High voltage isolating switch with delayed disconnecting function

Abstract

The invention discloses a high voltage isolating switch with a delayed disconnecting function. A compressed air end is connected with an air path of the high voltage isolating switch, a pantograph connecting part of the high voltage isolating switch is connected with a pantograph, a main circuit breaker connecting part of the high voltage isolating switch is connected with a main circuit breaker of a locomotive, and a disconnecting part of the high voltage isolating switch is connected with a locomotive body; a switching-off signal output end of a control diagnosis system of the locomotive is connected with a time relay coil in the high voltage isolating switch, and an external power is connected with a switching-off electro-pneumatic valve through a normally-open contact of a time relay ; a connecting point is arranged between the switching-off signal output end of the control diagnosis system of the locomotive and a pantograph-down signal input end. When the control diagnosis system of the locomotive gives out a switching-off signal, the signal is used as a pantograph-down signal to be echoed to the input end of the control diagnosis system of the locomotive. The high voltage isolating switch disclosed by the invention has the advantages that the situation that the locomotive cannot perform disconnecting switching of the high voltage isolating switch under the pantograph-up state is guaranteed through a hardware loop, and the major failure that the electric network is tripped or powered off caused by the operation of the high voltage isolating switch by mistake is avoided.

Description

technical field [0001] The invention relates to a high-voltage isolating switch, in particular to a high-voltage isolating switch with a time-delay disconnection function. Background technique [0002] An electric locomotive is a locomotive that obtains electrical energy from the catenary and is driven by a traction motor. The way of receiving electric energy is 25kV single-phase power frequency alternating current from catenary, through pantograph, high-voltage isolating switch, main circuit breaker and main transformer A-X winding (winding X end is connected to the fixed ground point on the car body), Then it flows into the six moving shafts through six grounding return devices, and finally touches the steel rail through the wheel rail, and returns to the substation from the steel rail, finally realizing the electric locomotive electric energy acquisition. Each electric locomotive is equipped with two front and rear pantographs and two high-voltage isolating switches, and...

AI Technical Summary

Problems solved by technology

When the locomotive is in the state of raising the bow, once the corresponding high-voltage isolating switch opening electro-pneumatic valve is accidentally triggered and energized due to channeling or interference, and the pantograph cannot be lowered in time at this time (the pantograph lowering time is less than 5.5 seconds) , the high-voltage isolating switch will turn from the operating position to the disconnecting position in the bow-raising state, resulting in a short circuit between the catenary and the ground. Affect the normal operation of the railway

The hard wire controlling the high-voltage isolating switch is connected to the output terminal of the control device, and this kind of electricity and interference cannot be avoided from the software

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