I need a 33/690V Dry type transformer.How to select IP class for this transformer.This will be an outdoor transformer located in a highly polluted environment.
3 3391How Id and Ires are calculated in siprotech 7ut612 and abb trsfmr differential relay.what is the formula
1 2183what happen if any one phase of a slipring induction rotor winding is open?is it start or won't?
2 4387some ac motor's direction get change dueto ghanging input to the ac drives.(say ryb to rby). but some motor direction remains the same when phase sequence is changed fromdive side. can anybody guide me?
1 3247There is one 40MVA oil cooled transformer (yet to commission), filled with 95% oil and we are trying to fill 5% Nytrogen in that transformer so that there should not be any foreign component inside. But even though there is no leakage, nytrogen is not withstanding inside transformer, within a day or two pressure guage is showing 0. Why is it soooo? Pls reply.
1 2314In our domestic single phase line if you don't have a ground connection (earthing)how will you separately use earth in a specific power supply board.
1 2275Post New Electrical Engineering Questions
What are the advantages and disadvantages of negative feed back?
what is spadar bar .why I use in DC generator.
How to Calculate the Fault Level of Electrical Installation
Do closed loops systems require manual input?
How Can I calculate for the photometrics requirements for a street lighting? Data given are: 45 units of 6 meter light pole with 150 watts metal halide lamp, 220 volts and installed in a promenade area.
why capacitive load is not used in routine life????any reason is there ??????
can anybody tell me that for p.f. Improvment we use capacitor banks but how to decide its capacitance. As we all know how to calculate kvar but what abt capacitance value
For electrical designers what are the standard should know? i want learn about this standards. how to get information/reference. anybody help in this regards please.
what is subtransient , transient and steady stateac components
How line capacitance & line inductance varies with increase in height tower.
what is allowable ac mixing in dc
what is the safe meggar values for motor, transformer HT, LT and Cables? IF we want to replace I/C bay at our 220 kv substation which is of 140 mw load capacity bay to be replaced by 400 mw capacity bay.other than CT(1200/1) what are the other equipment i have to replace. why we generally use 3.5 core cable or in other word 1/2 core for neutral and also confirm me that in balance conditiob(3 phase)current in neutral will zero
In a voltage-controlled current source A A current booster is never used B The load is always floated C A stiff current source drives the load D The load current equals Isc
How many types of losses occur in a transformer?
what percent do you derate your copper wire when you change from copper buss to copper wire
