PIC DE GOMÀ ANALYSIS

TELECOMMUNICATIONS TOWER OF PIC DE GOMÀ

WESTERN PYRENEES

Introduction

  • The PIC DE GOMÀ Tower is located in an area with a high incidence of lightning (area with Ceraúnico level (Nc) of 7.5). It is owned by Andorra Telecom and is located in the Ordino area (Principality of Andorra, Western Pyrenees)
  • Before the installation of the DDCE100 (on May 1, 2015), ANDORRA TELECOM informs us that there have been direct impacts on the tower with significant electrical damage.

Conclusions

  • In the period between May 1, 2015 and December 31, 2016, when there was an installation of a lightning rod type DDCE100, there was NO impact of direct lightning on the tower, nor within 100 m radius of coverage (Table 1)
  • In 1 year and 7 months of study (01/05/2015 – 12/31/2016) there have been 504 lightning impacts in 3 km around the TOWER.
  • The closest impact has been more than 300 meters (recorded last day 07/31/2015 at 5:46:08 PM of 30.8 KA (Positive). All impacts have occurred more than 100 meters of the tower
  • By distance segments the results tell us that 0.39% of impacts occur at distances between 100 m and less than 300 m from the TOWER, 1.78% of impacts occur at distances between 300 m and less than 500 m, 7.14% of impacts occur at distances between 500 m and 900 m and 90.07% of impacts occur at distances greater than 900 m (table 1)
  • It can be observed that although the average intensity of negative rays is over 10 KA and that of positive rays is over 20 KA, there are several impacts of significant intensities, such as that recorded on June 7, 2015 at 17:04:23 h from 109,100 A (Negative) at 2,4 Km from the tower and on July 12, 2016 at 7:21:30 h from 53,300 A (Positive) at 2,7 Km from the tower. This makes us think that an electrical installation should be protected with potential lightning impacts of these intensities.

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  • It is demonstrated that the DDCE compensates for the variable electric field in its surroundings, preventing the rising tracer from forming and, therefore, a direct lightning strike. The real data prove that the risk of lightning impact increases as the storm moves away from the point where the DDCE is placed, which is logical, since the DDCE will compensate the electric field in its environment and it will increase again as that moves away from the DDCE.
  • Therefore the EFFECTIVENESS OF the DDCE in this study (Torre PIC DE GOMÀ) of 1 year and 7 months, in an area with a high incidence of lightning (Ng = 7.5), is 100% on direct lightning impacts in the structure that protects and 100% on impacts within the area of ​​its coverage radius of 100 meters,
  • The DDCE only has influence on the electric field that appears in its surroundings. It has NO influence on what happens in the cloud, nor on the number of storms that appear in the area nor the time in it, as is logical.

Captura de pantalla 2018-12-16 a las 21.46.31

Table 1.- Probability of lightning impact in the period between May 1, 2015 and December 31, 2016, 3 km around the TORRE PIC DE GOMÀ