Answer / ganesh

CT's are used in Electrical circuits for different
purposes. For example measurement, protection. In
protection also if it is busbar or differntial protection
the sensitivity of the CT is very important. According to
the purpose it is going to serve the accuracy class of the
CT differs. For measurement it is enough to have low
accuracy class say 10P10 . If it is for Differential or
busbar protection it will be class x which is very accurate
it measurement

Answer / vimal dixit

Measuring C.T.s - 0.2% class
Protection C.T.s - 5p10 class
AS in measuring cts accuracy of measurement is required.
While in protection cts only mesurement is required.

how one can know the charging time, discharging time of a 12 VDC battery ? If i have a battery of 12 VDC , 4.0 AH , how long will it take to charge from a charger (power supply) of input 220 V , Output 15 V and output current of 3000 mA and how long will it take to discharge whether using or not ? How much backup will it give ?

1 Answers   ONGC,

---

What conditions are required for transformer to operate at low frequencies ?

0 Answers  

---

what is LSR?

0 Answers  

---

What is VCB? where it is installed at SP. What is SP?

0 Answers  

---

Define Electrical Insulation and examples of Solid,Liquid and Gaseous insulating materials?

0 Answers   MPPTCL,

---

An 8 pole, 50 Hz, 3-phase IM is loaded to a poing where pull out torque will occur. The rotor resistance per phase is 0.3 ohm and motor stalls at 650 rpm. The rotor frequency at maximum torque point is A 3.33% B 4.44% C 5.55% D 6.66%

1 Answers  

---

how LT meggar works

1 Answers   Essar,

---

I know during Surge Impedance Loading maximum power is transferred through a transmission line and also Sending end voltage becomes equal to Receiving end voltage i.e Vs=Vr so my question is if both end voltages are equal then how current travels in such line hence how power is transmitted because flow of current needs Potential difference??

3 Answers   NTPC,

---

if the synchronizing b/w generator and busbar not complete and we close the out going circuit breaker of generator then what happen ?

4 Answers  

---

how can i change the rotation of the AC single phase induction motor and show me by diagram

0 Answers  

---

how can testing using megger?

1 Answers  

---

1)Why V cross Arm is used in transmission lines? 2)Why H cross Arm are not used in single poles?

1 Answers  

---