The Number of Power Line Spans Accounting in Determining the Induced Voltage

The article considers inductive interference components. A description of the induced voltage electromagnetic component is described in detail. The technique of the calculated wire suspension height determining based on the actual magnetic field distribution is presented. The technique for the number of power line spans determining is provided. Dependences of the magnetic field induction vector on the distance along one power line’s span are obtained. Relationships of the magnetic field induction determining error depending on the number of adjacent spans are obtained. Recommendations for the number of spans determining, which must be taken into account when evaluating the magnetic component of the power line electromagnetic field are given

Inductive influence of 25 kV, 50 Hz electrified single rail traction system

The paper presents the methodology for calculation and measurement of induced voltage caused by railway system operation on the sensitive metallic structures. The arrangement and characteristics of railway system 25 kV, 50 Hz are provided. The procedures of short-circuit current calculation and supply current measurement in the railway system are described. The basic theoretic background of inductive interference is explained. The reduction factors of the communication cable, railway system and environment are mentioned and clarified. On a case study, the results of the induced voltage calculation and measurement is compared. It is proved that induced voltage directly depends of supply current or shortcircuit value.