Cable connector Failure Analysis

Due to the different cable connectors operating conditions , technical level and quality of construction workers is uneven , because cable accessories , cable connectors resulting in failure also varies .
The cable joint production process.
Poor connector contact surface treatment . As the production or storage conditions , and thus the terminals or impurities , the presence of burrs , and the inner wall oxide layer of the  Terminal BLOCK connecting tube . It is not important to the defect , but seriously affect the quality of the connection wires . Production of alumina membranes and insulation materials , especially the hard layer is aluminum surface easily , aluminum conductors than copper wires strictly high-tech .
Damaged wires. Insulation strength of a larger , peel cut difficulties. Construction workers circumcision electrician knife left- right cut , sometimes simply mark the depth of cut with a hacksaw ring , often not good wire damage.
Wire in place . Conductor connection cut insulation stripping length requirements crimp connector hole depth , hole depth 5mm, but non-standard products , making it easy enough to peel or cut the ends curled length bit string line to form a gap , the wall thickness of the conductive gold alone , resulting in increased contact resistance large heat generation .
Pressure is not enough .
Today, only refer to the number of the information pit in the production process of the cable connection at each end of a standard connection diagram , but no detailed description of the area and depth of curl curled , the number of pits and pressure sufficient to meet the construction workers , but can not determine how efficient . The following reasons cause enough pressure wire connector :
Insufficient pressure curl machine . Crimping machine manufacturing plant , but there is no uniform standard, after some mechanical pressing and curling tongs narrow pit in place , the upper die and a lower die disagreed and enforcement of foreign and domestic standards , do not meet the wire section .
Connection assembly space . Most cable terminal connector for connecting cable production equipment or greaseproof paper fan wires and pressure pipes . Circulating fan wire core theory is the same as the effective cross-section , but the actual operation shows that curl effect is very different . Conductor of the cable is a round wire twisted core deposits a large common space , the pressure contact force is not enough compression . The contact resistance is inversely proportional to the applied pressure , resulting in increased resistance. One important reason is that the connector portion of the cable connector fever. On the composition of the structure of cable products
The vast majority of the section ( segment ) is identical with the shape of wire and cable ( manufacturing error is ignored ) , the elongated product , it is because as the system or apparatus using a wire or coil characteristics. Therefore, the analysis of the structure of the cable product composition , it is only observed from the cross -sectional analysis .
Structural elements of wire and cable products , and can be divided into the protective layer wire , insulation , shielding, and the four main structural elements , fillers and tensile Network Cabinet  components. According to the needs and applications , some products such as simple structure, only the structure of a line , such as bare overhead line , the line of contact of the copper and aluminum bus ( bus ) ; abroad these products rely on the electrically insulating insulator and spatial distance installation ( i.e., the use of air insulation ) . Ensure .
Line 1 is the basic ingredient of the product of the main current or electromagnetic transmission of information . Conductive core wire is conductive properties of copper , aluminum and other nonferrous metals outstanding . In optical communications fiber optic network over the past three decades of rapid development, optical fiber as a conductor .
2 insulation layer coated on the external electrical insulated wire components. Ensure that the transmission of electromagnetic waves or current , and the light does not flow out along the wire , the potential of the conductor ( i.e., around the object , i.e., a potential of the voltage ) can be separated , both to ensure the normal transmission line , and the safety of sponsorships and other objects . And an insulating layer is formed of a conductor cable products ( except the bare wire) must have two basic components .
3 When the protective layer , wire and cable products are installed in different environments , the product must be whole , especially for members of the protective effect of the insulation layer , the protective layer .
As the insulating material has excellent electrical insulation performance requirements , must require a very high purity , impurity content of the material ; often do not consider the external protection , so the outside world ( ie , installation , use, and use a variety of mechanical force ) bear or resistance , resistance to atmospheric , chemical resistance or oil to prevent the invasion of alien species , reducing the fire hazard and must be borne by the various protective layer structures.
Committed many good external environment ( such as clean , dry, without external mechanical forces indoor ) cable products , or an insulating layer material itself has a certain mechanical strength , weather resistance of the product , the shield member can not .