Universal Switch for Measuring the Resistance of the Grounding Device Supports of the 110 kV Overhead Power Line

Abstract

At present the devices that use the pulse method to measure the resistance of a grounding device (GD) of the 110 kV overhead power line (OHL) supports have the following disadvantage: to do the measurements, various circuits must be assembled. This takes about 30% of the total measurement time. Moreover, there is no mathematical model to describe the process of measuring the resistance of the protective device for the 110 kV OHL supports. This is a gap in the studies aimed at increasing the efficiency of measuring the resistance of that protective device. We have developed a universal switch to reduce the time for measuring the resistance of the GD of the 110 kV OHL supports using the pulse method. The simplicity of the design of this universal switch means it can be assembled in the structural units of measurement companies. In addition, the developed universal switch can work with different measuring devices. The tests of the developed universal switch show its efficiency, and they indicate the prospects for developing it. The efficiency of the developed universal switch was determined using the developed mathematical model. When employees use the developed universal switch to measure the resistance of the PD of the 110 kV OHL supports by the pulse method, and if it is impossible or inexpedient to disconnect the lightning protection cable from the body of the support, it will take about 86 minutes to perform these measurements. This is 28% less time than if the measurements were performed without using this device.

Keywords

• equipment list
• grounding device
• resistance measurement
• universal switch