CT ratio to Current Calculator:
Enter the values of CT ratio, CT and secondary current, Is(A) to determine the value of primary current, Ip(A).
CT ratio to Current Calculator Formula:
The Current Transformer (CT) ratio is a measure used in electrical engineering to step down high current levels to a lower, manageable value for measurement and protection purposes.
It defines the relationship between the primary current (high current) and the secondary current (lower current) in a current transformer.
Primary current, Ip(A) is the high current flowing through the primary winding of the CT, typically the main circuit or power line.
Secondary current, Is(A) is the lower, scaled-down current produced in the secondary winding of the CT, which is used for measurement or monitoring.
CT ratio is the ratio of the primary current to the secondary current. It indicates how many times the primary current is reduced to obtain the secondary current.
Primary current, Ip(A) in amperes is calculated by the product of CT ratio, CT and secondary current, Is(A) in amperes.
Current, Ip(A) = CT * Is(A)
Ip(A) = current in amperes, A.
CT = CT ratio.
Is(A) = secondary current in amperes, A.
CT ratio to Current Calculation:
- Calculate the primary current for a current transformer with a CT ratio of 100:1 and a secondary current of 5 amperes.
Given: CT = 100, Is(A) = 5A.
Current, Ip(A) = CT * Is(A)
Ip(A) = 100 * 5
Ip(A) = 500A.
- Suppose the primary current is 2000 amperes and the CT ratio is 250:1. Calculate the secondary current.
Given: CT = 250, Ip(A) = 2000A.
Current, Ip(A) = CT * Is(A)
Is(A) = Ip(A) / CT
Is(A) = 2000 / 250
Is(A) = 8A.