China Zhenglan Cable Technology Co., Ltd Company News

With the rapid increase of household electricity consumption, in order to ensure the safety of household electricity, consumers should pay attention to the following matters when purchasing household electric wires: 1. marks of electric wires According to the state regulations, the surface of the wire should be marked with the name of the manufacturer, wire product model and rated voltage mark.If there is any problem in the process of using the wire, please contact the manufacturer in time. 2. the appearance of the wire Users should pay attention to the appearance of the wire should be smooth and smooth, insulation and sheath layer without damage, mark printing is clear, the surface of the wire without greasy feeling, the thickness of insulation and sheath on the entire circumference of the wire section is uniform, not partial core, insulation and sheath should have a certain thickness. 3.The diameter of the conductor Users should pay attention to whether the conductor diameter is consistent with the section shown on the wire qualification certificate when purchasing the wire. If the conductor section is too small, it is easy to make the wire warm and cause short circuit.Other high-power household appliances such as air conditioners and microwave ovens shall use wires of 2.5 square millimeters or above. 4. Standard use The user should regulate the wiring, BV single core wire is best to wear the pipe when the fixed line, do not break the wire;Do not connect in the middle of a route;Do not touch the wire when the wire is connected to the electrical box (box);In addition, household appliances with large electricity consumption, such as air conditioners, should be supplied by separate power lines;It is best to keep a certain distance between weak and strong wires.

ABC cable with full name as Aerial bundled cables or aerial bundled conductors are overhead power lines using several insulated phase conductors bundled tightly together, usually with a bare neutral conductor. The first European system had a separate catenary wire but later the neutral conductor was modified to act as the messenger as well. In the late 1960’s a system was developed in which all the phase conductors and the neutral conductor are of the same construction. This type is known as the Four Core System and is also in use in many countries.   Why the ABC system? An electrical network should satisfy the need for high level of technology and the low cost of the network. In general the network should meet at least the following requirements: • low cost of total material • low cost of labour • low cost of installation • low cost of annual operation and maintenance • low cost of later extension • high reliability • low cost of achieving safety and technical requirements • low cost of total investment • minimal cost of line route clearing • minimum number of accessories and tools ABC Cable Applications Aerial Bundled Conductor cables can be used to replace bare conductor cables in overhead distribution systems. It is ideal for use in urban areas with congested power distribution and narrow lanes and by-lanes. The flexible system is much easier than conventional overhead power lines to re-route when demanded by changes in urban development plans. As replacement for bare overhead power lines in rural areas; • In areas where space is limited such as narrow streets and lanes; • In forests and woods where there is an increased risk of damage from fallen branches and trees; • As replacement for bare overhead power lines where prime importance is placed on reliability of supply; • Where supply voltage with a high degree of stability is required; • As reinforcement for existing overhead power systems without having to increase voltage; • In difficult terrain like hilly areas where the cost of installing underground cabling or overhead power lines is very high.   Zhenglan Cable Technology Co., Ltd       

(1) When the cable leaves the factory, both ends of it are sealed with plastic sealing sleeve.But in the construction process, after using a part, the remaining part of the wire head is simply wrapped, usually open air and no sealing measures, for a long time, water vapor will infiltrate the cable;   (2) When laying cables, it is necessary to cross roads, Bridges, culverts, etc.However, due to weather and other reasons, the cable trench is often filled with water, and occasionally the cable head is immersed in water.Poor sealing makes it easy for water to enter the cable.In addition, the outer sheath and even the steel armoring will be scratched when pulling and penetrating the pipe.   (3) After the completion of cable laying, the cable head was not made in time due to the restrictions of site construction conditions, so that the unsealed cable fracture was exposed to air for a long time, or even immersed in water, so that a large amount of water vapor entered the cable.   (4) In the process of making the cable end (including the terminal head and intermediate joint), due to the negligence of the construction personnel, there is no contact or immersion of the cable end in water;   (5) In the normal operation of the cable, when breakdown occurs for some reason, the water in the cable trench will enter the cable along the fault point, the cable insulation will be seriously damaged, and water will also cause the cable.  

Weather resistance   High-voltage overhead cable insulation, in addition to meeting the higher electrical performance requirements, but also requires good weather resistance, in order to long-term exposure to sunlight safely work. Existing overhead cable insulation material is made of polymer insulation and a certain amount of carbon black blend.   Insulation level   When the overhead cable is used, because the earth voltage is not entirely added to the cable insulation, the air to the ground is mostly borne by the air medium. Therefore, the insulation performance of overhead cable is higher, and it is obviously better than the general ordinary oil paper and XLPE cable.   Inside and outside the semi-conductive shield   1KV low-voltage overhead cable, due to the low electric field strength of the conductor surface, do not need to use the inner semi-conductive shielding layer. When the overhead cable approaches the grounding body, the electric field strength of the 10kV overhead cable conductor surface is 2 ~ 3kV / mm and the electric field strength of the 35kV overhead cable conductor surface can be as high as 5kV / mm, which means that the inner semiconducting layer must be used.

Many people only know about wires, but they known few for different uses of wires. The use of each type of wire is different because it has features that other wires do not have, so let's take a look at what it is before buying a low-smoke, halogen-free flame-retardant wire.   1. Characteristics of low-smoke halogen-free flame-retardant wires--the tensile strength is larger than that of ordinary PVC wires: the tensile strength of general PVC wires is greater than 1.05Kgf/mm2, and the tensile strength of low-smoke halogen-free wires is greater than 1.2Kgf/mm2; 2. Characteristics of low-smoke halogen-free flame-retardant wires - good weatherability (-30 ° C ~ 105 ° C); good softness (hardness 80-90); 3. The characteristics of low-smoke halogen-free flame-retardant wires - non-shifting (because there is no plasticizer added in the formulation of this product, there will be no shape shifting); 4. No toxic black smoke will be produced when burning (a small amount of white smoke will be produced); 5. Has a high volume resistivity: PVC wire is generally 1012 ~ 1015 Ω / cm3, low-smoke halogen-free wire is greater than 1016 Ω / cm3; 6. Has good high pressure resistance: PVC wire is generally resistant to 10KV or more, and low-smoke halogen-free wire is up to 15KV or more; 7. Has good elasticity and viscosity.      

Cables include power cables, control cables, compensation cables, shielded cables, high temperature cables, computer cables, signal cables, coaxial cables, fire-resistant cables, marine cables, mining cables, aluminum alloy cables and so on. They are composed of single or multiple wires and insulating layers, which are used to connect circuits, electrical appliances and so on. According to the system of photovoltaic power station, cables can be divided into DC cables and AC cables. According to the different uses and using environments, cables can be classified as follows: 1. DC cable (1) Series cables between components. (2) Parallel cables between groups of series and between groups of series to DC distribution boxes (shunt boxes). (3) Cable between DC distribution box and inverter. The above cables are all DC cables, which are laid outdoors. They need moisture-proof, sun-proof, cold-proof, heat-proof, ultraviolet-resistant, acid-base-proof and other chemical substances in some special environments. 2. AC cable (1) Connecting cable from inverter to boost transformer. (2) Connecting cable from booster transformer to distribution device. (3) Connecting cables from distribution devices to power grids or users.