Tag Archives: cable questions

Basic structure The basic structure of power cable consists of core (conductor), insulating layer, shielding layer and protective layer. (1) Core The core is the conductive part of power cable, which is used to transmit electric energy and is the main part of power cable. (2) Insulating layer The insulation layer is to separate the […]

The original design capacity of transmission lines in many areas can not meet the actual demand. In order to save the cost, some users directly connect a cable with the same specification and section on the original transmission line to meet the actual demand of power consumption. Theoretically, when two cables of the same specification […]

The Basic Structure of Power Cables The conductor is extruded and covered with an insulating layer, such as an overhead insulated cable, or several-core stranded (corresponding to the phase, neutral and ground wires of the power system), such as an overhead insulated cable with more than two cores, or an additional sheath, such as plastic/ […]

In the stringing construction of 66kV and above transmission lines, it is often encountered that some conductors are worn due to various reasons in the construction, which need to be handled, which is inconvenient for the construction. According to the previous construction experience of transmission line stringing, the following research and methods of conductor abrasion […]

Power cable is the backbone of power system, which is used to transmit and distribute large-scale electric energy. The rated voltage is generally 0.6/1kv and above. The control cable directly transmits the electric energy to the power supply connection of various electrical equipment and appliances, and its rated voltage is 450 / 750V. This makes […]

Wire electric energy, information, and wire products that realize the conversion of electromagnetic energy; in order to facilitate selection and improve applicability, my country’s wire and electricity can be divided into the following five categories according to their uses: 1) Bare wires: refer to products with only conductors and no insulation layer, including copper, aluminum […]

When choosing the cable, choose the cable according to the use of the site, don’t covet cheap. Think that the cable price is cheap and can ensure that it is the national standard, nine out of ten are playing edge ball. Cheat the users who are not professional and don’t understand the industry. The quality […]

Main technical requirements 1. Two core cable should be used in DC power supply circuit, and single core cable can be used when necessary. 2. PVC insulated cables should not be used in places with high temperature above 100 ℃ or low temperature below – 20 ℃. 3. When the cable is directly buried, when […]

In the actual parallel operation of cables, single core cables are more in parallel. Due to the influence of laying mode, the actual carrying capacity of single core cables may not meet the needs of actual loads, and overload may occur in actual use. In fact, when six cables are laid in the air in […]

The operation quality, safety and reliability of power supply system are not only related to the quality of wires and cables, but also to the construction quality of cable accessories and lines. 1. Cable laying method The cable laying methods are as follows: directly buried laying, pipe laying, shallow trench laying, cable trench laying, cable […]

1. What should be paid attention to in the process of cable loading and unloading? Answer: In the process of transportation and loading and unloading, the power cables and cable trays shall not be damaged. It is strictly prohibited to push the cable trays directly from the vehicle. Cables should not be transported and stored […]

1. Why is it necessary to install a return line parallel to the cable in the single-core cable jacket earthing mode? Answer: In the cable line that is earthed at one end of metallic sheathing, to make sure the inductive voltage in protecting a jacket does not exceed permitted standard, must install the conductor that […]

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