Jiangsu Shemar Electric Co., Ltd.

Qing Huang

Jie Yu

Bin Ma

Jiang Fang

Dequan Li

The present disclosure discloses a composite crossarm and a power transmission tower. The composite crossarm includes two post insulators and two suspension insulators. Of the two post insulators and the two suspension insulators, one ends are configured to be connected to a tower body of a power transmission tower, and the other ends are connected together to form an end portion of the composite crossarm to hang a power transmission line. The two suspension insulators are located on same sides of the two post insulators and respectively arranged adjacent to the two post insulators. At the same time, an angle between the two post insulators ranges from 20° to 50°, and an angle between the post insulator and the suspension insulator adjacent thereto ranges from 15° to 45°. The composite crossarm according to the present disclosure is highly stable and convenient to for mounting grading ring.

Composite crossarm and power transmission tower

The present disclosure discloses a composite crossarm and a power transmission tower. The composite crossarm includes a post insulator and three suspension insulators. The post insulator and the suspension insulators each has an end configured to be connected to a tower body of the power transmission tower, and another end connected together to form an end of the composite crossarm that is configured to attach a transmission line. The three suspension insulators are arranged at intervals around the post insulator. Axes of two suspension insulators and an axis of the post insulator are in the same plane. The two suspension insulators whose axes are in the same plane as the axis of the post insulator are defined as first suspension insulators, the remaining suspension insulator is defined as a second suspension insulator. The two first suspension insulators form an angle ranged from 45° to 90°.

An overhead power distribution line () comprises a tension resistant pole (), two composite crossbeams () and tension resistant fixing members (). A middle portion of the composite crossbeam () is horizontally secured on the tension resistant pole (), and end portions of the composite crossbeam () are connected to the tension resistant fixing members (). The tension resistant fixing members () enable the two composite crossbeams () to integrally connect and are for fixing conducting lines. With the above configuration, two composite crossbeams () are secured on the same horizontal plane of the tension resistant pole (), thus satisfying vertical tension of a tension resistant requirement. Further, by using composited crossbeam bodies (), a dry arc distance is significantly increased, and electrical lightning resistance performance is enhanced, preventing incidents such as line disconnection and flashover caused by lightning strike. The composite crossbeams () are maintenance-free and do not require periodical inspection and maintenance, significantly reducing labor costs. The use of crossbeams () can further eliminate the use of tension insulators and simplify the structure of lines.

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Nantong, China

Qing Huang