Sectioning and Paralleling Post (SP)

These posts are situated approximately midway between feeding posts marking the demarcating point of two zones fed from different phases from adjacent substations. At these posts, a neutral section is provided to make it impossible for the pantograph of an electric locomotive of EMU train to bridge the different phases of 25 kV supply while passing from the zone fed from one substation to the next one. Since the neutral section remains ‘dead’ warning boards are provided in advance to warn and remind the Driver of an approaching electric locomotive /EMU to open locomotive circuit breaker (DJ) before approaching ‘neutral section’. to coast through it and then switch ‘on’ on the other side. Special care is taken in fixing the location of 5 neutral sections on level tangent tracks far away from signals level crossing gates etc to ensure that the train coasts through the neutral section at a sufficiently high speed to obviate the possibility of its stopping and getting stuck within the neutral section. A paralleling interrupter is provided at each ‘SP’ to parallel the OHE of the up and down tracks of a double track section ‘bridging interruptors’ are also provided to permit one feeding post to feed beyond the sectioning post upto the next FP if its 25 kV supply is interrupted for some reasons These bridging interruptors are normally kept open and should only be closed after taking special precautions as detailed in these rules.