When a transformer is being energized, a large magnetic inrush current flows depending upon the closing phase angle of the circuit breaker and the residual magnetic flux in the iron core. One of the suppressing methods of the magnetic inrush current is to control the closing phase angle of the circuit breaker. Controlled switching has been used for no‐load transformer energization until now. However, the transformer may be switched under an on‐load state. In this case, a large magnetic inrush current will flow. To suppress the inrush current by using controlled switching, the information of the residual magnetic flux in the iron core is needed. The residual magnetic flux for no‐load transformers has been investigated. However, the residual magnetic flux for on‐load transformers was not investigated. In this paper, the residual magnetic flux for an on‐load transformer was investigated by experiments and calculations. © 2020 Institute of Electrical Engineers of Japan. Published by Wiley Periodicals LLC.

中文翻译：

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用于控制开关的有载变压器的剩磁通量

给变压器通电时，大的励磁涌流根据断路器的闭合相角和铁芯中的剩磁通量而流动。抑制电磁浪涌电流的方法之一是控制断路器的闭合相角。迄今为止，控制开关一直用于空载变压器的通电。但是，可以在有载状态下切换变压器。在这种情况下，会有较大的磁涌电流流过。为了通过控制开关抑制涌入电流，需要铁芯中的剩余磁通量信息。已经研究了空载变压器的剩余磁通量。但是，没有研究有载变压器的剩余磁通量。在本文中，通过实验和计算研究了有载变压器的剩余磁通量。©2020日本电气工程师学会。由Wiley Periodicals LLC发布。