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What are the circuit models used for analysis of medium length transmission lines? Which one is superior? Support your answer.
UPSC,
1 5671What are the typical values of characteristic impedences of overhead line and underground cabel? Why there is so much variation?
1 4215Is the force acting between two parallel conductors of infinte length carrying AC of frequency 50Hz remians constant with respect of time? If not then what would be the frequency of the force acting?
1 3766Can the field winding in synchronous machines be placed on stator?What is the limitation of such arrangement?
2 5024An alternator is started without excitation then how much voltage it will produced at strating at full rpm??
4 6994Why the design of electromechanical energy conversion machines is based on the medium of conversion as megnetic field not as electric field?
2 5536What is the approximate percentage of Si content in transformer core(CRGO-Cold Rolled Grain Oriented)? Why it is kept so low?
1 3677what is the use of vector group in transformer. means what r the application of various vector groups?
5 13062Post New Electrical Engineering Questions
how to test the turn ratio of 3 phase transformer using volt meter shoe the curcit diagram.
What is distance between electrical panel to land ?
Refernce currents are to be generated using refernce cueernts how can this be done
How to measure the earth resistance value in a concrete pavement(flood light area)?
How relay coordination has to be done? what are the inputs are required for this? Please explain this with calculation method?
what purose of the double circuit transmission line phase of the line phase changed for circuit-1 for Circuit-2 R-Y-B B-Y-R
if the motor rated speed is 950rpm. how to change the above rated speed? is it possible?
Dear all, I just want to ask an expert on this forum for some insights. For the magnetic balance test, when applied voltage on a Delta-Star transformer e.g. Dyn11, the following relationships apply for HV side: 1. H1-H2 = H2-H3 H3-H1 2. H2-H3 = H3-H1 H1-H2 3. H3-H1 = H1-H2 H2-H3 For the LV side also: 4. X1-X0 = X2-X0 X3-X0 5. X2-X0 = X3-X0 X1-X0 6. X3-X0 = X1-X0 X2-X0 Is there a similar pattern for Y-d, Y-Y, D-d? And how about Y-z, D-z, Z-y transformers? I've tested a YNzn5 transformer and for LV side I don't see the pattern. In this particular case I got for LV side the following (see values below): H1-H0 H2-H0 H3-H0 X0-X1 X0-X2 X0-X3 128.0 119.9 7.2 29.2 13.3 15.8 70.7 128.4 59.2 23.4 22.0 3.6 7.2 120.1 128.1 13.4 29.3 15.8 What is the relationship here for LV? For row 1 I see the relationship, for row 3 I also see but it's shifted, but for row 2 I don't see such relationship. Any suggestions, answers, someone?
how is positive, negative, zero sequence is happen.. how is effect on 3 phase system
what is die electric strnth of transformer ?
Hello everyone, somebody knows what is a "surplice power" ? The hole phrase is: "This rating is appropriate for a generator set paralleled with an infinite bus e.g. a national electrical supply network or grid where the generator set is run at 100% load, 24 hours a day, 365 days a year and any surplice power is exported into the grid" Thanks in advance.
i have faced a problem in ro plant grunfos make bm30type pump it is 22kw pump. We start this pump using siemens 3rw 4423-ibc44, 30kw softstarter but this soft starter will frequently failier so we planed to change dol starter. So pls tell anybudy its possible or not.
What is core CT & it's function?
how to calculate differential current when we testing differential relay..suppose we have 1000kw generator,630amp VCB,what value we should put /inject so that relay trip the VCB? PLLZ justify ur comment
why most of junction box vendors providing T5/T6 Temp class jb's for T3 area any special reason?
