简易单片机功率方向元件  

Simple singlechip computer-based power directional element

作　　者：李升源[1] 何鹏举[1] 吴志荣[1] 

机构地区：[1]江西理工大学机电工程学院,江西赣州341000

出　　处：《电力自动化设备》2008年第5期99-102,共4页Electric Power Automation Equipment

摘　　要：提出一种结构简单使用方便的单片机功率方向元件的构成方案。该方案根据同频率正弦量的相位差在-90°～+90°范围内时,一个周期内方向相同的时间大于1/4周期(否则小于1/4周期)的原理,由单片机测出正弦电流和正弦电压一个周期内方向相同的时间,进而判断功率方向。各种功能的方向元件采用基本方向元件加电压形成电路的积木式结构。按该方案构成的方向元件的特点是,生产时无需给不同功能的方向元件提供不同的内角,使用时也无需对其进行内角调整,可用于集成数字电路方向电流保护中,也可用于微机方向电流保护中,在输出端加一个灵敏继电器,还可用于传统的电磁型继电器构成的方向电流保护中。When the phase deviation between two sinusoids of same frequency is within -90°-＋90°, the duration of same direction in a cycle is longer than 1/4 cycle（otherwise smaller than 1/4 cycle）, according to whieh,a simple singlechip computer-based power directional element is designed. The unidirectional duration of the sinusoidal current and voltage in one cycle is measured and the power direction is then detected by the singlechip computer. Different functional directional elements adopt same modularized structure：the basic directional element and the voltage formation circuit. During production it does not need to supply the different interior angle for the different functional directional element,and during operation it does not need to adjust the interior angle. The designed element can be used in digital IC-based or microcomputer-based directional current protection,and it can also be used in electromagnetic relay-based directional current protection with an additional relay at output end.

关 键 词：方向元件 方向继电器 单片机 方向电流保护 

分 类 号：TM588.15[电气工程—电器]