Answer / amit rajak

contactor- it is simply a switch or combination of switch
which is used to open or closed the circuit having
different phase wire in single phase circuit or three phase
circuit by automatic that is by pneumatic ( by air ) or
also manually.


relay -it is a protecting device that is used to protect
the circuit from faults.
it is basically a sensor which senses the fault in
electrical circuit having different parameters .it ihas a
predetermined set parameter which makes comparision under
fault condition and provides the initial signal to the
circuit breaker which fif finds the parameter more than
the predetermined magnitude or value it trips the circuit
examples of relays are:
1).electromagnetic relays
2).thermal relays
3).induction relays
4).differential relays
5).distace relays

few modification are used in these relays to suite certain
operation.

Answer / guest

relay is act as a electromagnetic switch conductor is copper
strip

what is megar testing

4 Answers   NASA,

---

Bimetal strip used in overload relay what is that,which types of material used for that & percentage.

0 Answers  

---

How to find the maximum load that can supply by a particular(say 315kva) KVA rated transformer?

2 Answers   ME,

---

what is the diffrence between kav and kvar?

5 Answers  

---

explain me how a power factor is improved by adding a capacitor?what capacitor do to improve it?in simple words and in detail?thx

7 Answers  

---

---

y r manufacturing fan is running into clockwise direction?y they can made in anticlock direction?pls give rply/ venkat.gattupalli@gmail.com pls send to my mail....

1 Answers  

---

WHAT IS THE NECESSITY OF GIVING PARTICULAR COLOURS FOR 3 PHASE TRANSFORMERS.....

5 Answers  

---

what is the difference between earth and neutral?

56 Answers   Bhel, Emerson, HCL, JLL, L&T, Siemens, TVS,

---

why the excitation is necessary to produce the reactive power

2 Answers  

---

what is hourly consumption of coal in therma plant

2 Answers   NPCIL,

---

Why we are not placing c.B 's btwn generator and transformer.? what happens when generator gets disconnected from transformer when it is running @ full load?

3 Answers   Areva,

---

can someone explain that how the speed of the protection system affects the fault level calculation?

0 Answers  

---