Interested to Buy Any Domain ? << Click Here >> for more details...
Why CT secondary should not be kept open?
- 7 Answers
- 88834 Views
- Anna University, I also Faced
- E-Mail Answers
Answer Posted / achint rajput
A current transformer should never be open-circuited while
main current is passing through the primary winding. If the
load is removed from the secondary winding while the main
circuit current is flowing, most of the primary winding
current becomes magnetizing current, but the vector angles
change in such a way as to keep the total current in the
primary the same as before. Because the main circuit is now
mostly magnetizing current, the flux in the core shoots up
to a high level and a very high voltage appears across the
secondary. Due to the high turn ratio usually found in these
transformers, the voltage in this condition can reach a
dangerously high level, which can break down the insulation.
It also becomes a hazard to personnel. The high flux can
saturate the core and result in strong residual magnetism
left in the core, thereby increasing magnetization current
and introducing error in the transformation ratio. One has
to put a short on the secondary winding before removing the
connections.
| Is This Answer Correct ? | 27 Yes | 5 No |
Post New Answer View All Answers
Why magnetic flux produces an induced current?? what is the detailed procedure ?? ans plz
actually i can't understand what is 3dB ? and it's really not clear to me.please any one let it me be cleared.
What is given by the definition in BIL IMP/PF = 950/395 kV. This was found in a name plate of a power transformer.
What is superposition theorem?
what's the requirement of Dy11d0 connection of 3 phase transformer?what's use of it?
How are load losses and no-load losses measured at site in a DG set?
i need some project topics along with circuit diagram in the electrical adnd electronics engg and also give ome website regarding projects.my mail id is thenmozhi2k7@gmail.com .please help me.
Is a 300w induction motor used in a food processor as powerful as a 1000w DC motor.
What Maximam Gap Taibaar & Bush
What is dc current source?
Why the efficiency of a three-phase induction is the motor is less than that of a three-phase transformer?
State the points to be considered for selecting a particular type wiring.
Define characteristics impedance?
What is maximum power transfer theorem?
What is T’Q and X’Q and X’D ? and what is saturated as well as unsaturated ?
