OVERHEAD DESIGN MANUAL

Size: px

Start display at page:

Download "OVERHEAD DESIGN MANUAL"

Samuel Webster
5 years ago
Views:

1 OVERHED DESIGN MNUL Section Cable Data pproved by: F. ZINI ENERGEX 2015 MNUL 00302

3 CLE SELECTION CLE INSULTED CONDUCTORS GUIDELINES For use: in the vicinity of vegetation (present or future) where there is a likelihood of objects falling or blowing onto the mains, eg tree branches, chains where wildlife may otherwise cause outages where mains are likely to be contacted by crane jibs, boat masts or other objects where there is minimal clearance from structures. Note that clearing profiles for HVC are significantly smaller than for CCT. C ll-aluminium conductors are recommended for stringing tensions up to and including T110. These have excellent conductivity and since their weight is low, the tensions upon structures are moderate. C can suffer from annealing when subjected to excessive heat, eg due to overloading or cane fires. CSR luminium conductors with galvanized steel reinforcing are recommended for stringing tensions of T110 and above. CSR is stronger than C, but has inferior conductivity. CSR conductors are typically used in rural applications where spans are very long and electrical loads are light. CSR is more prone to corrosion in polluted environments than C, particularly where salt spray is present. NOTE: Due to rising fault levels consult Protection Department for application of Raisin within 12km of a substation. HDC ND SC/GZ Hard drawn copper and steel (galvanized) conductors are obsolete and would normally only be specified for sleeving of short sections onto existing mains. THR ORIGINL ISSUE COPYRIGHT 2015 ENERGEX in part or whole without written UTHR F. ZINI K.GOSDEN CLE DT CLE SELECTION GUIDELINES

4 ELECTRICL RTINGS OF CONDUCTORS STNDRD NOMINL RTINGS (in mps) FOR ENERGEX CIRCUITS - Category Circuits = Single Circuits, Sub-circuits & Super -circuits with Skip Poles - Category Circuits = Super-circuits without Skip Poles = Summers Day 55 Deg C Design 75 Deg C Design W/N = Winters Night Cat Cct s Cat Cct s Cat Cct s Cat Cct s TR = llowable Temperature Rise (above ambient) Conductor CSR/GZ - IMPERIL CSR/GZ - METRIC (Emrg) W/N ll Year (Emrg) Ref Table TR ( C) W/N ll Year Max Conductor Temperature ( C) (WN)-0(SD) (WN)-110(SD) 3/4/.03 K URR /1/.118 FERRET /1/.144 MINK /1/.161 RCOON / /.062 DOG /7/.102 WOLF /7/.118 PNTHER /7/.132 ER /7/.146 GOT /7/.132 CMEL /4/2.50 RISIN /1/3.00 PPLE /1/3.75 NN / /1.60 CHERRY /7/2.50 GRPE /7/3.00 LEMON /7/3.25 ORNGE THR ORIGINL ISSUE COPYRIGHT 2015 ENERGEX in part or whole without written UTHR F. ZINI K.GOSDEN CLE DT ELECTRICL RTINGS

5 STNDRD NOMINL RTINGS (in mps) FOR ENERGEX CIRCUITS - Category Circuits = Single Circuits, Sub-circuits & Super -circuits with Skip Poles - Category Circuits = Super-circuits without Skip Poles = Summers Day 55 Deg C Design 75 Deg C Design W/N = Winters Night Cat Cct s Cat Cct s Cat Cct s Cat Cct s TR = llowable Temperature Rise (above ambient) Conductor HRD DRWN COPPER - IMPERIL HRD DRWN COPPER - METRIC C - IMPERIL CCT (C) - METRIC C METRIC (Emrg) W/N ll Year (Emrg) Ref Table TR ( C) W/N ll Year Max Conductor Temperature ( C) (WN)-0(SD) (WN)-110(SD) 7/.064 7/ /.080 7/ /.104 7/ /.136 7/.136Cu /.064 1/ / / /.083 1/ /.101 1/.101Cu /.104 1/ /2.75 COPPER /.118 GRU /.134 FLY / / /.173 WSP / / / / /4.75CCT 120 CCT Values for an 80 C Conductor Temp THR ORIGINL ISSUE COPYRIGHT 2015 ENERGEX in part or whole without written UTHR F. ZINI K.GOSDEN CLE DT ELECTRICL RTINGS

6 STNDRD NOMINL RTINGS (in mps) FOR ENERGEX CIRCUITS - Category Circuits = Single Circuits, Sub-circuits & Super -circuits with Skip Poles - Category Circuits = Super-circuits without Skip Poles = Summers Day 55 Deg C Design 75 Deg C Design W/N = Winters Night Cat Cct s Cat Cct s Cat Cct s Cat Cct s TR = llowable Temperature Rise (above ambient) Conductor C 6201 METRIC C METRIC STEEL (Emrg) W/N ll Year (Emrg) Ref Table TR ( C) W/N ll Year Max Conductor Temperature ( C) (WN)-0(SD) (WN)-110(SD) 7/3.00 LIR /3.75 MRS /4.75 MOON /3.25 NEPTUNE /3.75 PLUTO /4.75 TURUS /3.00 STURN /3.75 GRNET /3.00 RUY /3.75 HELIUM /4.75 IODINE /3.75 NEON /4.75 OXYGEN /3.00 NITROGEN /12 3/.104 STEEL /12 7/.104 STEEL Notes: Category circuits are standard lines designed for 75 C operation (or 55 C for certain older lines designed prior to 180). Category circuits are HV (mostly 33kV) lines designated for high temperature operation for increased current rating, having similar current ratings for both Summer Day and Winter Night conditions. These lines may operate up to 110 C (or 0 C for older lines) under summer day conditions. The planning group may provide advice as to which feeders are classified as Category. lternatively, information may be obtained from the Equipment Rating (ERT) Database custodian. THR ORIGINL ISSUE COPYRIGHT 2015 ENERGEX in part or whole without written UTHR F. ZINI K.GOSDEN CLE DT ELECTRICL RTINGS

7 Code Name Metric (mm/mm 2 ) Stranding/rea Imperial (Inches/Gauge) MECHNICL PROPERTIES STNDRD DISTRIUTION CLES Nom. Overall Dia. (mm) Cross- Sectional rea (mm 2 ) Min. reaking Load (kn) Mass (kg/m) Modulus of Elasticity (GPa) Coefficient of Linear Expansion (/ C x 10-6 ) are C LIR 7/ MRS 7/ MOON 7/ PLUTO 1/ are CSR PPLE 6/1/ NN 6/1/ RISIN 3/4/ Insulated/Covered LVC5 4 x 5 C HVC35 3 x 35 C + 1 x 60 GZ (catenary) HVC120 3 x 120 C + 1 x 60 GZ (catenary) Pilot 20 Pair Muticore /2.00 GZ 42.0 (Catenary (Catenary Wire) (Catenary Wire) (catenary) Wire) Other DSS 72 CORE (Post 2017) CCT 120mm 2 CCT 120mm 2 OPGW 62mm 2 OPGW 65mm 2 (Pre 2017 Cable) OPGW 115mm 2 7/4.75 C /4.75 C /3.35 CS 4/3.35 2/3.7 CS 4/3.7 8/2.26 CS 11/ (Catenary Wire) THR 01/06/17 P Relf Sht 1 data updated to include latest Pilot, DSS and OPGW cable data. COPYRIGHT 2017 ENERGEX in part or whole without written UTHR F. ZINI K. GOSDEN CLE DT MECHNICL PROPERTIES T 4 1

8 MECHNICL PROPERTIES STNDRD DISTRIUTION CLES Code Name Metric (mm/mm 2 ) Stranding/rea Imperial (Inches/Gauge) Nom. Overall Dia. (mm) Cross- Sectional rea (mm 2 ) Min. reaking Load (kn) Mass (kg/m) Modulus of Elasticity (GPa) Coefficient of Linear Expansion (/ C x 10-6 ) Service Cables x 25 C x 25 C x 25 C x 35 C x 6 HDC are C THRIP 7/ GNT 7/ JUPITER 7/ LOCUST 7/ GRU 7/ FLY 7/ / WSP 7/ MERCURY 7/ / / / / STURN 37/ are C (lloy 1120) IODINE 7/ OXYGEN 1/ THR 01/06/17 P Relf Sht 1 data updated to include latest Pilot, DSS and OPGW cable data. COPYRIGHT 2017 ENERGEX in part or whole without written UTHR F. ZINI K. GOSDEN CLE DT MECHNICL PROPERTIES T 4 2

9 MECHNICL PROPERTIES STNDRD DISTRIUTION CLES Code Name Metric (mm/mm 2 ) Stranding/rea Imperial (Inches/Gauge) Nom. Overall Dia. (mm) Cross- Sectional rea (mm 2 ) Min. reaking Load (kn) Mass (kg/m) Modulus of Elasticity (GPa) Coefficient of Linear Expansion (/ C x 10-6 ) are CSR FERRET 6/1/ MINK 6/1/ RCOON 6/1/ DOG 6/.186+7/ CHERRY 6/4.75+7/ WOLF 30/7/ LEMON 30/7/ PNTHER 30/7/ ER 30/7/ GOT 30/7/ CMEL 54/7/ KOOKURR 3/4/ are Copper 7/.064 (7/16) /.080 (7/14) /.104 (7/12) / / /.064 (1/16) / /.083 (1/14) /.101 (1/12) / /.064 (37/16) / /.083 (37/14) / /.103 (37/12) THR 01/06/17 P Relf Sht 1 data updated to include latest Pilot, DSS and OPGW cable data. COPYRIGHT 2017 ENERGEX in part or whole without written UTHR F. ZINI K. GOSDEN CLE DT MECHNICL PROPERTIES T 4 3

10 MECHNICL PROPERTIES STNDRD DISTRIUTION CLES Code Name Metric (mm/mm 2 ) Stranding/rea Imperial (Inches/Gauge) Nom. Overall Dia. (mm) Cross- Sectional rea (mm 2 ) Min. reaking Load (kn) Mass (kg/m) Modulus of Elasticity (GPa) Coefficient of Linear Expansion (/ C x 10-6 ) Cadmium-Copper 7/ / are Steel 3/.104 (3/12) /.104 (7/12) / / /.080 (1/14) / THR 01/06/17 P Relf Sht 1 data updated to include latest Pilot, DSS and OPGW cable data. COPYRIGHT 2017 ENERGEX in part or whole without written UTHR F. ZINI K. GOSDEN CLE DT MECHNICL PROPERTIES T 4 4

11 RODND COMMUNICTION CLE (CC) IDENTIFICTION TELSTR Where multiple circuits are present, Telstra take the bottom position. Earthing of catenary is via a driven stake near the base of a wood pole. OPTUS Where multiple circuits are present, Optus take the top position. Earthing of the catenary is via the ENERGEX neutral. Cantilever brackets may be present. Power supply units are clearly marked and are small shoe box sized units. Fibre optic cables are underground, ie no overhead fibre Power supply units are clearly marked and are larger than Telstra Units. Overhead fibre optic cables are present in ENERGEX s area of supply. These are indicated by: Figure of eight configurations, Cables that continue straight through the expansion loops. Lashing wire is generally terminated within the expansion loop. Service drops are taken from service T hooks at the pole. These hooks may be present even though no service is attached. Lashing wire is generally terminated outside the expansion loop area. Service drops may be attached either at the pole or in-line (flying fox). Usually it is only Optus that employs in-line service arrangements. Note: Refer Shared ssets Installations Manual 712-4, for further detail. THR ORIGINL ISSUE COPYRIGHT 2015 ENERGEX in part or whole without written UTHR F. ZINI K. GOSDEN CLE DT RODND COMM S CLE ID

ENGINEERING CKGROUND MECHNICL PROPERTIES Nominal or projected diameter is of relevance when determining cable behaviour under wind conditions. Insulation, if present, is included.

12 ENGINEERING CKGROUND MECHNICL PROPERTIES Nominal or projected diameter is of relevance when determining cable behaviour under wind conditions. Insulation, if present, is included. Cross-sectional area is important in determining the cable strength, weight and potential elastic stretch. Where a cable has a supporting catenary, only the cross-sectional area of the catenary is included. Current-carrying conductors and insulation, if present, are excluded. Mass determines the amount of sag within a span strung at a given tension, or conversely the amount of tension applied to the supports by a line with a given sag. Minimum breaking load is the ultimate tensile strength of the cable. In general, conductor tension should not exceed 50% of breaking load, even under wind conditions or cold conditions. Modulus of elasticity is a measure of stress or load applied to a material to cause a given strain (deformation or stretch). Coefficient of Linear Expansion is the degree to which a cable expands in length as temperature increases. This determines the relationship between sag/tension and temperature. CLE DESIGNTIONS Cables may be known by: code name, eg MOON, which represents 7/4.75 C Stranding and material, eg 7/4.75 C. Here the 7 is the number of strands and the 4.75 is the strand diameter in millimetres. For older imperial conductor sizes, the diameter may be expressed in terms of inches (eg 7/.104 ) or as a standard wire gauge (eg 7/12 ). The smaller the wire gauge number, the larger the diameter. CSR conductors have a more complex designation because of the combination of materials, eg RISIN is designated 3/4/2.50, having 3 strands of aluminium and 4 strands of galvanized steel, all with a 2.5mm diameter. Nominal cross-sectional area, eg LVC5 (5mm 2 LVC) or CCT120 (120mm 2 covered conductor with added insulation thickness). This is used primarily with insulated conductors and cables. Note that actual cross-sectional area may differ slightly from nominal cross-sectional area. 37/3.00 C (STURN) 3.00 mm 7/3.00 C (LIR) 30/7/3.00 CSR (LEMON) LVC F. ZINI CLE DT ENGINEERING CKGROUND THR ORIGINL ISSUE COPYRIGHT 2015 ENERGEX in part or whole without written UTHR K. GOSDEN

Which expression gives the elastic energy stored in the stretched wire?

1 wire of length L and cross-sectional area is stretched a distance e by a tensile force. The Young modulus of the material of the wire is E. Which expression gives the elastic energy stored in the stretched