WHAT HAPPENS IN DIFFERENTIAL PROTECTION IF CT REACHES ITS
KNEE VOLTAGE POINT?
Answer Posted / tony
Normally the knee point voltage must be
Vk > 2*Vs
Where Vs is the calculated max. voltage appears across the relay.
Beyond knee point the chara of CT is no longer proportional to the primary current and this cause faulty measuring by relay.Thus if we have higher Vk we can easily with stand higher Vs(fault equivalent seen by relay)
Is This Answer Correct ? | 0 Yes | 0 No |
Post New Answer View All Answers
how electrical earthing maintenance done in industry?
what is th basic difference between a d latch time line and a d flip flop time line???
what is the clear formula to calculate cable size for a load
Readings of ER300P Trivector meter
Draw the wave shape of armature current in a generator subjected to a sudden three phase short- circuit at its terminals. Define various reactance of generator from this wave shape.
How many double suspension hardware fittings are required on a double circuit transmission tower?
Hi all I had applied for the RRB test in the ELECRICAL category. I would be pleased if any of you can sent me previous year question papers. Please forward the question papers to varshashahi@yahoo.com Thanks and regards Varsha
Explain bypass capacitor?
WHAT IS THE DIFFERENE IN ACTION OF MCB,MCCB,RCCB
What is the formula for calculating no-load current?
Define branch?
What is the height of DA, DAL, DB, DC & DDE tower?
describe the Operation of induction generators from bus bars
how to convert lv line to hv line and viseversa, any losses will occur during this process
Dear Mr B C pal...Can you plz. put some light on principle of operation of Z-Ct in conjunction to its use with 1Cx1000Sqmm HT Cables & Directional Ground Fault / Over Voltage Relays...Regd..Parag v K 9899115632