Ground resistance testers include not only clamp-type ground resistance testers, digital ground resistance testers, and other testing instruments, but also ground grid grounding resistance testers. With the increase in the rated voltage level of power systems in current power construction, high-voltage, large-capacity substations are increasing, and many large or ultra-large grounding grids have emerged. At this time, it is necessary to use a ground grid grounding resistance tester to measure various characteristic parameters of the grounding grid and accurately assess its safety status. So how should we evaluate its performance?
In fact, many consumers have this question because they are afraid that the instrument they purchase will have frequent problems, not bringing real practical benefits and wasting a lot of time, leading to unnecessary losses. Most ground grid grounding resistance testers have excellent performance. For example, the GDWR series large ground grid grounding resistance tester can test the power frequency grounding impedance, contact voltage, step voltage, transferred potential, field surface potential gradient, and other power frequency characteristics of various grounding devices, as well as soil resistivity.
This testing instrument uses the heterodyne method for measurement, combined with modern software and hardware filtering technology, giving the instrument high anti-interference performance and stable and reliable test data. A 30V power frequency interference only causes a 0.002Ω error. It can be used to measure large grounding grids with very small grounding impedance. It also performs well in data storage, capable of saving 50 sets of measurement data, and comes with a built-in micro printer to print measurement results on-site. There is no need to worry about the inability to handle multiple measurements at once during the test.
