In this article by Arian Abhar wire and cable, explanations are given about three-phase electric cable.
Three-phase power cable
They are called cables that can be connected to three-phase electricity. These cables can be found in the market in the form of single strands to five strands. Three-phase cables are used in commercial and industrial projects in order to turn on high-consumption devices. These cables are also used in some residential buildings.
Considering that three-phase power cables are considered as one of the most important means of electric current transmission, it is necessary to use the high-quality type in order to prevent possible damages. Since these cables have different types, we will discuss them more in this topic.
Types of three-phase power cables
There are different types of three-phase electric cable based on thickness, voltage, number of strands and type of insulation, which are introduced in this section.
we do. Power cables are classified according to the type of conduction in the following categories:
Copper three-phase power cable
Wired power cable
Lightning cable
Armored power cable
Aluminum three-phase power cable
Also, three-phase power cables are divided into the following categories based on the number of strands:
Single strand three-phase power cable: It has one phase strand with 380 V current support.
Three-phase three-wire electric cable: three phase wires are placed inside the insulation.
Three-phase power cable, three and a half strands: three phase strands with one neutral strand
Three-phase, four-strand power cable
Three-phase power cable has five strands: three phase strands with one neutral strand and one earth wire strand.
Types of three-phase power cables
How to connect a three-phase cable
In order to get acquainted with the three-phase power cable connection, it is necessary to find enough information about its components. The three-phase cable system is connected with 3 types of triangle, star and mixed connections. The most important difference between star and triangle connection is in their neutral wire. In the star system, the neutral wire is used, and in the triangle system, the neutral wire is not used.
Also, these two are different in engine speed. In the star connection, the motor speed is low and in the delta connection, the speed is higher. Important tools are used in three-phase electricity connection, including a three-phase electricity meter, single-pole and two-pole switch, miniature fuse, power distribution board, copper bus, compact switch, etc.
How to connect a three-phase cable
How many strands does a three-phase cable have?
Three-phase cables consist of four strands of wire. These wires include phase 1, phase 2, phase 3, zero and earth wire. The three phase wires used in this cable have a current of 380 volts. In order to connect the phases correctly, each one has different colors.
What is the structure of the three-phase power cable?
The three-phase cable, like any other cable, consists of a conductor along with insulation and coating; Therefore, any cable that has these three characteristics can be called a three-phase power cable. But provided that it can support 380 V current. In addition, in the structure of some three-phase cables, there are two other types of zero or earth strings besides the phase. The higher the number of strands, the higher the quality of the cable. However, it will increase the price of three-phase electric cable. The method of connecting the three-phase cable is based on the type of operation, one of the two methods is triangular and star.
Expert examination of three-phase electric cable
Three-phase cable is a cable used for three-phase power connections. In other words, for three-phase electricity, we need cables and wires that can support 380 volts and above. One of these types of cables is a three-phase cable. There are different types of three-phase electric cable with different number of wires and different sheaths, which are used to connect devices and devices with three-phase electricity. In the following, we will first examine the structure of this type of electric cable and its types.
What is the difference between three-phase and single-phase electricity?
Single-phase electricity is called an AC sinusoidal alternating current, which usually consists of two phase and neutral wires. If three-phase electricity establishes the same current in three or four wires. In three-phase electric wires, there is a 120-degree phase difference between the wires. Although the most common type of electricity in home use is single-phase and three-phase electricity is mostly used in factories and high-power electronic equipment, but its advantages have caused it to replace single-phase in most cases. The most important ones are:
Advantages of three-phase electricity over single-phase electricity
• The possibility of replacing three phases instead of three single-phase sources
• Uniformity and balance of instantaneous power in three-phase electricity
• Better energy transmission at high voltages in three-phase electricity
• Three phase 380 V in three phases versus 220 V single phase
• Cost-effectiveness
• Less wire connection
Standard coloring in three-phase electric cable
In order to connect the phases correctly and faster and accurately identify the strands, according to a specific standard, each wire is the same color. The most famous and most reliable standard in the three-phase power cable is the IEC standard, in which the R phase is red, the S phase is yellow, and the T phase is blue. Another type of common standard in Iran is the Chinese standard. Because the use of Chinese three-phase power cable is popular. In this standard, the colors of the phases are yellow, green and red.
Conclusion
Abhar’s large wire and cable collection designs and mass-produces this cable, which is one of the most widely used electrical cables, and its application is when high-voltage electricity is transmitted. In order to be able to connect three-phase power, cables and wires are needed that are capable of supporting high-voltage current. There are different types of three-phase power cables, the number of wires and their sheaths are different from each other. Therefore, different wires should be used for different devices.
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