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BS EN IEC 61936-1:2021

BS EN IEC 61936-1:2021

$215.11

Power installations exceeding 1 kV AC and 1,5 kV DC – AC

Published By Publication Date Number of Pages
BSI 2021 126
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This part of IEC 61936 provides requirements for the design and the erection of electrical power installations in systems with nominal voltages exceeding 1 kV AC and nominal frequency up to and including 60 Hz, so as to provide safety and proper functioning for the use intended. For the purpose of interpreting this document, an electrical power installation is considered to be one of the following: a) substation, including substation for railway power supply; b) electrical power installations on mast, pole and tower, switchgear and/or transformers located outside a closed electrical operating area; c) one (or more) power station(s) located on a single site, the electrical power installation includes generators and transformers with all associated switchgear and all electrical auxiliary systems. Connections between generating stations located on different sites are excluded; d) the electrical system of a factory, industrial plant or other industrial, agricultural, commercial or public premises; e) electrical power installations on offshore facilities for the purpose of generation, transmission, distribution and/or storage of electricity; f) transition towers/poles (between overhead lines and underground lines). The electrical power installation includes, among others, the following equipment: – rotating electrical machines; – switchgear; – transformers and reactors; – converters; – cables; – wiring systems; – batteries; – capacitors; – earthing systems; – buildings and fences which are part of a closed electrical operating area; – associated protection, control and auxiliary systems; – large air core reactor. NOTE 1 In general, equipment standards take precedence over the requirements of this document. This document does not apply to the design and erection of any of the following: – overhead and underground lines between separate electrical power installations; – electrified railway tracks and rolling stock; – mining equipment and installations; – fluorescent lamp installations; – installations on ships according to IEC 60092 (all parts) and offshore units according to IEC 61892 (all parts), which are used in the offshore petroleum industry for drilling, processing and storage purposes; – electrostatic equipment (e.g. electrostatic precipitators, spray-painting units); – test sites; – medical equipment, e.g. medical X-ray equipment. This document does not apply to the design of prefabricated, type-tested switchgear and high voltage/low voltage prefabricated substation, for which separate IEC standards exist. NOTE 2 The scope of this document does not include the requirements for carrying out live working on electrical power installations. NOTE 3 The scope of this document considers safety requirements for HV installations and the influences of HV installations on LV installations. For electrical installations up to 1 kV, IEC 60364 (all parts) applies.

PDF Catalog

PDF Pages PDF Title
2 undefined
6 Annex ZA (normative)Normative references to international publicationswith their corresponding European publications
9 English
CONTENTS
15 FOREWORD
18 INTRODUCTION
19 1 Scope
20 2 Normative references
22 3 Terms and definitions
3.1 General definitions
24 3.2 Definitions concerning electrical power installations
25 3.3 Definitions concerning types of electrical power installations
3.4 Definitions concerning safety measures against electric shock
26 3.5 Definitions concerning clearances
28 3.6 Definitions concerning control and protection
3.7 Definitions concerning earthing
32 4 Fundamental requirements
4.1 General
4.1.1 General requirements
33 4.1.2 Agreements between supplier and user
34 Tables
Table 1 – References to subclauses where agreement between supplier and user is required
35 4.2 Electrical requirements
4.2.1 Methods of neutral earthing
4.2.2 Voltage classification
4.2.3 Current in normal operation
4.2.4 Short-circuit current
36 4.2.5 Rated frequency
4.2.6 Corona
4.2.7 Electric and magnetic fields
37 4.2.8 Overvoltages
4.2.9 Harmonics
4.2.10 Electromagnetic compatibility
4.3 Mechanical requirements
4.3.1 General
38 4.3.2 Tension load
4.3.3 Erection load
4.3.4 Ice load
4.3.5 Wind load
4.3.6 Switching forces
4.3.7 Short-circuit forces
4.3.8 Loss of conductor tension
4.3.9 Seismic loads
39 4.3.10 Dimensioning of structures
4.4 Climatic and environmental conditions
4.4.1 General
4.4.2 Normal conditions
41 4.4.3 Special conditions
42 4.5 Particular requirements
4.5.1 Effects of small animals and micro-organisms
4.5.2 Noise level
4.5.3 Transport
5 Insulation
5.1 General
43 5.2 Selection of insulation level
5.2.1 General
5.2.2 Consideration of methods of neutral earthing
5.2.3 Consideration of rated withstand voltages
5.3 Verification of withstand values
44 5.4 Minimum clearances of live parts
5.4.1 General
5.4.2 Minimum clearances in voltage range I
5.4.3 Minimum clearances in voltage range II
45 Table 2 – Minimum clearances in air – Voltage range I (1 kV < Um ≤ 245 kV)
46 Table 3 – Minimum clearances in air – Voltage range II (Um > 245 kV)
47 5.5 Minimum clearances between parts under special conditions
5.6 Tested connection zones
6 Electrical equipment
6.1 General requirements
6.1.1 Electrical equipment safety
6.1.2 User safety
48 6.2 Specific requirements
6.2.1 Switching devices
6.2.2 Power transformers and reactors
49 6.2.3 Prefabricated type-tested switchgear
6.2.4 Instrument transformers
50 6.2.5 Surge arresters
6.2.6 Capacitors
51 6.2.7 Line traps
6.2.8 Insulators
6.2.9 Insulated cables
54 6.2.10 Conductors and accessories
6.2.11 Rotating electrical machines
55 6.2.12 Generating units
6.2.13 Generating unit main connections
6.2.14 Static converters
56 6.2.15 Fuses
6.2.16 Electrical and mechanical interlocking
7 Electrical power installations
7.1 General
7.1.1 Common requirements
57 7.1.2 Circuit arrangement
58 7.1.3 Documentation
7.1.4 Transport routes
59 7.1.5 Aisles and access areas
Figure 1 – Minimum approach distance for transport within closed electrical operating areas
60 7.1.6 Lighting
7.1.7 Operational safety
7.1.8 Labelling
7.2 Outdoor electrical power installations of open design
7.2.1 General
Figures
61 7.2.2 Protective barrier clearances
7.2.3 Protective obstacle clearances
62 7.2.4 Boundary clearances
Figure 2 – Protection against direct contact by protective barriers or protective obstacles within closed electrical operating areas
63 7.2.5 Minimum height over access area
Figure 3 – Boundary distances and minimum height at the external fence/wall
64 7.2.6 Clearances to buildings
Figure 4 – Minimum heights within closed electrical operating areas
65 Figure 5 – Approaches with buildings within closed electrical operating areas
66 7.2.7 External fences or walls and access doors
7.3 Indoor electrical power installations of open design
67 7.4 Installation of prefabricated type-tested switchgear
7.4.1 General
7.4.2 Additional requirements for gas-insulated metal-enclosed switchgear
69 7.5 Requirements for buildings
7.5.1 General
7.5.2 Structural provisions
70 7.5.3 Rooms for switchgear
7.5.4 Maintenance and operating areas
7.5.5 Doors
71 7.5.6 Draining of insulating liquids
7.5.7 Heating, ventilation and air conditioning (HVAC)
72 7.5.8 Buildings which require special consideration
7.6 High voltage/low voltage prefabricated substations
7.7 Electrical power installations on mast, pole and tower
8 Safety measures
8.1 General
73 8.2 Protection against direct contact
8.2.1 General
8.2.2 Measures for protection against direct contact
74 8.2.3 Protection requirements
75 8.3 Means to protect persons in case of indirect contact
8.4 Means to protect persons working on or near electrical power installations
8.4.1 General
8.4.2 Electrical equipment for isolating installations or apparatus
76 8.4.3 Devices to prevent reclosing of isolating devices
8.4.4 Devices for determining the de-energized state
8.4.5 Devices for earthing and short-circuiting
77 8.4.6 Equipment acting as protective barriers against adjacent live parts
78 8.4.7 Storage of personal protection equipment
8.5 Protection from danger resulting from arc fault
8.6 Protection against direct lightning strokes
79 8.7 Protection against fire
8.7.1 General
80 8.7.2 Transformers, reactors
81 Table 4 – Guide values for outdoor transformer clearances
82 Figure 6 – Separating walls between transformers
84 Figure 7 – Fire protection between transformer and building
85 Table 5 – Minimum requirements for the installation of indoor transformers
86 8.7.3 Cables
8.7.4 Other equipment with flammable liquid
87 8.8 Protection against leakage of insulating liquid and SF6
8.8.1 Insulating liquid leakage and subsoil water protection
Figure 8 – Example for small transformers without gravel layer and catchment tank
88 Figure 9 – Sump with integrated catchment tank
89 8.8.2 SF6 leakage
Figure 10 – Sump with separate catchment tank
Figure 11 – Sump with integrated common catchment tank
90 8.8.3 Failure with loss of SF6 and its decomposition products
8.9 Identification and marking
8.9.1 General
91 8.9.2 Information plates and warning plates
8.9.3 Electrical hazard warning
8.9.4 Electrical power installations with incorporated capacitors
8.9.5 Emergency signs for emergency exits
8.9.6 Cable identification marks
9 Protection, automation and auxiliary systems
9.1 Protection systems
92 9.2 Automation systems
93 9.3 Auxiliary systems
9.3.1 AC and DC supply circuits
94 9.3.2 Compressed air systems
95 9.3.3 SF6 gas handling plants
9.3.4 Hydrogen handling plants
9.4 Basic rules for electromagnetic compatibility of control systems
9.4.1 General
96 9.4.2 Electrical noise sources in electrical power installations
9.4.3 Measures to be taken to reduce the effects of high frequency interference
9.4.4 Measures to be taken to reduce the effects of low frequency interference
97 9.4.5 Measures related to the selection of electrical equipment
98 9.4.6 Other possible measures to reduce the effects of interference
10 Earthing systems
10.1 General
10.2 Fundamental requirements
10.2.1 Safety criteria
99 10.2.2 Functional requirements
10.2.3 High and low voltage earthing systems
100 10.3 Design of earthing systems
10.3.1 General
Table 6 – Minimum requirements for interconnection of low-voltage and high-voltage earthing systems based on EPR limits
101 10.3.2 Power system faults
10.3.3 Lightning and transient overvoltages
102 10.4 Construction work on earthing systems
10.5 Measurements
10.6 Maintainability
10.6.1 Inspections
10.6.2 Measurements
Figure 12 – Permissible touch voltage UTp
103 11 Inspection and testing
11.1 General
11.2 Verification of specified performances
104 11.3 Tests during installation and commissioning
11.4 Trial running
12 Operation and maintenance manual
105 Annexes
Annex A (informative) Values of rated insulation levels and minimum clearances based on current practice in some countries
Table A.1 – Values of rated insulation levels and minimum clearances in air for 1 kV < Um ≤ 245 kV for highest voltage for installation Um not standardized by the IEC based on current practice in some countries
106 Table A.2 – Values of rated insulation levels and minimum clearances in air for 1 kV < Um ≤ 245 kV for highest voltage for installation Um not standardized by the IEC based on current practice in some countries
107 Table A.3 – Values of rated insulation levels and minimum clearances in air for Um > 245 kV for highest voltages for installation Um not standardized by the IEC based on current practice in some countries
108 Annex B (normative) Method of calculating permissible touch voltages
109 Annex C (normative) Permissible touch voltage according to IEEE 80
Figure C.1 – Permissible touch voltage UTp according to IEEE 80
110 Annex D (normative) Earthing system design flow chart
111 Annex E (informative) Protection measures against direct lightning strokes
E.1 General
E.2 Shield wires
E.3 Lightning rods
112 Figure E.1 – Single shield wire
Figure E.2 – Two shield wires
113 Figure E.3 – Single lightning rod
Figure E.4 – Two lightning rods
114 Annex F (informative) Considerations of design for safe working
115 Figure F.1 – Working clearances within closed electrical operating areas
116 Annex G (informative) List of notes concerning particular conditions in certain countries
122 Bibliography

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BS EN IEC 61936-1:2021
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