Simulation of transients in a traction network during passage of a sectional insulator

Abstract

Overhead contact network failures due to damaged sectional insulators are unacceptable, yet remain a pressing issue. Insulator damage is divided into mechanical and electrical. Mechanical failures occur when the rolling stock pantograph strikes the sectional insulator, while electrical failures result from switching events occurring in the overhead contact system when the rolling stock passes under the sectional insulator. In this article, the authors examine transient processes occurring in a DC traction network when the rolling stock pantograph passes under the sectional insulator. An equivalent circuit diagram for the power supply circuit of a section of the traction network and equations describing the phase of an electric locomotive's passage through the sectional insulator have been complied. A mathematical model is constructed that takes into account the rolling stock current load, its speed, and traction characteristics. The mathematical model consists of two parts. The first considers the electric locomotive as a current source, while the second model describes the electromechanical circuit of the electric rolling stock and its motion. The arc energy generated on the section insulator is calculated, and its dependence on the rolling stock speed and the current consumption is determined. A method is proposed to reduce the negative impact of transient processes on overhead contact network components, thereby increasing the system's reliability and safety. The research results will be useful in developing automated control systems for electric rolling stock movements between overhead contact system sections.