Continuity and Insulation Testing for the Electrification of the EG3 Line

Project Description

The Paris–Troyes railway line is part of a key interregional and national transport corridor connecting Paris with the southeast of the Île-de-France region, southern Champagne-Ardenne, Franche-Comté, and southern Alsace.
The electrification of this line aims to improve the reliability of daily travel between Aube, Seine-et-Marne, and Paris. The first phase, from Gretz-Armainvilliers to Nogent-sur-Seine, has just been completed. Works on the second phase, from Nogent-sur-Seine to Troyes, are scheduled to begin at the end of 2024.

Our Services

TRACTEDIS carried out nighttime continuity and insulation tests. These tests verify the continuity of the catenary, feeder, and line interruption devices. The insulation of both the catenary and the feeder is also tested — helping to detect defective insulators or the need for tree trimming near the infrastructure.

A comprehensive procedure is prepared in advance to ensure no steps are missed, as any oversight could risk a short circuit when the system is energized.

The tests are performed using a megohmmeter, which injects a voltage of up to 5000V to measure the line’s resistance.

Due to the height of the feeder and the catenary, teams use insulated poles to connect the megohmmeter terminals.