The influence of fish-tail plate material and contact resistance on electrified tracks
What are the limitations of ordinary carbon steel fishplates in electrified circuits?
Ordinary carbon steel has a high resistivity and large contact resistance, which can lead to signal attenuation and traction loss. In the electrified section, it is easy to cause poor splitting of the track circuit, which affects signal display and train dispatching.
What are the material advantages of conductive fishplates?
The conductive fishplate is made of alloy steel or copper alloy composite material, with low resistivity and small contact resistance. It can ensure the efficient transmission of signal current and traction current, reducing energy consumption and fault risks.
What is the influence of the contact surface treatment of the fishplate on the contact resistance?
Grinding, tin plating or silver plating of the contact surface can reduce contact resistance and enhance electrical conductivity stability. The treated contact surfaces fit more closely, reducing the resistance fluctuations and heat generation problems caused by the gap.
What track circuit faults can be caused by excessive contact resistance?
Excessive contact resistance can lead to signal transmission attenuation, resulting in faults such as red light bands and poor splitting. When a train occupies the track, the signal cannot be correctly identified, directly threatening the safety of train operation.
How to choose fishplates suitable for electrified railways?
Give priority to using conductive profile materials, and strictly control the processing accuracy of contact surfaces and anti-corrosion treatment. Ensure that the contact resistance complies with the track circuit standards, taking into account both electrical conductivity and mechanical strength.