Recent content by Emad Shaaban

Thank you every one, I tried to find 380/480v step up transformer ,but it seem to be unavailable on the local markets on my region. Can you please suggest other options please

What if user the standby 380v generator and then increase its excitation,will that affect winding withstanding?

Hi every one A heat treatment machine (pro heat 35) works with power supply 470v/575v..please see attachment What options I have to make this machine works on 380v power supply

Hi Thanks every body for your valuable instruction. It was very helpful. I was able successfully to get 15v with 24vdc excitation when the rotor spin for about 150rpm I kept following your instructions and I was happy with you for lending a helping hand

We’ve just completed a bearing replacement for a 4-pole, 50 Hz, 2 MVA synchronous generator. Before full commissioning, we urgently need clarification on the following points: Minimum Speed for Voltage Generation: What is the minimum rotor speed at which we can expect the generator to...

Would you please do that for me please

We are currently assessing the condition of a three-phase 2.5 kVA, 400V emergency generator, which is used for black start only. During our routine checks, we observed the following insulation resistance values: • Initial readings (before cleaning): • Phase to ground (IR): as low...

Dear experts, I’m working in Generator protection panel that equipped with several ALSTOM relay: MX3AMD20A MX3DPG3A MX3IPG1A MX3IPG2A We need to connect these relays with PC to uploads and downloads the configuration files rather than doing it manually. Iam trying to find what is the PC...

copper bar rotor

Thanks for every body, Ed, Can you make it more clear, If we loaded the motor at 110% and its speed get more slower ,does that mean the its rotor ,stater or mechnical ? same fore nosie ?

Hi everybody A 1800kw electrical motor running with normal temperature and current but with a humming noise.CBM team saying that no vibration has detected because of bearings or a mechanical issue, however the vibration specturm analysis shows frequency of 100hz beside the Ffund 50hz .We are...

Thanks for all of you I have already found an evedance of the phantom voltage that lasts less than 30ms as seen in the I24.. Now to connect a load resistor ,how can I determine the proper size f this resistor .

Hi I thank you for your response 78T is done using Sepam 2000 d22 Both LV and HV sides use T40 and the external trip coming directly from LV side Sepam (soft contact) Can you explain what u mean by DC ground ? Yes the external trip cables that come from LV side are 2km long and it’s a multi...

The Transformer feeders in our plant are running by Sepam T40s at both primary and secondary sides. During the last 8 years we encountered issues that happened quite several times ,in which the Sepam of Primary record an external trip and open its SWG.. This configured external trip input is...