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How to select cable fixing power fittings
2021-09-04

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With the rapid development of the city, higher requirements are put forward for the beauty and safety of the city. The high voltage cables of 35~220KV

are widely used in the power transmission and distribution network of large cities. Cables are usually laid in cable trenches and properly fixed. In addition,

the installation of cables from high-voltage line towers up and down also needs to be fixed. 


In order to ensure the safety of cable operation and take into account energy-saving factors, our company has developed and produced a series of special

high and low voltage cable fixing fittings according to users' different installation methods and different places of use to meet the needs of users. Since

there is no national standard for this kind of products, the naming of models and specifications on the market is neither scientific nor uniform. Our company

has made specifications for this. Please pay attention to the selection when designing, purchasing and installing.

 

Because some companys products now adopt computer three-dimensional design and simulation analysis, the structure is more reasonable, high-

strength corrosion-resistant aluminum alloy is used as the main material of the clamp, stainless steel fasteners and aging-resistant rubber pads are used,

which is more energy-saving and safer in operation .


Cable fixing hardware selection and installation instructions:

High-voltage cables are often single-core cables due to technical reasons. However, single-core cables have large impedances during single-phase operation

and have large line losses. Generally, it is recommended to arrange three three-phase single-core cables in order to reduce impedance. Therefore, the cable

fixing clamp is divided into single-core and three-core according to the number of fixed cables. The three cables are separated and fixed independently to

form a pin-shaped clamp as the cable terminal  fixing clamp, and the structural feature is Y-shaped; and the three cables are all together. The structural

feature of the fixed and formed "product" type clamp is P type; according to the installation base, it is divided into ordinary type and base independent

fixed type, and the spring type is called shock-proof type.


Design requirements for cable fixing fittings:

The P-type cable fixing clip with three cables arranged in the product font should comprehensively consider the force distribution between the cables when

designing, and try to make the force uniform and dispersed, and at the same time, reduce the side of the cable when the clamp is compressed. It does not

pass through the friction force in the center of the cable to avoid slipping and bulging between the layers of the cable and destroying the electrical performance.

The spiral direction of the anti-vibration spring should be consistent with the direction of the internal thread of the compression nut, so that the spring tension

becomes smaller when tightening, which is convenient for operation, and the tension becomes larger to prevent loosening when reversing.