A Calculation Method Based on Analytical Formulas for Inrush Currents and Voltage Dips During Energization

IF 0.4 4区工程技术 Q4 ENGINEERING, ELECTRICAL & ELECTRONIC

Electrical Engineering in Japan Pub Date : 2025-01-14 DOI:10.1002/eej.23499

Rikido Yonezawa, Shoji Kawasaki

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引用次数: 0

Abstract

If a voltage dip gets lower than a certain threshold at the moment when a transformer is energized, its mitigation is required. For this reason, when a transformer is energized, the voltage dip is calculated in advance and the need for its mitigation is considered. From the viewpoint of preventing unnecessary countermeasures, highly accurate calculations are required. However, electromagnetic transient analysis, which is known as a method with high accuracy, is not practical because its operation is rather complicated. In this paper, the analytical circuit is simplified by simulating the magnetizing inductance of the transformer with the inductance and the series connection of the ideal switch, and analytical formulas for the flux and current in the winding are derived for each switching mode. The calculated inrush currents and voltage dips during transformer energization using the derived analytical formulas agreed well with the results from electromagnetic transient analysis, which handled the nonlinear current-flux characteristics precisely.

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基于解析公式的励磁涌流和电压降计算方法

如果在变压器通电时电压下降低于某一阈值，则需要对其进行缓解。因此，当变压器通电时，应提前计算电压降并考虑其缓解需求。从防止不必要的对策的角度来看，需要高度精确的计算。然而，被称为高精度的电磁瞬变分析方法，由于其操作相当复杂，并不实用。本文通过用电感和理想开关串联的方式模拟变压器的磁化电感，对分析电路进行了简化，推导出了每种开关方式下绕组内的磁通和电流的解析公式。用导出的解析公式计算的变压器通电时的涌流和电压降与电磁暂态分析结果吻合较好，较好地处理了非线性电流-磁通特性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Electrical Engineering in Japan 工程技术-工程：电子与电气

CiteScore

0.80

自引率

0.00%

发文量

审稿时长

4-8 weeks

期刊介绍： Electrical Engineering in Japan (EEJ) is an official journal of the Institute of Electrical Engineers of Japan (IEEJ). This authoritative journal is a translation of the Transactions of the Institute of Electrical Engineers of Japan. It publishes 16 issues a year on original research findings in Electrical Engineering with special focus on the science, technology and applications of electric power, such as power generation, transmission and conversion, electric railways (including magnetic levitation devices), motors, switching, power economics.