变压器地磁感应电流-无功功率动态关系分析

doi:10.19595/j.cnki.1000-6753.tces.200334

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Abstract The static mathematical relationship between the geomagnetically induction current (GIC) and the reactive power of the transformer is derived by using two linear lines to represent the core curve of the transformer. On this basis, considering GIC quasi-DC characteristics and the influence of transformer triangular winding on zero-sequence flux, the quasi-DC zero-sequence equivalent circuit model of transformer core during geomagnetic storm is established, which is used to calculate the actual DC size of the transformer core and reactive power loss. The simulation calculation of a 1 000kV AC transformer and an 800kV converter transformer is carried out with the measured GIC second data processed by interpolation. The results show that when considering GIC quasi-DC characteristics, the presence of the triangular winding will affect the reactive power loss of the transformer and this effect is particularly significant in the zero crossing phase of the waveform corresponding to the change of GIC flow direction, and the converter transformer under the same GIC current is more affected. Through sensitivity analysis, the main parameters which determine the transformer affected by GIC quasi-DC characteristics are found.

Key words： Transformer geomagnetically induction current (GIC) reactive power quasi-DC characteristic delta connection winding

Received: 04 March 2020

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TM41

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	Wang Zezhong
	Huang Tianchao

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Wang Zezhong,Huang Tianchao. Analysis of Geomagnetically Induction Current-Reactive Power Dynamic Relationship of Transformer[J]. Transactions of China Electrotechnical Society, 2021, 36(9): 1948-1955.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.200334 OR https://dgjsxb.ces-transaction.com/EN/Y2021/V36/I9/1948

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