输电线路试题

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293ஹ220kV?ᵯuᨵJwxl᫏K᫏Xn400m,lwAZwBᚖlc=12m,ᙠᨬᜧLcᩩ-¢£¤¥89.21X10—3N/Lc஺0=132MPa஺o>ᙠᨬᜧLcᩩ-¢lwḄLc஺AஹoBo4ஹ@ᵨ±oX-4.5´Kᵨµ✂K=130cm3¸¹⊤☢஺¸¹»K20࠷µ½Ḅ¾¿mn0.000723Á¸¹ÂK20࠷ÃÄu¾¿mn0.0136஺rT⊤☢ÆS=645cm2஺>⊤☢È5ஹrTᢞwxlὊËÌḄ´ÍnLGJT85,Ò⊤᫏Xn50m,~ᚖn0.8m,@ᵨÓÔ~ᚖÕÓÔ12%⊡ØḄᛛឋÛ஺Gᙠ᫏Xn60mḄXYᑁÝt~ᚖ}஺>~ᚖnÔLÞßà6ஹJ3᧕â5᝞ãD-29(a)ᡠèKéê6m,ᐸ5n2000N஺AìᵨíîïðKBìᵨñòóôKõöe÷ø5ᱥᐳ510000N,ᙠãèûüa=2mKo>ñòḄócpýþAḄÿ஺D-29(a)7ஹᩩ220kV᫏£=400m,Ὂ!"Ḅ$⊤᫏£np=390mm,)Ḅ*+,ᦪ0=19X10—6,3ᚖ/'=70!,89:;t=20࠷஺>?:;@40࠷9Ḅᨬᜧ3ᚖ/inaxE஺8ஹ᝞D-24ᡠIᙢKḄLM@0.25m,PQ@1.8m,RS@1.6m஺᝞ᡠIᙢKTUᔣWXYUᔣḄᜳ[a=45°,]^Ḅ_`ᙷb[@30°,ᓫdefy=1800kg/nAj

30ᐰ,ᦪl2஺_`ᙢKḄᐕnᢙb஺D-249ஹᩚᛞḄrᙢstuᵨXYrᙢwᙊyrᙢz{P@20m,LMd=10mm,]^ᵯ~᳛0=150஺஺_`rᙢstḄ⚣rᙢᵯ~ᶍ,ᦪᑨᔲᔠ⌕>_`9RS=0.6m9rᙢᵯ~ᜧ15Q,@ᔠ⌕>ᔲᑣᡷᑖ஺10ஹ¡ᨵ᪷19¤ஹ70mm2Ḅ╄¦y§ᵨ¨©ª@«¬jᐰ®`╄¦y§Ḅ¯7b±ᨬᜧᐕn¯²axᔜ´µ¶I·19¤y§¸§,ᦪ/.=0.89,ᵨ©ª9ᐸjᐰ,ᦪᝰ»¼2.5,᩽▲ᢙ¯¿Q஺=1370N/mm211ஹ220kVÁÂᩚᩚÃ23m,ᓫdPQᵯÄ@0.42aH/m,)YᙳÃQ@1.2m,Ç©ªὃ⇋ᵯ᧿ËḄ὚ᔠ,ᦪ@0.2,ÍᩚᛞrᙢstḄÎÏrᙢᵯ~@6.5Q,ÐÑÒÓḄ50%ÎÏÕÖᵯ×@1198.5kV஺>ḄὊªXY஺ὃ⇋©ªḄᑖبᵨ12ஹÙᵯḄ$⊤᫏@250m,ᨬᜧÚÛÜÝPÞmax/2=13.55m,ᨬ²ÚÛÜÝPÞmin/2=1.21m,ßàjsá■Ú┴஺ßà■Ú┴jsä஺13ஹHOkVæ10kVᙠèéæêë£=20mdtjìíîï810kVð[@28°ஹllOkVð[@34°,ᑨèéæêᔠ⌕>14ஹᙠᵯ,ò_`9ὃ⇋óôᦔ»§ᐭ,ᦪ20࠷9÷Ḅᵯ~᳛uᵨ0=31.5Q-mm2/km஺_`50࠷91kmPḄLGJ-240Â)Ḅᵯ~E஺÷Ḅᵯ~;Q,ᦪ@஺=0.00356

3115ûᨵüý¯ᩚþ᪀᝞
DTOᡠஹஹᐹG=500kg,ᩚᩚ!"஺$%&ACஹBC*+,-?ᜧ0᝞+1
D-1016ஹᨵ789:500kVḄ=>?@ABC7BDᢙ:300QḄHIJKLᩭNOPQᙢᵯD:10஺ḄQᙢTUᐭᙢ஺WQᙢTUXḄᵯYZ[QᙢTUḄᵯ\ᔜ:^_117ஹa220kVcᵯdef0ghij⌕lᐸnopq:1.6cm/kV஺vᱏX-4.5zḄnoq{:290mm஺$}~Ḅᱏᦪ஺18ஹa7dὊᨵ᫏qᑖ:஻=190mஹZ2=200mஹZ3=210mஹ/4=220m!ὃ⇋ᢞḄ஺lὊ⊤᫏q஺19ஹadᵨLGJ-70zᐸ-7P:19417N,£ᐰ¥ᦪ4=2.5,"¦§☢n79.3mmlḄᨬᜧªᵨ«-஺20ஹallOkVdḄᵯᩚ:®ᩚᓫe?°ᵯ±:8.4X10—4஻H/m,OPQᙢᵯD:7Qᵯᩚᐰ:19.5m஺´ᨵ789:26kAஹBµ:2.6¶·ḄKᵯ\@Pᩚ⚔¹\Nᩚºlᩚ⚔ᵯe஺21ஹaὊ᝞
D-4ᡠ»᫏q஻=250m,Z2=260m,Z3=240m«$l2#ᩚḄ¾᫏q஺

32
D-422ஹ᝞
D-3ᡠ¿ÀÁᩚḄ?°/=15m,ÁᩚḄ᪷Ã4=8m,Äᛞ*-ÁᩚÆÇ◍É0=0.2m,ÊË᦮ÍÁᩚÎᙢ☢ᜳA0=60°஺$"¦Áᩚ⚔Ñᑮᙢ☢Ḅᚖ@ᨵᦔ°Õ23ஹÖᣚaὊ:LGJT50z஺$ئ7ÇᦈÚÛᐹ◤Ý*^ᜧḄ-஺ÞßḄ«-஺=98MPa24ஹa7dâÛᵨã?äåæçᚖÞßḄçᚖ:6.25m,ᙠAᩚXéê°ëqᢞq{:a=4m஺$lᙠBᩚX«ᢞê°ë^_ì125ஹÞßadçᚖåæ᫏7ÑíµÎᢞq{a:1.5m,î7í:Îᢞq{6:5m஺$lïåæ᫏çᚖᴸ26ஹa7dὊᨵ᫏qᑖ:஻=190mஹZ2=200mஹ/3=210mஹ£4=220m!ὃ⇋ᢞḄ஺lὊ⊤᫏q஺27ஹᵨNòóæíqÞßXôõᦪa=2.78m,Çôõᦪ6=1.66m஺ö÷øí¾ùíqúᦪ4=100஺lNòóæûüæýḄ¾q{¿

3328ஹ᝞
D-18ᡠÞßþÿḄᔠᦔ᳛ᑖᑏᓣ᝞ᱥ஺ᡠ◤ஹ/2Ḅ஺29ஹ2-2!"#2000kgḄᱥ'ᱫ)*ᵫ,!)'ᵫ-./ᱫ)஺0ᓣ1ᱥᡠ◤2345ᓫ!78ᦔ᳛995%,!Ḅᔠᦔ᳛஻=90%஺@30ஹ12!"#2000kgḄᱥ0,ᱫ)*ᵫC!)'ᵫ-./ᱫ)஺0ᓣ1ᱥᡠ◤ᓄ345ᓫ!78ᦔ᳛995%,!Ḅᔠᦔ᳛஻=90%஺@31ஹ᝞ED-32ᡠG'ᵨIJ*"#ᵯᩚ'MᐰOᦪQ4.5,,₹OᦪU=1.3,Vᙳ⊝OᦪA2Z1,ᵯᩚḄ[932=1500kg஺\]ᔲᵨẚ`7b=68kNḄIJ*"#஺ED-32

3432ஹfghᵨLGJ-70lmf'ᐸmfop`919417N,mfḄMᐰOᦪ4=2.5,mfq☢s979.Bmm:0mfḄᨬᜧyᵨz஺33ஹ45LGJT85lmfḄop`7b=64kN,q☢S=216.76010?mfḄMᐰOᦪ-2.5஺\0mfḄᐕz஺஺34ஹᣚὊ'mf9LGJT50l஺\ᦈmfp7ᐹ◤ᜧḄ஺345mfḄz஺=98MPa@35ஹHOkVfg᫏'ᐸ᫏/=350m,⊤᫏£np=340m,¡¢£fg¤᫏ᩚᛞḄ¦§¨©=100m஺ᙠ«¬20࠷p®¯°mf±ᚖ/'=5m,mf´¡fgḄµ¶¨96m,mf·¸¹Oᦪ0=19X10—6஺\¼¬½940Cp'µ¶¨¿ᔲÀÁ⌕0Ã36ஹὊÄÅÆ95698.5m,⊤᫏9258m,ÇÈ᫏᫏9250m,É®±ᚖ95.84m,Ê᯿¼p«¬Ḅ̱ᚖÍ93.98m஺\01ὊÄḄfÆÎ᦮[஺37ஹ500kVÐᵯfg'Ñfᩚᐳ28ᱏXPT6l஺ÌÔᨬÕÖ×ᵯØ9ÙCᵯØḄ1.1Ú'28ᱏXPT6lḄ7⚣ÜÝᵯØ3ᨵᦔÍ@91025kV,27ᱏXPT6lḄ7⚣ÜÝᵯØ3ᨵᦔÍ@9988.4kV஺\ᢥᑁáØ⌕0âᐸ¦§஺38ஹ220kVfg'ãlᩚᩚÕ23m,ᓫäƽᵯå90.42/m,mf§ᙳÕ½91.2m,æçèfὃ⇋ᵯ᧿ìḄ὚ᔠOᦪ90.2,îᩚᛞïᙢñòḄóôïᙢᵯõ96.5Q,Ḅ50%óôÝ÷ᵯØ91198.5kV஺01fgḄὊ覧஺3Vὃ⇋çèfḄᑖø8ᵨ@39ஹ220kVÐᵯfg'äù0úûüý'⌕0ᐸþÿ
1.6cm/kV஺ᱏX-4.5Ḅ
290mm஺!"#Ḅᱏᦪ஺40ஹ&'()*+,-)*ᨵ7010232.0mm,+*ᨵ28010232.3mm஺⌱8-᪗:;☢஺

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36ஹ⚪A1ஹv?ᔜᑖᔁஹḄ⌕ᑁᨵ?2ஹ^8-ஹ-LᚖḄ⌕ᨵ3ஹᵨᬪ-ᜳtḄ¡-¢£ᔠ?¥-¦sᐰ¨¡-©ª«¬®᦮1¢£ᔠ4ஹsᵯ±-²ᨵ³´⌕5ஹ8-Ḅµ¶·᝞¹º»Ḅ?¼s¥½-²ᨵ¹¾¿6ஹÀ±¥-Ḅ³´ᱯÂᨵ?ᐸᨵ¹Äg7ஹ᝞¹©ªÅb³ẠḄᑖᙷÈ8ஹÉᵯ-²ÊË⌕■?-ᙠ■ÍÎÏh¹Èᵨ9ஹÐÑ?ᢣḄ·ÊËᔜ⊤NÊË10ஹÊË11OkVÔÕÖᵯr×ᵯØ(ÙÚᵨÏឋg2ttᙢ"11ஹVÜ!ᚖ#ᨵ⌕12ஹᙠᩚᛞÖÈ¢ÞVᐰßv13ஹ〈ᵯ-²ḄáᡂÔᔜ¨ᑖḄÈᵨ஺14ஹ^8-ஹ-LᚖḄ⌕ᨵ?

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59/^A+M=5+7=12(m):ABCḄZ[12m\]^_[16m஺(0.5ᑖ)2ஹ8VA£=-(^-/72)(m)1)*31aA/bcId᦮f(m)g/2b^$hᚖ(m);kblmhᚖ(m)gb᫏8(m)஺8,,AAL=--------(0.82-1.22)^-0.036(m)3X60ᓽ*op᫏hᚖqᑮ^$scIdt0.036m஺u*cI◤dt0.036nlyz{⌕@஺3ஹ)*ᢥ⚪}@)᝞஺(1)cIᨬ᫏8Ḅ89஻ᒹ=132X12=44.39(m)gl89.21X10(2)ZஹZ᫏Ḅ᫏8ᑖZA=1+2/77=400+2X44.39=488.78(m)ZB=l-2/=400—2X44.39=311.22(m)(3)ZஹᙠZ᫏8Ḅhᚖᑖ_g_89.211()7x488.78?“b8X132^20.18(m)f=gt=89.21X1O~3X311.2228%^8.18(m)8X132(4)ᙠᨬᜧᩩ¢ZஹᑖoA=o0+g/A=132+89.21X10-3X20.18^133.8(MPa)oB=஺0+9=132+89.21X10-3X8.18Pl33.73(MPa)

60u*ᙠᨬᜧᩩ¢ZஹḄᑖ133.8MPa§132.73MPa஺4ஹ)*ᢥ⚪}@)ᨵ©ª஺"(4b¬S(3ᑖ)130X(0.0136-0.000723)/ஹ=10X----------------------------------=0.026(mg/cm)645(2ᑖ)u*®¯⊤☢²³s0.026mg/emo5ஹ)*ᢥ⚪}@)µ/1="/£0)2/0(2ᑖ)=(60/50)2X0.8=1.15(m)(0.5ᑖ)·¸¹º»Ihᚖ¼½¾ᑖᦪ12%,ᡠÂ.,./=/1(1-12%)=1,15X0.88=1.01(m)(1ᑖ)u*hᚖ1.01mÃÄ
I஺(0.5ᑖ)6ஹ)*Â᫡ẆÇÈÉ᝞ÉD-29(b)ᡠÌÍÎ☢bÏÎ஺ÉD-29(b)ᑡ⊝ÒᵫX"M(9=0,µWsin30°-G(AB/2)—P(AB-=0஺ᑖ)7X6X0.5-2000X(6/2)-10000X(6—2)=0(1ᑖ)7=15333(N)

61ᵫFy=0,µ;fex-7cos300=0O0.5ᑖQ.•.ᾦx=13278ONQO0.5ᑖQᵫXy=0,Ahy+7sin30°-G--0O0.5ᑖQ/fey+15333X0.5—2000-10000=0O0.5ᑖQᾯy=4334ONQN»=NX+N=V132782+43342=13967,4N
O1ᑖQu*¸áḄâ15333N,ãäAḄå13967.4N஺)*ᢥ⚪}@)µ+æ-"max—aO2ᑖQ=449+23.98=8.54m
஺ᑖQu*çè40࠷Ḅᨬᜧhᚖ8.54m஺8ஹ)*+,*d=0.25m,7=1.8mZ?=1.6m,a=45°£=30°,=1800kg/mK=2,f=/?/sin450=1.6/0.707=2.263OmQ1ë4Q=-JLr+J+z
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62««11007.3OkgQ«107.87kNOlᑖQu*ᙢîḄᐕðᙷòø107.87kN஺9ஹ)*ᢥ⚪}@)µ2EhdO3ᑖQ150in2°22X3.14X200.6X0.01OiᑖQ=13.3O஺QO1ᑖQ13.3Q<15஺O1ᑖQu*ûüḄýᙢᵯÿᔠ⌕஺10ஹᢥ⚪᝞஺1Ḅ7b=4஺f0.5ᑖ=70X1370X0.890.5ᑖ=85.351kN0.5ᑖ7—Tb—85.351_&x—)----
------34.14kN
2ᨬᜧᐕ/K252ᑖ0╄2Ḅ85.351kN,ᨬᜧᐕ/34.14kN஺1ᑖ11ஹᢥ⚪%#+%ᓝ'E3ᑖ1198.5^101kA
042X236.5+^6+53ᑖ06ḄὊ89:lOlkA஺12ஹ

63>?@AS=~AmaxB/J2~2m.inB/C2'4"max/'2+1Dumi.n/'2/„3ᑖ/i\13.55X1.21=l.Um
13.55+1.212ᑖ0EFG■I┴>?@A1.11m஺1ᑖ13ஹᢥ⚪LMNOᚖQ@A/?=£tg82-tg஺13ᑖ=tg34°—tg28°X202ᑖ—2.86mV3m1ᑖ0LMNOᚖQ@A[\3m,]ᔠ⌕஺14ஹᢥ⚪^_R=p-El+a50-20
S3ᑖ=31.5X1/240Ll+0.0035650-20a2ᑖ=0.145Q1ᑖ01kmcḄLGJ-240fg50࠷iᵯkl0.145Q஺15ஹACnᩚpᵨC=G/sin30°1ᑖ=500/sin3001ᑖ=1000kgf=9800N1ᑖBCvwpx/•BC=G/tg30°1ᑖ=500/tg30°1ᑖ=866.03kg=8487.05N0nᩚpBvᩚpBᐸpᜧ[ᑖ{9800Nஹ8487.05N«16ஹ

64ᢚ~ᵯx2C/Z_2X500X10O24==32.26kV
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ᢚ~ᵯ2Z2,103ᑖ0ᙢ?Ḅᵯx32.26kV,ᵯ3.23kA஺17ஹᵫ\/3ᑖᡠ“250/%=1.6X220/29.0=12.14ᱏ2ᑖ▭13ᱏ1ᑖ0Ḅᱏᦪ13ᱏ஺18ஹὊ⊤᫏@ᒹ஺2ᑖ1903+2003+2103+2203m190+200+210+2200Ὂ⊤᫏@205.9m஺gḄẚ¡¢oP=7P/S2ᑖ=19417/79.3=244.85MPa2ᑖ%=©=244.85/25gᨬᜧ¨ᵨ¢mK=97.94MPa2ᑖ0gḄᨬᜧ¨ᵨ¢97.94MPa஺20ஹ

654d=/Rch+ªᘊ=)ஹ+•••at^(4ᑖ)®¯dFᩚ⚔ᵯ±(kV)²8ᵯ³l(kA)²£0Fᩚᛞᓫ±cᵯ¶(uII/m)²-ᩚ·(m);T1—8ᵯ¸¸¹(us)஺,.ad=26X7+0.84X19.5X26/2.6(1ᑖ)=345.8(kV)0ᩚ⚔ᵯ±345.8kV஺21ஹ,ºᩚ9:᫏@—:+2h2®£1ஹ£2—2#ᩚᛞ»¼᫏@(m)஺².2#ᩚḄ9:᫏@,L[+L,2(3ᑖ)250+26022ᑖ=255(m)(1ᑖ)02#ᩚ9:᫏@255m஺22ஹ4="?_¾/2)2¿ᑖ):Àᩚᨵᦔ·Ãh=L'Sin60°F=,15?-4?sin60°-0.22ᑖ=12.32(m)(1ᑖ)0Àᩚ⚔Æᑮᙢ☢ḄᚖQᨵᦔ·Ã12.32m஺23ஹ6=஺5(4ᑖ)

66=98X150=14700N2ᑖ0ᦈÊgËÌᐹ◤ÏpḄM700N஺24ஹᢥ⚪B_=—3ᑖ"=2".ᑘஹᑖ=2V^25-42=9m1ᑖ0ᙠBᩚ¢ᢞÕÃÖ9m஺25ஹᢥ⚪ײ&+ᕣ3ᑖ=²Ú+ÛÜ2ᑖ=2.99m1ᑖ0ÝÞ᫏ßᚖà2.99m஺26ஹὊ⊤᫏@IZL3"஺2ᑖ,+c+4"\L|+A+L+L2342ᑖ/1903+2003+2103+2203V190+200+210+2202ᑖ0Ὂ⊤᫏@205.9m஺27ஹQ/a-6=100Xফ78—1.663ᑖ=H2m2ᑖ09:@A112m஺

6728ஹᢥ⚪஺(1):•ᨴḄᱫèéᵫêëìèíBëîᦪ஻=3QQp==.ðᑗ£(3ᑖ)(2)ḄᱫèéᵫòëìèíBëîᦪ"=3_Q_QP,2(஻+D஻Ìô(3ᑖ)-_Q__Q_p-Q-QP=0ᡠ◤õö÷ᑖ{'"/3%i2(஻+1ᑗ£4".29ஹøùëîᦪ஻=4,úᱫèéᵫòëîèíBᡠûᵨ÷2X9.8P2ᑖ_2000X9.85X0.90ᑖ)-4355.56(N)(1ᑖ)0ýᓣÿᱥᡠ◤-4355.56N஺30ஹᦪ஻=3,ᵫ!"ᡠ#$ᵨ&'()_0X9.8஻஻.3ᑖ02000X9.8=7259.26.N03X0.9.3ᑖ034ᓣ67ᱥᡠ◤(7259.26N஺31ஹᡠ9(T=&K,:;1~mcosa.2ᑖ0=.1.3X1.2X1/cos30°0•[.9.8X15000/2]

68=13240.N0.1ᑖ0ḄᐕG.2ᑖ0Hᑐ=m/4=68/4.5=15.l.kN0=15100N.lᑖ0V7=132^

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350=1.224.m0.0.5ᑖ0.30z40࠷nYZZḄᚖ/f=6—l.224=4.776.m0.0.5ᑖ03(4.776m,ᜧḄᨬ3m,⌕g஺.0.5ᑖ036ஹ᪷¡¢᫏ḄZ¤¥᦮&'h)ᘽ4&©0“k.2ᑖ03«¬X=0.259.-18.2650=—4.73.m0.0.5ᑖ03ᓽ\ᦈm4.73m஺.0.5ᑖ037ஹᢥ⚪fg᝞s஺.1027ᱏ¯°±²³ᵯ´£27.¶·0(t/=988.4XV2=1397.8kV
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