13-06-2010, 04:51 PM
Thank you sir, We generally call RE area(Railway area which is electrified by 25KV Over head equipment (OHE). In this area we use only single rail track circuits because of which one rail is given for return current from the OHE when the train passes. In this RE area track circuit the OHE department should have to provided the bonds (transverse bond, longitudinal bond, Z-bond ) for every track circuit portion. If this bond is missing there may be chance of return high current flowing through our bonds or track relays. Staff should ensure this also. Actually it will be good that i explained about the erection of the signal post and installation of point machine and installation of power supply to the equipment. room. The power supply system generally in our practice is we use a 10KVA step down transformer which taps supply from 25KVA Over head line which gives output of 230v in turn it is tapped to Electrical control panel where we use 230V AC as our input to equipment room either IPS (Integrated power supply system) system or conventional (charger with battery bank) system. During installation of point machine in case of providing fan-shaped layout with sleepers, layout will be assembled by p.way staff outside and a crane will be bought which inserts the assemble layout in the required position. The Station working rules document includes the normal operational procedures signaling system once it is installed, the operational procedures in degraded conditions and information related to the signalling plan, gradient, no.of level crossing gates whether these are interlocked or non interlocked gates. In this RE-area there may be chance of getting the signals infringing with the track not as per the prescribed distance from the centre of track (i.e3.5 mts). While erecting such signals care should be taken that the OHE supply should shut down which not gives the induction effect. One risk is the termination of tail cable with safe climbing of signal post. Actually I did not have that much idea about the documents which shows that the safety is ensured during block period. will you guide me