SIST EN 50341-2-6:2018

SLOVENSKI STANDARD
SIST EN 50341-2-6:2018
01-februar-2018
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Overhead electrical lines exceeding AC 1 kV - Part 2-6: National Normative Aspects
(NNA) for SPAIN (based on EN 50341-1:2012)
Lignes électriques aériennes dépassant 1 kV en courant alternatif - Partie 2-6: Aspects
normatifs nationaux (NNA)pour l'ESPAGNE (basé sur l'EN 50341-1:2012)
Ta slovenski standard je istoveten z: EN 50341-2-6:2017
ICS:
29.240.20 Daljnovodi Power transmission and
distribution lines
SIST EN 50341-2-6:2018 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 50341-2-6:2018

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SIST EN 50341-2-6:2018
EUROPEAN STANDARD EN 50341-2-6
NORME EUROPÉENNE
EUROPÄISCHE NORM
February 2017
ICS 29.240.20
English Version
Overhead electrical lines exceeding AC 1 kV - Part 2-6:
National Normative Aspects (NNA) for SPAIN
(based on EN 50341-1:2012)
Lignes électriques aériennes dépassant 1 kV en courant
alternatif - Partie 2-13: Aspects normatifs nationaux
(NNA)pour l'ESPAGNE (basé sur l'EN 50341-1:2012)
This European Standard was approved by CENELEC on 2017-02-01.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden,
Switzerland, Turkey and the United Kingdom.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2017 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN 50341-2-6:2017 E

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EN 50341-2-6:2017 - 2 - Spain

Contents
Page
1 SCOPE 6
1.1 General . 6
1.2 Field of application . 6
2 NORMATIVE REFERENCES, DEFINITIONS AND SYMBOLS 6
2.1 Normative references . 6
2.3 Symbols . 6
3 BASIS OF DESIGN 7
3.2 Requirements of overhead lines . 7
3.2.2 Reliability requirements . 7
3.2.5 Strength coordination . 7
3.6 Design values . 7
3.6.2 Design value of an action . 7
3.6.3 Design value of a material property . 7
3.7 Partial factor method and design formula . 7
3.7.2 Basic design formula . 7
4 ACTIONS ON LINES 8
4.1 Introduction . 8
4.2 Permanent loads . 8
4.3 Wind loads . 8
4.3.1 Field of application and basic wind velocity . 8
4.3.5 Wind forces on any overhead line component . 8
4.4 Wind forces on overhead line components . 10
4.5 Ice loads . 10
4.5.2 Ice forces on conductors . 10
4.7 Temperature effects . 10
4.8 Security loads . 10
4.8.1 General . 10
4.8.2 Torsional loads . 11
4.8.3 Longitudinal loads . 11
4.12 Load cases . 12
4.12.1 General . 12
4.12.2 Standard load cases . 12
4.13 Partial factors for actions . 12
5 ELECTRICAL REQUIREMENTS 13
5.2 Currents . 13
5.2.1 Normal current. 13
5.3 Insulation co-ordination . 14
5.4 Classification of voltages and overvoltages . 17

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Page
5.4.2 Representative power frequency voltages . 17
5.5 Minimum air clearance distances to avoid flashovers. 18
5.6 Load cases for calculation of clearances . 19
5.6.1 Load conditions . 19
5.8 Internal clearances within the span and at the top of support . 19
5.9 External clearances . 21
5.9.1 General . 21
5.9.2 External clearances to ground in areas remote from buildings, roads, etc. . 22
5.9.3 External clearances to residential and other buildings . 23
5.9.4 External clearances to crossing traffic routes . 24
5.9.5 External clearances to adjacent traffic routes . 25
5.9.6 External clearances to other power lines or overhead telecommunication lines . 26
5.9.7 External clearances to recreational areas (playgrounds, sports areas, etc.) . 29
6 EARTHING SYSTEMS 29
6.1 Introduction . 29
6.1.2 Requirements for dimensioning of earthing systems . 29
6.1.3 Earthing measures against lightning effects . 30
6.2 Ratings with regards to corrosion and mechanical strength . 30
6.2.2 Earthing and bonding conductors . 30
6.3 Dimensioning with regard to thermal strength . 30
6.3.1 General . 30
6.3.2 Current rating calculation . 31
6.4 Dimensioning with regard to human safety . 31
6.4.1 Permissible values for touch voltage . 31
6.4.3 Basic design of earthing systems with regard to permissible touch voltage . 31
6.5 Site inspection and documentation of earthing systems . 32
7 SUPPORTS 33
7.2 Materials . 33
7.2.1 Steel materials, bolts, nuts and washers, welding consumables . 33
7.2.5 Concrete and reinforced steel . 33
7.2.6 Wood . 33
7.3 Lattice steel towers . 33
7.3.1 General . 33
7.3.6 Ultimate limit states . 34
7.3.8 Resistance of connections . 34
7.3.9 Design assisted by testing . 34
7.4 Steel poles . 35
7.4.1 General . 35
7.4.2 Basis of design (EN 1993-1-1:2005 - Chapter 2) . 35
7.4.6 Ultimate limit states (EN 1993-1-1:2005 - Chapter 6) . 35
7.4.8 Resistance of connections . 35

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Page
7.4.9 Design assisted by testing . 35
7.5 Wood poles . 36
7.5.1 General . 36
7.5.2 Basis of design . 36
7.5.5 Ultimate limit states . 36
7.6 Concrete poles . 36
7.6.1 General . 36
7.6.4 Ultimate limit states . 36
7.6.5 Serviceability limit states . 36
7.6.6 Design assisted by testing . 36
7.7 Guyed structures . 37
7.7.1 General . 37
7.7.4 Ultimate limit states . 37
7.8 Other structures. 37
8 FOUNDATIONS 37
8.1 Introduction . 37
8.2 Basis of geotechnical design (EN 1997-1:2004 - Section 2) . 37
8.2.2 Geotechnical design by calculation . 37
8.3 Soil investigation and geotechnical data (EN 1997-1:2004 - Section 3) . 39
8.6 Interactions between support foundations and soil . 40
9 CONDUCTORS AND EARTH-WIRES 40
9.2.4 Mechanical requirements . 40
9.6 General requirements . 40
9.6.2 Partial factor for conductors . 40
10 INSULATORS 40
10.2 Standard electrical requirements . 40
10.7 Mechanical requirements . 40
11 HARDWARE 41
11.6 Mechanical requirements . 41
11.9 Characteristics and dimensions of fittings . 41
Tables
Table 5.2.1/ES.1 – Conductor current density .
Table 5.3.1/ES.1 – Standard insulation levels for range I (1 kV < Um ≤ 245 kV) .
Table 5.3.2/ES.1 – Standard insulation levels for range II (Um > 245 kV) .
Table 5.3.3/ES.1 – Recommended air clearances .
Table 5.4/ES.1 – Nominal voltages and highest grid voltages .
Table 5.5/ES.1 – Minimum air clearance distances, D and D , to avoid flashover .
el pp
Table 5.8/ES.1 – Coefficient K based on the oscillation angle .
Table 5.9.6/ES.1 – Additional clearances, D , to other overhead power lines or overhead
add
telecommunication lines .
Table 8.3/ES.1 – Indicative soil characteristics for the calculation of the foundation .
Table G.6/ES.1 – Fault duration related to touch voltage, UTp .

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European foreword
1 The Spanish National Committee (NC) is identified by the following address:
Asociación Española de Normalización (UNE)
c/Génova, 6
E 28004 Madrid
Spain

Tel. nº: + 34 915 294 900
Fax nº: + 34 91 310 45 96
Email: info@une.org

Name of the relevant technical body: AEN/CTN 207/SC 7-11 “Líneas eléctricas aéreas” (Overhead
power lines)
2 The Spanish NC and its technical body AEN/CTN 207/SC 7-11 “Overhead power lines” has prepared
this Part 2-6 of EN 50341, listing the Spanish National Normative Aspects (NNA) under its sole
responsibility, and duly passed it through the CENELEC and CLC/TC 11 procedures.
NOTE: The Spanish NC also takes sole responsibility for the technically correct co-ordination of this EN 50341-2-
6 with EN 50341-1. It has performed the necessary checks in the frame of quality assurance/control. However, it
is noted that this quality control has been made in the framework of the general responsibility of a standards
committee under the national laws/regulations.
3 This Part 2-6 is normative in Spain and informative in other countries.
4 This document shall be read in conjunction with Part 1 (EN 50341-1). All clause numbers used in this
NNA correspond to those of Part 1. Specific sub-clauses that are prefixed “ES”, are to be read as
amendments to the relevant text in Part 1. Any necessary clarification regarding the application of this
combined NNA in conjunction with Part 1 shall be referred to the Spanish NC who will, in co-operation
with CLC/TC 11, clarify the requirements.
When no reference is made in this NNA to a specific sub-clause, then Part 1 applies.
5 In case of “boxed values” defined in Part 1, amended values (if any), which are defined in this NNA,
shall be taken into account in Spain.
However, any “boxed value”, whether in Part 1 or in this NNA, shall not be amended in the direction of
greater risk in a Project Specification.
6 The national Spanish standards/regulations related to overhead electrical lines exceeding 1 kV A.C.
are listed in sub-clause 2.1/ES.1 and ES.2.
NOTE: All national standards referred to in this NNA will be replaced by the relevant European Standards as
soon as they become available and are declared by the Spanish NC to be applicable and thus reported to the
secretary of CLC/TC 11.
7 The Spanish NC declares, in accordance with sub-clause 4.1 of Part 1, that “Approach 3” shall be
used in Spain to stablish numerical values of actions.

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1 Scope

1.1 General

(ncpt) ES.1 General

This NNA is applicable to any new line between two points, A and B, its modifications and
extensions.

1.2 Field of application

(A-dev) ES.1 RD 223/2008, ITC-LAT 08, sub-clause 6.3.2

The design and construction of overhead lines with covered conductors and voltages greater than
45 kV shall respect the same electrical clearances as of overhead lines with bare conductors of the
same voltage.

2 Normative references, definitions and symbols

2.1 Normative references

(A-dev) ES.1 National normative regulations

Royal Decree (RD) 223/2008, of 15th February 2008, approving the Regulation on technical and
safety conditions for high voltage electrical lines and its Supplementary Technical Instructions ITC-
LAT 01 to 09

Royal Decree (RD) 337/2014, of 9th May 2014, approving the Regulation on technical and safety
conditions for high voltage power installations and its Supplementary Technical Instructions ITC-
RAT 01 to 23

Royal Decree (RD) 614/2001, of 8th June 2001, establishing the minimum health and safety
requirements for the protection of workers against the electrical risk

Royal Decree (RD) 1955/2000, of 1st December 2000, regulating the activities of transmission,
distribution, marketing and supply of electrical energy and the procedures for the authorization of
installations

(ncpt) ES.2 National normative standards

UNE 207016 “HV and HVH type concrete poles for overhead electrical lines”

UNE 207017 “Lattice steel towers for distribution overhead electrical lines”

UNE 207018 “Plate metallic supports for overhead electrical lines”

2.3 Symbols

(ncpt) ES.1 Additional symbols

a minimum insulator set discharge gap, defined as shortest distance in straight line
som
between live parts and earthed parts
2
A wind exposed pole area projected in a wind direction perpendicular plane in m
T
CS minimum security factor defined for each element and load case
D clearance between same or different circuits’ phase conductors in metres
F maximum sag in metres, for load cases defined in sub-clause 3.2.3
K coefficient depending on the conductors’ wind oscillation, it shall be selected from Table
5.8/ES.1
K’ coefficient depending on overhead lines nominal voltage. K’ = 0,85 for special category
lines and K’ = 0,75 for other overhead lines
L suspension set length in metres. For conductors attached to the pole with strain or post-
insulator sets L = 0

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V reference wind velocity in km/h
V

3 Basis of design

3.2 Requirements of overhead lines

3.2.2 Reliability requirements

(A-dev) ES.1 RD 223/2008, clause 16

For private overhead lines, a competent licensed technician, with the authorization of overhead
line’s owner, may adopt in emergency situations the recommended provisional steps, immediately
advising to the competent Administration body, which shall set the period to restore the regulation
conditions.

(ncpt) ES.2 Reliability levels

The minimum reliability level shall be 1. Actions for wind and ice are defined in section 4.

3.2.5 Strength coordination

(snc) ES.1 Strength coordination

Strength coordination is obtained by matching the security factors (CS) associated to each
component and system of the overhead line.

3.6 Design values

3.6.2 Design value of an action

(A-dev) ES.1 Design value of an action

Actions shall not be affected by partial factors.

3.6.3 Design value of a material property

(A-dev) ES.1 Partial factor for a material property

The partial factor for a material property shall be:

X = X / CS
d K

Where:

X is the design value of the material property
d
XK is the characteristic value of the material property
CS is the minimum security factor for each element and load case defined in sub-clause
4.13/ES.1

3.7 Partial factor method and design formula

3.7.2 Basic design formula

(snc) ES.1 Basic design formula

When considering a limit state of rupture or excessive deformation of a component, element or
connection, it shall be verified that:

R / E ≥ CS
d d

Where:

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E is the total design value of the effect of actions, such as internal force or moment, or a
d
representative vector of several internal forces or moments, as defined in sub-clause
3.7.2 of the main body
R is the corresponding structural design resistance, as defined in sub-clause 3.7.2 of the
d
main body
CS is the minimum security factor for each element and load case defined in clause
4.13/ES.1

4 Actions on lines

4.1 Introduction

(snc) ES.1 Introduction

Due to the lack, in general, of official statistical data, in Spain Approach 3 shall be used to stablish
the numerical values of actions.

4.2 Permanent loads

(A-dev) ES.1 RD 223/2008, ITC-LAT 07, sub-clause 3.1.1

Vertical loads on account of own weight of each element shall be taken into account: conductors,
insulators, fittings, ground wires – if they exist –, poles and foundations.

4.3 Wind loads

4.3.1 Field of application and basic wind velocity

(A-dev) ES.1 RD 223/2008, ITC-LAT 07, sub-clause 3.1.2

A minimum reference wind velocity of 120 km/h (33.3 m/s) shall be considered, except in lines with
voltages of 220 kV and above, or lower voltages which are considered part of the transmission grid,
in which a minimum reference wind velocity of 140 km/h (38.89 m/s) shall be considered.

This reference wind velocity (VV) shall mean horizontal, acting perpendicular to the areas
concerned.

4.3.5 Wind forces on any overhead line component

(A-dev) ES.1 RD 223/2008, ITC-LAT 07, sub-clause 3.1.2.4

, shall be at least:
In the case of a flat surface, the wind force, QWx

2
V
 
V
Q = 100⋅ ⋅ A daN
 
Wx x
120
 

Where:

V is the reference wind velocity in km/h.
V
A is the area of the flat surface projected in a perpendicular plane to the wind direction, in
x
2
m

(A-dev) ES.2 RD 223/2008, ITC-LAT 07, sub-clause 3.1.2.5

In the case of a cylindrical surface, the wind force, QWx, shall be, at least:

2
V
 
V
Q = 70⋅ ⋅ A daN
 
Wx x
120
 

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Where:

V is the reference wind velocity in km/h.
V
A is the area of the cylindrical surface projected in a perpendicular plane to the wind
x
2
direction, in m

(A-dev) ES.3 RD 223/2008, ITC-LAT 07, sub-clause 3.1.2.1

The wind force over conductors in a suspension pole, in the transversal direction of the line, for
each conductor of the bundle shall be, at least, the following:

QWc_V = qp · d · (L1 + L2) / 2 daN

Where:

q is the wind pressure, with the following value:
p
2
V 

V
2
= 60⋅ daN/m for conductors d ≤ 16 mm
 
120
 
2
V
 
V
2
= 50⋅ daN/m for conductors d > 16 mm
 
120
 
V is the reference wind velocity in km/h.
V
d is the conductor or sub-conductor diameter, in m. In the case of combined wind and ice
load, the thickness of the ice shall be considered, for which a reference value of 7.500
3
N/m is recommended for the specific volumetric weight of ice.
L , L are the lengths of the adjacent spans, in m.
1 2

Any possible shade effects between conductors, even in the case of phase bundle conductors,
shall be neglected.

For the wind forces over poles with angle, the influence of the direction change and the lengths of
the adjacent spans shall be taken into account.

(A-dev) ES.4 RD 223/2008, ITC-LAT 07, sub-clause 3.1.2.2

The wind forces over the insulator sets shall be taken into account. The force value shall be, at
least, the following:

2
V
 
V
Q = 70⋅ ⋅ A daN
 
Wins ins
120
 

Where:

V is the reference wind velocity in km/h.
V
A is the area of the insulator set projected horizontally in a vertical plane parallel to the axis
ins
of the insulator set.

(A-dev) ES.5 RD 223/2008, ITC-LAT 07, sub-clause 3.1.2.3

The total force value of the wind over a lattice tower shall be, at least, the following:

2
V
 
V
Q = 170⋅ ⋅ A daN
 
Wt T
120
 

Where:

V is the reference wind velocity in km/h.
V
2
A is the area of the tower projected in a perpendicular plane to the wind direction, in m
T

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4.4 Wind forces on overhead line components

(snc) ES.1 Wind forces on overhead line components

Due to the use in Spain of an alternative method to define the wind forces on overhead line
components (Approach 3), the structural factors described in sub-clause 4.4 are not applicable.

4.5 Ice loads

4.5.2 Ice forces on conductors

(A-dev) ES.1 RD 223/2008, ITC-LAT 07, sub-clause 3.1.3

In Spain the ice load per length of the conductor, I (in daN pe
...