Answer / m s venkateswara rao

polarity of the CT secondary is depend up on the polarity of CT primary. For example current flow in primary of a CT is considered from P1 to P2 current flow in secondary will be from S1 to S2. If the CT is used for multi function meter to measure the Active power, apparent power will show negative readings if polarity is changed. If is used for protection and the type of protection is considered is non directional over current/ earth fault there is no difference in CT polarity change. If it is directional over current/earth fault relay will not operate because it will never seance positive value as the protection type is directional.So by changing the polarity of CT, protection for which we opted will defeated.

Answer / digvijay

My question regarding worng connection in any phase of ct,
Is there any effect on power factor of that phase which is wrongly connected

Answer / guest

secondary winding is s.c

Answer / sanjiv c keshari

CT means current transformer are used for earth fault protection and current showing.If polaraty has changed so CT will not work proper it is showing wrong reading.

Answer / monojit dutta

IF POLARITY CHANGES, THE DIRECTION OF THE CURRENT FLOW WILL
ALSO CHANGE.

Answer / lokesh

current will flow in the reverse direction.

Answer / guna

CT - current transformer, other name is instrument transformers, which are used to measure high currents. By depending upon winding ratio (Ex,20:5) it gives the current value at the user end. if we change the polarity means (5:20) either it will show high current nor it can get short circuited due to abnormal current flow on the LT side.

Answer / s.karthik

consider the example of CT with the ratio 50:5.
it means if 50amps is flowing in the primary,it will show
only 5 amps in the secondary.Now when the polarity is
changed,50 amps will flow in the secondary which is
comparatively high,and the windings are designed to carry
only 5 amps and hence as a result the windings will burn due
to the volumenous amount of current flowing throught he circuit.

which is better 50 HZ supply or 60 HZ supply?

6 Answers  

i m in need of current rating chart of heavy duty pvc/xlpe, cu/al cables. can somebody provide me? if yes, plz send me at ashish_patel111@yahoo.com

0 Answers  

Why do we mix soda with water in LRS?

1 Answers  

what ll happen to current if two phases get short circuited

2 Answers   Kirloskar,

What happen if transformer neutral path get removed ?

1 Answers  

What is effect of low pf on HT supply.

6 Answers  

why stator winding of synchronous machine are connected in star connection ?

1 Answers  

why there is a fault occurs, if a phase wire touches ground.. and the fault not occurs when we connect a bulb between phase and ground..??

1 Answers  

What is VFD, and how its work

5 Answers  

two way ckt diagram can be drawn by how many ways? give diagram

0 Answers  

how to set earth fault relay

1 Answers  

In three phase supply why we use R Y B Colour not other.

4 Answers