1、 60287-3-32011 3-3, ., IEC 60287-3-3:2007Electric cables Calculation of the current rating Part 3-3: Sectionson operating conditions Cables crossing external heat sources(IDT) 27 2002 . 184- , 1.02004 . 1 , - 4, -, - ()2 46 3 - 7 2011 . 255-4 60287-3-3:2007 -. . 3-3. , -. , (IEC 60287-3-3:2007 Elect
2、riccables Calculation of the current rating Part 3-3: Sections on operating conditions Cables crossingexternal heat sources). - , A5 , - . () . - , , 2012 , - - II 60287-3-320111 .12 13 14 .24.1 24.2 34.3 .44.4 5 () 6 () .10 () .11III 60287-3-32011 1 60287 . 2 , 2-1 . 2-1 , , (. 2.2.3). , , .(3-3) ,
3、 , , , , . , . , , , , . , ., .IV 60287-3-32011 . 3-3, ., Electric cables. Calculation of the current rating. Part 3-3. Sections on operating conditions.Cables crossing external heat sources 201207011 - , - . . , , , - , . : , , - .2 -: 60287 ( ) . (IEC 60287(all parts), Electric cables Calculation
4、of the current rating) ( - ).3 , 2;DF - , ( );I , ,;L , ;Lh h,;N ;T1 , Kc215/;T2 , Kc215/;T3 , Kc215/;1 60287-3-32011 T4 ( - ),K c215/;Tmh , Kc215/;T , Kc215/;Tr , Kc215/;TL , Kc215/;Wd , /;Wg , , -, 20 , /;Wh , h, /;k , ;zr ( z), , ;zmax , , ;n ;c9720 20 , K1;c98 , ;c103 , 1;c1081 ( /);c1082 ( );c1
5、14 , Kc215/;c114cr , Kc215/;c113max , ;c68c113d , , K;c68c113max - , K;c68c113(Z) () , - , z , K;c68c113(0) () , - , K;c68c113uh(z) () , h, , K;c68W , , /Kc215;c68z, , .4 4.1 , (). , , , - () , - . 1.2 60287-3-32011 1 , , , , . - . , , zmax. , , , . - DF, , :DF = 10c45c45c68c68c68c113c113c113()max d
6、1) c68c113(0) , .4.2 c68c113(0) zmax N , c68z c68c113(0) =WeeLL vzLLhzvzvlhhc114 c103c103c112c98()ln()(sin)(c68c68c68c68c45c43c43c45c45c61c22914122)( sin)c43 vzc68c98,(2)c114 ;Wh , ;3 60287-3-32011c98 ;L ;Lh . c103 c103c61 c45()1 c68WTTTLr,(3)TL=c114crA106c45,(4)Tr= T1+ n(T2+ T3+ T4), (5)T = T1+ n
7、1 + c1081)T2+(1+c1081+ c1082)(T3+ T4), (6)c68c113d= WdT12+ n(T2+ T3+ T4),(7)c68W = c68W01 c68c68c68c113c113c113()max0c45d,(8)c68W0=Rlc97c97c11320220120c43c45()max,(9)c114cr . c114cr=0,0026 Kc215/; c114cr= 0,0049 Kc215/.A ;c9720 ;I , -. 60287. c68z = 0,01 . , c103c68z 500 c68c113 0,8 25,90 34ln(1,20
8、 0,9)(1,20 0,9)19,222c215c215 c43c45c233c235c234c234c249c251c250c250c61c11213 c68W /K c215 10,64 c215 102119,265c45c230c232c231c246c248c247 = 0,0758 c103 1(1 0,075 1,88)8,671,745c45c215= 2,073 c68c113 ( ) 14,1 2K DF114,165c45 = 0,89 1 10 , 132 . 132 - 10 (. 4.4).7 60287-3-32011 .3 K 132 400 2 : 400
9、2, 132 - TLK/ c215 0,0026400106= 6,54TrK c215 / 0,835 + 3(0,09 +0,445) = 2,44 5T K c215 / 0,835 + 3 c215 1,135(0,09 + 0,445) = 2,66 6c68c113max 8525=60c68c113d2,010,8352c43c43c233c235c234c249c251c2503 009 0445(, , ) = 4,17c68W0/0,0615 10 0,00393 5851 0,00393(85 20)32c215c215 c215c43c45c45= 6,59 c215
10、 1029 - - c68z = 0,01 N 500 c68c113 0,8 37,614ln(1,2 0,9)(1,2 0,9)2ln(1,222c215c43c45c233c235c234c234c249c251c250c250c43c43c1120,9) 0,072(1,2 0,9) 0,0722222c43c45c43c233c235c234c234c249c251c250c250c236c237c239c239c238c239c239c252c253c239c239c254c239c239= 27,717 c68W /K c215 6,59 c215 1021c45c45c230c
11、232c231c246c248c24727,760 5,2= 0,0338 c1031(1 0,033 2,66) 6,52,44c45c215=1,5583 - :- - - K/ c215 K/ c215 K/ c215 0,1560,1650,174161616 c68c113(1- ) 18,6 15 c68c113 (2- -) 18,5 15 + 16 - - DF1c4518,560= 0,82 1 132 , , - 10 . 10 - 132 (. 4.4).8 60287-3-32011 , 4.4, -.4. .4 K K 300 2, , 10 0,92400 2, 132 0,859 60287-3-32011 () z c68c113(z)=c68c113uh(m c68z)+Amec103z+ Bmec45c103z(B.1) m c68z c163zc163(m +1)c68z, Am Bm
