Answer / m.s.srinivasan

Functioning of the RCCB as well as ELCB are the same.
A CT is used to measuer the difference of current in the
circuit being protected. For that all the 3 cores + neutral
of the circuit is passed thro' the CT. For a normal healthy
circuit, difference of the net current will be Zero. Hence
the CT will not sence any current. When the current passing
thro the CT finds a path thro' the some other way ( by
earth ) , an unbalance is created and the CT sences the
unbalance and actuate a trigger to stop the power flow.
The unbalance current over which the RCCB to operate is
given for individual device. Normaly this would be
30ma,100ma,300ma and the selection of the devices is based
on the application.

please send privious years question papers of jindal steel and power ltd.My e mail id is rajanikant.sngh@gmail.com

0 Answers   Jindal,

---

what is subtransient , transient and steady stateac components

0 Answers  

---

hi i m going to attend bhel interview on 22nd sep 2008 for ET(electrical engineering).pls guide me how to prepare for the interview.i am a fresher.

1 Answers   Bhel,

---

What are protection of power transformer?

1 Answers  

---

WHAT IS VFD,FUNCTION, PURPOSE,

2 Answers   RasGas,

---

How would u describe the function of a generator & motor?

5 Answers  

---

Do you need any help with FEWA Electrical Supervisor exams?

0 Answers  

---

What meant by XLPE cable

3 Answers  

---

Discribe type of fault in DOL and stardelta startor.

0 Answers  

---

I have a 1000 kVA Transformer(11kV/0.415kV) and a APFC panel of 400 kVAR(LT).Now if i want to remove the LT APFC panel and install a HT(11kV) APFC panel on the HT side is the HT APFC panel will work same as the LT APFC panel(improve the power factor),if yes what will be rating of the HT APFC panel?what is the formula to calculate HT APFC panel rating???

2 Answers  

---

A 400KVA ,50HZ TRANSFORMER IS TO BE OPERATED AT 50HZ.THEN KVA RATING OF THE TRANSFORMER?.

4 Answers   GATE,

---

voltage of a ckt is measured by volt meter having an input impedence camparable with the out put impedance of the ckt Eror caused is 1. Gross Error 2. Errors due to lloading effect

2 Answers   GATE,

---