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BS EN 50341-2-21:2023 Overhead electrical lines exceeding AC 1 kV. National Normative Aspects (NNA) for Slovenia (based on EN 50341-1:2012), 2023
- undefined
- European foreword [Go to Page]
- 1.1 General
- 1.2 Field of application
- 2.1 Normative references
- 2.2 Definitions
- 2.3 Symbols
- 3. Basis of design
- 3.2 Requirements of overhead lines
- 3.2.2 Reliability requirements
- 3.3 Limit states [Go to Page]
- 3.3.1 General
- 4. Actions on lines [Go to Page]
- 4.1 Introduction
- 4.2 Permanent loads
- 4.3 Wind loads [Go to Page]
- 4.3.1 Field of application and basic wind velocity
- 4.3.2 Mean wind velocity
- 4.3.3 Mean wind pressure
- 4.3.4 Turbulence intensity and peak wind pressure
- 4.4 Wind forces on overhead line components [Go to Page]
- 4.4.1 Wind forces on conductors
- 4.4.2 Wind loads on insulator sets
- 4.4.3 Wind forces on lattice towers
- 4.4.4 Wind forces on poles
- 4.5 Ice loads [Go to Page]
- 4.5.1 General
- 4.5.2 Ice forces on conductors
- 4.6 Combined wind and ice loads [Go to Page]
- 4.6.1 Combined probabilities
- 4.6.2 Drag factors and ice densities
- 4.6.3 Mean wind pressure and peak wind pressure
- 4.6.6 Combination of wind velocities and ice loads
- 4.7 Temperature effects
- 4.8 Security loads [Go to Page]
- 4.8.1 General
- 4.9 Safety loads
- 4.9.1 Construction and maintenance loads
- 4.11 Other special forces
- 4.11.1 Avalanches, creeping snow
- 4.11.2 Earthquakes
- 4.12 Load cases [Go to Page]
- 4.12.1 General
- 4.12.2 Standard load cases
- 4.13 Partial factors for actions
- 5. Electrical requirements [Go to Page]
- 5.2 Currents [Go to Page]
- 5.2.1 Normal current
- 5.3 Insulation co-ordination
- 5.4 Classification of voltages and overvoltages [Go to Page]
- 5.4.2 Representative power frequency voltages
- 5.4.5 Representative fast-front overvoltages
- 5.5 Minimum air clearance to avoid flashover
- 5.6 Load cases for calculation of clearances [Go to Page]
- 5.6.2 Maximum conductor temperature
- 5.6.3 Wind loads for determination of electric clearances [Go to Page]
- C T2 square of the conversion factor, C T2=0,58.
- 5.6.4 Ice loads for determination of electric clearances
- 5.6.5 Combined wind and ice loads
- 5.8 Internal clearances within the span and at the top of support
- 5.9 External clearances [Go to Page]
- 5.9.1 General
- 5.9.2 External clearances to ground in areas remote from buildings, roads, etc.
- 5.9.3 External clearances to residential and other buildings
- 5.9.5 External clearances to adjacent traffic routes
- 5.9.6 External clearances to other power lines or overhead telecommunication lines
- 5.9.7 External clearances to recreational areas (playgrounds, sports areas, etc.)
- 5.10 Corona effect [Go to Page]
- 5.10.1 Radio noise
- 5.10.2 Audible noise
- 5.11 Electric and magnetic fields [Go to Page]
- 5.11.1 Electric and magnetic fields under overhead line
- 5.11.2 Electric and magnetic field induction
- 5.11.3 Interference with telecommunications circuits
- 6 Earthing systems [Go to Page]
- 6.1 Introduction [Go to Page]
- 6.1.3 Earthing measures against lighting effects
- 6.1.4 Transferred potentials
- 6.3 Dimensioning with regard to thermal strength [Go to Page]
- 6.3.2 Current rating calculation
- 6.4 Dimensioning with regard to human safety [Go to Page]
- 6.4.2 Touch voltage limits at different locations
- 6.5 Site inspection and documentation of earthing systems
- 7 Supports [Go to Page]
- 7.1 Initial design considerations
- 7.2 Materials
- 7.2.1 Steel materials, bolts, nuts and washers, welding consumables
- (ncpt) SI.1 Materials for steel components
- 7.3 Lattice steel towers
- 7.3.1 General [Go to Page]
- 7.3.5 Structural analysis
- 7.3.6 Ultimate limit states
- 7.3.8 Resistance of connections
- 7.4 Steel poles [Go to Page]
- 7.4.1 General
- 7.4.7 Serviceability limit states (EN 1993-1-1:2005 – Chapter 7)
- 7.4.8 Resistance of connections
- 7.5 Wood poles [Go to Page]
- 7.5.5 Ultimate limit states
- 7.5.7 Resistance of connections
- 7.6 Concrete poles
- 7.9 Corrosion protection and finishes [Go to Page]
- 7.9.1 General
- 7.10 Maintenance facilities [Go to Page]
- 7.10.1 Climbing
- 7.10.2 Maintainability
- 8 Foundations [Go to Page]
- 8.1 Introduction
- 8.2 Basis of geotechnical design (EN 1997-1:2004, chapter 2) [Go to Page]
- 8.2.2 Geotechnical design by calculation
- 9 Conductors and earth-wires [Go to Page]
- 9.2 Aluminium based conductors [Go to Page]
- 9.2.1 Characteristics and dimensions
- 9.2.3 Conductors service temperatures and grease characteristics
- 9.3 Steel based conductors
- 9.6 General requirements
- 10 Insulators [Go to Page]
- 10.2 Standard electrical requirements
- 10.7 Mechanical requirements
- 11.5 Short circuit current and power arc requirements
- 11.6 Mechanical requirements
- Annex G(normative)Calculation methods for earthing systems
- Annex J(normative)Angles in lattice steel towers
- Annex M(informative)Geotechnical and structural design of foundations [Go to Page]
