This 25kV/27.5kV Cross-arm Insulator is custom-designed for the 25kV/27.5kV voltage grade in the railway domain. When the railway power supply system is operational, it effectively isolates the electrical conductors from the cross-arm support structure, preventing electrical leakage and protecting the safety of the entire contact network. In addition to the basic insulation function, it must satisfy specific technical requirements of the railway. For example, it has to withstand the continuous vibrations from passing trains and maintain stable performance under the complex electromagnetic environment along the railway line.
As the load capacities of freight trains and the operating speeds of passenger trains keep increasing, the standards for railway facilities have become more and more stringent. According to standards such as ANSI, IEC and GB/T, the range of bending strength for 25kV-35kV Insulated Cross-arms used in power grids and power stations is generally from 5kN to 8kN. However, the bending strength of Insulated Cross-arms for Railways is generally between 12kN and 20kN. For Insulated Cross-arms of the same voltage level, the core mechanical performance parameters of the products designed for railways are twice those of the products designed for power grids and power stations. This puts forward more stringent requirements for manufacturers' abilities in core rods design and manufacturing.
The 25kV/27.5kV Cross-arm Insulator for Railways has remarkable characteristics. It offers excellent insulation performance, ensuring dependable separation between different electrical components even in the harsh railway environment. With robust mechanical strength, it can sturdily support the electrical conductors on the cross-arms without being influenced by the external forces during train operations. Moreover, it has good resistance to environmental factors such as dust, wind, and temperature fluctuations that are common along the railway.
Standards:
IEC 62621-2011; TB/T 3199.2-2018; Q/CR 549-2016
Specifications:
Application:
It is mainly applied to the cross-arms of the electrified railway contact network. Its main function is to support the electrical conductors and maintain electrical insulation, which is vital for the stable power supply and the safe running of trains.
Features:
● High Reliability:
Meeting the strict demands of the railway industry, it can work stably over a long period, reducing the need for maintenance and ensuring the smooth progress of the railway operations.
● Railway-tailored Design:
Its structure and material selection are optimized according to the characteristics of the railway environment, making it more suitable for dealing with the challenges of railway operations than general power system insulators.
● Efficient Anti-pollution Capacity:
Considering the various pollutants along the railway, it has an effective anti-pollution design to ensure its insulation performance remains stable, thus safeguarding the safety of the railway power supply system.
● Superior Vibration Resistance:
With outstanding resistance to vibration, it can effectively handle the vibrations caused by passing trains and maintain its position and insulation function on the cross-arms.
