Analysis of 330 kV Transformer Differential Protection Undesirable Tripping Caused by Inrush Current

Zhou LI; Anyang HE; Hui WANG; Chen SHI; Zhen TAN; Kun WANG; Jiawei YUAN; Zaibin JIAO

doi:10.16513/j.2096-2185.DE.2003007

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Distributed Energy ›› 2020, Vol. 5 ›› Issue (2) : 8-14. DOI: 10.16513/j.2096-2185.DE.2003007

Basic Research

Analysis of 330 kV Transformer Differential Protection Undesirable Tripping Caused by Inrush Current

Zhou LI ¹ ,
Anyang HE ² ,
Hui WANG ¹ ,
Chen SHI ¹ ,
Zhen TAN ¹ ,
Kun WANG ¹ ,
Jiawei YUAN ² ,
Zaibin JIAO ²

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Abstract

The access of distributed generation such as wind power and photovoltaic leads to the increasingly complex transient process of system fault and the worse environment of transformer differential protection. This paper analyzes a case of mal-operation of differential current protection when the transformer is no-load energizing in the system with distributed generation. The analysis of recording data shows that there is serious inrush current when the transformer is energizing, and the main protection locked by phase is not locked correctly, resulting in the protection mal-operation. In view of the fact that the differential protection based on the second harmonic restraint cannot act correctly in some cases, this paper studies the differences between the two protection methods and the possible incorrect operation through theoretical analysis and simulation verification from the perspectives of current compensation mode, locking mode and inrush current attenuation, and puts forward appropriate suggestions.

Key words

transformer / differential protection / inrush current / second harmonic / undesirable tripping

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Zhou LI , Anyang HE , Hui WANG , et al . Analysis of 330 kV Transformer Differential Protection Undesirable Tripping Caused by Inrush Current[J]. Distributed Energy Resources. 2020, 5(2): 8-14 https://doi.org/10.16513/j.2096-2185.DE.2003007

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