Study On The Earthing System In Overhead Transmission Line

Previously subject to the limitations of science and technology,early power system designworkers more concerned with power plant or substation equipment or man-made causes of single-phase wound short of the roadblock when the voltage step and contact security. High-voltage overhead power lines due to fewer and most of the towers located in the hill lessall expert of the lot, so the main consideration is the safety of lightning protection towers, and the contact voltage step on the safety of the basic issues have not taken into account. But with the rapid development of power guid construction, in line tower of the staff-intensive activities to increase in the number of zones, some of the substation is located near the paddy field in the pole single-phase ground fault occurred-when the crowd around by step voltage injury The events that have taken place. As a result, in line construction and operation and maintenance, the tower grounding devices in addition to consideration of mine, on the part of the special region of the step voltage line tower and access to a number of voltage testing and analysis work on the area to take OVer some of the step-down Measures, it has become extremely urgent importance.Firstly, the thesis analyzes the normal method of power transmission line tower lightning protection and grounding design. To reduce tower grounding resistance is the effective method to increase lightning withstand level. By analyzes the tower grounding resistance of transmission line, from the tower grounding device design, calculation, combining tower construction project, to find a comprehensive approach to reduce the tower grounding resistance.Then the article analyzed the impact of the step voltage and voltage contacts with the size of several major factors, and the fault current tower, tower grounding resistance is the impact of contact and step voltage and voltage comparison to the size of an effective solution to a major factor. Next on the fault current tower,tower grounding resistance to carry out the relevant theoretical research. Put forward for analysis by engineers and technicians of the simple and rapid method for resistance tests grounding line workers with a comprehensive method.