phase association of 3PH L&T static CT meter is wrong. means 1PH & 1 C

phase association of 3PH L&T static CT meter is wrong.
means 1PH & 1 CT connected properly and other 2 voltage and
CT's inter changed. what would be the impact in the reading?

Question Posted / tonykeeranchira

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phase association of 3PH L&T static CT meter is wrong. means 1PH & 1 CT connected properly..

Answer / manjunath tc

Phase angle error will come into picture and meter will record slow.

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0 No

phase association of 3PH L&T static CT meter is wrong. means 1PH & 1 CT connected properly..

Answer / shankar

Lets us understand this problem by taking load as constant and the incoming supply initially it was RYB in sequence.
let Vr=10<0 Ir=5<-10
Vb=10<-120 Ib=10<-20
Vc=10<-240 Ic=15<-10
Now the total power is P=VrIrcos(-10)+VyIycos(-140)+VbIbcos(-250).
=41.5 watts.
Now lets us consider Y and B phases were wrongly connected to each other
Vr=10<0 Ir=5<-10
Vy=10<-240 Iy=10<-20
Vb=10<-120 Ib=15<-10
Now the total power is P=VrIrcos(-10)+VyIycos(-240)+VbIbcos(-130).
=3.781 watts
so the energy meter will records less units

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2 Yes

3 No

phase association of 3PH L&T static CT meter is wrong. means 1PH & 1 CT connected properly..

Answer / surendar

if 415 v is appliex at three phase in your situationi f r phase is right it will get
higher vol. and other two get lower vol....right ans should be all the three
sholud b same

Is This Answer Correct ?

2 Yes

4 No

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