As an important part of the power communication network, ADSS optical cable assumes important functions such as transmission line monitoring and data transmission. However, ADSS optical cables are exposed to the strong electric field environment of high-voltage transmission lines for a long time, and they are easily affected by corona discharge, electrochemical corrosion and other problems, resulting in aging, fracture and other failures of optical cables. As a protective equipment, the vibration damper corona ring can protect the ADSS optical cable and ensure the safe operation of the cable by optimizing the electric field distribution, suppressing the corona phenomenon, and blocking the corrosion path.
Vibration damper corona ring helps the ADSS optical cable operate safely by optimizing the electric field to suppress corona discharge. ADSS optical cables are usually suspended between the towers of high-voltage transmission lines, maintaining a certain safe distance from the phase line, but in the vicinity of the towers, tension-resistant sections and other parts, the distance between the optical cables and the high-voltage wires is relatively close, and the surrounding electric field distribution is complex and the strength is high. Metal parts such as fittings and joints on the surface of optical cables can easily form a strong local electric field due to their irregular shape. When the electric field strength exceeds the air breakdown threshold, it will cause corona discharge. Active gases such as ozone and nitrogen oxides generated by corona discharge will combine with moisture in the air to form a corrosive electrolyte, which will continue to erode the outer sheath and aramid yarn of the optical cable, resulting in a decrease in the mechanical properties and insulation properties of the optical cable. Vibration damper corona ring adopts an annular metal structure, which is bolted to the optical cable fittings or joints, which can disperse the concentrated electric field strength, make the electric field distribution more uniform, prevent the local field strength from being too high, reduce the occurrence of corona discharge from the source, and cut off the path of corrosive gases.
In specific applications, vibration damper corona ring can form precise protection against the weak links of ADSS optical cables. The tension-resistant clamp, suspension fittings, terminal joints and other parts of the ADSS optical cable are high-incidence areas of corona discharge. Tension-resistant wire clamps are used to fix optical cables. The angular structure used can easily cause electric field concentration. Hanging metal fittings connect optical cables and towers, which can easily become the starting point of discharge in a strong electric field. The metal connectors at the terminal joints are also at risk of corona due to material differences and shape mutations. Vibration damper corona ring wraps these key parts to passivate the sharp edges, making the transition of the electric field from the high-voltage wire to the optical cable fittings smoother.
Vibration damper corona ring also improves the corrosion resistance of ADSS optical cables through environmentally adaptable design. The operating environment of ADSS optical cables is complex and diverse. They face the erosion of high humidity and high salt content in coastal areas, and they will be polluted by dust and acid-base gases in industrial areas. These environmental factors will accelerate the corrosive effects of corona discharge. Vibration damper corona ring is made of corrosion-resistant materials such as aluminum alloy and stainless steel. Some products are also anodized or coated on the surface, which is not easy to rust in harsh environments. In addition, the connection between the vibration damper corona ring and the optical cable fittings is sealed to prevent rain and dust from entering the gap to form an electrolytic cell, blocking the occurrence of electrochemical corrosion conditions. At high altitudes, due to thin air and low air pressure, corona phenomena are more likely to occur. Vibration damper corona ring will adopt a larger diameter ring structure to enhance the electric field dispersion effect and adapt to the protection needs of low-pressure environments.