{"id":242092,"date":"2024-10-19T15:51:52","date_gmt":"2024-10-19T15:51:52","guid":{"rendered":"https:\/\/pdfstandards.shop\/product\/uncategorized\/bs-iec-60287-2-32017\/"},"modified":"2024-10-25T10:43:18","modified_gmt":"2024-10-25T10:43:18","slug":"bs-iec-60287-2-32017","status":"publish","type":"product","link":"https:\/\/pdfstandards.shop\/product\/publishers\/bsi\/bs-iec-60287-2-32017\/","title":{"rendered":"BS IEC 60287-2-3:2017"},"content":{"rendered":"

This part of IEC 60287<\/span> <\/span> describes a method for calculating the continuous current rating factor for cables of all voltages installed in ventilated tunnels. The method is applicable to any type of cable.<\/p>\n

The method applies to natural as well as forced ventilation.<\/p>\n

Longitudinal heat transfer within the cables and the surroundings of the tunnel is assumed to be negligible.<\/p>\n

All cables are assumed to be identical within the tunnel and it is assumed that the tunnel cross-section does not change with distance along the tunnel.<\/p>\n

PDF Catalog<\/h4>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
PDF Pages<\/th>\nPDF Title<\/th>\n<\/tr>\n
2<\/td>\nNational foreword <\/td>\n<\/tr>\n
4<\/td>\nEnglish
CONTENTS <\/td>\n<\/tr>\n
6<\/td>\nFOREWORD <\/td>\n<\/tr>\n
8<\/td>\nINTRODUCTION <\/td>\n<\/tr>\n
9<\/td>\n1 Scope
2 Normative references
3 Terms, definitions and symbols
3.1 Terms and definitions
3.2 Symbols <\/td>\n<\/tr>\n
11<\/td>\n4 Description of method
4.1 General description <\/td>\n<\/tr>\n
12<\/td>\n4.2 Basic formulae
4.2.1 General
4.2.2 Radial heat transfer by conduction within the cable <\/td>\n<\/tr>\n
13<\/td>\n4.2.3 Heat transfer by radiation from the cable surface to the inner wall of the tunnel
4.2.4 Heat transfer by convection from the cable surface to the air inside the tunnel
Tables
Table 1 \u2013 Fm coefficient for radiation thermal resistance calculation <\/td>\n<\/tr>\n
14<\/td>\n4.2.5 Heat transfer by convection from the air inside the tunnel to the inner tunnel wall
Table 2 \u2013 Value of parameter Kcv <\/td>\n<\/tr>\n
15<\/td>\n4.2.6 Longitudinal heat transfer by convection resulting from the forced or natural flow of air along the tunnel
4.2.7 Radial heat conduction in the soil surrounding the tunnel <\/td>\n<\/tr>\n
16<\/td>\n4.3 Set of formulae
4.4 Solving <\/td>\n<\/tr>\n
17<\/td>\n4.5 Iterative process <\/td>\n<\/tr>\n
18<\/td>\n5 Formulae for air properties
6 Temperature profile <\/td>\n<\/tr>\n
19<\/td>\nAnnex A (informative) Calculation example
A.1 Cable and installation
A.2 Calculated values
Table A.1 \u2013 Installation data <\/td>\n<\/tr>\n
20<\/td>\nTable A.2 \u2013 Iterative process for a 1 km long tunnel <\/td>\n<\/tr>\n
21<\/td>\nFigures
Figure A.1 \u2013 Temperature profile along a 1 km tunnel
Figure A.2 \u2013 Temperature profile along a 10 km tunnel <\/td>\n<\/tr>\n
23<\/td>\nAnnex B (informative) Delta-star transformation
Figure B.1 \u2013 Delta-star transformation <\/td>\n<\/tr>\n
24<\/td>\nAnnex C (informative) Calculation of Fm coefficient
C.1 Definition of spacing
C.2 Calculation of Fm coefficient
Figure C.1 \u2013 Spacing definitions
Table C.1 \u2013 Expression for Fm coefficient calculation <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":"

Electric cables. Calculation of the current rating – Thermal resistance. Cables installed in ventilated tunnels<\/b><\/p>\n\n\n\n\n
Published By<\/td>\nPublication Date<\/td>\nNumber of Pages<\/td>\n<\/tr>\n
BSI<\/b><\/a><\/td>\n2017<\/td>\n26<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":242096,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[493,2641],"product_tag":[],"class_list":{"0":"post-242092","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-29-060-20","7":"product_cat-bsi","9":"first","10":"instock","11":"sold-individually","12":"shipping-taxable","13":"purchasable","14":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product\/242092","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media\/242096"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=242092"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=242092"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=242092"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}