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• Time of issue:2021-06-28
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【概要】Causes of errors in the vertical and horizontal installation of the cross arm

Mainly consider the vertical and horizontal installation errors of the cross arm: After the wire is assembled, the horizontal diagonal twisting error will add harmful external force to the cross arm, pole, and insulation layer; the influence of the sag error perpendicular to the span: each phase line of the span sags The difference between the degrees must be less than 50mm. When the vertical tilt error of the cross arm exceeds 25 mm, the difference between the lowest points of the wire will increase, the risk of sagging or even mixing will increase, and the sagging requirements cannot be met. The wrong request should be restricted.

　　The cross arm is usually installed at a distance of 300 mm from the top of the pole. A single cross arm must be installed on the receiving side to facilitate identification of the power supply side during maintenance or overhaul. The 90o angle pole, terminal pole and branch pole single-mode arm must be installed on the cable side, and the cross arm support iron must be installed on the side facing the power receiving side. on the left. In addition, the integrated installation process forms a regular process for future maintenance and inspection work, avoiding the omission of inspection items and making it easy to find defects.