Transformer Excitation Inrush Current Suppression Method Based on Dynamically Adjustable Resistors

doi:10.11930/j.issn.1004-9649.202503084

Abstract

Abstract:

When the transformer is closed under light load or no load, the magnetizing inrush current caused by the saturation of the core magnetic flux can easily differential protection maloperation, transient voltage dip and other issues, which seriously threatens the safe operation of the power system. The generation mechanism of transformer magnetizing inrush current is analyzed and a transformer magnetizing inrush current suppression method based on dynamic adjustable resistance is proposed. By controlling the size of the adjustable resistance connected to the voltage division circuit, the on the primary side of the transformer is smoothly increased, avoiding the magnetizing inrush current caused by the rapid rise of voltage and the saturation of the core magnetic flux. This alleviates the problem of large magnetizing inrush current generated when the transformer is closed under light load or no load.

Key words: magnetizing inrush current, dynamic adjustable resistors, transformers

SONG Yujie, LI Zhenxing. Transformer Excitation Inrush Current Suppression Method Based on Dynamically Adjustable Resistors[J]. Electric Power, 2025, 58(12): 147-154.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202503084

https://www.electricpower.com.cn/EN/Y2025/V58/I12/147

Figures/Tables 8

Fig.1 Transformer no-load closing equivalent circuit

Fig.2 Single-phase dynamic adjustable resistor model structure

Fig.3 Relationship between trigger angle and time

Fig.4 Differential protection principle

Fig.5 Peak value trend of inrush current under different closing angles

Table 1 Transformer excitation inrush currents for different link group numbers

变压器联结组号	励磁涌流峰值/kA	涌流抑制率/%
Yyn	0.061	97.1
Ynd11	0.076	96.3
Yd11	0.041	98.0

Fig.6 Peak trend of inrush current under different remanence

Fig.7 Peak value trend of inrush current under different connection modes of transformer

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