Last passage, we mainly introduce the type of the suspension clamp. In this passage, we will continously talk about other type of suspension clamp. However, another topic in today’s passage is how to choose a good suspension clamp, which is the important part
Other Type of Suspension Clamp
CTS Double Wire Jumper Suspension Clamp
C stands for suspension clamp
T stands for fixed
S stands for corona type
MGU Suspension Clamp and CGH Series External Pin Type Suspension Clamp
MGU type suspension clamp mainly used for overhead power lines and substation. They suspend the conductor and the lightning protection wire on the insulator or the lightning protection wire on the tower by connecting the hardware. It is made of melleable cast iron and aluminum alloy.
Wedge Suspension clamp
It is used for hanging the wire on the linear pole tower in the heavy snow area. The wedge suspension clamp used on the linear tower with the huge tensile strength.
Wear-resistant Suspension Clamp
Materials: clamps and plate—melleable cast iron; cosed pin—stainless steel; spare parts—steel
All the materials are againest corrosion with hot-dip zinc coating.
Suspension Clamp for Vertical-based Conductors
They are assembled by bolts from two suspension clamps and a pair of hangers. The top clamp and bottom clamp hang indpendently without interfere.
The advantage of installation and usage:
Reduce cost by using two stereotyped clamp with making two plates only.
The independent design of the upper and lower clamp makes the hull roated around the center.
The clamp can lean to the side with higher tension when the tension of two sides is imbalance, which avoid the additional bending movement of hanging plate due to the inability of the clamp to be offset.
The independent of the clamp provide the convenience for line channeling for construction and operation and maintenance.
Jumper Suspension Clmap
With the continuous increase of the voltage level, the conductors of each phase in the line develop from two-split conductors to three-split, four-split, six-split, and eight-split.
The suspension clips for split jumpers are used to suspend split conductors.
Suspension Clamps for Large Span and UHV Lines
Large span: the span is over 1000 meter and the height may reach 100 meter.
Why use: the wire needs to bear a large tension. We need to make sure the wire clamp release the wire when the wire is broken and also have a large hanging angle and a large radius of curvature.
Suspension Clamp for Large Span with Single Cable
Types: Multi-pulley; Crawler; Roller
Analyzing the stress of the lower pulley, roller and crawler calmps on the wire, it can be found that the main difference lies in the number of fulcrums and the degree of density, which are “sparse”, “dense” and “very dense” respectively.
When the fulcrum reaches a certain density, the stiffness of the wire will play a considerable role, so that the radius of curvature of the wire is basically close to the radius of the clip.
Choose of Suspension Clamp
Select on Types and Structure
The suspension clamp shoud able to bear the full load of the wire when hanging the wires.
The wire cannot slide in the clamp or get out of the insulator string when the system is in normal operation or broken.
The suspension clamp shall be able to bear the full load of the lighting protection line within the vertical span when hanging the lighting protection line.
The lighting protection wire is not allowed to slide in the wire clip when the tension is unbalanced.
Suspension Clamp Should have Enough Mechenical Strength
Suspended clamps mainly bear the combined load formed by vertical and horizontal loads of conductors or lightning conductors when the line is running.
When the maximum load of the conductor or lightning protection line occurs, after considering the safety factor, it should not be less than or equal to the failure load of the wire clamp.
Maximum load: the comprehensive value of the self-weight, ice-covered weight and horizontal wind load of the guide line or lightning protection line. The national standard stipulates that the safety factor of mechanical strength under normal conditions is 2.5.
Suspension Clamp Should have Standard Grip Strength
Grip strength: Refers to the determination of the grip strength value of the clip on which the conductor is installed under the specified test conditions.
The suspension clamp should have a certain grip on the wire or the lightning protection wire when the wire and lightning protection wire have uneven icing or uneven sealing load under the condition of line operation, that is, the wire should not be slipped out of the wire clamp under such conditions.
Suspension Clamp should have a Suitable Angle
Suspension angle: Due to the difference of the span and height of the tower caused by the terrain fluctuation, as well as the change of the conductor and the lightning protection wire due to the ambient temperature and the change of the load, suspension angles of the strands on both sides of the suspension point of the tower may be different.
In order to prevent the stranded wire from being damaged by excessive bending stress at the outlet of the clamp, a necessary check should be carried out to ensure that the actual hanging angle of the outlet on both sides of the wire clip does not exceed the national standards.
National standard: the suspension angle of the suspension clamp should not be less than 250, and the curvature radius of the suspension clamp should not be less than 8 times the diameter of the installed wire.