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Current Transformers (C.T)

 
Current Transformers (C.T)

Bar Primary ring type current transformers are secondary coil wounded on a torroidal core if high permeability silicon steel. The conductor through which the current is to be measured is passed through the hole of the current transformer. This conductor acts as primary winding and generates proportionate low current in the winding wound on the ring of the current transformer. The windings of the current transformer provides lower proportional current which can be easily measured by the measuring instruments. Current Transformers also isolate measuring instruments and protective devices from mains and higher voltages.

It is easier to measure high current without breaking the bus bars or cables by means of bar primary current transformer, which can be supplied over the bus bar, or cable. These CT’ are sturdy, compact and economical.

The secondary of CT’s should not be open circuited when primary is energized as it may harm the operator to high voltage.


 
RATIO


RATED BURDEN IN VA ACCURACY RATIO


RATED BURDEN IN VA ACCURACY

ID OD HT


ID OD HT

50/5A 30 85 50 5 5.0 500/5A 60 105 35 15 1.0
60/5A 30 85 50 5 5.0 600/5A 60 105 35 15 1.0
100/5A 35 95 50 5 1.0 800/5A 105 140 35 15 1.0
150/5A 35 95 50 5 1.0 1000/5A 105 140 35 15 1.0
200/5A 50 110 30 10 1.0 1200/5A 105 140 35 15 1.0
250/5A 50 100 30 10 1.0 1500/5A 115 165 35 15 1.0
300/5A 50 100 30 10 1.0 1600/5A 115 165 35 15 1.0
400/5A 60 105 35 15 1.0 2000/5A 115 165 35 15 1.0
 
 
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