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SEERC RWG 01 Zagreb, 23. 09. 2016. 1
MEETING STARTS AT 10.00
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3
14 CIGRE NCs covering population of 266 million * Potential of 5 new NCs with population 21 million
SEERC RWG 01 Zagreb, 23. 09. 2016.
COMPOSITION OF SEERC CIGRE RWG -01
4
MEMBERS of SEERC RWG 01 COUNTRY
Lugschitz, Reich AUSTRIA
Mirošević, Rubinić, Mihalić, Dundović, Čučić, Filipović-Grčić, Pavić CROATIA
Vertačnik, Rebolj, Starašinič, Bakič, Zadnik SLOVENIA
Posati, Berardi, Cauzillo, Emma ITALY
Petrović, SERBIA
Nemeth, HUNGARY
Bondarenko 1, Bondarenko 2, Kolomiiets, Solohub, Yandulskiy UKRAINE
Shutinoski, Trajkov, Gajdrdzjiski, Atanasoski, Nikolić, Gerasimovski MACEDONIA
SEERC RWG 01 Zagreb, 23. 09. 2016.
Presented at the first meeting (22 Sept 2016 Zagreb)
5
Present Apologized
H. Lugschitz, G. Mirošević, Z. Rubinić, K. Reich, A. Posati, P. Berardi, prof. Cauzillo
D. Mihalić, Y. Bondarenko, J. Bondarenko, R. Emma, M. Starašinič, B. Zadnik, I. Pavić,
O. Kolomiiets, O. Solohub, N. Petrović, B. Nemeth, J. Gerasimovski
S. Shutinoski, Z. Trajkov, N. Nikolić, Total: 10 from 6 countries
B. Gajdrdzijski, R. Atanasoski,
Dundović, Čučić, B. Filipovič-Grčić,
K. Bakič, B. Vrtačnik, J. Rebolj
Total: 20 from 6 countries
Meeting starts at 10.00 and finished at 14.30.
SEERC RWG 01 Zagreb, 23. 09. 2016. 6
SEERC RWG 01 Zagreb, 23. 09. 2016. 7
SEERC – REGIONAL WG 01 – STANDARDS FOR OHL's QUESTIONNAIRE DISCUSSION (Sept 2016)
-----------------------------------------------------------------------------------1. Review of experience and design practices related to Reliability of Overhead power lines 2. Review of experience and design practices related to Wind velocities and ice loads 3. Review of experience and design practices related to Electrical clearances -----------------------------------------------------------------------------------
8
Clause 3.2.2 - Table 3.1 EN 50341-1
Reliability level Return
period
T [years]
Annex B.2 Annex B.3
Wind velocity
Ice load
per conductor length
3 Nominal wind velocity V3 Nominal ice load I3 = IH
1 50 Extreme wind velocity V50 Extreme ice load I50
2 150
Extreme wind velocity VT Extreme ice load IT = IL
3 500
Q1: Reliability of Overhead power lines
Table 1 - Reliability of overhead lines
9
Q2 could be useful to improving the reliability of overhead line networks on regional level. Atmospheric icing is a general term for several types of ice accretions. Most relevant types for electrical power overhead lines are in-cloud icing (rime icing), freezing rain (glaze ice) and wet snow. (more detailed description is in CIGRE TB 291 ““Guidelines for meteorological icing models, statistical methods and topographical effects (Cigré, 2006), and ISO 12494 “Atmospheric icing” (ISO, 2001) This Survey could be broken into following parts: Part 1: Freezing rain (glaze ice) loadings as treated in design codes, standards and operational experience Part 2: Wet snow loadings as treated in design codes, standards and operational experience ----------- Part 3: Collection of specific data for glaze ice load assessments Part 4: Collection of specific data for wet snow load assessments ----------- Part 5: Restoration measures Part 6: Electrical failures due to glaze ice and wet snow Part 7: Methods used for Removal -------------------------------------------------------------------------------------------------------------------------
Q2: Wind velocities and ice loads
10
Extreme and nominal wind
velocities and ice loads EN 50341-1:2012
Clause 3.2.2 B.2 B.3
Signification Equation Reliability Wind Ice
Extreme wind velocity VT = CT V50 Def. Eq -
Nominal wind velocity V3 = C3 V50 Def. Eq -
Extreme ice load IT = gI I50 Def. - Eq
Nominal ice load I3 = YI I50 Def. - Eq
Extreme and nominal wind velocities and ice loads
11
Combined wind velocities and ice loads
Combined wind
velocities and ice
loads
EN 50341-1:2012
Clause 4.6.6 B.2 B.3
Signification Equation Comb
.
Wind Ice
Low probability wind
velocity
VIL = VT BI = (V50 W
) BI
Eq VT -
High probability wind
velocity
VIH = V3 BI or V50
W
Eq V3 -
Extreme ice load IT = I I50 Eq - IT
Nominal ice load I3 = I I50 Eq - I3
ICE LOAD - WORLD RECORD
OHL 22 kV with load 305 kg/m in Norway (April 1961) (CIGRE presentation by M.Fikke, Photo: O.Wist)
14
631 2015 Coatings for Protecting Overhead Power Network Equipment in Winter Conditions
645 2016 Meteorological data for assessing climatic loads on overhead lines
16
Ice loadings were 15 times higher than standardized values
EXAMPLE IN GERMANY on 25 November 2005
Normal value
Values in Alpen
Actual loadings on 25Nov2016
This extreme loadings caused damages: 25 km of 110/220 kV lines collapsed and 120 km of MV/LV OHLs
17
Wind and ice loads for minimum air clearances with new standard
Wind and ice loads
for minimum air
clearances
EN 50341-1:2012
Clause 5.6 4.3.5 B.3
Signification Equation Min.
air
clear.
Wind
10
min
Ice
Extreme wind load QW50 = QWx (qh/qp) X Eq -
Nominal wind load QW3 = QWx (qh /qp)
(V3/V50)2
X Eq -
Extreme ice load I50 X - Eq
18
Partial factors and combination factors for actions in the ultimate limit state
Action (Table 4.7) Partial factor for an
action
Combination
factor
Clau
se Action in the ultimate limit state Symbol Symbol
Reliability
level Symbol Value
1 2 3
Climatic loads (Variable actions):
4.3.5 Wind load on any line component QWx W 1,0 1,20 1,4 W 0,4
4.5.2 Ice load on a support from any sub-
conductor
QI I 1,0 1,25 1,5 I 0,35
4.2 Permanent loads (Permanent
actions): Self-weight
G
G
1,0
- -
4.8 Security loads (Accidental actions):
Torsional loads / Longitudinal loads
A A
1,0
- -
4.9 Safety loads:
Construction and maintenance loads*
Loads due to the weight of linesmen
QP
P
1,5
- -
The partial factors on actions mentioned above should be considered in conjunction with the partial factors on material
properties, which are defined in other clauses of this standard.
*The combination value of wind and ice actions may be taken as the actual forces likely to occur during
construction and maintenance. Frequently, the effects of wind and ice actions may be neglected.
19
Third potential survey: Q3: Electrical clearances collection by countries
• Method used, mathematical formula • Internal clearances • External clearances
• Collection of the regulations for EMF, corona noise,…
SEERC RWG 01 Zagreb, 23. 09. 2016. 20
SUGESTIONS FOR WORKING PROGRAM AND DELIVERY DOCUMENT
WP PUBLICIZE
Questionnaire: current practice against future plans
To prepare a kind of guidelines for probabilistic approach
Collection of data in region in practice as usual
All members prepare case study using examples published in EN 50341-1>2012
Next meeting in March 2017 in Macedonia – have to be confired
SEERC RWG 01 Zagreb, 23. 09. 2016. 21
Why, What, How,? What does it mean „standard“? … story from 1138 In science and technology , English word „standard“ is used with two different meanings: as a normative document and also as a measurement standard (etalon in French). Here we continue with first meaning.
Standards organizations: ISO/IEC Guide 2004 a) International: IEC (1906) b) Regional: CENELEC (1973) c) National level: SIST (2000), BS, DIN
The history of the term „standard“ First time in history term „standard“ was introduced in English language in 1138 during war between Scots and English people in famous "Battle of Standard“ near Northallerton, Yorkshire.
The current Archbishop of York, Thurstan, gathered local barons and organize militia to defense against Scotch‘s king David. Militia marched under religious banners, or standards, bearing the symbols of the patron saints of their cities, St. Peter, St. John, and St. Wilfred, respectively. It is these standards that eventually gave their name to the conflict that followed. But name was example of Italian medieval chariot „carroccio“.
Etymology description of term standard : Coined by two Goths words "standan", meaning stand and word "hardus", meaning hard.
Carroccio (by Wikipedia) become in England „standard“
23
DEFINITION OF STANDARD
Standard is document, established by consensus and approved by a recognized body, that provides, for common and repeated use, rules, guidelines or characteristics for activities or their results, aimed at the achievement of the optimum degree of order in a given context. ISO/IEC 2004, clause 3.2
Normative documents could be Standards, Technical specifications, Codes of practice and Regulations.
Technical specification prescribes technical requirements to be fulfilled by a product, process or service. NOTE1: a technical specification should indicate the procedure(s) by means of which it may be determined whether the requirements given are fulfilled. NOTE2: a technical specification may be a standard, a part of a standard or independent of standard.
Codes of practice recommends practice or procedures for the design, manufacture, installation, maintenance or utilization of equipment, structures or products. NOTE1: A Code may be a standard, a part of a standard or independent of standard.
Regulation is a document providing binding legislative rules, that is adopted by an authority.
History of rules and standards for OHLs
K. Bakič, ELES, Slovenija
- 1913… first Normative rules for OHLs
IEC – to establish TC for overhead lines
- 1919…TC 07 (Bare aluminium conductors)
- 1924…TC 11 (Overhead lines),
- 1937…TC 28 (Coordination of insulation)
- 1949…TC 36 (Insulators) and
- 1951…TC 37 (Arresters).
After 1970 starts with standards for OHLs.
Different approaches in different countries
In Slovenia from July 2014 legal act: REGULATIONS of Technical conditions for construction of overhead power lines over 1kV AC up to 400 kV. This ACT based on 4 CLC standards: SIST EN 50341-1:2002, SIST EN 50423-1:2005, SIST EN
50341-3-21:2009, SIST EN 50423-3-21:2009.
27.04.1913 – ELEKTROTECHNIK UND MACHINENBAU- Heft 17 (371)
1913 - 1988
K. Bakič, ELES, Slovenija
New CENELEC standard
NEEDS to prepare National Normative Aspects
Upgrades of old standard: Designing approach (only probabilistic
method) Impacts of wind to OHL and winter
loads (3 possibilities to define), Eurocodes with obligation, Upgrade rules for wooden poles, Upgrade rules for towers and
foundations, Considering extreme wind, Correction of electrical part
(internal/external clearances), New views to EMF in corona losses, Harmonization EN with IEC version 3 Agreement with CEN/TC 250
EN 50341-1:2012
EU level
National level
SEERC RWG 01 Zagreb, 23. 09. 2016. 27
Members of CENELES in SEERC area: Italy 29 Turkey 29 Romania 14 Hungary 12 Czech R 12 Greece 12 Austria 10 Croatia 7 Slovakia 7 FYROM 4 Slovenia 4 Total 140 weighting points
Non-members: Bosnia & Herz., Serbia, Montenegro and Ukraine.
SEERC RWG 01 Zagreb, 23. 09. 2016. 28
EN 50341-1
1 Scope
3 Basis of design
2 Normative references,
definitions and symbols
7 Supports
9 Conductors
Requirements for overhead lines Requirements for
line components
8 Foundations
10 Insulators
11 Hardware
5 Electrical requireme.
6 Earthing systems
Structural
requirements
4 Actions on lines
Annexes J - R
12 Quality
assurance, check
and taking-over
Annexes A - D
Annexes E - H
EN 50341-1:2012
Chapters and annexes
of the new standard EN 50341-1:2012
Normative annexes: E…Theoretical method for calculating minimum air clearances G…Calculation methods for earthing systems J… Angels in lattice steel towers K… Steel poles
Informative annexes: A…Strength coordination
B…Conversion of wind velocities and ice loads
C…Application examples of wind loads –special
forces
D… Statistical data for the Gumbel distribution of
extremes
F… Empirical method for calculating mid span
clearances
H… Installation and measurements of earthing
systems
L… Design requirements for supports and
foundation
M… Geotehnical and structural design of
foundation
N… Conductors and overhead earth wires
P… Tests on insulators and insulators sets
Q… Insulators and R… hardware.
251 pages
SEERC RWG 01 Zagreb, 23. 09. 2016. 29
Checklist of the format for National Normative Aspects (NNA)
To be filled up by
the NC
Item Checklist for the National Committee (NC) Yes No NA
1 First page suitable for publication
2 Head of each (even/odd) page: EN-number; page number; country
3 Contents: at least all 12 main clauses
4 Foreword: at least all 6 statements according to Annex B
5 Scope: rules of application
6 Extra definitions and extra symbols indicated
7 Definitions and symbols of the Main Body unchanged
8 List of all National Standards and Regulations
9 Unchanged headings for main clauses and subclauses
10 Clear numbering and heading for all national clauses
11 Reference to all national clauses: A-dev, snc, ncpt
12 Defined font size of letters
13 Prescribed name of Tables and Figures
14 All 12 main clauses, “Part 1 applies without change” if necessary
15 All national clauses read as amendments to the Main Body (MB),
without any duplication of MB texts and equations into the NNA
16 References to National Regulations: at least an explanatory text; a
complete text if referred to a specific national rule
NA = Not applicable
In order to facilitate the approval and the publication of its NNA, the National Committee declares
to have:
Respected the rules of the NNA format by filling up in Annex A “Checklist of the format of NNA’s”
only one case per item (16).
Country: SLO
Name:
Date: 2016
Template for Checking document NNA
How many standards is involved in EN 50341-1:2012 ?
- Eurokods: 14 std - European standards (EN): 51 std - Other (ICAO, IEC, CISPR/TR): 22 std
EN 1990:2004 EN 1991-1-4:2005 EN 1991-1-6:2005
EN 1992-1-1:2004
EN 1993-1-1:2005
EN 1993-1-3:2006
EN 1993-1-5:2006
EN 1993-1-8:2005
EN 1993-1-11:2006
EN 1993-3-1:2006
EN 1995-1-1:2004
EN 1997-1:2004 EN 1997-2:2007
EN 1998-6:2005
EN ISO 1461:2009
EN ISO 2063:2005
EN ISO 9001
EN ISO 14713
EN 1090–1:2009
EN 12385
EN 12843:2004
EN 14229:2011
EN 50182:2002
EN 50183: 2000
EN 50189: 2001
EN 50326: 2003
EN 50397-1:2007
EN 50522:2011
EN 55016-1-1:2010
EN 60038:2011
EN 60071-1:2006
EN 60071-2:2001
EN 60305:1997
IEC 60372:2004
EN 60383-1:1997
EN 60383-2:1997
EN 60433:2000
EN 60437:1998
EN 60507:2014
EN 60652:2005
EN 60794-1-1:2012
IEC 60794-1- 2 : 2014
IEC 60794-4:2004
IEC 60794-4-10:2000
EN 60865-1:2012
EN 60889:2002
EN 60909-0:2002
EN 61211:2006
EN 1232:1996/A11:2002
EN 61284:1999
EN 61325:1997
EN 61395:1999
EN 61466-1:1997
EN 61466-2:2000/A1:2004
EN 61467:2009
EN 61472:2013
EN 61773:1999 EN 61854:1999 EN 61897:1999
EN 61936-1:2011
EN 61952:2008
EN 62004:2010
EN 62219:2002
HD 474 S1:1998
ICAO Regulations –
Annex 14
IEC 60050-441:1996
IEC 60050-466:1996
IEC 60050-471:1997
IEC 60050-601:1996
IEC 60050-604:1997
IEC 60287-3-1
IEC 60471 IEC/TS 60479-1:2005 IEC/TR 60575 IEC 60720 IEC 60724
IEC 60797 IEC/TS 60815-1
IEC/TS 60815-2
IEC/TS 60815-3
IEC 60826 IEC/TR 61597 IEC/TR 61774 ISO 12494 CISPR/TR 18-2
CISPR/TR 18-3
IEC standards for Overhead lines
K. Bakič, ELES, Slovenija
IEC standard Publicated
year/edition
Title note
IEC 60826 2003 (Ed. 3) Design criteria of overhead
transmission lines (OHTL)
New version no. 4 from
2015
IEC 60652 2002 (Ed. 2) Loading tests on overhead line
structures
IEC 61284 1997 (Ed. 2) OHL – Requirements and tests
for fittings
+ corrected in1998
IEC 61773 1996 (Ed. 1) OHL – Testing on foundations for
structures
+ corrected in 1997
IEC TS 61774 1997 (Ed. 1) OHL – Meteorological data for
assessing climatic loads
IEC 61854 1998 (Ed. 1) OHL – Requirements and tests
for spacers
IEC 61865 2001 (Ed. 1) OHL – Calculation of the
electrical component of distance
between live parts and obstacles
Calculation method
IEC 61897 1998 (Ed. 1) OHL – Requirements and tests
for Stockbridge type aeolian
vibration dampers
Up to 1975 all IEC publications were titled as Recommendation and after 1975 -
Standards. After 2006 all IEC standards are added number 60.000.
I.e. 826 become 60826. So, original IEC standards have number 6xxxx and origin
CENELEC starts with 5xxxx.
IEC 60826 Ed 4.0
K.Bakič, ELES, Slovenija
Design Criteria of Overhead transmission Lines
Concept considering reliability approach:
Concept of Reliability based design of OHLs means system of partial risks of elements.
SEERC RWG 01 Zagreb, 23. 09. 2016. 33
3.2.2 Reliability level 3.2.3 Security
3.2.4 Safety
3.7.2 Structural design
resistance, Rd
3.7.2 Total design value
of the effect of actions, Ed
3.4 Action F
3.3 Limit states 3.7.1 Partial factor
method
3.3.2 ULS 3.3.3 SLS
3.5 Material property X
3.6.3 Design value of a
ma- terial property, Xd =
XK/M
3.5 Characteristic value
FK
3.6.2 Design value of an
action, Fd = F·FK
3.6.2
Partial
factor for
actions
F
Clause
4.13
Table 4.6
3.6.1 Partial factor
3.6.4 Combination value
3.6.4 Combination factor
3.6.3
Partial
factor for
material
property
M
Clause
7-11 &
EC
3.7.2 Basic design
equation
Ed Rd
3.2.1 Basic requirements
of overhead lines
3.5 Characteristic value
XK
EN 50341-1:2012
BASIS OF DESIGN
Structure of Clause 3 on the
Basis of Design
RBD (reliability based design) ENABLES BETTER ECONOMIC OPTIMIZATION.
Definition of
Reliability level
Conclusion:
Reliability level of OHL is achieved when structural design resistance is higher than considered actions due to climatic conditions (wind, ice).
Comparison of reliability levels and return periods for EN, IEC in ACSE
Reliability levels 3.2.2
Theoretical return period T considering climatic impact (in years)
1 (referent value) 50 (0,98-0,99)
2 150 3 500
EN 50341-1:2012 vs. IEC 60826:2003 vs. ASCE
ASCE Manuals on Engineering Practice no. 74: Guidelines for Electrical Transmission Line Structural Loadings (2010)
Reliability level Return period Probability for extreme wind
Factor for wind
0,5 25 0,87 0,85 1 50 0,64 1,00 2 100 0,39 1,15 4 200 0,22 1,30 8 400 0,12 1,45
Annex B 2.1 defines Return periods
SEERC RWG 01 Zagreb, 23. 09. 2016. 35
4.3.1 Basic wind velocity Vb,0
10 m above ground level
Terrain category II
Return period T = 50 years
B.2.1 Conversion factor CT
Reference height above ground h
Structural factor Gx
Wind directional factor cdir
Area of line component Ax
Orography factor co
Roughness length z0 (Terrain category table 4.1)
Air density (Altitude H)
Turbulence intensity Iv
Drag factor Cx
4.3.2 Mean wind velocity Vh
4.3.5 Wind force on any line component QWx
4.3.3 Mean wind pressure qh
4.3.4 Peak wind pressure qp
EN 1991-1-4
EN or NNA
Approach 2: Statistical meteo data: Wind velocity VT
EN or NNA
4.4 Wind force on conductor QWc , on insulator set QWins , on lattice tower panel QWt and on pole QWp
10 minutes mean wind velocity
Approach 3: NNA: Vb,0 or qp
Approach 1: Reference data EN 1991-1-4 National Annex
4.1 Three approaches to supply climatic data to determine numerical values for actions
NNA
Slovenian maps for ice loads in 2009 and 2017
SEERC RWG 01 Zagreb, 23. 09. 2016. 37
In discussion. One of the proposals in Slovenian NNA.
Ice loads considering ISO 12494 & EN 50341-1
Comparison of ice loads between some of NNAs
SLOVENIJA ro = 900
cona f Al/Fe
240/40 Al/Fe
490/65 21.9 30.6 1 1 8.3 9.8 2 1.6 13.2 15.6 3 2.5 20.7 24.4 4 5 41.3 48.8 1 1 40.9 48.4 2 1.6 48.8 56.5 3 2.5 58.8 66.8 4 5 80.2 89.3 1 1 9.5 8.9 2 1.6 13.5 12.9 3 2.5 18.5 18.1 4 5 29.2 29.4
NEMČIJA ro = 750
cona k Al/Fe
240/40 Al/Fe
490/65 21.9 30.6 1 1 7.2 8.1 2 2 14.4 16.1 3 3 21.6 24.2 4 4 28.8 32.2 1 1 41.5 48.3 2 2 54.5 61.0 3 3 64.9 71.6 4 4 73.9 80.7 1 1 9.8 8.8 2 2 16.3 15.2 3 3 21.5 20.5 4 4 26.0 25.1
FINSKA ro = 500
cona Al/Fe
240/40 Al/Fe
490/65 21.9 30.6 1 10.0 10.0 2 25.0 25.0 3 50.0 50.0 1 55.5 59.4 2 83.5 86.2 3 116.0 118.0 1 16.8 14.4 2 30.8 27.8 3 47.1 43.7
Different use of ice density.
Ice loads in Poland and Estonia for selected conductors
POLJSKA ro = 700
cona Al/Fe
240/40 Al/Fe
490/65 21.9 30.6
S1 17.5 22.3 S2 26.2 33.3 S3 34.4 41.5
S1 61.1 71.3 S2 73.0 84.3 S3 82.8 92.9
S1 19.6 20.3 S2 25.6 26.9 S3 30.4 31.1
ESTONIJA
ro = 900
cona Al/Fe
240/40 Al/Fe
490/65
21.9 30.6
1 8.8 11.3
1 41.9 50.6
1 10.0 10.0
ČEŠKA/SLOVAŠKA ro = 500
cona Al/Fe
240/40 Al/Fe
490/65 21.9 30.6
I-0 3.9 4.9 I-1 8.0 9.8 I-2 16.7 19.7 I-3 25.5 29.5 I-5 43.6 49.2 I-8 71.3 78.6
I-12 108.5 117.9 I-18 165.0 176.6
I-0 38.5 47.1 I-1 50.6 59.1 I-2 69.3 77.7 I-3 84.3 92.7 I-5 108.7 117.0 I-8 137.8 146.1
I-12 169.3 177.6 I-18 208.1 216.3
I-0 0 8.3 8.2 I-1 1 14.4 14.2 I-2 2 23.7 23.6 I-3 3 31.2 31.1 I-5 5 43.4 43.2 I-8 8 57.9 57.7
I-12 12 73.7 73.5 I-18 18 93.1 92.8
ITALIJA ro1 = 900
ro2 = ro3 = 500
cona Al/Fe 240/40 Al/Fe 490/65 21.9 30.6 1 do 600 0.0 0.0 600 19.9 24.3 1500 48.8 56.6 2 do 600 17.0 20.2 600 17.0 20.2 1500 41.4 47.0 3 do 600 0.0 0.0 600 12.9 15.6 1500 28.6 33.1 1 do 600 21.9 30.6 600 57.9 66.6 1500 86.7 95.4 2 do 600 69.9 78.6 600 69.9 78.6 1500 105.9 114.6 3 do 600 21.9 30.6 600 61.9 70.6 1500 88.9 97.6 1 do 600 0.0 0.0 600 18.0 18.0 1500 32.4 32.4 2 do 600 24.0 24.0 600 24.0 24.0 1500 42.0 42.0 3 do 600 0.0 0.0 600 20.0 20.0 1500 33.5 33.5
SEERC RWG 01 Zagreb, 23. 09. 2016. 42
What is situation with NNA available in English on CENELEC TC11 web site
Country
Germany EN 50341-2-4
Finland EN 50341-2-7
UK EN 50341-2-9
Italy EN 50341-2-13
Norway EN 50341-2-16
Sweden EN 50341-2-18
Czech Republic EN 50341-2-19
Estonia EN 50341-2-20
Slovenia EN 50341-2-21
Poland EN 50341-2-22
Slovak Republic EN 50341-2-23
SEERC RWG 01 Zagreb, 23. 09. 2016. 43
5.2 Insulation coordination
5.3 Highest system voltage
Transient overvoltages
5.4 Minimum air clearances
Theoretical
method
(§ 5.4.2)
Empirical
method
(§ 5.4.3)
Annex E
Nominal system voltage (Table
5.1)
Definitions (Table 5.2)
Table 5.6 5.5 Load cases
Table 5.3 to
5.5
5.6 Combination wind load cases / electrical stresses
(Table 5.7)
5.7 Internal clearances (at tower
top and at mid span) - Tables 5.8
and 5.9
5.8 External clearances (safety
distances) - Tables 5.10 to 5.15
Chapter 5 on the Electrical Requirements
44
Comments on chapter 5
• Completely new text for subclause 5.1
• Purpose and content of clause 5 included
• Difference internal/external clearances
• Standard reference conditions (for Tables 5.3 to 5.5)
– regarding gap configurations and altitude
– adjustment for differing conditions possible (by using Table E.5)
• Minimum air clearances determined either by:
– “Theoretical” method detailed in annex E or
– “Empirical” method (European experience)
• Limitations of clause 5
• Flowchart of the structure of clause 5
Tab. 5.1 in Standard EN 50341-1
K. Bakič, ELES, Slovenija
Nazivne napetosti
sistema Un (kV)
Najvišje napetosti
sistema Us (kV)
(kV)
Najvišja napetost
opreme (min. value)
Um (kV)
3 3,6 3,6
6 7,2 7,2
10 12 12
15 17,5 17,5
20 24 24
22 24 24
30 36 36
35 40,5 40,5
45 52 52
66 72,5 72,5
69 72,5 72,5
90
100 100
110 123 123
115 123 123
132 145 145
138 145 145
150 170 170
154 170 170
220 245 245
230 245 245
300 or 362 or 420 300 or 362 or 420
420 or 525 or 550 420 or 525 or 550
765 or 800 765 or 800
1100 or 1200 1100 or 1200
NOTE Nazivne napetosti nad 230 kV se definirajo v nacionalnih standardih.
In accordance with IEC 60038 & EN 60038
Each NNA have to define nominal system Voltage above 230 kV.
46
New structure of chapter 5
5.2 Currents
5.3 Insulation coordination
5.4 Highest system voltage
Transient overvoltages
Annex E
Nominal system voltage (Table 5.1)
5.5 Minimum air clearances
Definitions (Table 5.2)
Theoretical
method
(§ 5.5.2)
Empirical
method (§
5.5.3)
5.6 Load cases
5.7 Combination wind load cases / electrical stresses (Table 5.7)
5.8 Internal clearances (at support top
and at mid span) - Tables 5.8 and 5.9
Table 5.3 to 5.5
Table 5.6
5.9 External clearances (safety
distances) - Tables 5.10 to 5.15
