【正文】 d ponents, terminating, supporting, registering or insulating the conductor equipment and switching, detecting or protecting equipment. overhead contact line [IEC 60050811, definition 8113302] contact line placed above (or beside) the upper limit of the vehicle gauge and supplying vehicles with electric energy through roofmounted current collection equipment contact line [IEC 60050811, definition 8113301] conductor system for supplying electric energy to vehicles through currentcollecting equipment overhead line [IEC 60050466, definition 4660101] an electric line whose conductors are supported above ground, generally by means of insulators and appropriate supports. NOTE Certain overhead lines may also be constructed with insulated conductors 7 EN 50119:2020 overhead contact line with catenary suspension [IEC 60050811, definition 8113305] overhead contact line where the grooved contact wire or wires are suspended from one or more longitudinal catenaries NOTE Longitudinal suspension is an equivalent term to catenary suspension. load gauge, static maximum crosssectional profile of the vehicles using the railway line kinematic load gauge static load gauge enlarged to allow for dynamic movements of the vehicle, . suspension travel and bounce kinematic envelope kinematic load gauge further enlarged to allow for possible tolerances in the position of the track swept envelope kinematic envelope enlarged to allow for centre and end throw of the vehicles on horizontal and vertical curves neutral section [IEC 60050811, definition 8113616] section of a contact line provided with a sectioning point at each end, to prevent successive electrical sections, differing in voltage or phase, being connected together by the passage of current collectors insulated overlap [IEC 60050811, definition 8113614] sectioning point formed by overlapping the ends of adjacent sections of contact lines, allowing parallel running, insulation being provided by a suitable air gap between the two sets of equipment Conductors contact wire [IEC 60050811, definition 81133 15] electric conductor of an overhead contact line with which the current collectors make contact catenary [IEC 60050811, definition 8113306] longitudinal wire supporting the grooved contact wire or wires either directly or indirectly main catenary [IEC 60050811, definition 8113307] catenary supporting an auxiliary catenary by means of droppers EN 50119:2020 8 auxiliary catenary [IEC 60050811, definition 8113308] catenary suspended from the main catenary and supporting the grooved contact wire or wires directly by means of droppers stitch catenary suspension catenary suspension in which the contact wire is suspended by one or more droppers from a short continuos auxiliary wire, attached to the main catenary at one point on each side of the main catenary support feeder electrical connection between the contact line and the substation or switching station line feeder overhead conductor mounted on the same structure as the overhead contact line to supply successive feeding points reinforcing feeder overhead conductor mounted adjacent to the overhead contact line, and directly connected to it at frequent intervals, in order to increase the effective crosssectional area return circuit all conductors which form the intended path for the traction return current NOTE The conductors may be . running rails, return conductor rails, return conductor earth wires, return cables. return conductor [IEC 60050811, definition 8113410] any part of the return circuit return conductor rail conductor rail used instead of the running rails for the traction return currents return cable insulated return conductor forming part of the return circuit and connecting the rest of the return circuit of the substation conductor [IEC 60050466, definition 4660115] a metal wire or cable, either solid or stranded, designed to carry electrical energy and forming part of the overhead contact line system earth wire [IEC 60050811, definition 8113512] wire connecting supports collectively to earth or the running rails to protect people and installations in case of insulation fault and which may also be used as a return conductor 9 EN 50119:2020 Electrical nominal voltage voltage by which an installation or part of an installation is designated NOTE The voltage of the contact line may differ from the nominal voltage by a quantity within permitted tolerances given in EN 50163. feeding section electrical section of the route fed by individual track feeder circuit breakers within the area supplied by the substation earth [IEC 60050826, definition 8260401] conductive mass of the earth, whose electric potential at any point is conventionally taken as equal to zero fault current maximum current passed through the overhead contact line under fault conditions, within a short defined time period, between live equipment and earth short circuit accidental or intentional conductive path between two or more points in a circuit forcing the voltages between these points to be relatively low. Any such conductive path whether between conductors or between conductor and earth is regarded as a short circuit short circuit current electric current flowing through the shortcircuit continuous current rating nominal rating capacity of the overhead contact line within the system operating parameters stray current current which follows paths other than