Communiquez avec les autres et partagez vos connaissances professionnelles

Inscrivez-vous ou connectez-vous pour rejoindre votre communauté professionnelle.

Suivre

When the flow of power reverse on a transmission line what effect will it do to the star point of the CT?

user-image
Question ajoutée par Manzoor Alam , Manager , K Electric
Date de publication: 2014/04/25
Mohamed Shafik
par Mohamed Shafik , Sales and Application Manager , IPS GmbH

Star point of a CT is a fixed installed  point (Toward Bus  or Towared Line) power flow does not affect the Star point of the CT

Himadri Roy
par Himadri Roy , MANAGER ELECTRICAL , STEAG ENERGY SERVICES

In case of3 O/C,2 O/C &1 Earth fault, REF, Standby Earth Fault, or in case of NPS Protection We take All3 Phase Strating END/ Finishing End /Both the End(REF) in Star, to get normal Current flow in the Relay & Excessive Current flow in Fault Condition

As we know CT Current will flow in Opposite direction of Power Flow.So it will not effect the Star point OF CT( CT Srar allways Grounded), But the change of Direction of Power Flow defenetely will going to affect in Case of Diection Relay.

2nd:- Suppose Power flow is from P1 to P2. that time connected Energymeter will show the added parameter like KWH,KVA,KVAR etc. But if Power flow reverses energymeter will not add, because all the CT current will come to STAR poiunt of CT & will become Zero.

In case of Differential Relay Power flow will trip the relay by adding I1 + I2 = some value more than Trip Set Value/ Bias value ( Basically in case of Zone Fault )

Mohamed Elzubier
par Mohamed Elzubier , Technical Manager , BARBAR PLastics Industries Factory

star point will still be neutral or at least unchanged. But you will get a reversed phase sequence. That what will happen in case of reversal of power flow, only.

More Questions Like This