1. Explanation of the principle of irradiation: Irradiation cross-linking is to use the high-energy electron beam generated by the electron accelerator to bombard the insulating layer and the sheath to break the polymer chain, and each broken point becomes a free radical. Free radicals are unstable and must be recombined with each other. After recombination, … Read more
The degree of crosslinking (hot extension) is unqualified If the degree of cross-linking fails to meet the standard, the thermal-mechanical properties of the aac cable are unqualified and cannot meet the requirement of 90°C working temperature. The reasons for the unqualified cross-linking degree are the unqualified formula and the improper type and ratio of the … Read more
1. Copper and aluminum monofilament drawing Commonly used copper and aluminum rods for wires and cables, at room temperature, use a wire drawing machine to pass through one or several stretch die holes to reduce the cross-section, increase the length, and increase the strength. Wire drawing is the first process of various wire and abc … Read more
1.DC resistivity. The resistivity of copper clad aluminum wire is larger than that of pure copper wire, about 1.5 times that of pure copper wire. When the cathode value is the same, the weight of copper clad aluminum wire is about 1/2 of that of pure copper wire. According to the calculation of the skin … Read more
Because cables are used in many different environments, they look very different in appearance. But regardless of any cable type, they are used as a conductor for signal transmission. These acsr conductor size also have different quality performances in transmitting different signals. Except for some special applications, the cables currently used for audio and video … Read more
Aluminum power cable is a new type of power cable, which is made of AA8030 series aluminum alloy material and adopts the advanced technology such as special roll-forming wire stranding and annealing treatment. The alloy power cable makes up the deficiency of the traditional pure aluminum cable. Although the electric conductivity of the cable has … Read more
The most direct cause of wire and cable aging failure is the breakdown of the insulation due to degradation. There are many factors that lead to the reduction of conductive insulation. According to actual operating experience, it can be summed up as the following situations. 1) Reasons for cable aging: external force damage. Judging from … Read more
Power cable section The selection of power cable conductor cross-section should meet the following requirements: 1 The temperature of the cable bare conductor under the action of the maximum operating current shall not exceed the allowable value of the service life of the cable. Cable conductor work of continuous working loop The temperature should meet … Read more
1 The current and voltage of dual protection, as well as the two systems that need to enhance reliability, such as DC power supply and trip control loop, should use separate control cables. 2 In the following cases, the same control cable should not be used together: 1 Weak current signal, control circuit and strong … Read more
The choice of cable insulation type should meet the following requirements: 1 Under the operating voltage, operating current and its characteristics and environmental conditions, the cable insulation characteristics should not be less than the conventional expected service life. 2 The selection should be based on factors such as operational reliability, ease of construction and maintenance, … Read more