MADCAD.com - The Cloud-Based Reference Library

- Free Trial - Webinar - Feedback

Cart (0)

No items in cart.

Total

There is a technical issue about last added item. You can click "Report to us" button to let us know and we resolve the issue and return back to you or you can continue without last item via click to continue button.

Home

Content

eLibrary

Not a subscriber? Register for a trial account.

Username:
Password:

Incorrect username/password.

Already a subscriber?

MADCAD.com Free Trial

Sign up for a 3 day free trial to explore the MADCAD.com interface, PLUS access the
2009 International Building Code to see how it all works.

If you like to setup a quick demo, let us know at support@madcad.com
or +1 800.798.9296 and we will be happy to schedule a webinar for you.

Email *
Password *
Confirm *
First Name *
Last Name *
Title
Company Name *
Company Size *
Industry *
Address *
Address 2
City *
State *	Zip *
Country *
Phone *
How did you hear about MADCAD.com? *

Contact us for a custom quote

Please fill the form below and a member of our staff will contact you shortly. The contents of your cart will automatically be sent to us so we can provide an accurate custom quote.

Company*
Full name*
Email*
Phone

⨯To continue with accurate pricing,
please select your company type below:

Large goverment organizations

Large multi-national corporation (more than $5B annual revenue)

None of the above

Your company has a special pricing case for IEEE.
For pricing, please contact us by filling out the form.

Full name*
Email*
Phone
Your selection

⨯We need your input!

Are you a code official in a jurisdiction with less than 300,000 population?

Yes No

This item is only available for the code officials of jurisdictions less then 300K population.

If you do not meet the criteria item will be removed and you will be able to continue shopping other items.

⨯ We need your input!

Your company has a special pricing case for ASME.
Please make sure the information you provide below is accurate.

Company Industry
Number Of Employees
Revenue

Pricing for the ASME publications in the store is for a 1-4 employee company in Construction Industry with revenue under $500,000.
If correct company info does not match what is publicly available info we will suspend the access and contact you for correction.
Please call 1-800-798-9296 if you have any questions.
If your company has more than 5,000 employee or more than 500 mil revenue please email us at info@madcad.com to receive a special quote, use "ASME Quote" on the subject line.

⨯We need your input!

Are you an existing Madcad user?
If so, please login to continue with the free items in your cart.

Yes No

eLibrary > BS IEC 60826:2017 Overhead transmission lines. Design criteria >

BS IEC 60826:2017 Overhead transmission lines. Design criteria, 2017

30247213-VOR.pdf [Go to Page]
CONTENTS
FOREWORD
1 Scope
2 Normative references
3 Terms, definitions, symbols and abbreviations [Go to Page]
3.1 Terms and definitions
3.2 Symbols and abbreviations
4 General [Go to Page]
4.1 Objective
4.2 System design
4.3 System reliability
5 General design criteria [Go to Page]
5.1 Methodology [Go to Page]
5.1.1 General
5.1.2 Reliability requirements
5.1.3 Security requirements
5.1.4 Safety requirements
5.2 Load-strength requirements [Go to Page]
5.2.1 Climatic loads
5.2.2 Design requirements for the system
5.2.3 Design formula for each component
6 Loadings [Go to Page]
6.1 Description
6.2 Climatic loads, wind and associated temperatures [Go to Page]
6.2.1 General
6.2.2 Field of application
6.2.3 Terrain roughness
6.2.4 Reference wind speed VR
6.2.5 Assessment of meteorological measurements
6.2.6 Determination from gradient wind velocities
6.2.7 Combination of wind speed and temperatures
6.2.8 Number of supports subjected in wind action, effect of length of line
6.2.9 Unit action of the wind speed on any line component or element
6.2.10 Evaluation of wind loads on line components and elements
6.3 Climatic loads, ice without wind [Go to Page]
6.3.1 Description
6.3.2 Ice data
6.3.3 Evaluation of yearly maximum ice load by means of meteorological data analysis
6.3.4 Reference limit ice load
6.3.5 Temperature during icing
6.3.6 Loads on support
6.4 Climatic loads, combined wind and ice loadings [Go to Page]
6.4.1 General
6.4.2 Combined probabilities – Principle proposed
6.4.3 Determination of ice load
6.4.4 Determination of coincident temperature
6.4.5 Determination of wind speed associated with icing conditions
6.4.6 Drag coefficients of ice-covered conductors
6.4.7 Determination of loads on supports
6.5 Loads for construction and maintenance (safety loads) [Go to Page]
6.5.1 General
6.5.2 Erection of supports
6.5.3 Construction stringing and sagging
6.5.4 Maintenance loads
6.6 Loads for failure containment (security requirements) [Go to Page]
6.6.1 General
6.6.2 Security requirements
6.6.3 Security related loads – Torsional, longitudinal and additional security measures
7 Strength of components and limit states [Go to Page]
7.1 General
7.2 General formulas for the strength of components [Go to Page]
7.2.1 General
7.2.2 Values of strength factor ΦN
7.2.3 General basis for strength coordination
7.2.4 Strength factor ΦS related to the coordination of strength
7.2.5 Methods for calculating strength coordination factors ΦS
7.3 Data related to the calculation of components [Go to Page]
7.3.1 Limit states for line components
7.3.2 Strength data of line components
7.3.3 Support design strength
7.3.4 Foundation design strength
7.3.5 Conductor and ground wire design criteria
7.3.6 Insulator string design criteria
Annexes [Go to Page]
Annex A (informative) Technical information – Strength of line components [Go to Page]
A.1 Calculation of characteristic strength
Annex B (informative) Formulas of curves and figures [Go to Page]
B.1 General
B.2 Formula for Gc – Figure 4
B.3 Formula for GL – Figure 5
B.4 Formula for Gt – Figure 6
B.5 Formula for Cxt – Figure 8 (flat-sided members)
B.6 Formula for Cxt – Figure 9 (round-sided members)
B.7 Formulas for Cxtc – Figure 10
Annex C (informative) Atmospheric icing [Go to Page]
C.1 General
C.2 Precipitation icing [Go to Page]
C.2.1 Freezing rain
C.2.2 Wet snow
C.3 Dry ice
C.4 In-cloud icing
C.5 Physical properties of ice
C.6 Meteorological parameters controlling ice accretion
C.7 Terrain influences [Go to Page]
C.7.1 In-cloud icing
C.7.2 Precipitation icing
C.8 Guidelines for the implementation of an ice observation program
C.9 Ice data [Go to Page]
C.9.1 Influence of height and conductor diameter
C.9.2 The effect of icing on structures
C.10 Combined wind and ice loadings [Go to Page]
C.10.1 Combined probabilities
C.10.2 Drag coefficients of ice-covered conductors
Annex D (informative) Application of statistical distribution functions to load and strength of overhead lines
Annex E (informative) Effect of span variation on load-strength relationship – Calculation of span use factor [Go to Page]
E.1 General
E.2 Effect of use factor on load reduction and its calculation
Annex F (normative) Conductor tension limits [Go to Page]
F.1 General
F.2 Limits for lines with short spans
F.3 Recommended conductor limit tensions [Go to Page]
F.3.1 Initial tension limit
F.3.2 Maximum final tension limit
F.4 Benefits from reducing conductor tensions
Annex G (informative) Methods of calculation for wind speed up effects due to local topography [Go to Page]
G.1 Application
G.2 Notes on application
Bibliography
Figures [Go to Page]
Figure 1 – Diagram of a transmission line
Figure 2 – Transmission line design methodology
Figure 3 – Relationship between meteorological wind velocities at a height of 10 m depending on terrain category and on averaging period
Figure 4 – Combined wind factor Gc for conductors for various terrain categories and heights above ground
Figure 5 – Span factor GL
Figure 6 – Combined wind factor Gt applicable to supports and insulator strings
Figure 7 – Definition of the angle of incidence of wind
Figure 8 – Drag coefficient Cxt for lattice supports made of flat sided members
Figure 9 – Drag coefficient Cxt for lattice supports made of rounded members
Figure 10 – Drag coefficient Cxtc of cylindrical elements having a large diameter
Figure 11 – Factor Kd related to the conductor diameter
Figure 12 – Factor Kh related to the conductor height
Figure 13 – Typical support types
Figure 14 – Equivalent cylindrical shape of ice deposit
Figure 15 – Simulated longitudinal conductor load (case of a single circuit support)
Figure 16 – Diagram of limit states of line components
Figure C.1 – Type of accreted in-cloud icing as a function of wind speed and temperature
Figure C.2 – Strategy flow chart for utilizing meteorological data, icing models and field measurements of ice loads
Figure G.1 – Diagram of typical topographical cross-section
Tables [Go to Page]
Table 1 – Reliability levels for transmission lines
Table 2 – Default γT factors for adjustment of climatic loads in relation to return period T versus 50 years
Table 3 – Design requirements for the system
Table 4 – Classification of terrain categories
Table 5 – Factors describing wind action depending on terrain category
Table 6 – Correction factor τ of dynamic reference wind pressure q0 due to altitude and temperatures
Table 7 – Drag coefficient of polygonal pole sections
Table 8 – Drag coefficient of structures having a triangular section
Table 9 – Statistical parameters of ice loads
Table 10 – Non-uniform ice loading conditions
Table 11 – Return period of combined ice and wind load
Table 12 – Drag coefficients of ice-covered conductors
Table 13 – Additional security measures
Table 14 – Number of supports subjected to maximum load intensity during any single occurrence of a climatic event
Table 15 – Strength factor ΦN related to the number N of components or elements subjected to the critical load intensity
Table 16 – Values of ΦS2
Table 17 – Typical strength coordination of line components
Table 18 – Damage and failure limits of supports
Table 19 – Damage and failure limits of foundations
Table 20 – Damage and failure limits of conductors and ground wires
Table 21 – Damage and failure limit of interface components
Table 22 – Default values for strength coefficients of variation (COV)
Table 23 – u factors for log-normal distribution function for e = 10 %
Table 24 – Value of quality factor ΦQ for lattice towers
Table A.1 – Values of ue associated to exclusion limits
Table C.1 – Physical properties of ice
Table C.2 – Meteorological parameters controlling ice accretion
Table C.3 – Approximate values of ice weights on lattice structures
Table C.4 – Combined wind and ice loading conditions
Table C.5 – Drag coefficients and density of ice-covered conductors
Table D.1 – Parameters C1 and C2 of Gumbel distribution
Table D.2 – Ratios of x / for a Gumbel distribution function, T return period in years of loading event, n number of years with observations, vx coefficient of variation
Table E.1 – Use factor coefficient γu
Table F.1 – Variation of conductor sag with catenary parameter C
Table F.2 – Conductor tensioning – recommended catenary parameter limits
Table G. 1 – Values of μ and γ [Go to Page]

MADCAD.com Free Trial

Report To Us

Contact us for a custom quote

⨯To continue with accurate pricing,
please select your company type below:

⨯We need your input!

⨯ We need your input!

⨯We need your input!

⨯We need your input!

Cart Warning

BS IEC 60826:2017 Overhead transmission lines. Design criteria, 2017

MADCAD.com Free Trial

Report To Us

Contact us for a custom quote

⨯To continue with accurate pricing, please select your company type below:

⨯We need your input!

⨯ We need your input!

⨯We need your input!

⨯We need your input!

Cart Warning

BS IEC 60826:2017 Overhead transmission lines. Design criteria, 2017

⨯To continue with accurate pricing,
please select your company type below: