25 KV ALTERNATING CURRENT SUPPLY SYSTEM FOR ELECTRIFIED RAILROADS Russian patent published in 2015 - IPC B60M3/02 H02J3/00 

FIELD: electricity.

SUBSTANCE: system contains the directional power relays located on traction substations and by their outputs connected to switch control units, and by inputs - with the evaluators of current of power branches of traction substations and voltage transformers of distributing devices 27.5 kV. Each voltage transformer of the contact network feeders of the traction substation is connected by one terminal of primary winding to the contact network feeder of the traction substation, and the secondary winding terminals - to the voltage comparator, these voltage transformers are connected only to one of feeders of the contact network of each power branch of traction substations, the adjacent switch control units of each intersubstation zones are connected to each other by means of communication channels of switch control units, voltage comparators are connected to switch control units, the switch control units are connected by means of communication channels with the control units switches which are also connected through communication channels with the switches of additional parallel connection points, current evaluators of the power branch of the traction substations are connected by the inputs to the current transformers of the contact network feeders of the traction substations, the additional parallel connection points with switches are connected to contact suspension brackets of the neighboring tracks near places of connection of feeders of distributing devices 27.5 kV to contact suspension brackets of the contact network.

EFFECT: improved quality of electric power in the power supply system.

2 dwg