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22 November 2015Protection of LED Driver Power Supplies
26 November 2015Protection against lightning and overvoltage requires one of the most important steps: performing a lightning risk assessment. Just as every building is different, each geography is unique. In Turkey, for example, Antalya, Mersin, and Muğla have a high risk of lightning strikes, and the strikes are particularly strong. Another important factor in lightning risk assessment is that all calculations and engineering must comply with IEC 62305-2 standards. Based on this risk assessment, decisions should be made on how to protect against lightning and which products to select.
Risk Assessment of Buildings
Lightning strikes affecting the building, as a source of damage:
- S1: Directly to the building
- S2: Near the building
- S3: To service installations
- S4: Near service installations
Separation of Lightning Effects:
- D1: Harm to living beings due to touch and step voltages
- D2: Physical damage
- D3: Malfunction of internal systems due to electromagnetic effects
Classification of Losses
Possible losses due to lightning strikes:
- L1: Loss of life
- L2: Loss of public services
- L3: Loss of cultural heritage
- L4: Loss of economic assets
- R1: Risk of loss of life
- R2: Risk of loss of public services
- R3: Risk of loss of cultural heritage
- R4: Risk of loss of economic assets
These values need to be calculated. Each risk component can be expressed using the general equation:
Rx = Nx . Px . Lx
Nx: Annual number of hazardous events
Px: Probability of building damage
Lx: Loss
By calculating this component, it can be determined whether protection against lightning is required based on an acceptable level.
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