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Recent content by SA07

  1. SA07

    Alternative diode protection relay for power alternators

    Hi We have a Microener diode protection relay for our alternator 45 MW. It is obsolete and OEM cannot supply an equivalent. Can you please propose stand alone alternative Make and reference for such diode protection relay? Please see attached wiring drawing
  2. SA07

    How to test short in alternator rotor winding inside the slots?

    Our insurance company is suggesting we do the following test: The Recurrent Surge Oscillograph (RSO) test, also known as a surge comparison test, is a non-destructive method used to detect and locate inter-turn and ground faults in alternator rotors, especially for turbogenerators. It involves...
  3. SA07

    How to protect against frequent breakdown of soft starters at a water pumping station?

    We installed a new borehole pump + new VSD last year. Both broke down after only a few months of operation. It seems VSD does not work well with borehole pump which must be started < 3 s. We have switched to soft starter. Star -delta also creates shock in water pipe.
  4. SA07

    How to protect against frequent breakdown of soft starters at a water pumping station?

    Hi We have a pumping station with the following pumps supplied by soft starters. We noticed frequent breakdown of soft starters. The station is supplied by the utility grid 22 kV through a 22kV/400 V transformer. There are frequent faults on this 22 kV and we have no control on it. It seems...
  5. SA07

    How to test short in alternator rotor winding inside the slots?

    Hi What test can be done to test for short in an alternator rotor winding inside the slots? Alternator 45 MW 11kV 1500 rpm Thanks
  6. SA07

    Bolt in connection box of motor cut off

    Hi One bolt in a motor connection box was cut off. Please see pictures. The screw material seems brass type and the nuts seems stainless steel. Is this normal? For such application should we tighten using torque wrench? For other applications such as copper busbar, copper lugs fixation, can we...
  7. SA07

    White smoke coming from stack

    Hi We are operating a small boiler 11 t/hr steam coal fluidised bed boiler burning 6 mm coal and using bed ash. We have electrostatic field precipitator with 3 fields. All fields are working. We have a white smoke coming from the stack. Please see picture. Will adding limestone to combustion...
  8. SA07

    To replace obsolete Mark VIe steam turbine control system

    Some power plants similar as ours have upgraded their turbine control system by Emerson. Does someone has Emerson turbine control system? Any feedback?
  9. SA07

    To replace obsolete Mark VIe steam turbine control system

    Hi Spares for the Mark VIe are becoming obsolete. For a 45 MW steam turbine , what other control system we can use instead of Mark VI? The system is very complex, the spare cards are very expensive and very long delivery delay. Can we replace with Woodward or another system?
  10. SA07

    To replace faulty power alternator with a smaller unit

    Waross: We do not have this system of motoring the alternator at start up. To start up, we run on barring gear for some time and then increase the speed of the turbine through a ramp defined in the PLC by opening the control valve and supplying steam from the boiler until nominal speed and then...
  11. SA07

    To replace faulty power alternator with a smaller unit

    Hi Waross Is it not the opposite i.e. the turbine that provides the mechanical energy to drive the alternator?
  12. SA07

    To replace faulty power alternator with a smaller unit

    It is a steam turbine.
  13. SA07

    To replace faulty power alternator with a smaller unit

    The turbine and gear remain the same. They will be connected to a smaller alternator of size 46 MVA. Output of gear speed to the alternator is the same i.e. 1500 rpm
  14. SA07

    To replace faulty power alternator with a smaller unit

    Hi Due to breakdown of an alternator 60 MVA, can we replace it with another alternator 46 MVA? We intend to replace only the alternator; the gear and turbine will remain the same. Please see details below Bigger plant...
  15. SA07

    Lifetime of Fire trace tubing

    Hi We have Firetrace system installed in our electrical panels since 2017. Some piping are starting to crack. All our electrical rooms are clean, air conditioned. Have any one encounter this issue? Any idea what is the lifetime of the Firetrace tubing? Thanks
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