Approximation of Parameters of Fundamental Component Of Secondary Current Distorted by CT Saturation

Abstract

A new algorithm for estimating parameters of the fundamental component of a secondary current deformed due to CT saturation is presented in the paper. The algorithm is developed in an innovative 3D methodology where the samples of phase currents are considered as components of a 3D vector. The proposed algorithm can properly simultaneously remove the aperiodic components and distortions caused by CT saturation from a secondary current measured at the secondary side of CTs. Some results of simulation research has been provided and discussed.

A Hybrid Intelligent Method for Compensation of Current Transformers Saturation Based on PSO-SVR

“…A method for detection of saturation is suggested in [10] by calculating the mean and the variance of the fault. In [11], a method is presented for detection and compensation of the saturated secondary current by using the derivatives of secondary current and Newton backward differential formula. The proposed method is dependent on an index as the saturation detection criterion.…”

“…This method is simulated by taking into account the residual flux of core, burden of CT as well as the DC component and the noise of the current signal. Regarding the advantages of differential methods such as simplicity of calculations and the possibility of their implementation in on-time applications, these methods have suffered from some difficulties such as very high dependency on sampling frequency, high sensitivity to noise, high dependency of detected output signal to the strength and weakness of the CT's core saturation [11].…”