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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...

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

It is a steam turbine.

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

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...

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

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...

Thank you FacEngrPE for detailed explanation and links

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...

Thank You FacEngrPE

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

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...

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?

Thank you PRC

Thank you for your feedback. Our local paint company has recommended zinc rich primer

3 blocks have been replaced on our VSD 1. Unit 1 is operating with VSD on ID fan Unit 2 is operating with Soft starter on ID fan For info Both units are exporting same MW we have 844 kW on aux transfo unit 1 1306 kW on aux transfo unit 2 VSD ID fan 2 operating at 36.3 Hz consuming 221 kW ID...

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?

In 1 week we must start the plant after annual maintenance. Else we will get penalty from utility company. We export on the grid. If we get a soft starter we can start the plant to avoid penalty. In the long run, we will order a vsd to save energy. Even a second hand soft starter will be helpful.

Sorry for the mistake. I meant supply directly to 690 Vac 50 Hz and operating at nominal fixed speed and the damper is regulating the flue gas flow.

One boiler is actually operating with the ID fan supplied through a soft starter. After start up, the motor is supplied through the bypass; so DOL. There is a damper to control the flue gas flow. The boiler is operating well now although with a VSD the kW consumed would be much less. Our normal...