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Vol. 177, Issue 8, August 2014, pp. 272-278

 

Bullet

 

Research on Transformer Direct Magnetic Bias Current Calculation Method
Based on Field Circuit Iterative Algorithm
 

Ning Yao

College of Electrical and Information Engineering, Xuchang University, Xuchang, 461000, China
Tel.: 15137486661

E-mail: yaonln@163.com

 

Received: 31 July 2014 /Accepted: 29 August 2014 /Published: 31 August 2014

Digital Sensors and Sensor Sysstems

 

Abstract: In order to analyze the DC magnetic bias effect of neutral grounding AC transformer around convertor station grounding electrode, it proposes a new calculation method —field circuit iterative algorithm in this article. The method includes partial iterative algorithm and concentrated iterative algorithm. On the research base of direct injection current calculation methods, field circuit coupling method and resistor network method. Not only the effect of direct convertor station grounding electrode current on substation grounding grid potential, but also the effect of the current of each substation grounding grid on the grounding grid potential of other substation is considered in the field circuit iterative algorithm. Through the analyzing comparison of calculation model, it is proved that field circuit iterative algorithm is more accuracy and adaptative than field-circuit coupling method and resistor network method in the AC power system set by using the equivalent resistance circuit DC path to calculate DC current component of the transformer.

 

Keywords: Transformer, Neutral current, Direct magnetic bias current, Field circuit iterative algorithm, Design improvement.

 

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