In the three-pole linear method of measurement, how to arrange the three poles, specifically, auxiliary voltage pole and auxiliary current pole and be measured grounding device (network) distance how to arrange and master, this is one of the key to measure the grounding resistance. General grounding resistance test instruments are provided with two auxiliary grounding poles, and supporting two test wires, a 40m, another 20m.
Some grounding resistance testers have even shorter wires. It is of great concern to every surveyor whether accurate measurement result can be obtained with such matching conductor.
When the grounding resistance tester is testing, if the grounding resistance of the auxiliary current pole itself is too large, the measurement current is very small under a certain measurement voltage, which not only affects the measurement sensitivity, but also the measurement error is large. Sometimes even grounding resistance tester or instrument are not reflected, the result can not be measured. The methods to reduce the grounding resistance of the current pole are as follows: increase the diameter of the grounding pole, increase the length, use multiple current poles in parallel, inject water around the current pole, inject salt water, and reduce its grounding resistance.
If there are trees around the poles, trees can be cleverly used as poles: a system of auxiliary poles is formed by gently peeling the bark of several trees and winding them with bare copper wire, connecting them in parallel, and then connecting them with the poles. On some special occasions, this method is both convenient and useful.
The measurement of grounding resistance of large grounding units (networks) is more difficult, but not impossible to measure. There are many factors that can influence the accurate measurement of grounding resistance tester, such as the scene of the measurement of soil distribution inhomogeneity, underground large size metal, the scene of the electromagnetic environment can cause error to measuring data, such as grounding resistance measurement in general ground net.through required accuracy is not high, so the measurement all can meet your requirements, Other methods can be used for accurate measurement of grounding resistance in ground grids or special environments where higher measurement accuracy is required.
Xinshengneng specializes in the production of grounding/insulation series of test equipment, the production of a variety of products, complete models, cost-effective products. Welcome to inquire: 0312-3188565!
