Answer / srinivasan.

open-300 millisec-Close /open-3min-Closeopen - means the
circuit breaker is capable of performing the above
operations even at full shorcuit currents.
At the same time the circuit breaker should not be allowed
to operate lesser than these timings.For example open-20
millisec-Close open-1 min-close/open.

This type of breakers are called single shot autoreclose
breakers.
Immediately after a fault breaking,we can do close open the
circuit breaker.

This sequence is tested during type testing only.

Answer / k.prakashchandra

CO means closing followed by opening.

what is mean by VCB colour code..???

1 Answers   Student,

---

AC SUPPLY HAVING 230 V FREQUENCY REDUCED ZERO IF MEN TACUCHES THE SUPPLY WEATHER HE GETS SHOCK OR NOT?

8 Answers  

---

how to find out 3 phase complex power in per unit in unbalanced system?

0 Answers  

---

what is the purpose of shading ring or shading coil in electrical equipments.

0 Answers   BARC,

---

What is the method to solve circuit using source transformation?

0 Answers  

---

Why a tesa lamp is glow between two phase?

0 Answers  

---

How can you limit the fault level in a power system?

1 Answers   Alfanar,

---

Why IGBT is very popular nowadays?

3 Answers   TVS,

---

What is A check, B check, C Check & D check for a diesel Generat

0 Answers   Jtekt Koyo Bearings,

---

why we step down voltage level from 33kv to 11kv and 11kv to 415v.Instead we can step down voltage from 33kv to 415v directly using single transformer?

3 Answers  

---

what is corona

3 Answers  

---

What magnetic circuit is formed in berry-type constructions and why?

0 Answers  

---