I have a 5 years old car and I find that some of the parts like door hinges and bolts etc are starting to get rusted.... is there a product available that would clean and protect these parts?
Sarg
We have a recent generator rewind and upgrade. Runner was also refurbished. We asked the contractor/supplier to provide a name plate that would show exactly the power the generator would generate when coupled to the existing generator which is less than what the generator is actually designed...
Would appreciate if anyone could help me find a good testing facility for testing 12500/1 A, 30VA CTs in Europe. Need to get the saturation curve. Thank you.
Sarg
The short circuit current at the branch bus duct for excitation system has been calculated as 130kA. But at this location we have CTs with Idynamic as 50kA.
Need the forums response on whether the CTs will with stand the calculated short circuit current? What could be the repercussions...
A certain protection relay has CT requirements of Vk > 50In (Rct + 2Rl + Rr). Where In is unity, and (2Rl + Rr) = 3. What would be the consequences if the Vk and Rct requirements are not 100 % met by the CT supplier? i.e Vk of the CT is lower than the calculated value (by the above formula)...
How important is it to know that knee point voltage of a CT? Does it impact the design of the protection and metering systems? Is the formala; Vk > 50(Rct =3) where Rct is the resistance of the CT at 75C and Vk is the minimum knee point voltage, correct?
Any and all help shall be highly...
Is any semi conducting material available in the market, for use as fillers in generator winding, which is also designated as Class F?
Let me re phrase my question; Can a semi conducting slot filler also be class F? If yes, is it possible to get some recommendations?
Sarg
Whats the major difference between Vector group Yd-1 and Yd-5 of a power transformer? Any advantages of one over another? Does it amtter if in a power plant some units have Yd-1 while others have Yd-5?
Sarg
Can anyone help me define Class of Insulation based on temperature? I mean what's the difference between Class B and Class F insulation? Does it depend on the application?
Thank you for your help.
Sarg.
Sarg
I am looking for standards for shaft vibration of hydro electric units. Basically its a refurbishment project and we need these values to guarantee some sort of a maximum level. I shall be grateful for all the help.
Sarg
Is it necessary to carry out cote loop test along with an El-cid test for an old stator core before and after rewind? My question is: is El-cid good enough to give a good idea of the condition of the core?
Sarg
Is it acceptable to put RTDs between top and bottom bars of different circuits of the same phase in a hydro electric generator? I am looking for the pros and cons of doing so in comparison to placing the RTDs in between the top and bottom bars of the same circuit of the same phase.
This is a...
Hello all
For hydroelectric generator's stator winding:
I need the advantages and disadvantages of stator winding having adjacent poles as compared to winding arrangement with alternate poles. All help is highly appreciated. Thank you.
Sarg
Whats the best way to calculate the max current density a copper main lead for a generator can carry. The voltage is 13.8 kV and the dimensions of the copper bus are: 0.5" x 4.0" x 8.0" --- Copper?
Sarg
I would appreciate if some one could explain the theory behind the stress (in volts per mil) on coil insulation of an electric generator. What's its significance and why is it taken into account while designing an electric generator?
Any help in this regard would be highly appreciated.
Thank you.
