Answer / mprajaneb

For design purposes we can calculate the required knee
point voltage of a CT as follows.
Vknee= (50/In) + (If/(800/5))*(Rct+0.081)
In = CT secondary current (5A)
If is the fault current expected to flow through the CT
Rct - Resistance of the CT secondary.

Answer / gunasekaran

1.2*VA*ALF/rated secondary current
suppose the ct is 5P20 class and 20VA burden we can
calculate the knee point as follows
1.2*20*20/5=96V

What is the difference between KV,KVAR,KVA,KW?

6 Answers   L&T, PowerHouse, YUI,

---

CFL lamp is what type of load?

6 Answers  

---

An alternator is started without excitation then how much voltage it will produced at strating at full rpm??

4 Answers  

---

what happens in the primary side of the transformer if transformer is short circuited first and increasing the resistance of the short circuit gradually?

3 Answers   Emerson, IIT,

---

hai...... tis is Hemanth. jst now completed electrical engineering... i wanna to apper for ap tranco exam... plzz send me the previous q's paper link......thanx in advance.

0 Answers  

---

A LT ckt i mean 440 volt flow of current100A.at this time HT current what will ON 11 KV &33 KV.plz givemy answer with example

2 Answers   Neptune,

---

How Kneepoint voltage of CT practically related when CT in service. ie Knp is above 670 what exactly means

0 Answers   ABC,

---

how does a submersible pump work..?

0 Answers  

---

Explain how you can give the overload setting to any Motor Protection Relay for a HT motors with formula and example?

0 Answers  

---

when the PFR (POWER FACTOR REGULATOR)change a step to zero,one of the RCCB will triped off,is it the changing step of this PFR effect the RCCB?

2 Answers  

---

dielectric strength of vacuum is greater than SF6 but for 132Kv uses sf6 breaker & for 33kV uses vaccum breaker why such a contradiction?

2 Answers   MSETCL Maharashtra State Electricity Transmission Co Ltd,

---

Where is the center of magnetic field in alternator

1 Answers   GMR, Siemens,

---