Main Power Supply Point (GPZ), Traction Substation (PT), Central Control Room (NC)

The publication provides an assessment and analysis of technical solutions for the cooperation of a traction substation with the power system. It presents new issues related to powering a traction substation from a 110 kV line, and the role of remote control for facilities such as traction substations and GPZ stations.Progress in the field of technical solutions for the cooperation of a traction substation with the power system is very rapid; the application of innovative microprocessor technology in special designs has increased the reliability of the power system. Nowadays, there is a trend towards transitioning to remote control of Traction Substations (PT) from a Central Control Room (NC). Economic aspects of remote control include the elimination of duty shifts at Traction Substations within “PKP Energetyka”.
The application of the latest solutions at Traction Substations powered directly from 110 kV lines has contributed to reducing transmission losses between the Main Power Supply Point (GPZ) and the PT. Traction substations powered by 110 kV voltage are most often built in the place of former Sectioning Cabins (KS), which served to cooperate with the PT.
A sectioning cabin is designed for sectioning and reducing voltage drops in the 3 kV traction network.
In the PKP power system, the following have been introduced:
– remote control of the MV Traction Substation from the Central Control Room, – remote control of sectioning disconnectors from the NC, – proprietary 110 kV substations controlled from the NC, – proprietary MV transmission lines for non-traction needs (LPN), – remote meter reading system on traction substation supply lines, – central electricity trading system, – dedicated data transmission system via fiber-optic network for control from the central control room based on a LAN network.
A passing electric locomotive draws electrical energy from the nearest Traction Substations via a 3 kV DC network. Traction substations are powered from the GPZ, which draws energy from the power system. (…)

Main Power Supply Point GPZ, Traction Substation PT, Central Control Room NC – PDF file for download