This single-insulated suspension composite insulator is custom-designed for the 25kV/27.5kV voltage level in the railway context. When the railway power supply system is operational, it efficiently isolates the electrical conductors from the cantilever's support structure, avoiding electrical leakage and protecting the entirety of the contact network. In addition to the basic insulation function, it has to comply with specific technical requisites of the railway. For example, it must tolerate the regular vibrations due to passing trains and maintain stable performance within the complex electromagnetic conditions along the railway line. During the design process, engineers focus on aspects such as material durability and structural stability to ensure it can endure the rigors of railway use. In production, strict quality inspection procedures are followed to guarantee each insulator meets the standards.
There are certain differences between insulators used in electrified railways and those in power grid systems in terms of materials, design, and application. For example, the Suspension Insulators in the electrified railway catenary system are similar to the Deadend Insulators on transmission line towers. However, due to different application scenarios, the degree of mechanical impact they receive also varies. The high-frequency vibrations and strong winds generated when trains pass at high speeds cause the Suspension Insulators in the electrified railway catenary system to bear greater tensile loads.
According to the requirements of the Chinese railway standard TB/T 3199.2-2018, the SML performance index of the 27.5kV Suspension Insulators used in high-speed railways needs to be ≥ 200kN. However, according to the requirements of ANSI C29.13, the SML performance index of 28kV Deadend Insulators only needs to be ≥ 70kN. That is to say, under the same voltage level, compared with the Deadend Insulators used in the power grid, the SML performance index requirement of the Suspension Insulators used in the electrified railway catenary system is 190% higher.
Therefore, the Suspension Insulators used in the electrified railway catenary system have stricter requirements in terms of core rod manufacturing processes, fitting forging processes, crimping times and methods, and factory quality inspection procedures. JD Electric has a mature team for railway product design and manufacturing. JD Electric regularly exchanges with experts from China State Railway Group, China Railway Construction Corporation, China Railway Engineering Corporation, and China Academy of Railway Sciences and accepts their reviews.
The 25kV/27.5kV Single-insulated Suspension Composite Insulator has remarkable characteristics. It provides excellent insulation capabilities, ensuring dependable separation between electrical components even in harsh railway circumstances. With high mechanical robustness, it can firmly support the electrical conductors on the cantilever and resist the external forces generated during train movements without sustaining damage. Moreover, it exhibits good resistance to environmental elements like 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 used on the cantilever of the electrified railway contact network. Its main function is to support the electrical conductors while maintaining electrical insulation, which is essential for the stable power supply and the safe running of trains.
Features:
● High Reliability:
Meeting the exacting demands of the railway industry, it can work stably for a long time, reducing the frequency of maintenance and ensuring the smooth operation of the railway.
● Railway-tailored Design:
Its structure and material choices are optimized according to the specific features of the railway environment, making it more adept at handling the challenges presented by railway operations than ordinary power system insulators.
● Effective Anti-pollution Capacity:
Given the various pollutants along the railway, it has a well-designed anti-pollution mechanism to ensure its insulation performance is not compromised, safeguarding the safety of the railway power supply system.
● Strong Vibration Tolerance:
With outstanding resistance to vibration, it can effectively manage the vibrations caused by passing trains and maintain its position and insulation function on the cantilever.
