Answer / lalit barsker

vacuum circuit breaker is a device which is used to isolate
the faulty part of the power system from healthy part of the
power system & is used in switchgear.WHEN WE WANT TO SERVICE
OR MAINTEINANCE OF ANY SUBSTATION OR WANT TO CLEAR THE FAULT
DURING THAT CONDITION WE CAN ISOLATE THAT PART OF POWER
SYSTEM SO THAT WE CAN WORK IN THAT CONDITION ISOLATOR IS
OPEN AND SUPPLY CAN BE INTERRUPTED.

Answer / purushotham naidu.

Vaccum circuit breaker,as the name indicates is used to
break the circuit in faulty conditions and Arc quenching
medium is Vaccum. Isolator, as the name indicates isolates
the part of the system on occurence of fault without
actually being quenching/interrupting the arc....

Answer / mahesh m

The vaccum c.b are used to dissconnect the ckt when fault
accurse in the ckt,aswell as the vcb is used to break the
ckt in abnormall condition,in tn the name indicates the
isolators are used to isolates the ckt and the supply can
be intterupted by the mains.

Answer / ramakishore karri

the purpose of the vacuum circuit breaker is to isolate the fault system after the occurance of the fault. So that circuit breaker contacts open, in case of isolator it isolate the power for maintenance of the sub station as u like depends on us and it should not require any relay for finding the type of fault and interrupt the supply. In case of circuit breaker relay is required for finding the type of fault and it interrupt the circuit breaker.

Input power is 380 - 450 V but with 45 - 55 Hz frequency - desired output is 415 V and 50hz with 1% variation permissible. CVT / Servo dont stabilize the Frequency - what is best solution??

7 Answers   IOCL,

---

What is the maximum current carrying capacity for both copper and aluminium cables for 1sqmm?

2 Answers  

---

what is ups?how its works?and what is there in static switch how it works?

2 Answers   Bhel,

---

how can we say that stator magnetic field rotates with synchronous speed?can we derive?

0 Answers  

---

what is meaning of phase angle in two phase.

5 Answers  

---

---

Why delta star trformers are used for lighting loads?

0 Answers  

---

how do i calculate voltage drop-if length is 1000 meter,amps is 160a

1 Answers  

---

if 2 coil of 1000W connect in series and 200 v is applied across it . then what is the total power of coil when coil have only resistive load .

1 Answers   BSNL,

---

How to select a cable size for particular load?

0 Answers   Amit Enterprises, Takasago Engineering, Techno Electric and Engineering,

---

when a airgap of the induction motor gets larger does it draw more current ??? does it power factor gets lower?

3 Answers  

---

What is the function of induction motor when low voltage is apply.

6 Answers  

---

which model T or pie model is prefarable in power syatem

0 Answers  

---