Our company has experience in both design studies and constructions for more than ten (10) years while the continuous training of our staff in combination with the continuous investments in modern equipment have put us in the first places among the top companies in construction and design study in electricity transmission projects nationwide. After all, it is no coincidence that the largest companies in the field trust us with the implementation of their investments. Our satisfied customers are the best guarantee of the quality of our work.
Our company in 2020 invested first in Greece in a flying topographic equipment by using drone. LIDAR miniVUX-2UAV revolutionized the way the ground is mapped. There are no more limits to where the survey can be performed. From the deepest gorges to the highest mountains, LIDAR miniVUX-2UAV can measure with millimeter accuracy.
The transmission system transfers electrical power from the power plants to the transmission substations. The power is transmitted through the 150KV High Voltage system and through the 400KV Extra High Voltage system, to reduce power losses when the distances are long. The 150 KV High and 400 KV Extra High Voltage transmission lines cannot directly supply consumers that are using 220/380 V low Voltage, but is reaching certain points, the transmission substations, where the voltage is stepped down to 20 KV medium voltage. Substations are nodes in the power distribution network. From the transmission substations are the power distribution lines start and end at the distribution substations where the medium voltage is stepped down once again to low voltage that is used by most consumers.
The design and settings of a power transmission line depends on several factors. The length of the line depends on the connection rules, foreseen by the grid control code issued by IPTO and will indicate how the new transmission line is interconnected to the grid. Overhead transmission lines are the simplest and cheapest way to transport electrical power in the country. The basic configuration of the pylons depends on voltage, power, number of circuits, arrangement of conductors, available space, atmospheric conditions, mechanical loads, and movement of conductors under the influence of different territorial conditions. However, in cases of remote islands or river crossings, the transmission line is going through underground or underwater conductors. For their construction, special terminals and cables are required and for this reason their construction cost is more expensive compared to an overhead line, while the underwater lines are mainly used for the interconnection of islands with the national grid. Underwater special cables are used for their construction, increasing their construction and installation costs.
High and extra high voltage power transmission lines must comply with guidelines that set the specifications for full lightning protection. This is achieved by placing a continuous conductor at the top of the pylons where the line begins to the final connection. Ground rods are also installed in pylons during their construction. After the work is completed, test are performed to measure the grounding resistance. If the measurements indicate that the resistance is high then ground rings are installed so that the resistance is reduced to the desired levels.
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