CTA-1000C CT PT Analyzer Principle of Low-frequency Test

The CT PT analyzer complies with IEC and IEEE standards. IEC60044-6 standard (corresponding to the national standard GB16847-1977) claims,CT test can be done in conditions lower in frequency than the rated, and avoid secondary windings the risk of failing to allow the terminal voltage. The only requirement is that the core has the same size on the magnetic flux.

IEC60044-6 standard formula for calculating the magnetic flux given by:

As can be seen, the largest settlement in the same chain of magnetic flux Ψm，the core is proportional to voltage and frequency. Therefore, as long as the core has the same size on the magnetic flux, then the test CT can be lower than the rated frequency of the conduct, when the core voltage amplitude required to reduce the requirements, test requirements of the secondary winding of the client voltage also be reduced accordingly. On the frequency of low-frequency test results can be rated after the conversion frequency of CT test results.