Answer / tendulkar

adding information to this question....
transformer is used for three purposes
1.to step and atep down the volatge.
2.for impedance matching
3.for isolation.
transformer used for isolating purpose is called isolation
transformer,it is used when there is a requirement to break
a continues big circuit,it should be noted that the voltage
at primary and secondary ends of this transformer is same

Answer / bhadrappa

for impedance matching and isolation.

it is used when there is a requirement to isolate the power ckt with control circuit and to transfer the pulse.
example: thyristor working in 415 volts firing circuit under 5volts.

Answer / nagesh.patwari

Isolation transformers block transmission of the DC component in signals from one circuit to the other, but allow AC components in signals to pass. Transformers that have a ratio of 1 to 1 between the primary and secondary windings are often used to protect secondary circuits and individuals from electrical shocks between energized conductors and earth ground. Suitably designed isolation transformers block interference caused by ground loops.

How Can we calculate the rating of a cable?Show the formula?

2 Answers   Jindal,

---

IN THE CASE OF AN ELCB, IF THERE IS ANY UNSTABILITY BETWEEN PHASE AND NEUTRAL IT MAY TRIP. BUT MY QUESTION IS WHEN A LOAD IS CONNECTED IN BETWEEN P AND N, THE LOAD CONSUMES SOME POWER AND THERE IS A DIFFERENCE IN NEUTRAL WITH RESPECT TO THE PHASE. THUS ACCORDING TO ME, THE ELCB WILL AUTOMATICALLY OPERATES WHEN EVER THE LOAD CONSUMES-- I KNOW IT IS WRONG. BUT THE SOLUTION IS?????????

1 Answers   KSEB,

---

What is the size of a 60 watt and 80 watt tubelight?

0 Answers  

---

What happen to generator if i have unbalanced load?

0 Answers   Reliance Energy, Sail, TCS,

---

On what basis do you decide the ONAN (Oil Natural air natural) or Dry type transformer for a project?

0 Answers   Semac,

---

WHY POLARITY TEST OF CT IS VERY IMPORTANT IN SWITCHGEAR

3 Answers   Birla, Reliance,

---

Explain what are inter-poles and why they are required in a dc machine.

0 Answers  

---

Dear all, i completed M.E(Power Electronics & Drives) 2011 passed out having 78% so i need job in core side but i don't know how can i receive the calls from electrical companies and i uploaded my CV in naukri, times jobs etc.. In that iam not recieved any mails from good companies so give me best procedure plzzzzzzzzzzzzzzzzzzzzzzzz..... Thanks, K.Linga Reddy Email-id:-lingareddykmthm@gmail.com Ph no:-08015402078

1 Answers  

---

Whatis the procedure for getting Electrical (light) licence while Iam a diploma holder in electrical Engg . I Compleated my one yr Apprentice training & worked as a junior engineer (ele) for 2 yr(contract basis).

1 Answers   TVS,

---

what is the formula for 3 phase motor starting cureent deatials 3phase 148A delta 415v, efficiancy 94% can we run the motor with 200A incoming supply

2 Answers  

---

what is the advantage of connecting capacitors in delta than in star?

0 Answers  

---

at what base you will tell the direction of rotation of dc motors and generators?

0 Answers  

---