Answer / maprayil

Always go for the CT primary suitable for about 40% higher
currents of the load current. So if the load current is
70A, you should opt for a CT primary of 98A, say 100A.
Secondary current rating of the CT will be dependent on the
input requirements of the measuring instrument (meter)/
Controller. Many such meters specially calls for an input
of 5A or 1A. Certain meters have the option to select 5A
or 1A input based on the secondary current of the CT.

Answer / sreekar

i think u have to use 100/5A by considering initial load
currents.

Answer / g.bhaskarrao

CT range is 70/5A because it caluculates min to max current

why 3phase is 440v but where as we get phase voltage 220v,we have to get 220*3=660v.can u pleas give in detailed

3 Answers   Avantha Group,

---

write down the formula of cable size in RM if current is 50Amp.

0 Answers  

---

what would happen nif we increase or decrease the capacitor of a flood light.

1 Answers  

---

In a Capacitor the electric charge is stored in:

2 Answers   TELK Transformers And Electricals Kerala Limited,

---

"TRANSFORMER MODELING AND ANALYSIS" MEANS WHAT AND WHICH TOPICS U READ IN THIS

0 Answers  

---

in our 6.6kv motor feeder[it is having two sources from Bus A&B] earth fault relay is acting, we checked CBCT connection and cable meggerd values found very good still earth fault acting during first two are three start after that it will hold. please clarify what was the reason. if same motor is starting from other Bus-A it will start.

1 Answers   Gasal, Voltech,

---

We are using Powerica make 100 KVA DG set. Whenever i connect compressor on DG load (Compressor Make Atlas Copco 5.5 kva) that time we face the lot of fluctuation on Dg output. Can you please suggest me how can prevent this fluctuation?

6 Answers  

---

how to calculation increase capacitor,increase power factor for three phase.

0 Answers  

---

why there is a fault occurs, if a phase wire touches ground.. and the fault not occurs when we connect a bulb between phase and ground..??

1 Answers  

---

How neutral voltage for transformer decided? eg 33kv neutral voltage for 200MVA transformer?

1 Answers   MEIL,

---

What is the minimum percentage of power that a powerplant can support in ilanding mode ?

1 Answers  

---

why are the a.c.series motors preferred for electric traction

4 Answers  

---