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Solutions to Electrical Corrosion of ADSS Optical Cable


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1. Reasonable selection of ADSS cable and hardware


The anti-tracking AT outer sheath is widely used in practice, using non-polar polymer material as the base material, and the tracking-resistant PE outer sheath material also has good performance, and should be reasonably selected according to actual needs.


These materials use inorganic fillers, which can effectively isolate carbon black particles and prevent large leakage currents. The application of the tracking-resistant PE outer sheath material also improves the heat resistance of the outer sheath and prevents the damage caused by the rise of the dry-band arc.


While improving the anti-tracking performance of ADSS optical cables , such materials can avoid negative effects on other properties, so the practical application effect is better. If the content of inorganic compound materials is increased to about 50%, the tracking resistance can be further improved, but other properties will also be affected.


2. Optimize the hanging point of ADSS cable


The reasonable selection of the optical cable hanging point can reduce the probability of electrical corrosion and enhance the operation quality of the power communication network. The circuit should be planned scientifically, and the distribution characteristics and intensity of the induced electric field should be comprehensively obtained and evaluated, so as to ensure the scientificity and feasibility of the hanging point position and reduce the impact on the ADSS optical cable.


Specifically, on the basis of calculating the induced electric field, the hanging point position that can reduce the occurrence of electrical corrosion of the optical cable is selected. If the discharge traces mostly appear in the end of the metal fittings, you can use the anti-vibration hammer instead of the anti-vibration whip to avoid the corona caused by the end of the anti-vibration whip and the end of the twisted wire becoming the discharge electrode, and make a reasonable adjustment of the hanging point.


3. Protect the surface of ADSS optical cable


Strengthening the effective protection of ADSS optical cables to prevent serious wear problems during construction can also play a good role in prevention and control. The appearance of ADSS fiber optic cables should be thoroughly inspected to prevent galvanic corrosion during operation due to contamination.


Especially in the event of rupture and severe wear, water and dirt will accumulate under the action of external weather, and the resistance value will drop, causing the induced current to rise, shortening the service life of the ADSS optical cable.


A comprehensive survey of the construction environment should be done, the distribution characteristics of surrounding objects such as towers, branches, buildings, and spans should be clarified, and a reasonable specification of the ADSS optical cable layout should be done to prevent serious damage. Check the quality of the protective sleeve, strengthen the protection of the optical cable, and enhance its anti-tracking performance.


4. ADSS optical cable controls pre-twisted wire and shockproof distance


When installing ADSS optical cable in the line, the distance between the pre-twisted wire and the anti-vibration whip should also be reasonably controlled, which is also the main measure to prevent electrical corrosion problems.


Especially in order to meet the electrical work requirements, it will cause the span to exceed the standard value, and at the same time, the optical cable will vibrate under the influence of the outside windy weather.


Different numbers of anti-vibration whips should be used according to different span values. When the span is 250~500m and 100~250m respectively, 2 pairs of anti-vibration whips and one pair of anti-vibration whips can play a good anti-vibration effect. If it exceeds 500m, you can add another pair of shock-proof whips.


Under the traditional design system, the distance between the anti-vibration whip and the pre-twisted wire cannot be controlled, resulting in the discharge being caused by the distance. Therefore, the distance between the two should be controlled at about 1m to reduce or eliminate the problem of corona discharge. In the construction, the anti-vibration whip should be handled with the help of special tools to prevent the anti-vibration whip gradually approaching the pre-twisted wire due to improper handling.


In addition, the application of insulating paint can also improve such problems. In practice, silicone insulating paint is often used to enhance the insulation performance of optical cables, so that pollution flashover and corona problems can be controlled.


5. The ADSS cable is set with a corona ring


The anti-vibration whip and the end of the pre-twisted wire have a certain roughness, which is the key factor in causing corona discharge, and it is difficult to ensure the good uniformity of the electric field, which accelerates the electrical corrosion of the ADSS optical cable.


Therefore, it can be processed by means of the discharge halo, so that the phenomenon of tip discharge can be effectively controlled. The value of the corona initiation voltage is significantly improved, so the occurrence of corona discharge can be controlled.


When setting the anti-vibration whip and pre-twisted wire in the ADSS optical cable, the relevant operating standards and specifications should be strictly followed, and a discharge halo should be reasonably set at the end of the pre-twisted wire to prevent the optical cable from touching and affecting its performance.