If a current transformer has a rating of 4000:5 and 2000 amps load is on the primary, what would be the secondary output?

To determine the secondary output of a current transformer with a rating of 4000:5, you can use the relationship between primary and secondary currents based on the transformer's turn ratio. A rating of 4000:5 means that for every 4000 amps in the primary circuit, there are 5 amps in the secondary circuit.

First, we need to identify the full scale for the primary and secondary currents. The primary current is 2000 amps in this scenario. To find the secondary current, you can use the following formula:

[ \text{Secondary Current} = \left(\frac{\text{Secondary Rating}}{\text{Primary Rating}}\right) \times \text{Primary Current} ]

Substituting the values we have:

[ \text{Secondary Current} = \left(\frac{5}{4000}\right) \times 2000 ]

Calculating that gives:

[ \text{Secondary Current} = \left(\frac{5 \times 2000}{4000}\right) = \left(\frac{10000}{4000}\right) = 2.5 \text{ amps} ]

Thus, when the primary current is 2000