What are composite error and ratio error in a current transformer?

Question

Accepted Answer

Composite error and ratio error are two types of errors in current transformers.

Composite error is the combination of ratio error and phase angle error in a current transformer.
Ratio error is the difference between the actual turns ratio and the specified turns ratio of a current transformer.
Phase angle error is the angular difference between the primary and secondary currents of a current transformer.
Composite error and ratio error affect the accuracy of current measurement in a current transformer.
For example, if a current transformer has a ratio error of 1% and a phase angle error of 2 degrees, the composite error would be the combination of these two errors.

Accepted Answer

Electrial transformer

Accepted Answer

If the factor of security of the CT is 5, it means that thecomposite error of the metering CT at 5 times the rated pri

Accepted Answer

the factor of security of the CT is 5, it means that thecomposite error of the metering CT at 5 times the rated primary current is equal to or greater than 10%. This means that heavy currents on the primary are not passed on to the secondary circuit and instruments are therefore protected

Accepted Answer

The rms value of difference between the ideal secondary current and the actual secondary current.

Accepted Answer

Its composite error means rms value of secondary current of ideal and secondary current of phase and ratio error means phase and effect of harmonic in the excitation current

Accepted Answer

If the factor of security of the CT is 5, it means that thecomposite error of the metering CT at 5 times the rated primary current is equal to or greater than 10%. This means that heavy currents on the primary are not passed on to the secondary circuit and instruments are therefore protected

What are composite error and ratio error in a current transformer?

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