Answer / waqa ahmed

mcb
miniature circuit breaker
mccb
moulded cage circuit breaker
elcb
earth leakage circuit breaker

Answer / g.t.manikandan

MCB is miniature circuit breaker which is thermal operated and use for short circuit protection in small current rating circuit,Normally it is used where normal current is less than 100A,
MCCB moulded case circuit breaker and is thermal operated for over load current and magnetic operation for instant trip in short circuit condition,Normally it is used where normal current is more than 100A.
RCCB is used to detect earth leakage fault.once there is a ground fault in the load side,current from phase will directly pass through earth and it will not return through netural through RCCB,that means one side current is going and not returning and hence beacuse of this difference in current RCCB will trip and it will safe guard the other circuits for fault loads,that why cost of RCCB also costly

Answer / dixit

mcb
is a circuit protecting device which has a definite current rating which protects selective rating of the MCB which we choose.

MCCB
is also a circuit protective device we can change minimum to maxium value of current rating which can select .

ELCB

which sens the leakage current if any in the circuit,and trip the circuit immediatly

in 132 kv substation ligtning arrestor(120 kv) connected to line. but line voltage comes to 132 kv, it operate or not???

4 Answers   Divis Laboratories,

---

The Howland current source produces a A Unidirectional floating load current B Bidirectional single-ended load current C Unidirectional single-ended load current D Bidirectional floating load current

0 Answers  

---

What core magnetic balance test of transformer? How to do this test in a three phase Star delta (star-LV, Delta-HV) transformer? How to measure and where to measure? thanks and regards Austin

22 Answers   Neutech, Power Grid, TSSPDCL,

---

Can anybody tell me the Electrical IS rules website?

1 Answers  

---

What is the formula to calculate the no load current of a single & three phase induction motor

0 Answers   HCL, Nokia,

---

7. A resistance of 30 ohm is connected across 240v supply. If a resistance R ohm is connected in parallel with 30ohm resistor across the same supply, the current drawn becomes triple of original one The unknown resistor R is

2 Answers  

---

WHY IL=IPH IN STAR AND WHY IPH=IL/1.732 IN DELTA? WHAT IS REASON BEHIND IT?

0 Answers   Siemens,

---

HOW WOULD YOU PRESENT THE POWER FACTOR PRACTICALLY ON A GRAPH

4 Answers   Bhel,

---

1) Why distributiion system decided 11 kv, 33 kv, 66 kv, 132 kv, 220 kv, 400 kv, 2) In 3 Phase line terminal of capacitor, why used for power factor improvement. 3) Why used rating KVA in transformer?

1 Answers  

---

why inverter rating is in KVA

3 Answers   Alstom, JSW,

---

i have done diploma and btech in EE and live in Chandigarh so kindly help me how can i make my competency certificate in my area.

0 Answers   Multi Metals, ONGC,

---

How to make vector group test of transformer?

2 Answers  

---