JKLYJ-10KV-185 steel cored aluminum stranded wire for all aluminum high-voltage overhead insulated conductor

Description :

　　All aluminum high-voltage overhead insulated line manufacturer JKLYJ-10KV-185mm2

　　Characteristics of overhead insulated power lines:

　　The insulation performance of overhead insulated lines is good. Due to the addition of an insulation layer, overhead insulated conductors have superior insulation performance compared to bare conductors, which can reduce the distance between lines, lower the insulation requirements for line supports, and increase the number of circuits installed on the same pole. Good moisture and corrosion resistance. Due to the insulation layer on the outer layer, overhead insulated wires are less susceptible to oxidation and corrosion than bare wires, and have stronger moisture and corrosion resistance, which can extend the service life of the line. Prevent external damage, reduce the influence of external factors such as trees, floating objects, metal oxide films, and dust, and minimize phase to phase short circuits and grounding faults. The strength meets the requirements. The insulated wire is tough, and the mechanical strength of the entire wire meets the requirements of stress design. However, some new problems have also arisen during the application of insulated wires. Among them, a prominent issue is the occurrence of wire breakage faults when struck by lightning.

　　Lightning strike fault condition

　　Lightning overvoltage flashover in distribution networks, which refers to the discharge of high current at or above atmospheric pressure, is a form of arc discharge. The cause of insulation wire breakage caused by lightning is the same as that of bare wire, which is caused by lightning overvoltage damaging the insulation of the line, resulting in short circuit grounding of the line. Due to the fact that our 10kV distribution network is grounded through arc suppression coils, the current flowing through the grounding during single-phase grounding is compensated, and single-phase grounding faults generally do not cause disconnection. When a metallic short circuit channel is formed due to flashover between two or three phases, causing thousands of amperes of continuous current at the power frequency, the arc energy will suddenly increase.

　　When bare conductors are used in distribution lines, lightning strikes (including direct lightning and induced lightning) can cause line flashover. At this time, the continuous power frequency short-circuit current causes the arc to quickly dissipate on both sides of the lightning point of the conductor under the action of electromagnetic force. The lightning current flows quickly into the ground through the lightning arrester of the line, switch, transformer and other equipment, or triggers a trip before the power frequency current burns the conductor, so wire breakage accidents rarely occur.

　　However, when the insulated wire is struck by lightning, the situation is different. Lightning overvoltage causes the insulator to flashover and break through the insulation layer of the insulated wire. The insulation material near the breakdown point hinders the rapid movement of the arc along the surface of the wire to both sides. Therefore, the arc can only burn at the breakdown point. The heat generated by the power frequency arc current (kA/ms level) of up to several thousand amperes is concentrated at the insulation breakdown point and quickly melts the wire before the circuit breaker trips. The flashover melting point is usually within the range of 10-30cm at both ends of the insulator of the wire, because the electric field distribution in this range is weak.

　　When lightning strikes insulators, the flashover of insulators depends on the overvoltage value and the insulation level of the line. The probability of arc generation usually depends on multiple parameters: rated line voltage U2, flashover path L, time of lightning impact, magnitude of lightning current, and line parameters. The parameters mainly depend on the average gradient of operating voltage along the flashover path. According to the formula, it can be calculated that the heat generated by power frequency continuous current will be 10000 times greater than the heat generated by lightning current. It can be seen that induced overvoltage is the cause of lightning induced wire breakage, while power frequency continuous current is the determining factor causing wire breakage.

　　Looking at the relationship between the arc current value and the melting time of bare and insulated wires with the same cross-section. The melting time of insulated wires is extremely short. For insulated wires and bare wires of the same thickness, the melting time of insulated wires is only 1/5 to 1/10 of that of bare wires. This means that the possibility of wire breakage increases before the substation protection action and interruption of fault current. Due to the fact that insulation wire breakage usually occurs in the event of a two-phase or three-phase short circuit fault, there are also many cases of two-phase or three-phase breakage.

　　Protective measures for lightning induced wire breakage

　　The methods for preventing lightning strikes and wire breakage of overhead insulated wires can be summarized as two main methods: "blocking" and "diverting".

　　'Blockage' refers to improving the insulation level of the power line, reducing the probability of insulation lightning flashover, and preventing the construction of power frequency arc after lightning flashover; 'Guidance' means allowing the line to have a certain probability of lightning flashover, but it is necessary to 'guide' the arc root of the continuous current of the power frequency after lightning flashover, that is, to partially strip the insulated wire, make the insulated wire near the insulator partially bare, install anti arc clamps, so that the power frequency arc root can transfer and slide on the stripped part, instead of being fixed at a certain point and burned, thus protecting the wire from burns.

　　Taking JKLYJ-10KV-185mm2 as an example:

　　The letters JKLYJ represent the model number

　　10KV represents the voltage level

　　185 represents the square of the cross-sectional area

　　Standard GB/T14049-2008 for all aluminum 10kV overhead insulated conductors

　　Dazheng Wire Co., Ltd. is located in Dazheng Industrial Zone, Renqiu City. The company mainly produces steel core aluminum stranded wire, steel core aluminum alloy stranded wire, aluminum clad steel core heat-resistant aluminum alloy stranded wire, steel core high-strength heat-resistant aluminum alloy stranded wire, aluminum clad steel core aluminum stranded wire, aluminum clad steel stranded wire, aluminum alloy core frame insulated cable, overhead insulated wire 1-35kV, OPGW optical cable, OPPC optical cable, ADSS optical cable, steel stranded wire, aluminum stranded wire, with a total of more than 100 varieties and more than 3000 specifications. Located near Baiyangdian, the pearl of North China, the 106 National Highway, Beijing Kowloon Railway, and Jinbao Highway run through the city. It is 156km north of Beijing and 120km east of Tianjin, making transportation very convenient

　　Dazheng Electric Wire Co., Ltd. relies on advanced production equipment and exquisite technical processes With complete testing equipment and advanced testing technology, modern scientific management methods, and a rigorous quality assurance system, we have received high praise from customers for many years in a row.

　　Dazheng Electric Wire Co., Ltd. takes "meeting customer requirements and enhancing customer satisfaction" as its purpose and "quality is life, integrity is fundamental, and customers are God" as its business philosophy. It cultivates the market, improves product quality, and constantly pursues the perfection of products and services to meet the higher needs of customers.

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• All aluminum high-voltage overhead insulated conductor