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| | A new type of microprocessor-based directional current relay is put forward. And its basic principle, hardware structure and basic realization method are analyzed respectively. Meanwhile, countermeasures to some problems that could be faced in concrete process of realization are also discussed. Furthermore, the current directional relay can correctly distinguish the direction in which short-circuit fault occurs only by means of measuring the magnitude of current and the phase of voltage. Because it can wo... | | 提出了一种新型微机式方向继电器即电流方向继电器,分析了它的基本工作原理、硬件构成及基本的实现方法,还分析了具体实现过程中可能遇到的问题及其对策。这种方向继电器只需要检测电流值和电压的相位信息就可以实现短路故障方向的正确判别。由于它不需要检测电压信号的值,所以具有结构简单、实现容易、成本较低、动作较快、工作可靠等优点。此外,该型方向继电器的动作范围和灵敏角的设置非常简单、方便、灵活,而且其电压死区问题得到了很好的解决。 | | 文摘来源 | |   |
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