ENSURING SENSITIVITY OF REMOTE PROTECTION OF FEEDERS OF THE CONTACT ALTERNATING CURRENT MAIN ON THE PLOT WITH NOT GROUNDED SUPPORTS
Until recently, to ensure reliable operation of the feeder protection contact AC supports all metal parts, normally energized, had to have a reliable connection with mandatory rail traction. However, the experience of the West – Siberian Railway has shown that, with appropriate training between substation zone and properly configured relay protection can be operated without traction network support earth on track while maintaining the required sensitivity to currents emergency protection regimes. At the same time there are special requirements to resist spreading catenary poles. The paper proposes a formula to determine the required resistance of the junction «group supports – land» based on the sensitivity of the main requirements to provide protection, recommendations for reducing it.