For decades now, the terminations of oil-filled have been the normal standard for high-voltage cables. However, being deviant from this former technology are being operated by some of the pre-molded dry-type outdoor terminations.
Last 2018, the 138kV are being pre-molded in areas where there is existence of dry-type outdoor terminates. These are being installed across three different regions in the world for the first time ever: Ansonia, Philippines, Malaysia, Connecticut. Each of these countries are having application of mechanical shrink installation technology to their new and existing grids.
In order to meet the increasing demand for some of the regional grid efficiency modernization. The 138kV termination brings about numerous benefits. One of which is the initial termination that being installed in some of the voltage level that utilizes the shrinkage of installation method. The 138kV dry-type outdoor termination constitutes a protection from harsh weather and the termination of this has brought great weather sheds that possibly lock out some of the environmental elements.
With this in mind, the rubber construction greatly offers some great benefits. Having dry-type terminations are 20% to 30% lighter and this allows companies for easier installation. Once the system is fully tested and it has been pre-expanded within the factory, it allows the creation of straightforward installations happening in the field. And it has greatly reduced the potential of having field damage and some devastations installation errors. This no longer contains oils and these terminations brought about avoidance of field damage from having any potential leak that also require maintenance. Because this can bring unexpected power outages.
This brings fewer parts that are needed to be installed and there are no more installation tools required. The weight has been greatly reduced, and this product should effectively and significantly decrease the risk of having field damage, installation time, and dependence on some of the jointers. This happens spontaneously while the improvement of the overall grid efficiency is happening. The flexibility and lightweight of the said equipment allows for the horizontal, vertical, and angled mounting positions. The installation of some of the oil-filled equipment usually requires machinery that are heavy in nature. This drives up some of the labor costs and it shows some limits in installation options due to the fact that the proximity to the energized overhead lines.
The installation of pre-molded dry type shows greater demand whereas the new grids are being currently developed while the level of electrification is now low. In some of the developing countries it is easier and cost-effective option.
While there is a transition happening in the U.S. is slower, the installation in systems such as Ansonia should be the start of the beginning for the utilization of Americans and move toward the dry-type single-piece pre-molded outdoor termination. Together with the shrinkage mechanical installation method in improving the grid efficiency.