Answer / javad ahamad

both e/f relays are different. consider an alternator, its
neutral is earthed through a
resistance inorder to limit earth fault current .then we
cant protect the 100% winding from
differential e/f relay only.because if an e/f occurs at
very near to neutral point the driving
current to operate relay will be very small. there for it
cant be sensed by this method,
we can protect up to 80%(approximate value.depent upon
resistance)only.at this situation
we r providing a restrcted e/f relay to protect the
remaining winding ie 20%.this relay
have very low current setting.by the combination of these
two we can protect 100% winding.

what is meant by re-rolling motor? how it differs from standard motor?

0 Answers  

---

What is the rotor frequency of 10 Hp 1440 RPM 50HZ 415V ?

0 Answers  

---

my bachelors was done with EEE now i got admit in NU with CS as course. how to answer this qns 1) why u choose cs? 2) why u changed from eee to cs

0 Answers  

---

why bulbs when connected in series glow dim

4 Answers  

---

what is meant by motor startup supervision & motor load jam protection ?

0 Answers   ABB,

---

---

in electric lamp what is ballast. y its needed to start & stop lamp. what is ballast ckt.

0 Answers  

---

What is the type of earth fault protection used in battery? explain.

0 Answers   PSEB,

---

hello if any one have papers vof hpcl or sail, plz send me

0 Answers  

---

how to calculate current carring capacity of cable and cable selection? 1) copper flexible cable 2) copper armoured cable 3) Aluminium cable

0 Answers  

---

Is there any type of starter for DC motor other than two point,Three point and Four point starters?

0 Answers  

---

WHAT IS THE FUNCTION OF SHORT CIRCUIT MAINTENANCE CT

0 Answers   KSEB,

---

A circuit breaker on detecting fault will a. Open b. Close c. Open and trigger the alarm

2 Answers  

---