Question

Turns compensation is used to obtain ________

(a) to compensate the turns

(b) to equalise the turns on the windings

(c) to protect the equipment

(d) transformation ratio equal to nominal ratio

The question was asked in examination.

The query is from Design Features of Current Transformers topic in section Extension of Instrument Ranges of Electrical Measurements

Answer 1

Right choice is (d) transformation ratio equal to nominal ratio

The best explanation: In a C.T., the transformation ratio is given by

R = n + ^Ie⁄Is

where, n is the turns ratio

            Ie is the core loss component of the excitation current

       Is is the secondary winding current

Turns compensation is used to obtain the transformation ratio (R) equal to the nominal ratio (Kn).