Regardless of high and low voltage lines as well as automatic blocking overhead lines, there are mainly the following structural categorization: linear pole, spanning pole, tension rod, terminal pole and so on.

The common pole structure classification:
(A) straight line pole - also called intermediate pole. Set up in a straight line, the pole before and after the wire for the same type and the number of equal along the wire on both sides of the tension is equal, only in the line breaks to withstand the unbalanced tension on both sides.
(B) tension rod - line may occur in the operation of broken line faults and make the tower to withstand tension, in order to prevent the expansion of the fault, must be installed in a certain location with greater mechanical strength, able to withstand the tension of the tower, this tower is called tension rod. Tension rod set up in the direction of the line, so that you can prevent the breakage of the line, the fault spreads to the entire line up, and only the tension imbalance is limited to the state between the two tension rod. The distance between the two tensioning rod called tensioning section or tensioning gear distance, long power lines generally provide 1 kilometer for a tensioning section, but also according to the operating conditions to be appropriate to extend or shorten. In the number of wires and the cross-section of the place has changed, but also to use the tensioning rod.
(C) corner pole a change in the direction of the overhead line for the premises, the corner pole can be tension-resistant, can also be linear, according to the tower loaded with tension wire.
(D) terminal pole - an overhead line for the beginning and end, because the terminal pole only one side of the conductor, under normal circumstances also have to withstand the tension, so to install the cable.
Conductor type: steel-core aluminum stranded wire has sufficient mechanical strength, good electrical conductivity, light weight, low price, corrosion resistance, is widely used in high-voltage overhead power lines.
The minimum cross-section of the conductor is not less than 50mm² for self-closed lines and 50mm² for through lines.
Line pitch: the choice of pitch is appropriate to take the plains residential areas 60-80m, non-residential areas 65-90m, but also according to the actual situation on site.
Conductor transposition: the conductor should adopt the whole section transposition, every 3-4km transposition, each interval to establish a transposition cycle, after the transposition cycle, before the introduction of the substation should be maintained in the introduction of the two neighboring distribution of the same phase line. Role: to prevent interference with nearby communication open lines and signal lines; to prevent excessive voltage.

Classification of overhead power lines, whether high-voltage lines, low-voltage lines or automatic truncation lines, can be divided into the following types: straight poles, horizontal poles, tie poles and terminal poles.
1. Classification of common electric pole structures
One kind. Straight pole: Also known as center pole, installed on a straight section, when the type and number of conductors are the same, the tension on both sides of the pole is equal. It only withstands the unbalanced tension on both sides when the conductor breaks.
It is installed on a straight section when the conductors are of the same type and number. b. Tension Resistant Poles: When a line is disconnected, the line may be subjected to tensile forces. In order to prevent the spread of faults, it is necessary to install rods with high mechanical strength and capable of withstanding tension at specific locations, called tension bars. Tension rods are provided with tension lines along the line to prevent the spread of faults and to limit the tension imbalance between two tension rods. The distance between two tension rods is called the tension section or tension span, which is usually set at 1 km for longer power lines, but can be adjusted according to operating conditions. Tension rods are also used where the number and cross-section of conductors vary.
c. Angle rods: Used as a change of direction point for overhead power lines. Angle poles may be tensioned or leveled. Installation of tension lines depends on the stress of the pole.
d. Termination Posts: Used at the beginning and end points of an overhead power line. Normally, one side of the terminal post is under tension and is equipped with a tension wire.
Conductor Type: Aluminum core stranded wire (ACSR) is widely used in high voltage overhead power lines because of its adequate mechanical strength, good electrical conductivity, light weight, low cost and corrosion resistance. For 10 kV overhead lines, conductors are categorized into bare conductors and insulated conductors. Insulated conductors are generally used in forested areas and places with insufficient ground clearance.
Conductor cross-section: Steel-core aluminum stranded wires with a minimum cross-section of not less than 50mm² are usually used for self-closing lines and through lines.
Line distance: The distance between lines in flat residential areas is 60-80m, and the distance between lines in non-residential areas is 65-90m, which can be adjusted according to the actual situation on site.
Reversal of conductor: The conductor should be completely reversed every 3-4 kilometers, and a reversal cycle should be established for each section. After the commutation cycle, the phase of the neighboring substation feeder should be the same as the phase before the introduction of the substation. This is to prevent interference with nearby communication and signaling lines and to prevent overvoltage.