Tag Archives: cable questions

Flexible mineral insulated cable mineral insulated cable can be divided into rigid and flexible according to structure. There are only six types of national standard rigid mineral insulated cables: bttq, bttvq and wd-bttyq with light load of 500V, and bttz, bttvz and wd-bttyz with heavy load of 750V The models of national standard flexible mineral […]

The stranding methods include concentric stranding, compression stranding, profile stranding, bundle stranding, bundle wire re stranding, fan-shaped conductor, separation conductor, ring conductor, stranded conductor in the same direction, etc. The purpose of conductor stranding is to facilitate laying, forming and connection, and consider the influence of proximity effect and skin effect on AC resistance. We […]

Overhead ACSR Cable 477 MCM

October 8, 2021

Overhead ACSR Cable 477 MCM Voltage: Low Voltage/Middle Voltage/ High Voltage Conductor Type: Stranded Conductor: Aluminum Alloy 1350 Origin Place: China         Application: Used as bare overhead transmission cable and as primary and secondary distribution cable .ACSR offers optimal strength for line design. Variable steel core stranding for desired strength without sacrificing […]

On the basis of ensuring safety, the state has formulated certain indicators for wires and cables. Only when relevant indicators are met can they be called national standard wires. As for the allowable long-term working temperature of wires and cables, rubber insulation is usually 65 ℃, PVC insulation is 70 ℃ and cross-linked polyethylene insulation […]

XLPE insulated cable XLPE insulated cable is a kind of cable suitable for distribution network and other fields, which has incomparable advantages over PVC insulated cable. The utility model has the advantages of simple structure, light weight, good heat resistance, strong load capacity, no melting, chemical corrosion resistance and high mechanical strength. Properties of XLPE […]

Overhead cable is the main part of overhead power line. Its function is to transmit current and power. It is divided into overhead conductor and overhead insulated cable. Overhead conductors include AAC conductors, which are commonly used in distribution lines below 35KV; AAAC conductor, commonly used in distribution lines above 110kV; ACSR conductor is widely […]

Both YJV and BVV cables are suitable for outdoor street lighting and are also used to transmit electric energy. However, the models of these two cables are different. What are the differences in voltage, structure, characteristics and purpose? BVV cable: copper core PVC insulated PVC sheathed Du round cable (wire). YJV cable: XLPE insulated PVC […]

We all know that wires and cables are distributed differently according to the structure of electrical conductors. Cables are divided into 1-core, 2-core, 3-core, etc. Single core cable: there is only one electrical conductor in an insulating sleeve. A wide range of main uses are home lighting equipment, power plug, central air conditioning, etc. all […]

1、 Scorch 1. Scorch phenomenon (1) The temperature is too high, or the temperature control instrument fails, causing the plastic to burn at an ultra-high temperature. (2) The glue outlet of the machine head has large smoke, strong pungent smell and crackling sound. (3) Granular scorched matter appears on the plastic surface. (4) There are […]

Power cables have long been widely used in our lives. The safety of their operation is related to our normal life and the safety of life and property. Therefore, the maintenance of cables is a vital work. The following small series will analyze what we need to know about the correct use of power cables. […]

1. External force damage According to the operation analysis in recent years, especially in places with rapid economic development, a considerable number of cable faults are caused by mechanical damage. 2. Insulation damp This situation is also very common. It usually occurs at the cable joint in the directly buried or row pipe. For example, […]

In the announcements of many suppliers of China Netcom, we can often see such a notice from Cable Enterprises: the thickness of insulation layer of power cables produced is unqualified. What is the impact of unqualified thickness of specific insulating layer on the cable? What kind of sheath is qualified? How do we make qualified […]

Shielding layer is a kind of wire with metal braid shell specially used to reduce the influence of external electromagnetic field on power supply or communication line. The shielding wire also has the function of preventing the line from radiating electromagnetic energy to a certain extent. In order to prevent the interference signal from entering […]

The main difference between the two aluminum conductors is the material. AAAC for aluminum alloy strand and ACSR for steel cored aluminum strand. From the outside, the difference is not great. ACSR cable: steel core aluminum stranded wire Steel cored aluminum strand is made of aluminum wire and steel wire, which is suitable for overhead […]

AAC (all aluminum conductor) is also called aluminum strand ACSR: aluminum conductor steel reinforced ABC: overhead bundle cable (with insulation, bundle several together) AAAC: all aluminum alloy conductor AAC / all aluminum conductor These conductors are suitable for spans of wooden poles, transmission towers and other structures that do not require tensile strength and rated […]

The so-called “partial discharge” refers to a kind of discharge in which only some areas in the insulation system discharge without forming a penetrating discharge channel under the action of an electric field. The main reason for partial discharge is that when the dielectric is uneven, the electric field strength borne by each area of […]

Speaking of wires and cables, we have to mention copper and aluminum in their main materials. The question is, what is the difference between copper core and aluminum core wires and cables? Which is better? Let’s get to know~ There are several ways to distinguish whether the wire core is copper core or aluminum core […]

The term ACSR stands for “steel cored aluminum conductor”. It is a stranded conductor, including many aluminum conductor layers on the simulated steel wire core. The steel wire core here is a single steel wire depending on the size. These can be used for different zinc coatings, such as grade A, B and C, to […]

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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