摘要
根据GB/T 12706-2002和IEC 60502标准设计了电力电缆半导电屏蔽电阻率测试仪。仪器采用导体屏蔽、绝缘屏蔽、加热后导体和绝缘屏蔽等4个体积电阻率测量模块,由C8051高速单片机集中控制;对于单个测量模块,采用了4探针的测试方法;针对高的电压测量范围,设计了多档精密电阻分压网络;面对高电压、低功耗的难题,采用了测量节点电位的方法。仪器同时具有USB接口,可将测量数据送入PC机的数据库中,进行数据分析和管理。该仪器直接显示电缆导体屏蔽与绝缘屏蔽体积电阻率,运行稳定,单组测量模块功率小于0.1W,测量误差为±1%。
A resistivity meter of power cable semiconductor shields is developed according to GB/T 12706-2002 and IEC 60502. It consists of four volume resistance measuring modules for conductor shield,insulator shield,heated conductor shield and heated insulator shield,centrally controlled by high speed MCU C8051. Four-point probe measurement is applied for each module. Node voltage measurement is adopted for high voltage and low power consumption application and multi-step accurate resistor voltage divider is designed for wide voltage measurement range. The meter is equipped with USB interface to send measured data to the database in PC for data analysis and management. It runs stably and displays the resistivities of semiconductor shield and insulated shield directly, with power consumption of single module less than 0.1 W and error within ±1%.
出处
《电力自动化设备》
EI
CSCD
北大核心
2007年第7期90-92,112,共4页
Electric Power Automation Equipment
关键词
电力电缆
导体屏蔽
绝缘屏蔽
电阻率测量
power cable
conductor shield
insulator shield
resistivity measurement