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Keywords

distribution transformer area; three-phase unbalance; zero-sequence current; utility theory; risk assessment

Abstract

With the significant growth of seasonal loads such as agriculture and tourism, power equipment failures and power outages caused by the three-phase unbalance problem in distribution transformer areas become major challenges in the operation and maintenance of distribution networks. Therefore, it is urgent to strengthen the assessment of three-phase unbalance in distribution transformer areas. To address the problems of few evaluation indices and single weight distribution methods for three-phase unbalance in existing distribution transformer areas, a risk assessment method for three-phase unbalance in distribution transformer areas considering zero-sequence current is proposed based on the traditional three-phase unbalance evaluation method for distribution networks. First, the correlation of the severity of three-phase current unbalance with both the zero-sequence current and the three-phase current unbalance degree of the distribution network is fully considered. Then, an evaluation model for three-phase unbalance in distribution transformer areas considering zero-sequence current is established by using the improved utility theory (IUT). Based on the analytic hierarchy process and the anti-entropy weight method, a combined weighting method is proposed to strengthen the comprehensive analysis of three-phase unbalance and zero-sequence current indices. Finally, an example is used to verify the method. The research shows that traditional single evaluation indices cannot effectively and comprehensively evaluate the three-phase unbalance degree in distribution transformer areas, while the proposed risk assessment method can better reflect the severity of three-phase unbalance in each distribution transformer area, achieving more accurate risk assessment.

DOI

10.19781/j.issn.1673-9140.2026.02.009

First Page

97

Last Page

106

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