Answer / anjireddy boduggam

VCB - vacuum ckt. Breaker , Quenching medium - Vacuum,
ACB - Air ckt. Breaker , Quenching medium - Air,
OCB - oil ckt. breaker , Quenching medium - Oil
above in all ckt. breakers different quenching medias are
using.
The above all ckt. Breakers principle is same, but medias
are used for arc quenching purpose.

OLR - over load relay , when current exceeds over setting
point, then action will be started and disconnected the
load supply by relay action.No medium is used in the OL
relay, but it works on bi-metallic action.

Answer / zubair

ACB MEAMS AIR CIRCUIT BREAKER.
VCB MEANS VACCUM CIRCUIT BREAKER.
OCB MEANS OIL CIRCUIT BREAKER.
ALL THE ABOVE USED TO TRIP THE CIRCUIT,WHEN EVER THEIR IS A
FAULT AT THE LOAD SIDE, like short circuit,excess current
consumption beyond the rated value
THE DIELECTRIC STRENGTH OF VCB IS HEIGHER THAN ACB.THE ARC
EXTINGUISHER CAPACITY OF VCB IS HEIGHER THAN ACB.HENCE VCB
IS USED FOR HIEGHER VOLTAGES AND RATINGS.
THE OLR(OVER LOAD RELAY)IS ALSO USED TO TRIP THE
CIRCUIT ,WHEN EVER THE LOAD TAKES HIGER CURRENT BEYOUND
RATED VALUE, BUT THE APPLICATION IS LIMITED TO 20A.

Answer / sanjay kumar

Transformer Mai oil konsa hota Hai Transformer oil temperature winding temperature kitna hona chahiye on load

Answer / priti ranjan mohapatra

V.c.b - it stands for vaccum circuit breaker. It used in mv line as 36, 33 kv. In this the contact point of the cb remains in vaccum when it is off.

Hi Friends pls give information regarding BARC written test. am attending by 20-5-2008. mail me to kkumarei@gmail.com or message to 9962122264

2 Answers   BARC,

---

why we use ac as a electric appliance in home or daily use?

1 Answers   MNC,

---

i want to estabilish an loss energy storage system,such that it can store electricity lost during the transmission of electricity in conductor,so that this system stores energy lost during transmission and supply it to street lights during night

2 Answers  

---

What is the effect of interchanging core(made of steel) and winding(made of copper) material in case of transformer? Give proper explanation in regard to different losses in transformer.

1 Answers  

---

sir, i am 3 years diploma course pass out candidate.what type of certificate can i got in marine service.

1 Answers  

---

why the energy meter disc rotates anticlockwise while reading

1 Answers   KSEB,

---

explain the what is a drive ? 0 4 which type motor r use in the celling fan..... PCB plannet 2 13 If stator & rotor of a 3-phase induction motor have different no. of poles, will the motor run or not?? types of drives Why dc supply is used for closing and tripping coil of ht breakers. What happen if we use only ups ac supply only. ACC 1 41 how the 3phase induction motor is running in 2phase supply with help of capacitor? 1 33 what is the actual difference betwen constructional details and constructional features? 1 20 how does commutator convert a.c to d.c?

1 Answers  

---

how to calculate the power loss of cable?

1 Answers  

---

What are the factors which influence the choice of specific magnetic and electric loadings of a synchronous machine?

1 Answers  

---

Why derating factor os applied on Cables?

1 Answers  

---

why we are caling 440 volt 3 phase supply instead of 660 volt 3 phase supply? because each phase as a voltage of 220 volt. if anybody know the answer for my question please send it to my mail id. thank you.

3 Answers   College School Exams Tests, Jindal Steel and Power, JIOL, NEC,

---

What is Icu and Ics and what is difference b/w them. please tell me how to calculate a size of a copper bar for a system or a breaker... reply on... king.arish@gmail.com would be waiting for a logical answer.

1 Answers  

---