Answer Posted / rajashekar

There is no separate formula for calculating no load
current, It depends upon it internal losses like Wearing &
Tearing, Bearing condition and IR losses etc.

Secondly, We can see that, In Breaker circuit only NO is
used for Closing, Opening and Triping Purpose, where as
with out NC circuit it wouldnt be complete. To trip the
motor we should break the NC element.
In India normally 110 Vdc for breaker and 230 Vac supply
for Starter control wiring.

in the directional overcurrent and earthfault protection,normally we are setting the angle 45 deg lead for phase fault overcurrent and -45 deg lead for earthfault fro forward direction.but both the fault are operating on the same angle region only.why?how the relay will response?

1824

---

what is the responsibility of C license holder in industry?

9148

---

what should be the no load current for 3 phase ac motors ranging from 5 kw to 1000kw?

1787

---

2- What are the percentages between excitation currents in phase (R, S and T) in ∆ and Ỵ connections in excitation Current test in transformers?

2008

---

Pls mail me utility & Dg related question with answer

1779

---

what rectifiers is and what are the types of rectifiers?

1131

---

I want to know the 'Test voltage' for Tandelta testing of 3.3 / 6.6 / 11 KV Motors. Please explain

2256

---

what does mean of RCT and STR in diffrential CT?

4224

---

what is the difference between 50 hz freq. and 60 hz freq.? which is better and economic in them ?

2278

---

How does PLC work for sychronising of Two or more DG sets?

2068

---

How to do maintenance of transformer feeder.

1849

---

how to calculate micom relay earth falt time and current sertting

2481

---

What is the function of the circuit breaker failure relay?

2371

---

why we testing the core balance of the transformer before comissioning?

2164

---

If 22 KV HT line, Current transformer is 25/5 then how to calculate multiplying factor.

1087

---