Electrical Engineering ⇒ Topic : Current Transformers (C.T.)
|
Sachin
| |
Current Transformers (C.T.) Just as a shunt extends the range of a D.C. ammeter, so does the current transformer perform the same function in A.C. circuits. Thus a high magnitude alternating current can be easily measured by a combination of a current transformer and a low range ammeter Fig, (a)Line conductor acting as priinary. Fig. (b) Current transformer connections. The primary of a current transformer (C.T.) consists of a few turns of thick cross-section connected in series with the high current line. Very often the primary is just one turn formed by taking the line conductor through the secondary winding Fig.(a). The secondary winding consists of a large number of turns of fine wire designed for either 5 A or 1 A rating. Thus a current transformer is step-up transformer. The current transformer has the secondary effectively short-circuited through the low impedance of the ammeter. Fig.(b) shows the current transformer connections | |
| |
!! OOPS Login [Click here] is required for more results / answer