WHAT HAPPENS IN DIFFERENTIAL PROTECTION IF CT REACHES ITS
KNEE VOLTAGE POINT?

Answer Posted / rukmagoud

Differential protection requires two cts for its connection.
If one of the CT reaches its Knee point voltage , then the
CT Enters into Saturation. so when Ct is in Saturation
state, its characteristic changes, i.e the current will
not be proportional to primary current thereby
differential current comes into picture in differential
relay , there by there is a chance of maloperation of relay.
This usually comes when there is any through fault.

rukmagoud
APGENCO/NAGARJUNASAGAR

Is This Answer Correct ?    49 Yes 1 No



Post New Answer       View All Answers


Please Help Members By Posting Answers For Below Questions

what is mean by dry frequency

2115


There are different classes of protections in power plants.class a,b,c are clear..is there any class d and e r there..and elaborate class b protection.

1821


Please sent me some previous year question papers of BSNL-JTO telecom and RRB in ELectrical Engineering to varshashahi@yahoo.com

1770


why do we put a transformer on soak before loading it

839


What is difference between insulating medium and fault current interruption medium in a switching device.

1327






1. What is the exact formula for one weber? for example,(one ampere = one coulomb electron of electrons crossing a point of conductor at one second. i.e, 1A=1Q/1sec)

1618


what is advertised hop count

1489


As we use capacitior bank in 3ph ckt for improvement of PF, why not we use capacitor in single phase domestric use, at our house their are many inductive equipments,like fan,mixer,tube choke,air conditioner they also draw PF... by using capacitor can they improve PF. if yes--what are advantage and how to connect a capactor in single ph,and which type of capacitor if no- what are disadvantages.

1580


What is shunt voltage and u v voltage witch one best

1469


sir please send me techinical questions for junior engineer posting in bangalore railway i am diploma holder

1755


What the difference between three phase contactor (coil 110vac) & three phase SSR (control voltage 110Vac)? May I use contactor in place of SSR?

1842


Define norton equivalent circuit?

787


WHY CBCT USE ONLY IN Y PHASE NOT OTHER PHASES

1790


Write down the name of 2 lady Bir Pratin of Bangladesh

1716


Is there any Electrical supervisor license which gives permit to work whole India rather than individual state??

1601