Decrease in number of not selective shutdownsof high-speed switchesfeeders of overhead contact system

In article possibilities of decrease in number of not selective shutdowns of high-speed switches by use of the relay - the differential shunt are described at full removal of a package of steel on a branch of smaller section. Results of experimental evaluation of the work of the relay - the differential shunt are given at full removal of a package of steel in a branch of smaller section and its trial operation. Conclusions are drawn on earlier undescribed property of the relay - the differential shunt, at full removal of a package of steel on a branch of smaller section - with increase in speed of increase of current, the considerable time lag of operation of the relay appears.