News

A brief introduction to towers

Release Time:

2022-03-31

Pole towers are supports used to support transmission lines in overhead transmission lines. Pole towers are mainly made of steel or reinforced concrete and are the main support structures for overhead transmission lines. A tower is a pole or tower-like structure that supports overhead transmission lines and overhead ground lines and maintains a distance between them and the ground. Pole towers all over the world use steel structure, wood structure and reinforced concrete structure.

Wooden and reinforced concrete pole-like structures are often called poles, and tower-like steel structures and reinforced concrete chimney-like structures are called towers. Pole towers without cables are called self-supporting towers, and towers with cables are called cable towers. China lacks timber resources and does not use wooden poles. But good achievements have been made in the manufacture of reinforced concrete rods and reinforced concrete chimney-shaped spanning towers using the centrifugal principle.

Pole tower is one of the basic equipment in overhead distribution lines. Depending on the material used, they can be divided into three types: wooden poles, cement poles and metal poles. Cement poles have the advantages of long service life and small maintenance workload, and are widely used. The most commonly used cement rod is the toggle rod, and the taper is usually 1/75. It is divided into ordinary reinforced concrete rods and prestressed reinforced concrete rods.

The grounding of transmission line towers is very important for the safe and stable operation of the power system. Reducing the grounding resistance of the tower is the main measure to improve the lightning resistance level of the line and reduce the lightning trip rate of the line. Lightning accidents caused by poor grounding of towers account for a large proportion of the line failure rate. This is mainly due to the fact that when lightning strikes the top of a utility pole or lightning protection line, the lightning current enters the ground through the tower grounding equipment. The ground resistance is too high, resulting in a high counterattack voltage. That said, most poles and towers that are prone to lightning strikes have high grounding resistance. There are many reasons for the high ground resistance of towers, including design reasons, construction reasons, and operation and maintenance reasons. However, external natural conditions, such as high soil resistivity, complex geological conditions and construction inconvenience are the main reasons.

The lightning trip rate of the transmission line is closely related to the grounding resistance of the transmission line tower. The parts with high grounding resistance of transmission line towers are often the parts with complex terrain, inconvenient transportation and high soil resistivity. These places are usually areas of intense lightning. Therefore, it is a very difficult task for us to study the reasons for the high grounding resistance of towers and take effective measures to reduce the grounding resistance of towers.

The company has more than 60 years of production history. It has a provincial-level power transmission and transformation grid engineering technology research center and a provincial-level enterprise technology center;

Henan Dingli Tower Co., Ltd. was recognized as a provincial technology center

On September 9, 2017, the technology center of Henan Dingli Tower Co., Ltd. was jointly recognized as the twenty-first batch of enterprise technology centers in Henan Province by the Henan Provincial Development and Reform Commission, the Department of Science and Technology, the Department of Finance, the State Taxation Bureau, the Local Taxation Bureau, and the Customs.

Congratulations to the official website of Henan Dingli Tower Co., Ltd. officially launched!

The company has large-scale production equipment such as 3,200-ton CNC hydraulic bending machine, flange assembly welding machine, intersecting wire cutting machine, gantry drilling machine, internal welding machine, etc.

Henan Dingli Tower Co., Ltd. achieved excellent results in the Zhumadian Welding Skills Competition

On December 13, the Zhumadian 2Skills Competition017 Skills Competition came to an end. Young welders from Henan Dingli Tower Co., Ltd., Li Yaoqiang, Xu Dongdong, and Zhang Zhuangzhuang won the first and second place (tied) in the city.

Classification of power line towers

Pole towers are divided into the following 7 types according to their purposes:

Strong quality and integrity, Dingli is famous!

On November 6, 2019, Henan Quality Association released the evaluation results of the 2019 "Henan Province Quality Brand" project and the evaluation results of the 2019 "Quality Integrity System AAA-level Enterprise".