Answer / v.selvakumar

mccb is a protect device,whenever short circuit fault
happens ,it will isolate healthy system from faulty system
due to heavy .changing the phase neutral in circuit not a
fault,it will work as normal circuit.

Answer / pratheesh

What Mr.Rajan mantioned is not correct. Core Balance CT,
CBCT (Also called as Zero CT)is used for detecting the
earth fault current.
MCCB is a protective device by sensing the load current. By
interchanging the Phase and Neutral wires, there will not
be any difference in the load current.
So MCCB will trip on higher load current such as overload
or short circuit.

Answer / rajan.l

Shunt Trip Coil is not connected with a core balanced CT

Answer / basayya hiremath

mccb is protectve divise over load and shotr ckt,dipinding
ka rating of the mccb supose 25 ka mcc using this mccb
withastading ofthe current up to 25ka .u whant when phase
and nutrul shotr downstrim side using the mcb this will
trip u what to nutrul protect or earth fualt u can use cbct
incomming side of the mccb with shunt coil in side the mccb
and defending opan idmt curv

What is meant by celling voltage & current in excitor ?

0 Answers  

---

1KVA transformer of different frequencies of 50hz,100hz,500hz&1000hz. which one of these transformer has big size? Give reason

16 Answers   Ecil, Engineers India, MahaDiscom,

---

What is the HVDC Transmission System? What are the conditions applicable to lay an HVDC Line?

0 Answers  

---

Advantages of low voltage drive (control panel)

1 Answers   ABB,

---

1. what is the power factor of a purely inductive load? (i) Zero (ii) Lagging (iii)Leading (iv) Unity 2. which type of transformer connection is preferred in case of power supply transformer? (i) Star/Star (ii) Delta/Delta (iii) Star/Delta (iv) Zig Zag/Star

2 Answers  

---

what happens when back feeding supply accidently collapses with normal supply ??? How?? [that is sometimes in a substation 11kv feeder if their ws long time permit work, back feeding supply will provide from nearest substation... if accidently after the permit work,they charged the feeder without removing back feeding wat will happen...?]

1 Answers   KSEB,

---

In power generator sets, when they are coverted from 50hz to 60hz, the kva rating after conversion increases. For example, the manufacturer of a perkins 200kva @ 50Hz generator set has mentioned it to become 220kva after converstion to 60hz. What is the relation between the frequency & the KVA rating. Any formula please.

3 Answers  

---

how will you find out the fuse failure by remote operation?

1 Answers  

---

how to calculate optimum loading for transformer?

6 Answers  

---

how DC is differ from AC ? what are the difference between them ?exept (P-N)&(+__-)

2 Answers  

---

what is relay multiplier

1 Answers   Atomic Energy Commission, Bhel, Wipro,

---

what is REF relay?

1 Answers  

---