According to the nature of electricity consumption, what can be divided into power lines

According to the nature of electricity, power lines can be divided into power lines and lighting lines. The electrical appliance should be unplugged after use; Do not pull the wire when plugging and unplugging the power plug to prevent electric shock caused by damage to the insulation layer of the wire; The insulating skin of the wire is peeling off, and the new wire should be replaced in time or wrapped with insulating tape.

Power lines are divided into high and low voltage lines according to voltage, and there are high-voltage lines and low-voltage lines. High-voltage lines refer to power lines with a voltage of 1kV and above, and low-voltage lines refer to power lines below 1kV. There are also power lines from 1kV to 10kV or 35kV called medium-voltage lines, power lines above 35kV to 110kV or 220kV are called high-voltage lines, and power lines above 220kV or 330kV are called ultra-high-voltage lines.

Power lines are divided into overhead lines according to their structural form.

cable lines and indoor lines, etc.

The basic requirements of power lines: safe and reliable power supply, convenient operation, flexible operation, economy and conducive to development.

Power lines and lighting lines.

Overhead lines are mainly composed of conductors, lightning cables (i.e., overhead ground wires), towers, insulators and fittings.

The pole and the cross arm are assembled together, and its function is to support the insulator to erect the wire, and ensure that the wire is to the ground and there is enough distance between the wire and the wire. The iron cross arm has high mechanical strength and is widely used. The porcelain cross arm has the function of both a cross arm and an insulator, but the mechanical strength is low, and it is generally only used for overhead lines with smaller cross-section wires.

Power Circuits Lighting circuits.

Transmission lines and distribution lines.

Transmission lines and cable lines?

Power lines and lighting lines.

See page 107 of the 2016 revised edition of Low Voltage Electrical Engineering.

It should be power lines and lighting lines.

Is it a transmission line and a distribution line?

(1) Overhead power lines.

Erect the wires on a pole outside the tower. Low cost, economical, easy to install, easy to erect and maintain, easy to maintain and overhaul, easy to find and troubleshoot. But the reliability is poor.

2) Cable routes.

It is generally buried in underground cable trenches or pipes. The cost is high, the maintenance is time-consuming, but it occupies a small area, the power supply reliability is high, it is not easy to be damaged by external forces, it is safer for people, and it does not affect the beauty of the environment.

According to the line voltage level and user object, power lines can be divided into distribution lines and transmission lines.

Distribution line refers to the line that sends electricity from the step-down substation to the distribution transformer or the power from the distribution substation to the power consumption unit. The voltage of the distribution line is called the high-voltage distribution line; The distribution voltage does not exceed 1kV, the frequency does not exceed 1000Hz, and the DC does not exceed 1500V, which is called a low-voltage distribution line. The construction of distribution lines requires safety and reliability, maintaining the continuity of power supply, reducing line losses, improving transmission efficiency, and ensuring good power quality.

The task of the transmission line is to transmit electric energy, and to contact the power plants, substations (institutes) to make them run in parallel, to realize the power system networking, and to realize the power transfer between the power systems. High-voltage transmission lines are the main arteries of the power industry and an important part of the power system.

The voltage levels of China's transmission lines are: 35kv, 66kv, 110kv, (154kv), 220kv, 330kv, 500kv, 750kv, 800kv, 1000kv; The electric energy produced by the power plant is transmitted to the power system through the step-up transformer, and the power line of the step-down transformer and the high-voltage power line of 35kV and above of the power consumption unit are called transmission lines.

1.According to the laying method, it is divided into overhead lines.

Cable lines, pipe lines, etc.

2.According to the insulation properties of conductors, they are divided into plastic edge wires, rubber insulated wires, bare wires, etc.

3.According to the use, it can be divided into power lines (transmission of electric energy) and control lines (protection and measurement connections).

According to the voltage level, it is divided into high voltage and low voltage, according to the type, it is divided into overhead and cable, and according to the power supply, it is divided into DC and AC. There are other ways to classify them, but I won't list them all.

Power lines are generally divided into two categories: (transmission lines) and (distribution lines).