Search results for query: *

I just wanted to confirm that with autotransformers, I don't need to meet the full kVA of the equipment, on the rated amps times the difference in voltage. I mean what’s the minimum suggested TR size to handle the 37kw

Thank you indeed for you engagement. I’m afraid of that VFDs does not give a smooth sinusoidal wave but a square wave that can properly run an induction load but not electric I decided to go with option suggested by Eng @ waross by implementing an open delta auto transformer

Hi all We have noted a surface partial discharge on dry resin 20kv/6.6kv 1.5MVA transformer,please see pictures The only available test for me are insulation resistance test ,high pot and ratio test by cbc100. IR 200Mohm PI 2.5 My question are: How serious their conditions are?can it be kept...

Impressive experience.I will get it started and keep my experience posted here.Thanks again

Thank you(WAROSS) very much with all respect for your time and efforts .that was very supportive .

Thanks everyone,thanks waross. Actually my application is to step up 380v /480v please excuse my limited experience, 3ph 380/110 transformer is available .it not single cores. I need to be fully aware of connection .I should be very appreciative if can be sketched for me

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...