Answer / thowsif_emerson

It consists of an iron armature fastened to a balance beam.
Under normal operating Conditions, the current through
the relay coil is such that the beam is held in the
horizontal position by the spring. When a fault occurs,
the current through the relay coil becomes greater
than the pick up value and the beam is attracted
to close the trip circuit. This causes the opening of
the circuit breaker to isolate the faulty circuit..

Log on to:-
http://electricalandelectronics.org/2008/10/30/electromagnet
ic-attraction-relays/

whay we transmit power in 3phase no in 4 or 2 or 5......etc?

4 Answers   CCCL,

---

The screw thread commonly used for transmission of motion is one of the following types of threads

0 Answers   Caterpillar,

---

Relation in between KWH & KVAH for Electrical consumption unit & how we can relate if KWH is lower than KVAH

11 Answers   Deepak Fertilisers, Torrent Pharma,

---

Which is stiffer between salient pole rotor and cylindrical rotor synchronous machines? Justify your answer.

1 Answers  

---

What is the clear distance between a MV panel(rear side) and wall.

3 Answers   L&T,

---

Where should the lighting arrestor be placed in distribution lines?

0 Answers  

---

what happen ehen synchronisation is done at below rated speed

0 Answers  

---

What type of protective system we uses in L.V. distribution panels?

6 Answers  

---

what is black out?,what is brown out?

1 Answers  

---

What is VCB'S @ ACB'S.Plz explain Briefly

2 Answers  

---

why exterrnal C.T. protection is used even though ACB& VCB is having inbuild C.T. protection?

2 Answers  

---

what are the oils used in transformers cooling? n which type transformer is used in power systems?

1 Answers  

---