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  • Users: SA07
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  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 It is obsolete and OEM cannot supply an equivalent.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 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...
  3. 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
  4. 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...
  5. 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...
  6. 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?
  7. 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...
  8. 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
  9. SA07

    Turbo alternator tripped by reverse power

    Hi We have 2 turbo alternator exporting to utility grid. One turbo alternator tripped by reverse power and generator breaker opened. From fault recorder, we do not see a big fault or disturbance on the network. Feedback from Utility: they were switching flow of power to another substation. Any...
  10. SA07

    Lightning protection of power plant

    Hi We are a power plant. Since construction, lightning rod were installed on the boiler, substation 66 kV, lightning arresters on 66 kV lines and earth cables over 66 kV transmission lines. Over time 2 additional small power plants were constructed. They are not sufficiently protected against...
  11. SA07

    Ultrasound testing of MV/HV equipment

    Hi Does someone has a table showing the acceptable levels of ultrasound when doing this test? Are there any standards for these test e.g. IEC? Thanks
  12. SA07

    Can we operate Emerson Scada system/Server with Siemens PLC 400 ?

    Hi We have a Siemens Scada system, 2 servers, 1 process historian. We intend to renew this part as we are having some issues with 1 server. It was renewed in 2015 and previous system installed in 2007. We have 2 power plants exporting to national grid. We belong to an international group which...
  13. SA07

    Can we replace an AVR Basler 250 with Basler 200?

    Hi There are Basler 250 on 3 hydro plants. We have 1 spare Basler 200 in our store for another turbo-alternator. Can the hydro plant replace their Basler 250 with Basler 200 in case of breakdown?
  14. SA07

    Use of sacrificial metal to protect 55 MVA transformer

    Hi We have corrosion on our 2 x 55 MVA outdoor transformers. We are located a few km from the sea. We can only maintain the transfo. during 1-2 week during annual shutdown. Has someone used sacrificial metal to protect power transformers?
  15. SA07

    Can we start an ID fan motor 700 kW 690 Vac direct on line?

    Hi Our VSD is faulty. Our spare soft starter is being used on a second plant. We do not have another spare VSD or soft starter The motor is supplied from the following double winding transformer transformer 3.63 MVA 11kV/400V 630 kVA 690V/3MVA Dynyn11 50 Hz Primary 1 11500 2. 11275 3. 11000...
  16. SA07

    Other equipment than ADRE to monitor vibration of turbo-alternator

    Hi Is there other make of equipment to monitor vibration of turbo-alternator? We have MARK VIe on our 2 turbo alternators and there is already an electronic card in the panel to connect the ADRE. If a person is already familiar with Adre will he be able to interpret the measurements done by the...
  17. SA07

    Supplying 2 applications at 2 different pressures from one borehole pump

    Hi We will install a borehole pump 350 m3/h 220 kW supplying water to irrigation ( equipment rated 7 bar) and during drought season or other special cases to a factory ( 13 bar is required because distance is around 2 km and height difference). The pump will be used mainly for irrigation...
  18. SA07

    Fire sensor to be used in a bagasse conveyors tower

    Hi We have 2 turbo-alternator- boiler fed by coal and bagasse. For the 2nd time we had a fire in the bagasse tower and this time the damaged caused is more important. The rubber belts on 3 different conveyor belts are located at different level. On the conveyor belts there are sprinklers. The...
  19. SA07

    Power plant tripped by lightning

    Hi Due to a lightning strike near our power plant, our 2 turbines tripped. We had several miniature breakers which tripped in a UPS supplying equipment in our 66 kV station which is in open air. In a panel for controlling breakers in the 66 kV station, 2 miniature breakers also tripped. In an...
  20. SA07

    Fluctuation of MW on 2 turbo-alternators

    Hi We noticed from time to time rapid fluctuations of MW on both our turbo-alternators (45 MW each) which are exporting power on the utility grid. Any idea what may be the cause? Please see attached printscreen on scada. Thanks...

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