Answer / k.prakashchandra

Check the DC supply first

Answer / asif khan

I can follow below trouble shooting steps,

check the error code to see if there was any short ckt or
earth fault, if there was (check for cable termination if
the connections are not burnt out due to short circuit,
check earth resistance and current voltage etc. of the
terminals) eliminate the fault then it should work fine.
Check the control wiring of the breaker check the fuses,
contactor operations etc.

check the under voltage release to see if it did not trip
due to under voltage or over voltage. check shunt trip
mechanism.
check if breaker is not overheated as a breaker may not
close if magneto thermal release is tripped.

check closing coil operation and see whether breaker gets
charged automatically with help of the motor.

if none of the above problem found, Rack out the
breaker(keep it in isolated position)trip the breaker
manually a few times and try closing it again should work fine.

In case it does not happen you can try and by pass the
breaker with help of crocodile pin Jumpers ( In case of
Emergency), but one need to be extremely careful and should
ensure that the incomer supply to breaker is turned off
while doing it, as a high risk is involved. Also you should
be confident that breaker did not trip due to an abnormal
condition.


Note: Some breakers indicate nuisance fault as well

Further,

Answer / ramesh arumugam

Please mention the voltage rating and the type of breaker i.e whether ACB or VCB or vcu

i am confused about generator. i have generator of 380 KVA that is 304 KW by that formula KW=KVA*0.8... then by this formula I=KW/V*1.732*0.8 the amperes are 528.673. so that is the load which i put on one phase of generator or this is total 3 phase load on Generator.......

3 Answers   Haliburton,

---

I have 320 Kva DG Set his KWh running is 77 , how i can calculate into electrical unit .

2 Answers   Anuj Enterprises, Schneider,

---

how to do CT Burden test

2 Answers  

---

what is the application of dynamic Breaking resistor in inverter ? & How it works ?

2 Answers  

---

How can we checked Killo Watts of Motor & Alternator?

0 Answers  

---

---

what a function diesel generetaor turbo charger & turbo charger is more heated explain reason ?

0 Answers  

---

What is the basis for selecting Vk/2 or Vk/4 for REF and Differential protection of Transformer and What is the significance of magnetising current

0 Answers   ABB, Jindal,

---

what are the different sizes of U.G. cable & where these cabl;es are used according to voltage ..

0 Answers   HPCL,

---

if voltage is not builed up in small generator what will be the reason?

7 Answers   century,

---

how much test voltage should applied for tan delta test.

2 Answers   Electrical, TATA,

---

we have one 75kw motor 380 volt 3ph amp134 please advise which size of cable required

2 Answers  

---

how to calculate the output power of vfd , please help me.

1 Answers  

---