STNW3014 Standard for Busbar Design - Ergon Energy

1 Joint Standard Document between Energex and Ergon Energy Energex Limited ABN 40 078 849 055 Ergon Energy Corporation Limited ABN 50 087 646 062 Substation Standard Standard for Busbar Design These standards created and made available are for the construction of Energy Queensland infrastructure. These standards ensure meeting of Energy Queensland s requirements. External companies should not use these standards to construct non- Energy Queensland assets. If this Standard is a printed version, to ensure compliance, reference must be made to the Energy Queensland internet to obtain the latest version. Approver Carmelo Noel If RPEQ sign off required insert details below.

2 Energy Queensland Certified Person Name and Position Registration Number John Lansley Engineering Manager Substation Standards RPEQ 6371 (Electrical) Paul De Sousa Roque Senior Line Structure Engineer RPEQ 10013 (Mechanical) Abstract: This Standard provides guidance on the selection of Busbar type and application. Keywords: Busbar , Conductor, Connection, Support, Insulator, Standard for Busbar Design Check this is the latest version before use ii EX 02050 Ver 4 EE STNW3014 Ver 4 Joint Standard Document between Energex and Ergon Energy Energex Limited ABN 40 078 849 055 Ergon Energy Corporation Limited ABN 50 087 646 062 For definitive document version and control detail, please refer to the information stored on the Process Zone.

3 Document approvals Name Position title Signature Date Carmelo Noel GM Asset Standards John Lansley Manager Substation Standards Stakeholders / distribution list Name Title Role Standard for Busbar Design Check this is the latest version before use iii EX 02050 Ver 4 EE STNW3014 Ver 4 Joint Standard Document between Energex and Ergon Energy Energex Limited ABN 40 078 849 055 Ergon Energy Corporation Limited ABN 50 087 646 062 Table of Contents 1 Overview .. 1 Purpose .. 1 2 References .. 1 Energy Queensland controlled documents .. 1 Other documents .. 1 3 Legislation, regulations, rules, and codes .. 2 4 Definitions, acronyms, and 3 Definitions .. 3 Acronyms and abbreviations.

4 3 5 General procedure .. 4 6 Design requirements .. 4 7 Evaluation of conductor size for current rating .. 4 Basic data and Standard conditions .. 4 Skin effect .. 7 Proximity effect .. 7 Corona inception voltage .. 7 Rating tables for Standard sizes of busbars .. 7 8 Rigid Busbar mechanical Design .. 9 Loads on rigid Busbar and support insulators .. 10 Permanent loads .. 10 Exceptional loads .. 10 Busbar mechanical data .. 10 Basic data .. 10 Busbar mechanical strength .. 11 Support insulator mechanical strength .. 11 Evaluation of natural frequency .. 11 Busbar end supports .. 12 Maximum Busbar span length based on allowable vertical deflection.

5 12 Maximum Busbar span lengths based on conductor allowable fibre stress .. 12 Maximum Busbar span length based on insulator cantilever strength .. 13 9 Documentation required .. 14 Annex A Formulae and assumptions for calculation of conductor current ratings .. 15 Formulae Used .. 15 Standard for Busbar Design Check this is the latest version before use iv EX 02050 Ver 4 EE STNW3014 Ver 4 Joint Standard Document between Energex and Ergon Energy Energex Limited ABN 40 078 849 055 Ergon Energy Corporation Limited ABN 50 087 646 062 Continuous current rating (I) .. 15 Power dissipation due to radiation of 1 meter of conductor (PR) .. 15 Power dissipation due to convection of 1 meter of conductor (PC).

6 15 Power gained through solar radiation of 1 meter of conductor (PS) .. 17 AC Resistance of 1 meter of conductor (R) .. 18 Combined proximity effect and skin effect .. 18 Calculation of corona onset .. 20 Conductor corona onset gradient .. 20 Conductor maximum voltage gradient .. 20 Three phase single conductors .. 20 Three phase bundle conductors .. 21 Short time current rating .. 22 Annex B Busbar mechanical strength and maximum span length calculations .. 23 Data used in calculation of maximum span lengths .. 23 Maximum span length based on allowable deflection .. 25 Simple-simple end supports (Lvss) .. 25 Simple-fixed end supports (Lvsf) .. 25 Busbar maximum cantilever span based on allowable deflection (Lvc).

7 26 Maximum span length based on conductor allowable fibre stress .. 26 Simple-simple or simple-fixed end supports (LSs) .. 26 Maximum Busbar cantilever length based on allowable fibre stress .. 27 Total load acting on the Busbar conductor (FT) .. 27 Combined Busbar and anti-vibration conductor gravitational weight (FGtotal)27 Wind load on Busbar (Fw) .. 28 Short-circuit mechanical load on Busbar (Fsc) .. 28 Maximum span length based on end insulators torsional strength (Lb) .. 29 Maximum span length based on insulator cantilever strength (Le) .. 29 Maximum Busbar spans with exceptional short-circuit current and X/R values .. 30 Thermal Expansion Load.

8 39 Thermal Expansion ( L) .. 39 Load due to thermal expansion (FTE) .. 39 Annex C Wind Induced Vibration and Resonance .. 40 General .. 40 Annex D Standard palm terminal sizes and current rating .. 42 Standard for Busbar Design Check this is the latest version before use Page 1 EX 02050 Ver 4 EE STNW3014 Ver 4 Joint Standard Document between Energex and Ergon Energy Energex Limited ABN 40 078 849 055 Ergon Energy Corporation Limited ABN 50 087 646 062 1 Overview Purpose This Standard provides the current ratings and mechanical limits of outdoor, air insulated busbars to be adopted within Energy Queensland. This Standard also details methods of calculating their thermal ratings and determining mechanical loads on conductor and support insulators.

9 2 References Energy Queensland controlled documents Document number or location (if applicable) Document name Document type (NA000000R100) Plant Rating Guidelines Ergon Energy Guideline Energex Plant Rating Manual Energex Guideline (STNW3013) Substation Standard Clearances in air Energy Queensland Substation Standard Other documents Document number or location (if applicable) Document name Document type (AS/NZS , 2002) (Standards Australia) Structural Design actions. Part 0: General principles Standard (AS/NZS , 2011) (Standards Australia) Structural Design actions. Part 2: Wind actions Standard (AS 1531, 1991) (Standards Australia) Conductors Bare overhead Aluminium and aluminium alloy Standard (AS/NZS , 1997) (Standards Australia) Aluminium Structures Part 2.

10 Allowable stress Design Standard (AS 1746, 1991) (Standards Australia) Conductors - Bare Overhead - Hard-drawn Copper Standard (AS 2067, 2016) (Standards Australia) Substations and high voltage installations exceeding 1 kV Standard (AS , 1996) (Standards Australia) Insulators Ceramic or glass Station post for indoor and outdoor use Voltage greater than 1000 V Standard (AS , 2012) (Standards Australia) Common specifications for high voltage switchgear and controlgear standards Standard (AS , 2005) (Standards Australia) High voltage switchgear and controlgear Part 301: Dimensional standardization of terminals Standard (IEC 60287-1-1, 2014) (IEC) Electric cables calculation of current rating Part 1-1: Current rating equations Standard Standard for Busbar Design Check this is the latest version before use Page 2 EX 02050 Ver 4 EE STNW3014 Ver 4 Joint Standard Document between Energex and Ergon Energy Energex Limited ABN 40 078 849 055 Ergon Energy Corporation Limited ABN 50 087 646 062 (100% load factor) and calculation of losses - General (IEC 60865-1 , 2011) (IEC) Short-circuit Currents - Calculation of Effects - Part 1.