【摘要】 介绍了几种常用小地网接地电阻测试仪器的输出特性及其与标准电阻的对比误差 ;比较各测试仪采用不同测量法现场测得的接地电阻值。结果表明 ,地网接地电阻 Rx<1Ω 时 ,一般杆塔接地电阻测试仪的测量误差很大 ;Rx 为 1～ 30 Ω 时 ,其最大误差为 2 1%。更多还原

【Abstract】 Principle and output characteristics of 4 kinds of instruments for measuring small grounding grid are introduced. The accuracy is compared with standard resistor. The result shows that their error is big when the resistance is less than 1 Ω, the maximum error is 21% when the resistance is 1~30 Ω for these instruments.更多还原