ClicksThe cable accessory connector plays the role of link in the power transmission and distribution line. Once improperly handled, it will cause line faults such as heat generation. Therefore, the cable accessory connector in the line has very strict requirements. The following describes the standardization requirements of cable accessory connectors in the following lines and the corresponding operating precautions:
1. The connection conductor connection of the cable accessory conductor requires low resistance and sufficient mechanical strength, and no sharp corners should appear at the connection. The commonly used connection of medium and low voltage cable conductors is crimping, and the crimping should pay attention to:
(1) Choose a conductor connecting pipe with appropriate conductivity and mechanical strength;
(2) The fit gap between the inner diameter of the crimping tube and the outer diameter of the connected core is 0.8～1.4mm;
(3) The resistance value of the joint after crimping should not be greater than 1.2 times that of the conductor of equal cross-section, and the tensile strength of the joint of the copper conductor should not be less than 60N/mm2;
(4) Before crimping, coat the outer surface of the conductor and the inner surface of the connecting pipe with conductive glue, and use a wire brush to destroy the oxide film;
(5) Sharp corners and burrs on the connecting pipe and core conductor should be smoothed with a file or sandpaper.
2. Semiconductor shielding treatment in cable accessories:
Where the cable body has an inner shielding layer, the inner shielding layer of the conductor part of the crimping tube must be restored when the joint is made. A part of the inner semiconductor shielding of the cable must be reserved so that the inner shielding of the connector on the connecting tube can communicate with each other. Ensure the continuity of the internal semiconductor, so that the field strength at the joint is evenly distributed.
3. Treatment of semiconductor shielding outside cable accessories:
The outer semiconductor shield is a semi-conductive material that acts as a uniform electric field outside the insulation of the cable and the cable accessory joint. Like the inner semiconductor shield, it plays a very important role in the cable and the joint. The external semiconductor port must be neat and uniform, and smooth transition with the insulation is required, and a semiconductor tape is added to the cable accessory joint to connect with the semiconductor shield outside the cable body.
4. The treatment of cable accessory cable reaction force cone:
During construction, the reaction force cone with the exact shape and size has the same potential distribution on the entire cone surface. When making the cross-linked cable reaction cone, special cutting tools are generally used, or it can be slightly heated with a slight fire and carried out with a sharp knife. After cutting and basic shaping, use 2mm thick glass to scrape, and finally use sandpaper to polish from coarse to fine until smooth.
5. Metal shielding and grounding treatment of cable accessories:
The role of metal shield in cables and connectors is mainly to conduct cable fault short-circuit current, and to shield electromagnetic interference from electromagnetic fields to nearby communication equipment. In operation, the metal shield is at zero potential under a good grounding state. When the cable fails , It has the ability to conduct short-circuit current in a very short time. The grounding wire should be reliably welded, and the metal shields and armor tapes on the cable body of the box at both ends should be firmly welded, and the grounding of the terminal head should be reliable.
6. Sealing and mechanical protection of cable accessory joints:
The sealing and mechanical protection of the joint are the guarantee to ensure the safe and reliable operation of the joint. Prevent the penetration of moisture and moisture into the cable accessory joints. In addition, the joint protection groove or cement protective box shall be installed at the joint position.
