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It is crucial to ensure that the high voltage power cable you install for the underground transmission electric power should be of the highest of quality. While purchasing the right high voltage power cable, ensure that it is durable enough to withstand extreme conditions. Considering such cables deal with high voltage and can cause serious electric shocks, the materials should be made of superior quality and must include a number of energy-efficient technology. Maintain a checklist of all your cables, especially if it is an industrial setting. A repository of all your wires and cables should help in giving you a clear idea of when the next repair or maintenance check is. Irrespective of its nature, ensure that the cable you use, especially for residential purposes, is a common type so that it becomes easier to understand and maintain it. Let an expert in the field handle the repairs or any check of the high voltage power cables. Despite having a handy manual, it should be looked into with guidance to avoid a catastrophic event. An expert will be able to gauge through the damage and accordingly repair it without any serious repercussions. For underground cable maintenance, inspect how clean the surroundings are. Clean up the debris or dust around regularly and periodically check its cable joints, splices and other ground connections. Run the necessary tests to keep up with the maintenance of high voltage power cables. Cable testing and Cable Diagnosis are required to judge the cable’s current condition and locate any breakage. High voltage power is not something one must take lightly. Often used for commercial, residential and industrial set-ups, high voltage power cables must be routinely checked so that you can save any expenses or avoid unnecessary outages from happening, especially considering how some outages can disrupt work systems and everyday activities. Known for its superior quality with the right ISI marks and approvals, head out to Finolex Cables for premium products and forget all your electrical worries.

A high voltage power cable’s structure contains at least one to more conductors, apt insulation and a jacket for protection. Depending on the level of voltage power, the cables can have additional layers for the insulation jacket to control the electric field in the conductor. More often than not, high voltage power cables are used in the operation of conductors that go beyond 2,000 volts. Bearing this amount in mind, there will be a conductive shield around each insulator conductor which helps in equalising electrical stress. This shield is sometimes called the Hochstadter shield as Martin Hochstadter had patented this technique back in 1916. Installed at the ends of shields are ‘stress relief cones’. Power distribution cables of 100,000 V are insulated well with oil and paper. They function via a stiff steel pipe and a semi-stiff or rigid aluminium or lead covering.

Now that the real and physical power of high voltage is understood, it is easy to bear in mind its workings and structure. Individual conductors carry high voltage and require a specific high voltage power cable for electric power transmission. A typical high voltage power cable requires the following: A conductor Insulation that can be used for underground and under the water Cable and joints to ensure that the high voltage impact is controlled and doesn’t lead to its insulation breaking down Different types of high voltage cables cater to various applications. Some are crucial for instruments, alternating current (AC) and direct current (DC) power transmission, and systems for ignition. The idea behind having a high voltage power cable system is to prevent any contact between other objects or living beings with a high voltage conductor. Moreover, its leakage current must be aptly controlled and monitored. The insulation of a high voltage power cable must be regulated even when there’s a spike in high voltage owing to ozone-produced electric discharges in the air. Each cable terminal and joint must have a layer of a metallic shield on the insulation, connected with the ground. This metallic shield is used to equalise the di-electric stress layer that contains the insulation. Features of a high voltage power cable: High voltage power cables are special in nature, working with specific switching and distribution panels. They enable control rooms to switch and be controlled remotely or manually for the testing of individual supply systems. Sub-stations for high voltage power cable can lower the voltage in a bid to distribute it to local areas. The semiconducting layers must be seamless and should be a few micrometres. Any fission or space between the fusion of the layers and insulation can be very dangerous.

A high-voltage cable (HV cable) is a cable used for electric power transmission at high voltage. A cable includes a conductor and insulation. Cables are considered to be fully insulated. This means that they have a fully rated insulation system that will consist of insulation, semi-con layers, and a metallic shield. This is in contrast to an overhead line, which may include insulation but not fully rated for operating voltage (EG: tree wire). High-voltage cables of differing types have a variety of applications in instruments, ignition systems, and alternating current (AC) and direct current (DC) power transmission. In all applications, the insulation of the cable must not deteriorate due to the high-voltage stress, ozone produced by electric discharges in air, or tracking. The cable system must prevent contact of the high-voltage conductor with other objects or persons, and must contain and control leakage current. Cable joints and terminals must be designed to control the high-voltage stress to prevent the breakdown of the insulation. The cut lengths of high-voltage cables may vary from several feet to thousands of feet, with relatively short cables used in apparatus and longer cables run within buildings or as buried cables in an industrial plant or for power distribution. The longest cut lengths of cable will often be submarine cables under the ocean for power transmission.

Increase transmission capacity. Las lines of transmission of 1000kV UHV have a natural power of almost 5 million kilowatts, about five times that of 500kV transmission lines. The transmission capacity of ±800kV DC UHV can reach 6,4 million kilowatts, 2,1 times that of ±500kV UHV DC and 1,7 times that of ±620kV UHV DC. Improve stability limit. The electrical distance of the 1000kV line is equal to between 1/4 Y 1/5 of the 500kV line of the same length. In other words, under the condition of transmitting the same power, the long-distance transmission distance of 1000kV UHV line is about 4 times that of the 500kV line. Utilizing ±800kV direct current transmission technology enables long-distance power transmission, and the economical transmission distance can reach 2500 km and more. Reduce line consumption. The resistance consumption of a 1000kV AC line is one fourth of that of a 500kV AC line when the total cable section and transmission capacity are equal.. The DC line resistance consumption of ±800kV is the 39% of the ±500kV DC line and the 60% ±620kV DC line. Reduce investment in engineering. The 1000kV AC transmission solution has a combined cost per unit of transmission capacity that is approximately three quarters that of the 500kV transmission solution.. The cost per unit of transmission capacity of the ±800kV direct current transmission scheme is also approximately three quarters of that of the ±500kV direct current transmission scheme..

  Established in 1994, Shanghai Qifan Cable Co., Ltd. (stock code 605222) has now developed into an innovative wire and cable enterprise with strong research and development capacities after around 30 yeas in the industry. It’s one of Top 10 cable manufacturers in China. Its products cover low voltage power cable, medium voltage power cable, extra high voltage power cable, submarine cable, control cable, instrumentation cable, building wire, flexible rubber cable, fire rated cable,shipboard cables, aeronautics and aerospace cables, nuclear cables,water-tightness cables, mining cables, trailing cables, high temperature resistant cables, robot cables,electric vehicle cables, renewable cable, solar cable, industrial cable, Lan cable, coaxial cable etc. A total of nearly 30 product series with nearly 4,000 types and more than 50,000 specifications. The company has 4 large-scale production bases in Jinshan Shanghai, Chizhou Anhui, Yichang Hubei，and Minhang Shanghai. In 2022, Qifan plans to invest 1.8 billion yuan to build the Beihai Qifan submarine cable production base and the project is in active preparation. Plant has a series of imported production lines including Niehoff copper drawing lines, Troster Germany and Maillefer Finland 500KV VCV lines, stranding machine from Pourtier France, SKET Germany, Caballe Spain, 220KV and 35KV production line plus SIKORA X – RAY 8000 on-line eccentricity measuring unit from Germany, Plant have gotten ISO 9001, ISO 14001, OHSAS 18001. Plant passed TUV, VDE, UL, CE, SAA, BS etc. certificate. Products are exported to worldwide covering Australia, Mongolia, Thailand, Malaysia, Peru, Philippines, Egypt, Turkey, Zambia, New Zealand, Cuba, Congo, Indonesia, Vietnam, Mexico, Singapore, etc. Quick and good customer service, short lead time is our focus. With our experience, quality, dedication, innovation, Qifan cable is the correct choice for all you cable need.

  QIFAN Cable was designed for harsh environments Industrial businesses operate in some of the harshest environments and provide the world with products that we all depend on. Their operations depend on products that can withstand extreme temperatures and elements, pressure, corrosive materials, rough handling, and vibration. These products must be able to maintain their integrity and operate with precision in order to ensure smooth operations. At QIFAN Cable , our wide variety of harsh environment products are engineered to meet the unique challenges these industries require. We understand how critical operational efficacy is in these demanding environments and we design products and solutions that are tested and proven to deliver dependable performance. While each industry requires cables that meet their own specific requirements, QIFAN Cable strives to provide the best products to meet these needs.   With the adoption of Industry 4.0 and the integration of technology, cables must be able to support increasing data utilization, control processes, security and energy needs. QIFAN Cable can provide cables that provide better performance and can still be installed in environments not suited for traditional enterprise rated cables. Additionally, with multiple manufacturing locations, we can provide products quickly, reducing downtime and keeping industrial facilities up and running.

  Electric cables used to transmit information are quite different from power cables, both in function and in design. Power cables are designed for high voltages and high current loads, whereas both voltage and current in a communication cable are small. Power cables operate on direct current or low-frequency alternating current, while communication cables operate at higher frequencies. A power cable usually has not more than three conductors, each of which may be 1 inch (2.5 cm) or more in diameter; a telephone cable may have several thousand conductors, the diameter of each being less than 0.05 inch (0.125 cm).   Protective coverings for electric communication cables are similar to those for electric power cables. They usually consist of an aluminum or lead-alloy tube or of a combination of metallic strips and thermoplastic materials. The insulation of a telephone cable is composed of dry cellulose (in the form of paper tape wrapped around the conductor or paper pulp applied to the conductor) or of polyethylene. The insulation thickness is a few hundredths of an inch or less. A coaxial cable, which first gained widespread use during World War II, is a two-conductor cable in which one of the conductors takes the form of a tube while the other (smaller but also circular in cross section) is supported, with a minimum of solid insulation, at the centre of the tube. Several of these coaxial units may be assembled within a common jacket, or sheath.   The construction of long submarine cables for either telephone or telegraph service is somewhat different from that discussed previously. A transatlantic cable for telegraphs was first completed in 1858 and for telephones in 1956; a fibre-optic cable first spanned the Atlantic Ocean in 1988. See also undersea cable.

  The most common type of electric power cable is that which is suspended overhead between poles or steel towers. These aerial cables consist of a number of wires, usually of copper or aluminum, twisted (stranded) together in concentric layers. Copper or aluminum is chosen for high electrical conductivity, while stranding gives the cable flexibility. Because aerial cables are frequently subjected to severe environmental stresses, alloys of copper or aluminum are sometimes used to increase the mechanical strength of the cable, although at some detriment to its electrical conductivity. A more common design is to include in the stranded cable assembly a number of high-strength, noncorrosive steel wires. Many aerial cables, especially those operating at high voltages, are bare (uninsulated). Cables operating at lower voltages frequently have coverings of asphalt-saturated cotton braid, polyethylene, or other dielectric (nonconducting) material. These coverings offer some protection against short-circuiting and accidental electric shock.   Another type of electric power cable is installed in underground ducts and is extensively used in cities where lack of space or considerations of safety preclude the use of overhead lines. Unlike an aerial cable, a buried cable invariably uses commercially pure copper or aluminum (mechanical strength is not a problem underground), and the stranded conductor is frequently rolled to maximize its compactness and electrical conductance.   Aerial and underground power cables compose a major portion of the electrical circuit from the generator to the point of utilization of the electric power. The balance of the circuit (and sometimes the entire circuit) may, however, require specialized cables. Illustrative of these usages and of the special conditions to be met are cables for use in steel mills and boiler rooms (high temperature), on mobile equipment (vibration and excessive flexing), in chemical plants (corrosion), for submarines and mines (mechanical abuse), near nuclear reactors (high radiation), and on artificial satellites (pressure extremes).

On February 21, 2019, Shanghai Qifan Cable Test Center was approved by cnas and obtained the certificate.