Abstract
In this paper, the transformation characteristics of current sensor under pulsating DC leakage current is investigated. The mathematical model of current sensor is proposed to accurately describe the secondary side current and excitation current. The transformation process of current sensor is illustrated in details and the transformation error is analyzed from multi aspects. A simulation model is built and a sensor prototype is designed to conduct comparative evaluation, and both simulation and experimental results are presented to verify the correctness of theoretical analysis.
Highlights
The toroidal magnetic core current sensor plays an important role in the power system protection equipments
When it is used to detect the pulsating direct leakage current caused by power electronic equipment failure, the DC component in the leakage current cannot be transferred to the secondary side, and it changes the electromagnetic properties of the current sensor
The sensor transformation characteristics vary according to the value of DC component, which will lead to protection performance deterioration or even protection failure of residual current circuit breaker
Summary
The toroidal magnetic core current sensor plays an important role in the power system protection equipments. When it is used to detect the pulsating direct leakage current caused by power electronic equipment failure, the DC component in the leakage current cannot be transferred to the secondary side, and it changes the electromagnetic properties of the current sensor. In order to improve the power system reliability, the effects of pulsating direct leakage current on transformation characteristics of leakage current sensor should be studied. The magnetization process and energy loss of power transformer under DC bias conditions are widely studied. The effect of sensor time constant on the harmonic amplitude of exciting current is analyzed and the relationship between magnetic permeability and DC component in pulsating DC leakage current during excitation process is discussed. A sensor simulation model is established to verify the theoretical analysis and a transformation error compensation algorithm is proposed
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