Question

how current transformer can be used to measure largr RF current?​

Answer 1

Answer:

Rating factor (RF) is a term, which applies to a current transformer.

In its application to a current transformer, it is the number

representing the amount by which the primary load current may

be increased over its nameplate rating without exceeding the

allowable temperature rise. In other words, it is a designation of

the transformer’s overload capability. In order to be completely

meaningful, the ambient temperature at which the rating factor

applies should be stated. The standard ambient reference levels

are at 30°C or 55°C. In the manufacturer’s literature, a typical

statement would be: RF 2.0 at 30°C ambient with RF 1.5 at 55°C

ambient. These statements mean that in a 30°C ambient, the CT

will safely carry on a continuous basis 2 times the nameplate rating

and at 55°C ambient, it will carry 1.5 times the nameplate rating.

It is very important that the ambient temperature be considered

when applying CT’s above the rating. Typical rating factors of CT’s

are 1.0, 1.25, 1.33, 1.5, 2.0, 3.0, and 4.0.

Many times the manufacturer will only list the CT rating factor at

30°C ambient (room temperature). If you wish to know what the

rating factor is at some other ambient temperature, you will have

to convert the value by use of a rather simple proportional equation.

Following is a typical example:

Explanation:

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