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ENGINE SPEED GOVERNOR PowerPoint Presentation
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ENGINE SPEED GOVERNOR

ENGINE SPEED GOVERNOR

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ENGINE SPEED GOVERNOR

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  1. DEGO III Q-TAGG ENGINE SPEED GOVERNOR Space for picture

  2. DEGO III - Main features • Very simple commissioning • Cost effective • The properties of DEGO II are retained • Sturdy electric actuator = low maintenance • Fuzzy control • Diagnostics functions integrated • Built-in instruction (user’s manual)

  3. More features • Customized from a normal PC in Windows format • Inter-active commissioning via the PC • Protocol on all settings can be printed out after commissioning • The governor set-up is easily tested against a realistic simulator program before engine start up

  4. Propulsion governor features • The control algorithm is automatically adopted to the actual running condition • Back-up control bypassing the governor in fixed propeller applications • Excellent load sharing in multi-engine applications • The parameters for most slow speed engines are stored in the programming aid

  5. Generator governor- features • Three modes of operation: • - Speed droop • - Isochronous • - Load control • Program for smooth start-up • Synchronizing integrated • Power measurement integrated

  6. The principle for loadsharingUltimate stability is achieved

  7. Typical twin engine arrangement

  8. Low Frequency Torsional Oscillations If the shaft system has a resonance that is in a frequency range that the governor can respond to, the governor can amplify the torsional oscillation A misfiring can excite the torsional oscillation In severe cases the torque is changing sign also at load (gives gear hammering) The governor gain setting for stability is extremely low Installation of one pickup on each side of the elastic coupling may be efficient If a Multi Channel Tacho (MCT) is installed, we can guarantee that the governor not is making the situation worse '

  9. Suppression of torsional oscil-lations with the MCT funtion Governorelectronics with Multi Channel Tacho functions F A SPEED U V E F R U ALTERNATOR OR GEARBOX ELASTIC COUPLING

  10. Arrangement for Diesel-Electric propulsion NOT ABB SUPPLY SUPERIOR C/R MSB PANEL CONTROL PANEL GOVERNOR CUBICLE TERMINALS QHFD 552 POWER AMPLIFIER CONTROLLER SPEED TRIMMER FUEL SET TERMINALS UNIT SUPPLY 24 VDC INTERCONNECTION ACTUATOR 48 VDC 24 VDC BATT. HARMONICS FILTER 3x400 VAC TERMINALS SUPPLY UNIT MSB TRANSFORMERS CIRCUIT VT PICKUPS BREAKER CT GENERATOR DIESEL ENGINE

  11. Features in Speed Droop mode Same characteristics as for hydraulic governors The frequency is load dependant (static) and fluctuating with load variations (no feed forward) Difficult to maintain load sharing at loss of load Loading up and loading down is manual Utilised to arrange smooth load up and load down No signals from the switchboard are required

  12. Features in Isochronous mode The frequency is always nominal (50 Hz) Equal load sharing also at low load The load sharing and the frequency is maintained also at large load changes The load sharing is based on electric power Used when the station busbar is isolated The frequency is independent from load variations

  13. Load rejection Without feed forward Withfeed forward

  14. Features in Load Control mode The governor is converted to a "power regulator" The load is independent from frequency variations The desired power level is easily preset The fuel rack is completely steady Requires minimum one unit connected to the busbar in frequency control (electric interlock needed) Utilised to arrange smooth load up and load down

  15. Loading up/down sequence FIX LEVEL AVERAGE LOAD BREAKING POINTS START LEVEL LOAD CONTROL CIRCUIT BREAKER ORDER UNLOAD BREAKER TRIP

  16. Arrangement of the control unit

  17. Disposition of the power amplifier

  18. LED indications on the processor board

  19. LED indications on the terminal board

  20. Terminal disposition

  21. Speed sensing circuits

  22. Torque limit setting window

  23. Influence of the start parameters

  24. 3-dimensional setting of the integrator

  25. Integrator limit

  26. 3-dimensional setting of the Gain

  27. Zone amplifier

  28. 3-dimensional setting of the D-part

  29. Overshoot limiter

  30. Actuator control loop

  31. Fuel servo – Block diagram

  32. Arrangement of DC-supplied servo

  33. Output for Woodward and Barber Colman actuators

  34. Different pick-up types

  35. Choose the right pick-up location Correct pick-up location Shaft bearing Engine Correct pick-up location This location gives problems Tank top

  36. ASAC 70 – Exploded view

  37. Commissioning Aid - Overview

  38. Commissioning Aid Speed Control Loop Propulsion

  39. Commissioning Aid – Typical work picture

  40. Processor board

  41. Processor board without cover

  42. Terminal board and power ampl.

  43. Terminal board without cover