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Methods for differential protection of Scott transformers

机译：斯科特变压器的差动保护方法

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This article describes different methods for the differential protection of Scott transformers, which are based on: (a) single-phase relays, (b) 3-phase relays for two-winding transformers, (c) 3-phase relays for multi-winding transformers, (d) specific relays for Scott transformers. Initially, a description about the currents in Scott transformers is shown, which is necessary to understand their differential protection. Afterwards, the different methods for the differential protection of Scott transformers are described. Some methods, based on single-phase relays and based on 3-phase relays for multi-winding transformers, are briefly described in literature, and the contribution of this article is to highlight important details about the matching of the currents in the differential protection. Other methods, based on 3-phase relays for two-winding transformers, are not described in the literature and they are shown here. Finally, two options for the design of specific relays for Scott transformers are proposed in this article. Thus, the result is a clear explanation about the options for the proper differential protection of Scott transformers. (C) 2017 Elsevier B.V. All rights reserved.
机译：本文介绍了不同的Scott变压器差动保护方法，这些方法基于：（a）单相继电器，（b）两绕组变压器的三相继电器，（c）多绕组变压器的三相继电器（d）斯科特变压器专用继电器。最初，显示了有关Scott变压器中电流的描述，这对于理解其差动保护是必要的。然后，描述了用于斯科特变压器的差动保护的不同方法。在文献中简要介绍了一些基于单相继电器和基于三相继电器的多绕组变压器的方法，本文的目的是强调差动保护中电流匹配的重要细节。在文献中没有描述基于用于两绕组变压器的三相继电器的其他方法，在此示出。最后，本文提出了两种设计Scott变压器专用继电器的方法。因此，结果清楚地说明了对Scott变压器进行适当差动保护的选项。 （C）2017 Elsevier B.V.保留所有权利。

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