Overhead transmission line conductor arc sag is a phenomenon that occurs naturally during transmission line operation.

I. Definition of arc sag of transmission line conductor

An overhead transmission line is a wire suspended in the air by means of towers, enabling the transmission of electrical energy over long distances. Due to the weight of the wire itself, and by the role of tension, the wire between two neighboring towers will show a natural sag shape, this sag is called the wire arc sag.

II. Important impacts on transmission line safety

1. Electrical safety

Proper arc sag can ensure sufficient electrical insulation distance between conductors, between conductors and towers, and between conductors and the ground or other objects. If the arc sag is too large, in wet weather or when there are foreign objects close to the conductor, it is easy to trigger the discharge phenomenon, resulting in line tripping, affecting the stability of power supply. For example, when the conductor arc sag is too large and the distance between the trees is too close, in the rainy weather, the trees may become conductive channels, triggering line short circuits.   

2. Mechanical safety aspects

Reasonable control of arc sag is also critical to the mechanical safety of conductors and towers. Excessive arc sag may cause the tension of the conductor to exceed its design limit, resulting in conductor strand breakage and wire breakage. At the same time, too large an arc sag on the tower will also produce a large tension, may cause the tower tilt, deformation, or even collapse. The arc droop is too small, will make the conductor long-term high tension state, accelerate the fatigue aging of the conductor, will also affect the service life and safety of transmission lines.

III. Reasonable arrangements for online monitoring of wire arc sag

Shenzhen DX-WPS100-HC Transmission Line Arc Sag Online Monitoring Device not only can directly measure the arc sag or distance to ground, but also collect data such as conductor arc sag or distance to ground. strong>Transmission line wire arc sag online monitoring device can not only directly measure the wire arc sag or distance to the ground, but also collect such as wire inclination, temperature, tension, image and other related measurements. These parameters through the corresponding storage and calculation, can be derived from the wire arc angle and distance to the ground state quantity. For example, by measuring the wire inclination angle and known tower spacing and other information, you can use mathematical models to calculate the wire arc sag; combined with the temperature data can analyze the effect of temperature on the arc sag; through the tension measurement can understand the relationship between the conductor force and the arc sag. This multi-parameter measurement and calculation capabilities, so that the monitoring device can fully grasp the status of the conductor.