Suspention clamp hangs conductor or ground wire. They work with the insulator of link fitting to tower arms or substation structures. The material of clamp is malleable iron or aluminum alloy. The suspension angle of suspension clamps is not less than 25 degree. The redius of curve is not less than 8 times the diameter of the installed leads. The percentage of the grip on different kinds of leads to the calculating capicity of snap meets the international standard.
Table of Contents
- What is suspension clamp
- The function of suspension clamp
- Type of suspension clamp
What is suspension clamp
The suspention clamp is a kind of fixed hardware. There are also two types of suspension hardware. They include tension fittings and limited grip hardware. The suspension clamp hangs or supports the conductors. They coould bear the vertical load hardware.
The function of suspension clamp
The suspension clamp is for overhead lines or substations. They can hang the conductors or arresters on the insulators. They could hang the arresters on the tower by the connectors as well. It also used for fixing and supporting the conductor and non-linear rod on the pole.
Type of suspension clamp
There are numorous kinds of suspension clamps. They can classify in different method. Here are three method to classify them. Here we will introduce three ways to classify them.
Some of the abbreviations as follow:
C(X)—suspension clamp,
G– fixed, S—double clamp,
U—U shaped screw,
J—strenghthened,
H—Aluminum Alloey,
F—anti-corona,
K—carried up type,
T—carry bag type,
A—with socket clevis eye,
B—with U-shaped clevis,
X—hang-down type
Classified by the structure of the suspension clamp
CGU suspension clamp
CGU suspension clamp is als called general type suspension clamp. You can customize your fixed u-shaped screw suspension clamp(CGU). All specifications are avaliable with the drawings porvided. All the products meets the international standards.
The materials
Clamp, plate: forging iron
Closed pin: stainless steel
Other parts: steel
Suspension clamp with U-shaped plate
Main usage and feature
The diameter of the wire clip slot is large. It is for large section steel-cored alumimum conductors or conductors wrapped. All the conductors have pre-twisted wire sheathed grommets. If you use the common hanging plate, it is easy to cause deformation. These are the two reasons the U-saphed hanging plate adds to the upper end of the wire hanging plate. The combinaton not only reduce the bending movement of the hanging plate but also change the direction.
Suspension clamp with socket clevis eye
Componants and materials
The material of the socket is forging iron.
The endfittings are stainless steel.
Other mateirals is steel.
All the componants are hot-dip galvanized zinc and are corrusion r.esistent.
Strenghthen suspension clamp—CGJ Type
Here are some main features:
Clamps have high vertical devastating load;
The cable will not get out of the clamp even in the condition of unblanced icing on adjacent gears. This means the clmaps may have enough tensile strenghth;
For the clip of the lightning conductor, the grip strength should be no less than 25% of the rated steel strand tensile strength. The grip of the clip for the steel core aluminum stranded wire should be no less than 30% of the rated wire tensile strength.
Anticorona suspension clamp— CFG Type
It is for 330kv—500kv transmission line or high altitude transmission line. This kind of clamp have high anti-corona ability. The componetns of the anti-corona type includes a flared hull, two (or four) bolts (to fasten the boat hull) and the steel hoop of the suspension part. The steel hoop is in the middle of the hull, which also known as the suspension bar type.
Materials: clamp and plate—aluminum alloy; deadend link—stainless steel; spare parts–steel
This type of anti-corona suspension clip divides into two types: line and jumper. The jumper one also can use on substation and has weak grip.
Classified by the position of rotating point
Center swing suspension clamp
Main features:
The axis of the hull is above the centerline of the wire. The rotation coincides with the deflection of the wire.
Carried-up suspension clamp—CGF Type
Characteristics:
The hull axis lies below the centerline of the wire. The hull axis also has a tendency to be unstable, and its rotation often exceeds the deflection of the wire.
Function:
It is for the overhead ground wire placed on the top of the tower, and when the split wire arranges on the bar.
Hang-down suspension clamp—CGF Type
Material:
clamp and plate—ZL102 aluminum alloy; deadend link— stainless steel; spare parts—steel
Carried bag type suspension clamp
Material:
clamp and plate—ZL102 aluminum alloy; deadend link— stainless steel; spare parts—steel
Classified by raw materials
Aluminum alloy suspension clamp
Features:
high strength,
strong corrosion resistance,
low hysteresis loss,
low energy consumption and
energy saving.
It is also benefit to control the generation of corona. It is for 330kv to 500kv transmission line. This kind of calmp need to meet the standard of the corona production in the high altitude area.
It is for 220kV lines to replace the malleable cast iron lines, which has good economic benefits.
Steel plate punching suspension clamp
The hull of the wire clamp stamps from steel plate, without hanging plate. The hanging point is above the axis of the wire. The u-bolt is upware installed for convenient construction. The production process is simple with short cycle, high yield, light weight and few accessories. It is suitlable for steel-cored aluminum stranded wires and medium and small sections aluminum standed wire.
Melleable cast iron
The hull, plate and clevis is cast iron. The material of closd pin and other spare parts are steel. We use hot-dip galvanized technic for cast iron and steel.
What is hysteresis loss?
Because of the magnetic material in the AC iron core coil, hysteresis and eddy current can create in the alternating magnetic field. This may lead power loss and heat generation to the power loss of the coil resistance. The suspension clamp’s curvature radius should be at least 8 times the diameter of the installed wire.
If you interested us, our next passage is still about suspension clamp. We will introduce 7 other types of suspension clamp. Then demostrate how to choose a suitable suspension clamp.