Operating zone and stability analysis in current transformers based on measurement

Measuring operations on electrical energy, as it's contribution to the learning for values of energy, current and voltage; they are great important for informations of protection and billing. In the energy measurement, the most important factor is current. False measurements on direction of negative or positive for the current, about intended applications as may be cause to entering the early or late activation, it can also cause incorrect billing. Also, in primary systems that measurements are executed directly, these factors are related to measurement sensitivity and accuracy the of measurement tools. In measurement methods, which are performed as secondary, characteristics of the current measurement transformers have also great importance. In this study, the characteristics of different current measurement transformers are investigated, the fault analysis is realized for the up and down values from the normal current values. Moreover, it is evaluated some issues in application, which is caused by some kind of errors.