At the time of 1st
charging of
transformer, there
were huge inrush
current, so why at
that diffrential relay
are not operated? Why?
- 3 Answers
- 7697 Views
- Adani, I also Faced
- E-Mail Answers
Answer Posted / vinod
During the first charging of transformer the magnetising
inrush current is second harmonic, differential relay is
provided with second harmonic trip by pass with sufficient
time. Also 87 relay having 5 th harmoninic by pass during
lightning surges.
| Is This Answer Correct ? | 5 Yes | 1 No |
Post New Answer View All Answers
PAC and simple Ac different
what will happen if OLR CT in all phases are short circuted
What do you mean by Frame 5 Gas Turbine as well as Mark II.
What is the types of HT motor testing
how to select automotive wire by mathematical equation with given current, vlotage and resistance
How to know Resistance and Reactance value of main and aux winding of single phase capacitor start capacitor run induction motor to find capacitor value?
In case of generator when we consume more power produces by it why load on generator increase and starts sound more. and how it is adjusted..
In constant power region of 3-phase IM torque-speed characteristics, if frequency increases flux A does not alter B decreases C increases D none of above
What is inrush current? how can calculateit? what is the affect of it?
Explain the construction of the conservator, operation and purpose, and draw the diagram of the conservator.
HOW DO I CALCULATE THE SETTINGS FOR THE DIFFERENTIAL PROTECTION OF A 12kV/6.6kV, 6MVA,DYN11 XMER WITH PRIMARY SIDE CTR 400/1 AND SEC SIDE CTR 600/1?
Advantage of LT panel vs HT panel
what is thermal resistance of PVC Cable.
In Plumbing services What are accessories we consider for a bathroom?
If Polarization index of motor 8.75 at 500volts of medium voltage 4.16 KV motor what this mean winding good or bad pl answer if any reffrence book give me the link
