HOW DOES THE PERCENTAGE DIFFERENTIAL PROTECTION WORK IN
POWER TRANSFORMER
- 1 Answers
- 5527 Views
- I also Faced
- E-Mail Answers
Answer Posted / raghavendran.r
In percentage differential relays, the current from each
current transformer flows through a restraint coil. The
purpose of the restraint coil is to prevent undesired relay
operation due to current transformer errors. The operating
coil current | i1 - i2 | required for tripping is a
percentage of the average current through the restraint
coils.
i1-i2 >=k(i1+i2)/2= k*iavg
where k is the proportion of the operating coil current to
the restraint coil current. For example if k = 0.1, the
operating coil current must be more than 10% of the average
restraint coil current in order for the relay to operate.
| Is This Answer Correct ? | 4 Yes | 0 No |
Post New Answer View All Answers
from generating station If 400v LT line length is 1000m how much voltage is drop and how do i calculate it? which cable will be use for this line?
Let me know that how i calculate the alternator sub tranciant reactance and tranciant reactance.
Explain the difference between verilog task and verilog function?
can anybody send me syllabus of rrb section engg (electrical). and also send previous question pepar...
Why do power lines not short out when they fall into water?
What is the formula of frequency ?
Give the expression for the frequency of oscillations in an op-amp sine wave oscillator?
i want to know that how the height of Ct ,cvt ,LA calculated on the basis of creepage distance
How to connect the chemical earthing and complete process tell me plz
What are linear and non-linear systems?
how does the rotating m.m.f is produced in the 3-phase induction motor and how the poles are created in 3-phase induction motor ?
Why field rheostat is kept in minimum position?
We need to current density & short circuit calculation at 65kA for aluminium & copper busbar.
Dear sir my name Ankit i m Diploma holder present working in Welspun Corp ltd Anjar as Asst.engg (salary 14400/month ctc) i Would like to change my company also i have selected in ford India pvt ltd Sanand as trainee Tech with salary 12000/month so please suggest me for changing my job hope for *ve response
What is the minimum distance to be maintained in between HT panel and LT panel and Instrument panel as per IEC and NEC standards?
