Search results for query: *

Dear sirs Can somebody please tell me good book on electrical distribution system design for distribution substations, distribution lines, and also rural electrification system design? Regards,

Dear sirs Can somebody please advise on testing procedure for fire fighting pumps testing? There are main pump, a standby diesel engine pump, and two jockey pumps. These are intended for substations. Faithfully

Dear Sirs I am in need of a model of water turbine and electrical generator for my science project. Can somebody furnish idea? Can we use play-do for water- turbine, and is it possible to attach a small generator to it? Or we can use a microcontroller using input pins for sensing flow of...

Dear sirs, I was doing relay works in local control and relay panel room when the relay engineers told me that carrier current protection is used for distance protection for 220 kV. Bus there is no line trap, and we are using optical fiber (not plcc). Is this feasible? Regards,

I think it has to be washed first by sandpaper and then suitable protection layer has to be done. Sincerely,

Dear sirs: Under construction substation, we are having relay testing using RED670 and REL670, and I am curious to know 1. How impedance diagram is drawn? Our is a two channel system. How is resistance and time of operation of relay realized? 2. From local control panel, we have to operate...

Dear sirs, Can you suggest regarding earthing schemes for the following lightning arrester? Sincerely

Dear sirs, I am trying to understand and configure busbar protection relays REB 670, differential protection RED 670, distance and directional REL 670. I am trying to use PCM 600.2.11 software. This is for a gas insulated substation local control and relay panel room where bus bar panels...

Dear sirs, What could be the reason for the need is surge arrester in a gas insulated substation? Is it necessary on the transformer bay? Regards

Dear sir, Is the bay control unit same as local control cabinet? Normally I find a LCC has all switching operations for a bay such as breaker, isolator operations. Regards

While going through dynamic contact resistance measurement of gas insulated substation circuit breaker, and trying to go through IEC62271-100 and subsequently to others (IEC 62271-1: talks about resistance but not about DCRM), i could not find DRMC test methods and range of values acceptable. It...

Dear sirs, Tan delta test on 132 kV bushing for our tests are: factory value 0.311,% and site value 0.703%. but site value is greater than 0.5,%. How to deal with this? Shall we reject this bushing? This is an autotransformer Regards,

Dear sirs, Factory value and site value for capacitance measurement for bushing test is 448.2 pF and 323.853 pF: and percentage diff is 27.74%. As per my knowledge the acceptable range is from -5% to 10%. Is this bushing faulty? But tan delta values are 0.35% and 0.362%.Diff is 0.01 and...

If not acceptable, is it good to ask for replacement if within warranty period?

Dear sirs, Per tests performed on single phase autotransformers for 53.3 MVA, 132/220 kV :factory values and site test value for 220 kV bushings is 0.353% and 0.188%. 1.Is it possible to have lower than factory values at site? These tests were done after three years on newly brought unused...

Dear sirs, I came across a literature of 220 kV DC overhead transmission line design with: 1. loading calculations for max deviation security condition (BWC) everyday temp 100% wind, NC:1 ; BWC: 1 (safety factor) 2. loading calculation for min deviation security condition (BWC) everyday...

Dear sir, Can somebody please tell me what is process to calculate bid capacity? I read in my work place document as 7*A-B whereas, in google search it is given as 4*A-B where A = Average Annual Turnover of best three years out of last five fiscal years. B = Annual Value of the existing...

the motor is for residential purposes only, is single phase, and no vfd. Can a bimetallic strip be used to protect the winding from getting damaged due to heat (caused by jammed rotary ie not rotating when started). regards,

Dear sirs, What type of furbishment shall be necessary for a 2*5*3 metre room for youtube stdio? Is lighting panel necessary apart from flood lights? Regards,

Dear sirs, Is it possible to protect winding of motor by using limiting switch? I frequently have a problem of motor winding failure. The motor is used for pumping water from underground tank to almost 15 metres above. From there, water is distributed to each floor. Regards,