Double-protection grounding wire method of direct-current traction power supply double-insulation contact network system

Abstract

The invention discloses a double-protection grounding wire method of a direct-current traction power supply double-insulation contact network system. The method comprises the steps: laying a first protection grounding wire along a line in a through manner, enabling two ends of the first protection grounding wire to be connected to a station ground network, and enabling the first protection grounding wire to be connected with each supporting column respectively as a short-circuit monitoring path when a contact network is disconnected and overlapped with the supporting columns; and laying a second protection grounding wire is along the line in a through manner, enabling the two ends of the second protection grounding wire to be connected to the station ground network, enabling the second protection grounding wire to be connected with an insulation neutral section between the basic insulation and the auxiliary insulation on each supporting column, enabling the second protection groundingwire to be insulated from the supporting column and to serve as a monitoring path for basic insulation flashover or damage. The double-protection ground wire is laid along the line in the through mode, the two ends of the double-protection ground wire are connected to the station ground network, a basic insulation flashover or damage monitoring and a short circuit monitoring path when the contactnetwork is disconnected and overlapped with the supporting columns are provided, and meanwhile an urban landscape coordination requirement is met on the premise that safety and reliability are met.

Description

technical field [0001] The invention belongs to the technical field of urban rail transit, and in particular relates to a double-protection grounding wire method for a double-insulation catenary system for DC traction power supply. Background technique [0002] Based on the needs of urban development and green energy conservation and environmental protection, urban rail transit has developed rapidly. Due to the limitations of roads and surrounding environments, trams that share the right of way operation mode have also been implemented in many cities. Correspondingly, trams at home and abroad generally adopt the double insulation overhead catenary power supply system, and foreign countries generally do not adopt other protection measures except double insulation, and there are domestic design schemes that use double insulation plus overhead ground wires, but according to theoretical analysis and calculation, in When the double insulation is accidentally damaged, it is imposs...

AI Technical Summary

Problems solved by technology

Correspondingly, trams at home and abroad generally adopt the double insulation overhead catenary power supply system, and foreign countries generally do not adopt other protection measures except double insulation, and there are domestic design schemes that use double insulation plus overhead ground wires, but according to theoretical analysis and calculation, in When the double insulation is accidentally damaged, it is impossible to effectively avoid the electric shock injury to the public caused by touching the catenary column and other conductors at this time. Catenary system protective earthing safety

[0003] The foreign catenary double insulation grounding protection scheme is the basic insulation plus auxiliary insulation scheme. Its purpose is that when the basic insulation is damaged, the auxiliary insulation can still isolate the live body and the grounding body such as the column, but it requires frequent inspections by operators to find damaged insulation parts and remove them. Replace it in time. Due to the possibility of lightning strikes, disconnection and other accidents, the double insulation is damaged and the flashover is short-circuited to the ground. Since there is no short-circuit current return path, it is difficult to find and replace it in time, which will result in contact with the pillar at this time. accidental electric shock injuries to the public

[0004] Some tram projects in China have set up a grounding protection scheme of double insulation + overhead ground wire, but it cannot effectively monitor and find the flashover and damage state of the basic insulation. When the flashover or damage of the auxiliary insulation is not detected and replaced in time, It is also not effective to avoid electric shock injury to the public who touches the pillar at this time

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