What is c.t (current transformer)ratio.how to calculate.?

electrical

Answer:
Utilities use CTs because all the power can't be delivered through the electric meter. CTs measure a known fraction of the actual usage.

Common revenue CT sizes include 300, 600, 1200, 1600, and 2000 amps. This is the primary winding rating. When loaded to the nameplate amperage, the secondary current is 5 amps.

The CT ratio is a ratio the primary amps to the secondary amps.

300:5 = 60:1
600:5 = 120:1
1200:5 = 240:1
2000:5 = 400:1

This ratio becomes a multiplier on the customer's electric bill.
current rating of cable x 1.25/5= CT Ratio

Example 200x1.25=250/5= 250:5 CT Ratio

...hope this helps

The answers post by the user, for information only, FunQA.com does not guarantee the right.



More Questions and Answers:
  • What r the qualification for aeronatical engineering?
  • How can I calculate wind force on a surface?
  • In a 3 phase system, on a lighting circuit, fluorescent lights with 4 tubes are they considered one load or 4?
  • I am planning to build a rolling log to help my chanses in ninja warrior?
  • Difference between electrical engineering & electronics engineering?
  • Soil suction? (geotechnical engineers please look)?
  • Stator and generator design say for wind energy?
  • Do you know any man made structures around 2500 meters?
  • Hey if u were me would u study computer science or mechanical engineering. can't decide guys need ur help. dj