Answer / iamdon

The CT secondary should not be left opened secondary due to
following reasons:

1)Zero current in secondary leads zero back emf.So primary
current becomes very high.Large heat generated may burn the
winding and core.If the transformer sustain this heat, even
then its operation becomes improper as explained below.

2)CT is bascially a step up transformer.So high voltage
induced in secondary may saturate the core (core becomes
permanently damaged).So the operating point advances in non
linear region,which makes the transformer operation improper
(secomdary current will not replicate the primary according
to the turn ratio).

3)High voltage induced in secondary side may endanger the
life of personnel working on the side.

Author:arbelectbit@yahoo.com

Answer / bhautik patel

due to the absence of the counter ampere-turns of the secondary, the unopposed primary mmf will set up high flux in the core which will produce excessive core loss with subsequent heating & high voltage across the secondary terminals.

STATE AND EXPLAIN SUPER POSITION THEOREM.

3 Answers   ABB,

---

why ht motor connection in star

10 Answers   Suzlon,

---

what is the advantage of NiCd battery over Lead acid battery?

2 Answers   BARC,

---

One Township having 850 house and each house load is 2.2KW single phase & 5HP 3 Phase motors of 10 Nos .Who can calculate 11 KV transformer capacity .dilip_bhasker@yahoo.co.in

1 Answers  

---

Why a transformer is rated in kVA and not in kW??

9 Answers  

---

Why are you like to join it job as a electrical engineering student?

4 Answers   Bhushan Power Steel,

---

1. Can a 12v DC choke operate a 60v/12w PL lamp ? 2. Can a 230v ballast fire / operate a 60v/12w PL lamps.

0 Answers   ICS Integrated Computer Solutions,

---

What is the permissible value of earth resistance and as per which standard / act / rule ?

3 Answers   HBL Power Systems,

---

Which motor is 3.3 or 11kV more reliable, in terms of efficeancy,maintenance, reliability.

0 Answers   Megatron Solutions, TCL,

---

What is the difference between LT & HT Cable

4 Answers   ETA,

---

in dc series motor if field wdg is shorted then

0 Answers  

---

I am completed DEEE in tamilnadu, now i am working in andhrapradesh with 2.5 year experience in relavent field. capacity of the tranformer is 11KV, 1MVA Transformer, i am eligible for getting c licence in andhrapradesh pl help me.

0 Answers  

---