基于数字兆欧表自动切换档位的研究与实现

Research and Implementation of Automatic Switching Gear of the Digital Megger

摘要:

随着电力、电气设备的日益复杂化,对于其安全性能也有了更高的要求,数字兆欧表作为测量绝缘阻值的重要工具,已在工业领域中广泛应用；为了满足测量精度以及兆欧表的可靠性,通过基于S3C2440的嵌入式平台,提出了一种基于数字兆欧表的自动切换档位的实现方案,以达到更加精确的测量；此方案通过判断采集到的电压值选择相应的采样电阻来实现,并结合硬件平台和软件设计,分别介绍了驱动程序和应用程序的编写与测试,并很好地应用到了实际电路中；经测试,能够达到预期的效果,测量精度高,测量误差控制在±2%。

Abstract:

With the growing complexity of electric power and electrical equipment,a higher requirement has been brought up for the safety performance .As an important tool of measuring insulation resistance, Digital megger has been widely used in industrial field.In order to satisfy the measurement precision and the reliability of the megger and achieve a more accurate measurement, a realizable scheme has been put forward based on digital megger switch gear that is based on the S3C2440 embedded platform.This plan will choose a corresponding sampling resistance by judging collected voltage value,and combined with the hardware platform and software design,Introducing the preparation and testing of the drivers and applications respectively.what's more, a good application has been used in practical circuits. After testing, it can achieve the desired results which makes a higher measurement precision and Controls the measurement error about ±2%.