Risk Assessment Conclusion - Furuno WR2120 Installation Manual

Weather radar

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A.2.3. Risk assessment conclusion

Values of the risk components for the unprotected structure are reported in the regulation.

The public service loss (L2) and the economic loss (L4) are relevant for this type of structure. It is

required to evaluate the need for protection. This implies the determination of the risk ��

risk ��

for L4 with the risk components ��

tolerable risk ��

below the tolerable risk.

According to the IEC 62305-2, calculation of the risk parameters is shown as follows:

Table A.4: Risk components for different types of damage and source of damage (IEC 62305-2)

Damage

��

= ��

��

= ��

��

Calculation of the risk components requirement is as shown in Table A.5.

Table A.5: Weather radar at CWRP: Environment and structure characteristics

Input parameter

Ground flash density [ 1/km

Number of over voltages [1/year]

Structure dimensions [m]

Location factor of structure

Use the Table A.4 and the Table A.5, risk assessment result will be calculated. The result is shown

in the Table A.6. Therefore considering current condition, the weather radar is not protected by

existing lightning rods. Total risk value is exceeded of the tolerable risk value.

We'll propose solution for this later, protecting the radar by additional lightning rod and adapt LPL

Class IV. Assessment for this solution is also shown in the Table A.6. According to the result is

almost half of the tolerable risk value, so the condition of the radar turned into safe.

Type of damage

D2: Physical Damage

D3 failure of

internal systems

Total

Tolerable ��

−3

. Suitable protection measures will be selected to reduce the risk to or

= 10

��

× ��

��

× ��

��

= ��

× ��

��

/year ]

Table A.6: Risk assessment result at CWRP

Symbol

��

= 0.001

��

, ��

��

Source of damage

��

= (��

+ ��

��

= (��

+ ��

× ��

��

Symbol

��

L, W, H

��

Current Condition

0.01

0.1323

-6

3.36 x 10

-4

3.36 x 10

0.134

and ��

and to compare it with the

��

) × ��

× ��

��

) × ��

× ��

��

= ��

��

Value

16.8

-3

2.709 x 10

13.227

-4

3.36 x 10

-2

3.36 x 10

0.95, 0.95, 3.177

0.5

Protected by LPL IV

0.0005

-6

1.37 x 10

-7

1.68 x 10

-5

1.68 x 10

0.00052

Safety

for L2 and

× ��

��

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Risk Assessment Conclusion - Furuno WR2120 Installation Manual

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