Factors Influencing Risk components

Introduction:

IS/IEC 62305 part 2 explains about the damage due to lightning strikes, source of such damages, Losses due to lightning and corresponding risks. One of the major parameters that determine the level of protection is Number of Thunderstorm days in a year at the location. This value varies for different places and apart from this there are so many parameters that determine the value of each risk component. In this article we shall explore about what are the factors on which risk component depends on.

Risk Components:

Risk components are related to damages and the corresponding losses caused by the source of lightning. The Risk components are mainly categorized into four types based on the source of damage and each type has sub
divisions based on the type of damage it can create ( https://www.linkedin.com/feed/update/urn:li:activity:6696747058721882112/)

Risk components for a structure due to flashes to the structure:

RA:

• Risk component related to injury to living beings inside the structure and outside in the zones up to 3m around down conductors. Loss of type L1 and L4 with possible loss of animals may also arise.

RB:

• Risk component related to physical damage caused by dangerous sparking inside the structure. All types of loss (L1, L2, L3 and L4) may arise.

RC:

• Risk component related to failure of internal systems caused by LEMP. Losses of type L2 and L4 will occur.
• Loss of type L1 will occur only in the case of structures with the risk of explosion or other structures where failure of internal systems immediately endangers humanlife.

Risk components for a structure due to flashes near the structure:

RM:

• Risk component related to failure of internal systems caused by LEMP. Losses of type L2 and L4 will occur.
• Loss of type L1 will occur only in the case of structures with the risk of explosion or other structures where failure of internal systems immediately endangers humanlife.

Risk components for a structure due to flashes to a line connected to the structure:

RU:

• Risk component related to injury to living beings caused by electric shock due to touch voltage inside the structure.
• Loss of type L1 and in case of agricultural property loss L4 with possible loss of animals may also occur.

Rv :

• Risk component related to physical damage due to lightning current transmitted through or along incoming lines. All types of losses (L1, L2, L3 and L4) may occur.

RW:

• Risk component related to failure of internal systems caused by over voltages induced on incoming lines and transmitted to the structure. Losses of type L2 and L4 will occur.
• Loss of type L1 will occur only in the case of structures with the risk of explosion or other structures where failure of internal systems immediately endangers human life.

Risk components for a structure due to flashes near a line connected to the
structure:

RZ:

• Risk component related to failure of internal systems caused by over voltages induced on incoming lines and transmitted to the structure. Losses of type L2 and L4 will occur.
• Loss of type L1 will occur only in the case of structures with the risk of explosion or other structures where failure of internal systems immediately endangers human life.

Factors influencing risk components:

The risk component depends on the following factors

1. LPS – Lightning Protection System:

• By providing LPS we can reduce the risk caused by lightning flashes to the structure, flashes near the structure and flashes to the line connected to the structure.

2. Coordinated SPD System:

• A properly selected SPD is installed in order to reduce the failure of electric and electronics equipment.

3. Isolating Interfaces:

• The device used to isolate in order to reduce surges on the lines entering the lightning protection zone.

4. Impulse withstand voltage:

• By providing proper insulation of equipment to withstand the transient voltage

5. Collection area:

• The area must be completely protected to reduce all types of damages and its corresponding
losses.

IS/IEC 62305 part 2 explains about the factors on which the risk components depends on. Some of the major
factors are listed below.

Factors influencing Risk components

Note:
a - Only for grid like external LPS
b - Due to equipotential bonding
c - Only if they belong to equipment

 

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