1. Page 1 of 8 1. The purpose of this report is to study the effectiveness of the DDCE device against downloads direct lightning, in a telecommunications tower of the company ABERTIS TELECOM, located in the area of Masella (area of Eastern Pyrenees). The study is based on data provided by the company MÉTÉORAGE, a subsidiary of the FRENCH National Meteorological Institute. The system used is Remote Sensing by triangulation of the lightning signal, with a tolerance of +/- 50 meters. The tracking radio is 2 km around the telecommunications tower. In the case of the period from June 1, 2014 to December 1, 2015, the monitoring radius is 3 km. Installation date of the DDCE lightning rod: JUNE 1, 2014 In principle, the telecommunications tower has suffered Impacts direct rays before the date of installation of the DDCE. 2. DATA PROVIDED BY METEORAGE The data provided in the reports of MÉTÉORAGE (htpp: // www.meteorage.fr. /) Are the following: • Id: number of the impact in the list of the report. • Date: impact date with Day / Month / Year format. hour of impact with hh / mm / ss format, indicated in local time (MET) or in UTC (add + 1 for local time in winter) (add + 2 for local time in summer).
2. Page 2 of 8 • lat. : latitude of the impact in decimal degrees. • Long .: impact length in decimal degrees. • amperage. (cloud-soil): polarity and peak intensity of the discharge current in kiloamperes (1 kA = 1000 A). • gd-ax: semi-major axis of the confidence ellipsis of the location in km. (maxis) • pt-ax: semi-minor axis of the confidence ellipsis of the location in km. (maxis) • Incline: inclination in degrees of the ellipsis with respect to the North. • Distance: distance in kilometers between the point of impact and the city of reference or the coordinates used. • dir. (azimuth): angular direction of the point of impact with respect to the geographical North (in degrees, clockwise), as seen from the center of the study.
3. Page 3 of 8 STUDY OF RAYS IN THE TORRE DE LA MASELLA (DATA PROVIDED BY METEORAGE) CONCEPT TOWER OF TELECOMMUNICATIONS PROTECTED AGAINST THE RAY WITH THE DDCE100 June 2014 – June 2015 July 2015 August 2015 September 2015 October 2015 TOTAL RAYS 2 Km. round 191 22 59 19 8 DAYS OF ELECTRICAL STORMS WITH RAYS IMPACTS IN THE STUDY AREA 28 5 4 2 2 POSITIVE RAYS 15 1 1 3 2 NEGATIVE RAYS 176 0 23 4 3 RAYS BETWEEN CLOUDS – 21 35 12 3 DIRECT IMPACTS ON THE TOWER 0 0 0 0 0 IMPACTS LESS THAN 100 m FROM THE TOWER (
4. Page 4 of 8 LIKELIHOOD OF LIGHTNING IMPACT BASED ON DISTANCE TO THE TELECOMMUNICATION TOWER AND TOTAL AMOUNT IN KILOAMPERIOS FALLS AROUND THE TELECOMMUNICATION TOWER (3 Km in the period of June 2014 – June 2015 and 2 Km in the rest of months) TELECOMMUNICATION TOWER CONCEPT PROTECTED AGAINST THE RAY WITH DDCE100 June 2014 – June 2015 July 2015 August 2015 September 2015 October 2015 IMPACT ON THE TOWER (0 m) 0% 0% 0% 0% 0% IMPACTS UNLESS 100 m FROM THE TOWER (
5. Page 5 of 8 Photo 1. METEORAGE report (Google Earth Image) of lightning impacts of August 22, 2015, where 41 lightning impacts were recorded in 2 km around the tower. The closest impact was more than 100 meters and was negative and 10.9 KA. Specifically between 100 and 300 meters, there were 2, between 300 and 500 m, 1 was recorded, between 500 and 900 m, 8 were recorded and more than 900 m, 30 were recorded PROBABILITY OF RAY IMPACT DISTANCE TO THE TOWER FROM AUGUST 22, 2015 CONCEPT IMPACT PROBABILITY OF RAY IMPACT ON THE TOWER (0 m) 0% IMPACTS LESS THAN 100 M FROM THE TOWER (
6. Page 6 of 8 Photo 2. METEORAGE report of lightning impacts in the period from June 1, 2014 to July 8, 2015, where 191 lightning impacts were registered in 3 km around the tower. The closest impact was more than 200 meters and was negative and 5 KA. Specifically between 100 and 300 meters, there were 1, between 300 and 500 m, 4 were recorded, between 500 and 900 m, 19 were recorded and more than 900 m, 167 were recorded PROBABILITY OF RAY IMPACT DISTANCE TO THE TOWER IN THE PERIOD INCLUDED BETWEEN THE DAY 1 JUNE 2014 AND THE DAY 8 JULY 2015 CONCEPT IMPACT PROBABILITY OF RAY IMPACT ON THE TOWER (0 m) 0% IMPACTS LESS THAN 100 M FROM THE TOWER (
7. Page 7 of 8 CONCLUSIONS 1. The Tower Object of study is located in an area with a high incidence of lightning (area with a ray density level (Ng) of 6). 2. Before the installation of the DDCE100 (on June 1, 2014), ABERTIS TELECOM informs us that there have been direct impacts on the tower with electrical damage of more or less importance 3. In the period between June 1 from 2014 to today (October 21, 2015), when there was an installation of a lightning conductor type DDCE100, there was NO impact of direct lightning on the tower, nor within 100 m of coverage radius 4. In the year and 5 months of study (06/01/2014 – 20/10/2015) 299 lightning impacts have been registered in 2 and 3 Km. Around the TOWER, with the following results: CONCEPT June 1, 2014 to October 20 2015 PROBABILITY OF RAYS IMPACT TOTAL RAYS 2 and 3 km around 299 – DAYS OF ELECTRIC STORMS WITH RAYS IMPACTS IN STUDY AREA 41 – POSITIVE RAYS 22 – NEGATIVE RAYS 206 – RAYS BETWEEN CLOUDS 71 – DIRECT IMPACTS ON THE TOWER 0 0% IMPACTS LESS THAN 100 m FROM THE TOWER ( 900 m) 247 82,60% MAXIMUM NEGATIVE RAY STRENGTH 79,9 KA (06/11/2014) at 2,2 Km from the tower – MAXIMUM POSITIVE RAY INTENSITY 95 KA (07/28/2014) at 1,5 Km from the tower –
8. Page 8 of 8
a) ZERO DIRECT IMPACTS
b) The closest impact has been more than 100 meters (recorded last day 08/22/2015 at 16:33:19 h of 10.9 KA (Negative) All impacts have been produced more than 100 meters from the TOWER
c) By distance segments the results tell us that 2% of impacts occur at distances between 100 m and 300 m from the TOWER, 2% of impacts occur at distances between 300 m and 500 m, 13.37% of impacts occur at distances between 500 m and 900 m and 82.6% of impacts occur at distances greater than 900 m
d) It can be seen that although the average intensity of negative rays is about 15 KA and that of positive rays is about 30 KA, there are several impacts of significant intensities, such as that recorded on June 11, 2014 from 79,900 A (negative) to 2.2 km from the tower and from 95,000 A (Positive) at 1.5 km from the tower. This makes us think that an electrical installation should be protected with potential lightning impacts of these intensities.
e) It is demonstrated that the DDCE compensates the variable electric field in its environment, preventing the formation of the ascending tracer 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.
5. Therefore, the EFFECTIVENESS OF the DDCE in this study (Torre LA MASELLA) of 1 year and 5 months, in a zone with a high incidence of lightning (Ng = 6), is 100% on impacts of direct rays on the structure that protects and 100% on impacts within the area of its coverage radius of 100 meters, 6.
The DDCE only has influence on the electric field that appears in its environment. 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. Barcelona, October 21, 2015 Address: Mr. Javier MALDONADO PARDO Senior Industrial Engineer Official number: 15.211 DINNTECO INTERNATIONAL, S.L.