A double-protection grounding wire method for DC traction power supply double-insulated catenary system

Abstract

The invention discloses a double-protection grounding wire method for a double-insulation catenary system for DC traction power supply, which includes a first protection grounding wire, laid through the line, connected to the station ground grid at both ends, and connected to each pillar respectively, as a catenary The short-circuit monitoring path when the broken wire overlaps the pillar; and the second protective grounding wire, which is laid through the line, connected to the ground network of the station at both ends, and connected to the insulating neutral section between the basic insulation and the auxiliary insulation on each pillar respectively The connection, insulated from the post, serves as a monitoring path for a flashover or failure of the basic insulation. The double protection grounding wire provided by the invention is laid through the line, and both ends are connected to the ground network of the station, which provides the monitoring of basic insulation flashover or damage and the short circuit monitoring path when the catenary breaks and overlaps the pillars, and at the same time meets the safety requirements. Under the premise of reliability, taking into account the coordination needs of urban landscape.

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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