大地网检测综述

A Summary of Geodetic Network Detection

对于接地网的测试往往仅局限于测量接地电阻的大小。接地阻抗低并不意味着接地网安全,要进行全面评估。对于大型地网,“接地电阻”呈现出较明显的“复数阻抗”性质,即包含电阻分量、电抗分量,所以应当采用“接地阻抗”的概念取代“接地电阻”。不能仅以接地电阻作为接地系统的安全判据已成行业共识。

Testing of grounding grids is often limited to measuring the magnitude of grounding resistance. A low ground impedance does not mean that the grounding grid is safe and should be fully evaluated. For large ground networks, the "grounding resistance" exhibits a more obvious "complex impedance" property, which includes the resistance component and the reactive component, so the concept of "grounding impedance" should be used instead of "grounding resistance". It is an industry consensus that the grounding resistance cannot be used only as a safety criterion for grounding systems.