Answer / soumik

if it is open circuited the whole current in the primary becomes magnetising current and a dangerously high voltage will appear across the secondary which will cause insulation breakdown and even something worse.so it,s secondary always kept shorted.

Answer / sandesh

Basic transformer formula:-
Vp x Ip = Vs x Is
Now our Vp > is very less (5 to 10V)
Ip > 2000A
Is > 1A
hence, Vs = (Vp x Ip)/Is
If Ct Secondary open circuited then Is = 0
therfore Vs = ( 5 x 2000)/ 0
Vs = ∞ i.e Infinity.
Which will harmful to Human Being.
Therefor CT Secondary never short circuited.

Answer / leo thomas

In CTs only a negligible part of the primary ampere turns
is used to magnetising the core .Remaining ampere turns is
counter balanced by secondary due to shorted.Once opening
CT in energised condition high voltages presents in
secondary causing faintal shock and the CT core will damage

Answer / joseph

if it is open circuited the whole current in the primary
becomes magnetising current and a dangerously high voltage
will appear across the secondary which will cause insulation
breakdown and even something worse.so it,s secondary always
kept shorted.

Answer / santosh89

yes above answers in context of not being open circuited are true.
But If the secondary impedence is not kept as low as possible(as during short circuit ), then there is a voltage drop across it , which result in a decrease in CTs accuracy.

Difference between single phase and three phase?

1 Answers  

---

What kind of preventive maintenance are there for AC induction motor?

1 Answers   Gulf,

---

considering the 3phase and single phase ac system the load applied and the volage given is same...will the current differs for both the cases are it wil remain same?

5 Answers  

---

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

0 Answers   Jindal,

---

if a motor is running at 1500rpm then how you can find its HP

1 Answers   Construction,

---

---

Why is water motor not taking the pressure? what is the problem?

0 Answers  

---

temp of cast resin 1500kva tx formerwent up to 138.c but came down very fast to about 100.c within 20 mins when load was reduced from 70% to 60%

0 Answers  

---

why is a earth pit 10 ft usually? And, what should be the distance betweeen two earth pit?

4 Answers  

---

Is it required to lay 2 runs of GI wires along with armoured cables from one power DB Machines of higher rating?

0 Answers  

---

We operate a 10 Mw facility and we have been experiencing several trips due to fluctuations on the MVAR? We have checked all issues related to the AVR and we have found all OK? Can anyone help us? The grid voltage, internal voltage, all regular parameters look ok. MVAR fluctuate and there it goes the unit? What could be happening? Thanks!

5 Answers  

---

what is the difference b/w low voltage motors & medium voltage motors

1 Answers  

---

How much RPM in Turbocharger in Diesel engine.

9 Answers   Greaves, MAHINDRA,

---