Answer / nagendra

Whenever a fault occurs the circuit breaker trips.Reclosing of the breaker automatically when the fault on the system cleared is known as auto reclose system in circuit breakers

Answer / raul

basically there r 3 types of faults..... transient fault
(80%), semi-permanent fault (12%) and permanent faults
(8%). transient fault occurs only for a small duration, the
CB is opened for a short duration of time so dat d cause of
failure is cleared and the line is re-closed by closing the
CB. for semi-permanent faults which r basically due to a
twig falling on d line or a bird spanning around a
conductor.......the auto-reclosing after the cause is burnt
away.........and finally the permanent faults ie single
phase permanent fault n 3phase permanent fault.....for 1-
phase fault, the remaining two phases r operational n the
faulted phases is taken out for repairs n after d repair is
done the line is reclosed n for the other 3-phase fault,
the complete 3-phases r taken off for repair n after d
repair is done, all d 3-phases r reclosed

Answer / vinod

Auto reclose is using in transmission line circuit breaker
with selection of single phase, three phase or single and
three phase.

In transmission line there is chance of momentery fault,
based on the area and lenth the time and times of auot
reclose being selected.

Answer / tarun purohit

When any fault occures in line,the circuit breaker trips the supply off to the line.This is called the auto reclose system in Circuit breakers.

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

1 Answers  

---

Can anyone send details regarding motor protection relays ? their manuals please ?

1 Answers  

---

Why Capacitor & ignator used in MH lamp

2 Answers   Bell,

---

stand by earth fault protection (51G) for transformer rating 2000 kVA,Dyn11,33/0.400 V. LV NCT ratio and necessary resistor and metrosil values how to calculate

1 Answers  

---

what will happen if one of the phases from a 3-phase motor is disconnected?? stop/run at 2/3rd speed or run at same speed????

3 Answers  

---

what are the types of Distribution transformer vector group please explain

7 Answers  

---

why vacuume circuit breaker is not used for EHV

3 Answers   College School Exams Tests, Crompton Greaves,

---

WHY WE CAN GENERATE POWER IN 3PHASE MODE ONLY NOT IN 4 OR 5 PHASE?

8 Answers  

---

How you calculating the 30 Hp 3 phase AC motor of power what size of cable is used for this motor?

1 Answers   Dhanam Enterprises,

---

10Hp, 3-phase, 415v, 50Hz induction motor. The above motor is to run on Star-Delta connection, so how do i make following hardware selection 1) MCB, 2) Contactor, 3) Wire Gage (Depending on P-P current or Line Current), 4) OLR, Please tell in detail how to do the above, so as to get the ans. of it even if the Hp rating changes.

1 Answers   Engro,

---

why we need the starters for motors

1 Answers   L&T,

---

write circuit diagram for a motor rotate in forward direction once it started and when pressed the same button it should rotate in anticlockwise.

1 Answers  

---