Answer / phanendra babu

if it is 3ph supply there will be a displacement of 120
degrees b/w each phase so the flux produced is also having
the same displacement,if we add these three phasors the
resultant flux will rotate anti clock wise from instant to
instant.

Answer / ishaan

With the application of balanced 3-phase currents in the
stator windings of induction motor, flux produces due to all
the 3 currents which are 120 degrees apart to each other,
resultant of which is the net magnetic flux rotating in the
air gap. It is said to be alternating due to continues
occurence of N and S poles in succession.

Answer / rahul

When a net rotational torque is produced, the field is said
to be rotating (Eg> for a 3ph supply given to an
alternator.)

WHen no net rotational torque is produced due to the fact
that Fwd and Bwd torques are Equeal and Opp.,(Eg: in case
of a single phase(not split phase) supply given to a single
phase motor), then magn field is pulsating.

Answer / rajendran

when a three phase supply is applied to a machine then a
rotating magnetic field is established..... it means the
resulatant force due to the magnetic fields creates an
effect equal to that of an magnetic pole pair is rotated at
synchronous speed.

so we call it as RMF.

URGENT PLEASE//////////A WORK SHOP IS HAVING A 100 KVA TRANSFORMER 11KV/415 VOLTS, AND THE CONNECTED LOAD OF THE WORK SHOP IS 80 KW WITH INDUCTIVE LOADS, LIGHTING LOADS,ETC., HOW MANY EARTH ELECTRODES ARE NEEDED AND WHAT IS THE EARTH RESISTANCE OF EACH EARTH ELECTRODE AND COMBINED EARTH RESISTANCE in normal soil. AT 11 KV SIDE AND AT LT SIDE. HOW TO CALCULATE.

1 Answers  

---

What is the difference between online ups and offline ups?

44 Answers   Electrical Tech, GMR, Gravity India, HCL, Indus Towers, NIT, Pyramid, Techno Electric and Engineering, UBS,

---

What is the difference b/w earthing & grounding?

6 Answers  

---

what is the function of DC panel in substation?

4 Answers  

---

What is the use of bundle conductors?

0 Answers  

---

what is the HT motor current setting (Motor protection relay)aganist FLA If the capacitor is connected in parallal to the motor to increase the P.F from 0.89 to 0.99. the setting is to be reduced. what is the formula for to calculate the current.(FLA - CALCULATED CURRENT!= )

1 Answers  

---

What does bode plots shows?

0 Answers  

---

How to design grid earthing

1 Answers  

---

whu the transformer noise during running condition?

1 Answers   NTPC,

---

Brief me about maintenance planning & sheduling of machine tool.

0 Answers   HCL, Thermax,

---

how to caculate cable size for given amperes

5 Answers   RVNL,

---

why stone used in Transformer yard.

9 Answers   Birla, Eskom,

---