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in wind mill use 2100 kw asychronous generator ( induction generator ) rotor voltage : 3300,stator voltage : 690, rpm : 1511 type : MRL063E04 ' we check rotor resistance magger value found following. R-EARTH - 00 M.OHM,Y-EARTH-34 M.OHM,B-EARTH- 33M.OHM R-Y: 31 M.OHM, Y-B: 00 M.OHM,B-R :33 M.OHM HOW CAN I TAKE DECISION?pls ans. quickly
2306A 12.5 hp slip ring motor taking high initial current and its MPCB is getting open.what may be the reason?
3 5388What should the transformer connection of a 11/220 kV step up and 66/11 kV step down transformer ?
CGL,
4 8222what is mean by NPS (Negative phase sequence)fault? what is the difference between EFR & OCR faults?
2370What is the criteria in selecting Air circuit breaker(ACB) & Moulded case circuit breaker(MCCB) for a particular range?
DLF,
3 8368Post New Electrical Engineering Questions
Hi Suppose we have a wye/wye transformer which is grounded at both sides,in this situation, do we have ay ground transformer? in other words, ground transformer can do any thing more (while we have nuetral wire in both sides)? As the last question, what about 3rd harmonic? we have two choices: first using wye/delta transformer + ground transformer and second using wye/wye earthed connection.in the former choice, we dont have 3rd harmoonic at the secondary side but what about Yn/yn conection? do we suffer from 3rd harmonic in the Yn/yn connection?
What are differences between Voltage, EMF & Potential difference ?
In a 3 phase 4-wire system. For a 3.5 core cable if all loads are single phase and balanced, what will be neutral current? will it be sum of all phase currents? Or it will be zero? And if loads are unbalanced what will be neutral current?
-What should be minimum value of insulation resistance and maximum value of earth resistance at any electrical instillation and what is method of testing the same.
What are the commonly used schemes for the bus zone protection?
Define what is the function of anti-pumping in circuit breaker?
why we use circuit breakers for switching instead of normal switching device?
1)How much current can a 3-1/2 core 100 mm wire carry? 2)What are the special cables required for explosion proof wiring? 3)In case you do not have coal and salt for earthing, how can you achieve good temporary earthing? 4)One horse power single phase motor is more likely to get hot than a one horse power 3 phase motor. Is it true or false, if true why? 5)What are the different types of soft starters for large motors?please explain?
how choose conductor&depending upon load
why starting current is high and resistance is almost 0 during the starting of motor dc motor...?
What is touch potential and step potential?
Draw a circuit diagram in which if button is open we can use socket and bulb as a series test circit and if button is close than simple we can use socket as any load purpose.
what happens to the supply voltage if there is any change in frequency?
Tell me the reason of connecting domestic t/f primary in star or delta,and also secondary side.
please write motor, transformer, Generator setting, fault level calculation of Tr.etc
