Bolt J-clamp Structure and Selection.

Structure

The J-type bolt clamp consists of two J-elements with wedges and one bolt. It falls under the category of second-generation wedge clamps..

As is commonly understood, the contact performance of a connection clamp is closely tied to the magnitude of contact resistance. Factors influencing contact resistance include contact pressure, contact area, and conductor material. The wedges of the upper and lower J-elements interlock through the longitudinal fastening force applied by the bolt. Following installation, the two J-elements apply lateral force to the conductor, inducing elastic deformation in the J-element to establish stable contact pressure between the conductor and the wedge, as well as between the wedges themselves. This results in (multi) point contact between the conductor and the wedge, while the wedge makes surface contact. As the wedges interlock, lateral friction aids in the self-cleaning of the clamp and the conductor. These characteristics collectively ensure the robust connection performance of the clamp.

The bolt J-clamp employs wedge-shaped constant contact pressure technology. The longitudinal fastening force of the bolt and the transverse force exerted by the two J-elements on the conductor operate independently. This ensures that even if the bolt's spring gasket gradually loses elasticity during operation and the fastening force diminishes, the contact performance remains largely unaffected, with minimal impact on environmental conditions and operating temperatures. Consequently, it offers performance comparable to that of ejection-type wedge-shaped clamps without the need for specialized installation tools.

Furthermore, as the wedge portion of the J-element makes full contact with another J-element, the bolt J-type clamp creates at least three stable and reliable current paths. This minimizes the clamp's body and contact resistance while enhancing its rated current carrying capacity.

Select

As previously discussed, the stability of the J-type bolt clamp is not solely reliant on the fastening force of the bolt, but rather on the inherent elasticity of the material, the specific structure of the clamp, and the material properties of the alloy to ensure long-term operational performance. Hence, material selection should align with the clamp's design, and a heat treatment and grinding process yielding moderate hardness and a reasonable elastic modulus should be employed to suit actual application conditions. Currently, J-type bolt clamps available in the market are manufactured through forging and casting methods, each with distinct characteristics in alloy materials. Cast clamps may lack the elastic deformation required during installation, and the wedges may not achieve close contact to provide stable contact pressure. Therefore, attention to detail is crucial when making selections.

The bolt J-type clamp J-elements are categorized into three series: A, B, and C, each with distinct specifications. When paired, these series are suitable for connecting conductors of varying wire diameters..

50. A series J element: A1, A2, A3, about suitable for connection below 95mm2
50. C series J elements: C1, C2, C3, C4, C5, C6, suitable for connection of 185mm2 to 300mm2
50. B series J elements: B1, B2, B3, about 95mm2 to 150mm2

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