated power grid by Automatic Switchover of the load controller to frequency control. • iii) Precise maintenance of the rated frequency of the  power  pow er grid grid by by mean meanss of an an exact exact frequ frequenc ency y load load curve

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kwu • EHC can be divided into following sub-sections: • 1

Speed measurement and Speed controller 

• 2

Loa oad d contr trol olle lerr and Loa oad d measu sure rem ment

• 3 Pressure controller  • 4

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t l t

sf

f S ed ed,, L ad

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Droop of kwu m/c output +100%

2790 0%

2940

3060

3210 RPM

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What is Droop? % of frequency change ( % of RPM change) will lead to full travel of Governing valves or  full load change. 5% droop means: 5%*50 Hz= 2.5 Hz Will change 500MW. In terms of output total

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TURBINE DROOP 5% & NO DEAD BAND

2700

2850

3000 RPM

3150

3300

+100%

0

-150 RPM

-100% +100%

2790

0

+150 RPM

+300

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1a Speed measurement • Hall probes are mounted around a disc (fitted

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1b S peed Controller  • Speed Controller is Controller is used to increase turbine speed from barring speed to rated speed in a controlled

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Speed controller can be divided into sub section: Speed set point, Speed set point control, Dn/Dt monitoring, Speed control Loop, No load correction.

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 b) Speed Set Point control c ontrol • Speed Set Point control :- The set point

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c) Dn/Dt MONITORING • A Spee Speed d con contr trol olle lerr outp output ut (hr (hr n c) c) sho shoul uld d be be mor moree than 0.0 V (with a time delay of 10 seconds)

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LOAD SHEDDING RELAY • LOAD shedding relay is used to support the function of  the turbine governor. A quick correction value input to the hydraulic governor output & secondary oil pr. of  IPCV min speed building • When acceleration time constant is very small or when governor under load or pressure control. • Sudden negative jump in load is detected electrically instantaneously by the load shedding relay • 200MW: Load throw off>40% & residual load