On April 29, Beijing railway official micro issued an article saying that some trains on Beijing Shanghai high speed railway were delayed due to foreign matters hanging on the catenary.
Why is high speed railway catenary afraid of strong wind? He Chenglin, deputy chief of catenary technology section of Beijing power supply section, gave an answer.
It turns out that electricity is the only power for high-speed trains.The catenary of high-speed railway is an important part of power source of EMU. During normal operation, the voltage of live equipment of catenary to ground is 27500 v.
In terms of material type,There are two kinds of foreign matters that affect the catenary: one is conductive foreign mattersFor example, tin foil, kite wire with metal wire, if one end contacts the power supply line and the other end is grounded, it will cause the catenary short circuit trip, resulting in the loss of power of EMU
The other is insulation type foreign body, although it is not conductive, once it intrudes into the dynamic envelope of pantograph of high-speed EMU, it can also cause pantograph fault instantlyThus, the EMU can not obtain current from the catenary, resulting in no power for the EMU.
According to reports,At present, the railway departments mainly rely on civil air defense to deal with foreign matters by arranging regular personnel to patrol along the line and board locomotives.
According to the administrative measures for safety protection of high speed railway, no kite, balloon, Kongming lamp and other floating objects are allowed to fly within 500m on both sides of the high speed railway line.
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