Coordination of surge suppressors in low-voltage AC power circuits

IEEE 1991 International Symposium on Electromagnetic Compatibility Pub Date : 1991-08-12 DOI:10.1109/ISEMC.1991.148277

M. Stringfellow, B.T. Stonely

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引用次数: 11

Abstract

A theoretical and experimental study on the coordination of surge suppressors on an indoor low-voltage power system is reported. The system studied was a 120-V three-wire power line, equipped with phase, neutral, and ground conductors. Metal-oxide varistor surge suppressors were applied at three points on the system. These were at the service entrance, at a distribution panel, and at the load. Total line length studied was 30 m (100 ft), with the distribution panel and its suppressors being located at the central point. When unidirectional surges typical of lightning were applied at the service entrance, both experimental and theoretical studies showed similar results: removal of a suppressor at either load or distribution panel resulted in unacceptably large oscillatory voltages. Best load protection was achieved with suppressors in all three locations. Distribution of surge current between the three suppressors was shown to be good for both low and high surge currents. Coordination of protective levels was shown to be achieved, even with the very long surge waves typical of lightning.<>

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低压交流电源电路中浪涌抑制器的协调

本文对室内低压电力系统中浪涌抑制器的协调进行了理论和实验研究。所研究的系统是一条120 v的三线电力线路，配有相、中性和接地导体。在系统的三个点上应用了金属氧化物压敏电阻浪涌抑制器。它们分别位于服务入口、配电板和负载处。研究的总管线长度为30米(100英尺)，配电板及其抑制器位于中心点。当在服务入口施加典型的闪电单向浪涌时，实验和理论研究都显示了类似的结果:在负载或配电板上去除抑制器会导致不可接受的大振荡电压。在所有三个位置的抑制器都实现了最佳负载保护。三个抑制器之间的浪涌电流分布对低浪涌电流和高浪涌电流都很好。结果表明，即使在典型的闪电很长的浪涌波下，防护水平的协调也能实现。

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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IEEE 1991 International Symposium on Electromagnetic Compatibility

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