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BSI 21/30442985 DC:2021 Edition

BSI 21/30442985 DC:2021 Edition

$24.66

BS IEC 62305-2. Protection against lightning – Part 2. Risk management

Published By Publication Date Number of Pages
BSI 2021 127
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PDF Pages PDF Title
11 FOREWORD
13 INTRODUCTION
15 1 Scope
2 Normative references
3 Terms and definitions
3.1 structure to be protected
16 3.2 structures with risk of explosion
3.3 structures dangerous to the environment
3.4 urban environment
3.5 suburban environment
3.6 rural environment
3.7 rated impulse voltage UW
3.8 electrical system
3.9 electronic system
3.10 internal systems
3.11 lines
17 3.12 telecommunication lines
3.13 power lines
3.14 dangerous event
3.15 lightning flash to a structure
3.16 lightning flash near a structure
3.17 lightning flash to a line
3.18 lightning flash near a line
3.19 ground flash density
3.20 lightning ground strike-point density
3.21 number of dangerous events due to flashes to a structure
3.22 number of dangerous events due to flashes to a line
18 3.23 number of dangerous events due to flashes near a structure
3.24 number of dangerous events due to flashes near a line
3.25 lightning electromagnetic pulse
3.26 surge
3.27 node
3.28 physical damage
3.29 injury to human beings
3.30 failure of internal systems
3.31 probability of damage
3.32 frequency of damage
19 3.33 frequency of damage component
3.34 tolerable frequency of damage
3.35 loss
3.36 loss of public relevance
3.37 service
3.38 service of public relevance
3.39 risk
3.40 risk component
3.41 tolerable risk
3.42 risk zone of a structure
20 3.43 section of a line
3.44 lightning protection zone
3.45 lightning protection level
3.46 protection measures
3.47 lightning protection
3.48 lightning protection system
3.49 surge protection measures
3.50 electromagnetic shield
21 3.51 lightning protective cable
3.52 lightning protective cable-duct
3.53 surge protective device
3.54 coordinated SPD system
3.55 isolating interfaces
3.56 lightning equipotential bonding
3.57 thunderstorm warning system
3.58 lightning related event
22 3.59 lightning related conditions
3.60 monitoring area
3.61 surrounding area
3.62 zone 0
3.63 zone 1
3.64 zone 2
23 3.65 zone 20
3.66 zone 21
3.67 zone 22
3.68 Adjacent structure
24 4 Symbol and abbreviations
28 5 Damage and loss
5.1 Source of damage
5.2 Cause of damage
5.3 Type of loss
29 6 Risk and risk components
6.1 Risk
6.2 Risk components
6.2.1 Risk components for a structure due to source S1
30 6.2.2 Risk components for a structure due to source S2
6.2.3 Risk components for a structure due to source S3
6.2.4 Risk component for a structure due to source S4
6.2.5 Factors affecting risk components for a structure
31 6.3 Composition of risk components
6.3.1 Composition of risk components according to source of damage
32 6.3.2 Composition of risk components according to type of loss
33 7 Risk assessment
7.1 Basic procedure
7.2 Structure to be considered for risk assessment
7.3 Procedure to evaluate the need of protection for risk R
36 8 Assessment of risk components
8.1 Basic equation
8.2 Assessment of risk components due to different sources of damage
38 8.3 Partitioning of a structure in risk zones ZS
8.4 Partitioning of a line into sections SL
39 8.5 Assessment of risk components in a zone of a structure with risk zones ZS
8.5.1 General criteria
8.5.2 Single-zoned structure
8.5.3 Multi-zoned structure
40 9 Frequency of damage and its components
9.1 Frequency of damage
9.2 Assessment of partial frequency of damage
41 9.3 Procedure to evaluate the need of protection for frequency of damage F
44 9.4 Assessment of partial frequency of damage in a structure with risk zones ZS
9.4.1 General criteria
9.4.2 Single-zoned structure
9.4.3 Multi-zoned structure
45 Annex A (informative) Assessment of annual number N of dangerous events
A.1 General
A.2 Assessment of the average annual number of dangerous events ND due to flashes to a structure and NDJ to an adjacent structure
A.2.1 Determination of the collection area AD
46 A.2.1.1 Rectangular structure
A.2.1.2 Complex-shaped structure
48 A.2.2 Structure as a part of a building
49 A.2.3 Relative location of the structure
50 A.2.4 Number of dangerous events ND for the structure
A.2.5 Number of dangerous events NDJ for an adjacent structure
A.3 Assessment of the average annual number of dangerous events NM due to flashes near a structure
51 A.4 Assessment of the average annual number of dangerous events NL due to flashes to a line
52 A.5 Assessment of average annual number of dangerous events NI due to flashes near a line
54 Annex B (informative) Assessment of probability PX of damage
B.1 General
55 B.2 Probability PAT that a flash to a structure will cause dangerous touch and step voltage
56 B.3 Probability PAD that a flash will cause damage to an exposed person on the structure.
57 B.4 Probability PB that a flash to a structure will cause physical damage by fire or explosion
59 B.5 Probability PC that a flash to a structure will cause failure of internal systems
63 B.6 Probability PM that a flash near a structure will cause failure of internal systems
65 B.7 Probability PU that a flash to a line will cause damage due to touch voltage
67 B.8 Probability PV that a flash to a line will cause physical damage by fire or explosion
68 B.9 Probability PW that a flash to a line will cause failure of internal systems
B.10 Probability PZ that a lightning flash near an incoming line will cause failure of internal systems
69 B.11 Probability PP that a person will be in a dangerous place
B.12 Probability Pe that an equipment will be exposed to damaging event
70 Annex C (informative) Assessment of loss LX
C.1 General
C.2 Mean relative loss per dangerous event
73 Annex D (informative) PSPD Evaluation
D.1 Introduction
D.2 PQ values
D.2.1 Probability values of the both negative and positive first strokes
74 D.2.2 Source of damage S1
D.2.3 Source of damage S3
75 D.2.4 Sources of damage S2 and S4
D.3 SPD protection level
D.3.1 Source of damage S1
D.3.1.1 One voltage limiting SPD
76 D.3.1.2 One voltage switching SPD
77 D.3.1.3 Combination of voltage limiting SPD and voltage switching SPD
D.3.1.4 Two voltage limiting SPDs
78 D.3.1.5 Two SPDs: one voltage switching SPD and one voltage limiting SPD
79 D.3.2 Source of damage S3
D.3.2.1 One voltage limiting SPD
80 D.3.2.2 One voltage switching SPD
82 D.3.2.3 Limiting type SPD and voltage switching SPD
83 D.3.2.4 Two voltage limiting SPDs
84 D.3.3 Energy coordinated SPDs: One voltage switching SPD and one voltage limiting SPD downstream
87 D.4 Source of damage S4
D.4.1 One voltage limiting SPD
D.4.2 One voltage switching SPD
88 D.5 Source of damage S2
90 Annex E (informative) Detailed investigation of additional losses LE related to surroundings
E.1 General
E.2 Calculation of risk components
94 Annex F (informative) Case study
F.1 General
F.2 Country house
F.2.1 Relevant data and characteristics
96 F.2.2 Calculation of expected annual number of dangerous events
F.2.3 Risk management
97 F.2.4 Definition of risk zones in the country house
98 F.2.5 Risk R assessment
99 F.2.6 Risk R – Selection of protection measures
100 F.2.7 Conclusions
101 F.3 Office building
F.3.1 Relevant data and characteristics
103 F.3.2 Calculation of expected annual number of dangerous events
104 F.3.3 Risk management
F.3.4 Definition of zones in the office building
110 F.3.5 Risk R assessment
111 F.3.6 Frequency of damage F assessment
F.3.7 Risk R – Selection of protection measures
112 F.3.8 Frequency of damage F – Selection of protection measures
F.3.9 Conclusions
113 F.4 Hospital
F.4.1 Relevant data and characteristics
114 F.4.2 Calculation of expected annual number of dangerous events
115 F.4.3 Risk management
F.4.4 Definition of zones in the hospital
121 F.4.5 Risk R assessment
122 F.4.6 Frequency of damage F assessment
123 F.4.7 Risk R – Selection of protection measures
124 F.4.8 Frequency of damage F – Selection of protection measures
125 F.4.9 Conclusions
126 F.5 Industrial building
127 Bibliography

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