Reed Switch and Magneto Resistor-Based Differential Protection Featuring Test Diagnostics for Converters

M. Kletsel’, A. Barukin, D. Amirbek
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引用次数: 8

Abstract

This paper states that constructing relay protections without current transformers is a relevant undertaking. To address this, the paper proposes using reed switches. Notably, the principles and some protection devices based on reed switches have already been developed, including differential protection of reed switch and magneto resistor-based converters; these solutions use the majority principle and functional diagnostics blocks. It should be emphasized that such protections lack test diagnostics, which means it cannot timely detect damaged majority elements or output relays, resulting in false positives or failure to trigger protections. This paper proposes a circuit for test diagnostics that, unlike other known designs, has three to six interconnected control windings on magneto resistors as well as button switches. The authors hereof discuss how protections act in a variety of converter operations as well as how to detect faults in three redundant protection kits, the majority element, or the output relay. To mount magneto resistors near the busbars of closed DC conductors, this paper proposes a simple and convenient mount that contains an L-shaped plate and angled fixtures. The paper further defines the applications of such protection.
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基于簧片开关和磁电阻的差动保护,具有转换器的测试诊断功能
本文论述了无电流互感器继电保护的建设是一项相关工作。为了解决这个问题,本文建议使用簧片开关。值得注意的是,基于簧片开关的原理和一些保护装置已经被开发出来,包括簧片开关和基于磁敏电阻的变换器的差动保护;这些解决方案使用多数原则和功能诊断块。需要强调的是,这种保护缺乏测试诊断,这意味着它不能及时检测损坏的多数元件或输出继电器,导致误报或触发保护失败。本文提出了一种测试诊断电路,与其他已知的设计不同,它在磁电阻和按钮开关上有三到六个相互连接的控制绕组。本文的作者讨论了保护如何在各种转换器操作中起作用,以及如何检测三个冗余保护套件,多数元件或输出继电器中的故障。为了将磁电阻安装在闭合直流导体母线附近,本文提出了一种简单方便的安装方法,该方法包含l型板和倾斜夹具。本文进一步界定了这种保护的适用范围。
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