Меры защиты воздушных линий от воздействия контактной сети переменного тока

Abstract

Rail transport together represents energy systems of enormous proportions. An important step in maintaining the correct performance of such a system is the acquisition and preservation of electrical parameters.
 The main operational problems appear at the moment of maintaining these parameters within acceptable limits. One of these are the linear electrical parameters of overhead lines that run along the contact network of the AC railway. The problem is the phase imbalance in both the capacitive and inductive components. The capacitive component is the interaction between the contact network and the longitudinal power supply system. The inductive component, in turn, is the resistance of the system itself
 An unnecessary electric and magnetic field will be induced from the contact network to the overhead line, which is a negative electromagnetic effect. The induced voltage on phases A, B and C will be different, hence the different parameters.
 An important task is not to correct the consequences of influence, but to exclude the appearance of this influence altogether. The authors propose a transposition of overhead line wires with a six-step installation method to align the linear electrical parameters of the line, which is under the influence of the AC contact network. Since modern installation does not allow to achieve the required accuracy, a wire transposition installation device should also be used.
 As a result of the uniform tension of the wires of the three-phase overhead line system, all phase wires will be constantly equidistant from the contact wire and the negative electromagnetic effect will be constantly balanced and tend to zero.