Influence Of Induced Voltage And Current On Operation And Maintenance Of 500kV Double-Circuit Transmission Lines On The Same Tower And Its Prevention And Control Strategy

With the rapid development of national electric power construction,the capacity of transmission grids is constantly increasing.In order to reduce the area occupied by transmission corridors,the use of double-circuit transmission lines on the same tower has become the backbone of our country.The emergence of double circuit lines on the same tower will undoubtedly greatly reduce the investment of lines and increase the transmission capacity.But at the same time,it also brings new problems to the operation and maintenance of power transmission and transformation equipment.Therefore,the research on the induced voltage and current of double circuit on the same tower has become a very important topic in the construction of UHV power grid.Firstly,according to the characteristics of double circuit transmission lines on the same tower,this paper makes a theoretical analysis of the different operating conditions when one circuit is in normal operation and the other circuit is out of power for maintenance.The general formulas of induced voltage and current are derived by using the distributed parameter method,and the formulas are further derived and analyzed for four cases of non grounding,one-sided grounding,two-sided grounding and shunt reactor with line.Secondly,in view of the current situation that the operation and maintenance personnel in the power industry lack systematic understanding of the induced voltage and current of the double circuit line on the same tower,as well as its impact on the equipment operation and maintenance,this paper analyzes the 500 k V same tower based on the actual cases and possible situations in the production and maintenance work from the equipment selection and daily maintenance,switching operation,maintenance work and other core businesses The influence of induced voltage and current on the operation and maintenance of double circuit line is obtained,and the closely related factors of induced voltage and current affecting the operation and maintenance are obtained.Taking a 500 k V Double Circuit Transmission Line on the same tower as an example,the PSCAD / EMTDC simulation software is used to further analyze the factors closely related to the influence of induced voltage and current on operation and maintenance.Finally,the research conclusions are applied to solve a series of operation and maintenance problems such as equipment selection and maintenance,daily operation,operation and working safety in production practice.The corresponding control strategies are analyzed and formulated.The control strategy is helpful to guide the operation and maintenance personnel to carry out equipment maintenance,switching operation and exception handling,to develop good habits of safe operation and maintenance,to ensure thesafety of equipment and personnel,which is of great practical significance to the operation and maintenance of equipment in power enterprises.