WHY SECONDARY OF CT SHOULD NEVER BE KEPT OPEN CIRCUITED?
Answers were Sorted based on User's Feedback
Answer / mondo
When the secondary of a CT is open circuited, it creates a
very large voltage across the CT. That is why if there is
no burden on the CT, it should always be shorted.
Is This Answer Correct ? | 25 Yes | 2 No |
Answer / solanki
one of my frnd says rite that there produced a very high
voltage across the secondary of ct.but from where its
produced no one told.
as all of we know that
E1/E2=I2/I1
FROM THERE E2=E1*I1/I2
BUT IF WE KEEP SECONDARY OPEN THEN I2=0
E2 BECOMES INFNITY
Is This Answer Correct ? | 23 Yes | 1 No |
Answer / 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 |
Answer / shyamsundar nayak
Because there is hevy voltage in secondary........
Is This Answer Correct ? | 5 Yes | 2 No |
Answer / yasmina
CT genarally rated as x/5A,orx/1 A as x value depends upon
full load current, CT Volt amp ( rated VA)is constant on
both primary and secondary ,if you kept open the Secondary
a large value of volatge build up and it is hozordious to
equipment around it and operation people.
Is This Answer Correct ? | 1 Yes | 0 No |
Answer / mit
> if the secondary of C.T. is open then the secondary mmf
will be reduced.
> this secondary mmf will reduced to primary current. so it's
will create a large flux and the heating will also increase.
> and there is possibilities of shock to user so a C.T. would
never be open circuited.
Is This Answer Correct ? | 1 Yes | 0 No |
it ceases the back emf produced by the secondary of ct
this led to heavy inrush of current through primary as
there is no opposing emf
this may harm the person performing the experiment
Is This Answer Correct ? | 3 Yes | 10 No |
IN A HT CABLES i.e. 1.9/3/3 kv, what is the meaning of 1.9 and 3.3.
hi frds, i m electrical engineer.can i get cdr for electrical engineer if u have then send me on my mail id its jayesh_ee88@yahoo.com.please help me frds
in 11kv/400v transformer when only one phase of 11kv supply fails what happens to sec voltage and why
WHAT IS SUBSTATION & ACCORDING TO VOLTAGE HT,EHT SUBSTATION EXPLAIN IT
what is diffence between synchronus and asynchronus AC motor.?
Why MCCB is Getting tripped sometimes when there is no load in the Midnight ?
how the transmission voltage ranges are decided like 11kV,33kV,66kV,132kV,220kV,400kV,725kV.... why not choose the transmission line voltage as 23kV,164kV,440kV?? what's the reason??
Difference between On Line capacitor and Station Type capacitor.
An 8 pole, 50 Hz, 3-phase IM is loaded to a poing where pull out torque will occur. The rotor resistance per phase is 0.3 ohm and motor stalls at 650 rpm. The rotor reactance at stand still is A 2 ohm B 1.25 ohm C 3.15 ohm D 2.25 ohm
what is the current rating of 2500 KVA,33KV/433v transformer on secondary(LT) side
9 Answers Reddy Labs, Vitrum Glass,
tell how current tranfomer works
What happens to the synchronous generator when reverse power is given to it?