Every day, a man does not even think of wind velocity and direction. However, measurement of wind strength, velocity, and direction is an essential component of operations of various businesses in different industries.
Recently,ZANDZ Technical Centre has received a task to calculate the lightning protection system for the wind sensor in Leningrad Region. The standards do not state any special requirements to lightning protection of such facilities, but it is important to protect them from direct lightning strike. In our case, a decision was made on arranging a lightning protection system using a lightning arrester installed on the facility. Let us consider the solution we provided below.
Calculation example of the lightning protection for the wind sensor in the Leningrad Region
Facility: wind sensor in Leningrad Region
Датчик - Sensor
Figure 1. Facility layout.
Task: To perform calculation of the lightning protection system for the wind sensor in the Leningrad Region
Protection of buildings against lightning strikes is provided by using lightning arresters. Lightning arrester is a device that is elevated over the protected facility, through which the lightning current goes into the ground bypassing the protected facility. It consists of a lightning rod that accepts the lightning discharge directly, a current collector, and a grounding electrode.
Solutions to meet the requirements to the lightning protection system of the wind sensor in the Leningrad Region:
- The lightning protection is made in accordance with Electrical Installations Code (EIC), Rev. 7., SO 153-34.21.122-2003 "Guidelines for the lightning protection of buildings structures and industrial infrastructure" (further – SO) and WD 34.21.122-87 "Guidelines for the lightning protection of buildings and structures" (further – WD).
- The protected facility is classified as a conventional facility in terms of lightning protection according to SO and to Category 3 according to RD.
- 1 lightning rod 4 m high was installed, fixed on a metal structure by welding. It is taken into account that 0,7 m of the height of interception rods are necessary for mounting.
- 2 current collectors made of copper-plated wire D = 8 mm are installed.
- Current collectors are connected to the metal structure using clamps ZZ-005-064.
- Current collectors are secured (installation spacing 0.6-1 m) to the wall using clamps GL-11703A.
- Mounting of a grounding arrangement consisting of a horizontal electrode (copper-plated steel strip with a cross-section 4 x 30 mm), depth 0.5 meter, and two vertical electrodes (steel copper-plated pins with a diameter 14 mm), 3 m long each.
- The horizontal electrodes are connected to each other using connection terminal ZZ-005-064.
- Connection of the current collector with bringing out of the copper-plated ground bar is performed using a control clamp GL-11562A.
Figure 2 shows hardware layout.
Table 1 includes the list of required hardware and materials.
Датчик - Sensor
Зона защиты Б РД 34.21.122-87 на отм. +8.000 - Protection zone B RD 34.21.122-87 at mark +8.000
Условные обозначения - Legend
- стержневой молниеприемник H=4 м; - lightning rod H = 4 m;
- горизонтальный заземлитель; - horizontal grounding electrode;
- вертикальный заземлитель длиной 3 м; - vertical grounding electrode 3 m long;
- токоотвод; - current collector;
- зажим для подключения проводника - conductor connection clamp
- зажим контрольный (проволока+полоса) - control clamp (wire + strip)
Figure 2. Hardware layout for the lightning protection of the wind sensor in Leningrad Region.
Table 1. List of material requirements.
|
Item # |
Part number |
Product |
Amount |
|
Lightning protection system |
|||
|
1. |
ZZ-201-004 |
1 |
|
|
2. |
GL-11149-20 |
1 |
|
|
3. |
GL-11703A |
20 |
|
|
4. |
GL-11562A |
2 |
|
|
Grounding arrangement |
|||
|
5. |
ZZ-005-064 |
4 |
|
|
6. |
GL-11075-10 |
GALMAR Copper-plated strip (30 x 4 mm/S 120 mm²; 10-meter strip bundle) |
1 |
|
7. |
ZZ-001-065 |
4 |
|
|
8. |
ZZ-002-061 |
3 |
|
|
9. |
ZZ-003-061 |
2 |
|
|
10. |
ZZ-004-060 |
1 |
|
|
11. |
ZZ-006-000 |
1 |
|
|
12. |
ZZ-007-030 |
1 |
|
|
13. |
ZZ-008-000 |
1 |
|
Do you have any questions about lightning protection for the wind sensor or other facilities? Please, contact the ZANDZ Technical Center!
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