Electric yoke plates are mainly used in overhead transmission lines and are suitable for different operating conditions, such as: 110kV–220kV: triangular yoke plates can be selected for single-string suspension with double-split yokes, while Z-type yoke plates are used for right-angle turns; 330kV–500kV: rectangular and LF types are used for double-string tension split yokes, while LL types are used for four-split single-string suspension; 750kV–1000kV: mainly adapted to long-span tension sections to compensate for tension and wind deflection.
Electric yoke plates are mostly made of steel, making them prone to rust. Surface treatment is a crucial factor in determining their lifespan and must be compatible with the base material and meet international standards for export. Hot-dip galvanizing is a very economical and practical treatment method. The pickled yoke plate is immersed in molten zinc, forming a uniform zinc layer on the surface. This zinc layer provides sacrificial anode protection, preventing rust even if the surface is scratched. Salt spray tests show no red rust after over 96 hours, and outdoor use can last 20-30 years. It is compatible with materials such as Q235, Q345, and ductile iron.
When using Electric Yoke Plate in corrosive environments, we need to consider the corrosion level of the environment and the corrosion resistance level of the material, select the appropriate substrate and surface treatment solution, and at the same time, take appropriate maintenance measures.
For mild corrosion scenarios, such as plains, mountainous areas, and environments without industrial pollution, there is no deep corrosion, and the impact on mechanical strength is minimal.
Moderate corrosion: In areas near chemical plants with high humidity (e.g., 60%-80%), even with a zinc layer on the surface, the zinc layer will be rapidly consumed, and pitting corrosion will occur in the substrate. Mechanical strength will generally be affected after 5-10 years of use.
Severe corrosion: In coastal salt spray areas, offshore platforms, salt fields, chemical industrial parks, and areas prone to acid rain, the corrosion rate is extremely high. The medium will quickly penetrate the protective layer, and the substrate corrosion rate is also fast. There is a risk of breakage after 3-5 years of use.
The choice of substrate directly affects the service life of an electric yoke plate. In addition, it is also related to many other factors. In order to meet the needs of foreign trade scenarios, we will add some precautions below.
Structural factors
For yokes with complex structures, such as multiple mounting holes or irregular corners, water accumulation dead zones may form, where salt spray, rainwater, and industrial dust can accumulate, leading to localized corrosion, damage to the protective layer, and pitting corrosion of the substrate. Therefore, when used in corrosive environments, we should prioritize yokes with simple structures, smooth surfaces, and drainage slopes.
Stress distribution
If the plate is too thin, the corner radius is too small, or the cross section is uneven, it will lead to stress concentration. In a corrosive environment, stress concentration will cause stress corrosion cracking, which is also the main failure mode of high-strength yoke plates in corrosive environments. Therefore, we should choose a plate thickness that is 20% to 30% greater than that in a normal environment, use large corner radius transitions, and have a uniform and symmetrical cross section to avoid stress concentration.
Fitting accuracy
Excessive installation gaps between the Electric Yoke Plate and insulators, clamps, and bolts can lead to crevice corrosion. The oxygen concentration inside the gap is lower than that outside, forming an oxygen concentration cell, which causes rapid corrosion of the substrate inside the gap, resulting in bolt jamming and yoke plate breakage. Therefore, it is necessary to determine the fitting accuracy, prioritize planar contact, avoid point or line contact, and reduce gap space.
Hot Tags: electric yoke plate, China electric yoke plate manufacturers, suppliers, factory, L 1240 type yoke plate, LF Yoke Plate, LV 1020 type yoke plate, LV 1020 Yoke Plate, LV 2115 Yoke Plate, LV 2518 type yoke plate
