Interested to Buy Any Domain ? << Click Here >> for more details...
WHY SECONDARY OF CT SHOULD NEVER BE KEPT OPEN CIRCUITED?
- 7 Answers
- 13823 Views
- I also Faced
- E-Mail Answers
Answer Posted / shashi
If secondary is opened while primary wdg carrying current, then secondary MMF reduce to zero while primary MMF is same.Consequently, the resultant MMF which is equal to primary MMF(as secondary MMF is zero)is very high and it will induce very large flux in the core till core saturates and when this flux links with secondary winding a very high voltage will be induced in secondary wdg .So,
1) This high voltage can breakdown the insulation of secondary wdg.
2) High voltage may even cause fatality to operator who opened the secondary wdg.
3) High resultant flux in core will cause high eddy current loss and hystersis loss .Thus, transformer will get overheated and damage permanently.
4)The high flux will make core permanently magnetised .So, residual flux will introduce error in measuring device.
| Is This Answer Correct ? | 4 Yes | 0 No |
Post New Answer View All Answers
What is the formula to calculate a three phase alternator
operation of protection relay watchdog contact?
What is the relation between frequency and motor rpm?
how to prepare the technical test
what are the values of VRY,VYB,VBR,Vry,Vyb,Vbr,Vrn,Vyn,Vbn for Magenetic balance test of 100 KVA and 63 KVA Distribution transformer
how to calculate the size of the HT cable
how maney type tempereture measurement ?
1. Why is the speed of shunt motor practically constant? 2. Why dc series motor use to start with heavy loads? 3. advantages & disadvantages of separately excited generator over self excited generator?
How to Calculate The Neutral Earth flat design calculation for the Synchronised generator (Gen 1-650Kva, Gen 2-725Kva
hi pal, i am vengatesh from tamilnadu(chidambaram),i have called for the written test for the post of jr executive(ELECTRICAL) of AAI ,I dont know about the question paper pattern,so any kindly help me to face the examination,post me the model question papers and some tips to write my examination to (vengi.annadurai@gmail.com)
Why we are using Isolation Power Transformer inplace of commercial power transformer? What's the difference between them?
hi frnds what is meant by harmonics & what is meant by third hormonics,where its will occur ?thank u
What can you contribute to the progress of our Company as an employee if you are selected?
what r the checklist while installing a 380 kva DG set
What Should be the value of Vector Surge angle at Tripping and how to calculate it?
