Calculation Method Research On The Induced Voltage Of Overhead Transmission Line

With the development of economy,the demand of electric power for whole society is growing.In this background,in order to reduce transmission line corridors,reducing land use but also save power-generation infrastructure spending,high voltage overhead power transmission lines are made of double-circuit transmission and muti-circuit power transfer for energy transmission.Multi-circuits transmission lines technology improved the electric power transmission capacity,but while also brings has some problem,as: due to power transmission line of high voltage grade(220k V,500 k V,800 k V,etal),there are a big induced voltage and current each other in the near lines,especially in which one circuit or several circuit need to de-energized for maintanance,it will bring a great of security hidden on mantenance staff due to the big induced voltage and induced current.So it was necerssary to research the calculation method for induced voltage and current.And explore the method to reduce the voltage and current is useful to ensure the personnel safety.According to the work features of the overhead transmission line,the produced principle of induction voltage in the de-energized line was analyzed in this paper.At the first,the calculation principle of induced voltage and induced current was explaned when one line was energized and another was de-energized in the double circuit transmission line.Then EMTP simulation program was us ed to establish the same tower double circuit overhead transmission line model.And it was used to study the induced voltage and induced current in the de-energized transmission line,and used to study the key factors affecting the induction voltage in dou ble circuit overhead transmission line,such as: line length,line load,line transposition,shunt reactor,soil resistivity.Finally,according to the different factors and the impact of the induction voltage calculation,the establishment of a simple lin e induction voltage calculation method.In this paper,a large number of simulation results is useful for the design of the circuit,and the selection of related grounding switch,security personnel has a certain guiding significance.