Precautions for the hottest installation of power

2022-09-22
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Precautions for installing power cable connectors

conductor connection requires low resistance and sufficient mechanical strength, and sharp corners cannot appear at the connection. Crimping is commonly used for the conductor connection of medium and low voltage cables, and attention should be paid to crimping:

(1) select the conductor connecting pipe with appropriate conductivity and mechanical strength

(2) the fit gap between the inner diameter of the crimping pipe and the outer diameter of the connected wire core is 0.8 ~ 1.4mm

(3) the resistance value of the crimped joint shall not be greater than 1.2 times that of the equal section conductor, and the tensile strength of the copper conductor joint shall not be less than 60n/mm2

(4) before crimping, the outer surface of the conductor and the inner surface of the connecting pipe shall be coated with conductive adhesive, and the oxide film shall be destroyed with a wire brush

(5) sharp corners and burrs on connecting pipes and core conductors shall be polished smooth with a file or sandpaper

2 internal semiconductor shielding treatment

if the cable body has an internal shielding layer, the internal shielding layer of the connector must be restored when making the connector, and a part of the internal semiconductor shielding of the cable must be reserved, so that the internal shielding of the connector on the connecting pipe can be connected with each other, ensuring the continuity of the internal semiconductors, so that the field strength at the connector is evenly distributed

3 treatment of external semiconductor shielding

external semiconductor shielding is a semi conductive material that acts as a uniform electric field outside the insulation of cables and connectors. Like the internal semiconductor shielding, it plays a very important role in cables and connectors. The outer semiconductor port must be neat and uniform, and it is also required to have a smooth transition with the insulation, and the semiconductor tape is added around the joint to connect with the semiconductor shield outside the cable body

4 treatment of cable reaction force cone

the reaction force cone with accurate shape and size during construction. 6. The potential distribution of the lap sample on the whole cone surface is equal. When making the cross-linked cable reaction cone, special cutting tools are generally used, or a slight fire can be used to heat it, and a sharp knife is used to cut it. After it is basically formed, it is scraped with 2mm thick glass, like our tensile testing machine, and finally polished with sandpaper from coarse to fine, Until smooth to

5 metal shield and grounding treatment

the role of metal shield in cables and joints is mainly used to conduct cable fault short-circuit current and shield the electromagnetic interference of electromagnetic field on adjacent communication equipment. Under the operating state, the metal shield is at zero level under the good grounding state. When the cable fails, it has the ability to conduct short-circuit current in a very short time. The grounding wire shall be reliably welded, the metal shield and armor strip on the cable body of the box at both ends shall be firmly welded, and the grounding of the terminal head shall be reliable

6 joints are the guarantee to ensure the safe and reliable operation of the joints. Water and moisture shall be prevented from seeping into the joint. In addition, joint protection grooves or cement protection boxes shall be erected at the joint position

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