Modeling High-voltage Transmission Line Operation under Double Earth Faults for Calculating Voltage Induced on Pipeline

Abstract

Operation of 6-10-35 kV power transmission lines (PTL) under a double earth fault is characterized by significant currents flowing in the ground, which increases the magnetic effect and can result in dangerous voltages on extended metal structures, for example, pipelines passing near these transmission lines. The paper presents the results of studies conducted to develop a method for computer modeling of induced voltages on an above-ground pipeline due to the electromagnetic effect of power lines during double earth faults. This problem was solved using algorithms relying on phase coordinates and implemented in the Fazonord software. Obtained results suggest that under double earth faults, the pipeline parts can be exposed to significant induced voltages, which are close to values that are limiting for emergency conditions. The proposed method and the developed computer models can be used in practice to ensure the electrical safety of personnel working on pipelines located near 6-10-35 kV high-voltage transmission lines.