opper is a transition metal with an atomic number of 29, a density of 8.92g/cm3, and a melting point of 1083.4. It has good thermal and electrical conductivity, so it is widely used as ACSR conductor. However, in humid air, the surface of copper chemically reacts with oxygen to form Cu2(OH)2CO3, which is patina. Usually, … Read more
1.The insulation has deteriorated due to aging. The insulation of power cables is subject to thermal, chemical and mechanical actions that are accompanied by electrical action, so that physical and chemical changes occur in the insulating medium, and the insulation level of the medium is reduced. The insulation is damp. Intermediate joints or terminal heads … Read more
In the actual parallel use of cables, there are many single-core cables in parallel. During the actual parallel use of single-core PE Cables, due to the influence of the laying method, the actual current carrying capacity may not meet the actual load needs, and it may appear in actual use. Overload phenomenon. In fact, when … Read more
Due to changes in the environment in which Power Cables are laid and the application of new materials for cables and their accessories in the cables, it is increasingly difficult to locate faults on the power cable site. The difficulty of field cable fault location is mainly reflected in the fault location of directly buried power … Read more
Power cables have become a necessity in human life and production, and play an important role in many fields and industries, including home appliances, automobiles, houses, engineering, transportation, and so on. The demand for high-voltage power cables has been increasing in recent years, and cable companies have also entered the market. The main technology for … Read more
Fiber heating cables have been used more and more frequently in recent years, and the occasions for use are also expanding. For example, underfloor heating was only popularized in the north in the past, but with the change of concept, more and more southerners are also laying underfloor heating in general. In addition, with the … Read more
In daily life, many people will see high-voltage power cables in the suburbs. They are often erected in mid-air, but many people may not observe carefully. Many of the high-voltage wires that are erected in the air are bare wires. The so-called bare wires are not insulated. The cable of the skin. Usually the wires … Read more
During the operation of the wire and cable, heat will be generated due to the existence of resistance. The resistance of the wire is generally very small, and its heating power can be expressed by the formula q=I^2R. q=I^2R indicates: for a piece of Power Cable in actual use (R is basically constant), the larger … Read more
ThePower Cable industry is an industrial basic industry, and its products are widely used in energy, transportation, communications, automobiles, petrochemicals and other fields, occupying an extremely important position in my country’s national economy, and the market demand is huge. Since the 21st century, China’s economy has continued to grow at a high speed. In particular, large-scale … Read more
1. Select the cross section according to the temperature rise of the core When the load current is passed, the core temperature does not exceed the long-term working temperature allowed by the cable insulation. That is to say, select according to the allowable current-carrying capacity. Suggestion: The cable passes through different heat dissipation conditions. The … Read more