Answer / nithi

when SEC of the CT open circuited,
1.high-voltage buil-up in the sec side
2.core saturation-over heat-result in fire(if
prolonged).
these things will not happen in ordinary
transformer.because,
PRIMARY CURRENT IS REFLECTION OF SECONDARY
CURRENT.SO,WHEN THERE IS NO CURRENT IN sec SIDE,ONLY NO-
LOAD CURRENT WILL FLOW IN PY WINDING.BUT IN CASE OF CT,PY
CURRENT IS INDEPENDENT.SO,IF SEC OPENED,NO DE-MAGNETISING
EFFECT &FORCED TO OVERFLUXING CONDITION.

Answer / pritam upadhyay nit p

when secondary is open there ic no flux due to secondary
current to oppose flux due to primary so due to high flux
there is very high voltage induced on secondary side which
causes sparking and damage of core due to high flux demsity.
in case of power transformer flux is constant whtheer
primary open or not so there is no such case as in ct..

Answer / bhatt

If secondary of CT is opened and as we know that primary
always flow the current and by transformaton action
secondary must flow the current but in our case secondary
is opened hence Extra high voltage is induced in terminals
of secondary which can be fatal.
In case of ordinary transformer if secondary is open
primary flows only no load current hence secondary voltage
is only rated secondary votage which is not as danger as in
the case of CT.

whats the differece between Exd and Exe

0 Answers   IFFCO, TN,

---

What is the following which is printed on electrical appratuses like AC21 ,AC 23 , etc ?

1 Answers  

---

What is meant by turbo alternators?

0 Answers  

---

Ceiling Fan and Storage type water heater. Discuss

0 Answers   Satyam,

---

How can I calculate the require lumen of a room. If I use Tube Light (40 W), Or 100 W incandescent lamp. Please give detail answer.

1 Answers  

---

How to Preparation of online test

0 Answers  

---

List advantges of active filter over passive filter?

0 Answers  

---

For an 100kw generator, only 50kw of load is connected. Will the generator generate only 50kw or 100kw. If it generate 100kw what happens to rest of the 50kw. What happens if we connect more than 100kw of load?

2 Answers   L&T,

---

What is the tipical Online UPS input voltage for 20 KVA load ( 3 Phase or 1 Phase )? Why ? Explain it...?

0 Answers  

---

why d.c produces corrosion

0 Answers  

---

Classify drilling machines.

0 Answers   Ashok Leyland,

---

where we use 1 phase & 3 phase supply ?what is major advantage using 3 phase over than single phase ?

3 Answers  

---