ICS29.240

P62

RecordNumber：J2864-2020

ELECTRICPOWERINDUSTRYSTANDARDOFTHEPEOPLESREPUBLICOFCHINA

P

DL/T5582-2020

CodeforElectricalDesignofOverhead

TransmissionLine

架空輸電線路電氣設(shè)計(jì)規(guī)程

IssuedonOctober23，2020ImplementedonFebruary1，2021

IssuedbyNationalEnergyAdministrationELECTRICPOWERINDUSTRYSTANDARDOF

THEPEOPLESREPUBLICOFCHINA

CodeforElectricalDesinofOverhead

g

TransmissionLine

/

DLT55822020

：

ChiefDevelomentDeartmentElectricPowerPlanninand

ppg

EngineeringInstitute

：

ArovalDeartmentNationalEnerAdministration

pppgy

：，

ImplementationDateFebruary12021

ChinaPlanninPress

g

Beiin2024

jgChineseeditionfirstpublishedinthePeoplesRepublicofChinain2020

EnlisheditionfirstublishedinthePeolesReublicofChinain2024

gppp

bChinaPlanninPress

yg

rd

，，

4FloorCTowerGuohonBuildin

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，，

No.A11Muxidi-BeiliXichenDistrict

g

，

Beijing100038

jp

PrintedinChinabyBeijinghouchengzeming

，

PrintinTechnoloCo.Ltd

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?2024byNationalEnergyAdministration

Allrihtsreserved.Noartofthisublicationmabereroducedor

gppyp

，，，，

transmittedinanformorbanmeansrahicelectronicormechanical

yyygp

，，

includingphotocopyingrecordingoranyinformationstorageand

，

retrievalsstemswithoutwrittenermissionoftheublisher.

ypp

，

Thisbookissoldsubjecttotheconditionthatitshallnotbywayof

，，，

tradeorotherwisebelentresoldhiredoutorotherwisecirculated

withouttheublishersriorconsentinanformofblindinorcover

ppyg

otherthanthatinwhichthisispublishedandwithoutasimilarcondition

includingthisconditionbeingimposedonthesubsequentpurchaser.

ISBN978-7-5182-1731-1Table10.3.5-2Min.crossinverticalclearancesbetween±800kVor±1100kVlinesandarailwa，hihwa，river，ie，cablewaorvariousoverheadlines（m）

gygyppy

Polarconductorte

yp

±1100

±800kV

kV

Item

/

8×1250

6×630/456×720/506×800/556×900/406×1000/456×1125/506×1250/708×900/408×1250/70

70

1000m2000m3000m1000m2000m3000m1000m2000m3000m1000m2000m3000m1000m2000m3000m1000m2000m3000m1000m2000m3000m1000m2000m3000m1000m2000m3000m1000m

Torailtop21.022.523.021.022.023.020.521.522.520.021.022.019.520.521.519.020.021.018.519.520.518.019.520.516.017.519.028.5

Railway

Tobearingcable

15.015.516.014.515.015.514.014.515.014.014.515.013.514.015.013.514.014.513.013.514.513.013.514.512.512.513.519.5

orcontactline

HighwayToroadsurface21.022.523.021.022.023.020.521.522.520.021.022.019.520.521.519.020.021.018.519.520.518.019.520.516.017.519.028.5

Tobridgedeckor

staffoeration

p

platformofvessels15.015.516.014.515.015.514.014.515.014.014.515.014.014.015.014.014.015.014.014.014.514.014.014.514.014.014.019.5

Navigableatthemax.

rivernavigationlevel

Tothemasthead

atmax.navigation10.510.510.510.510.510.510.510.510.510.510.510.510.510.510.510.510.510.510.510.510.510.510.510.510.510.510.513.0

level

Floodlevelwitha

100-yearreturn12.512.512.512.512.512.512.512.512.512.512.512.512.512.512.512.512.512.512.512.512.512.512.512.512.512.512.515.0

Innaviable

g

eriod

p

river

Toicesurface

18.019.019.518.019.019.518.018.519.517.518.519.017.018.019.017.017.518.516.017.018.016.017.018.014.515.517.025.0

inwinter

Telecomm-

unicationTocrossedobject16.017.017.516.017.017.516.016.517.515.516.517.015.516.017.015.016.016.514.515.516.014.515.516.013.014.015.022.0

line

Tocrossedobect10.510.510.510.510.510.510.510.510.510.510.510.510.510.510.510.510.510.510.510.510.510.510.510.510.510.510.513.0

j

Powerline

Tooleto15.015.516.014.515.015.514.014.515.014.014.515.013.514.015.013.514.015.013.013.514.513.013.514.512.512.513.519.5

pp

Special

Toieline16.017.017.516.017.017.515.516.517.015.516.017.015.516.017.015.016.016.514.515.516.014.515.516.013.014.015.022.0

pp

ies，

pp

Tocablewa10.510.510.510.510.510.510.510.510.510.510.510.510.510.510.510.510.510.510.510.510.510.510.510.510.510.510.513.0

y

cableways

：

Notes1BasedonhorizontalVinsulatorstringforconductor.

，

2Whenthelinecrossesanareawherearailroadbridgeistobeconstructedtheoperationofrailwaybridgegirdererectionmachineshallalsobeconsidered.

3Highervoltagelinesshallbestringedabovelowervoltagelines.

，，

4Forcrossingsinheavyicingareasthesagincreaseshallbecheckedconsideringuneveniceloadandchecktheverticalclearancetothecrossedobject.

，

5Whenflood-fightingandemergencyrescuevesselsaretobeconsideredforthemaximumfloodleveltheverticalclearanceshallbedeterminedbyconsultation.Introduction

，

ThisEnglishversionwhosetranslationwasorganizedby

，

ElectricPowerPlanninandEnineerinInstituteauthorizedb

gggy

NationalEnerAdministrationofthePeolesReublicofChina

gypp

，

incompliancewithrelevantproceduresandstipulationsisoneof

ChinasenergyindustrystandardsinEnglishseries.ThisEnglish

versionwasublishedbNationalEnerAdministrationofthe

pygy

〔〕，

PeolesReublicofChinainAnnouncement2024No.2dated

pp

，

May242024.

TheEnlishversionwastranslatedfromtheChinese

g

StandardCodeorElectricalDesinoOverheadTransmission

fgf

/

LineDLT55822020publishedbyChinaPlanningPress.

ThecorihtisownedbNationalEnerAdministrationof

pygygy

thePeolesReublicofChina.Intheeventofandiscreancin

ppypy

，

theprocessofimplementationtheChineseversionshallprevail.

Manythankswouldgotothestafffromrelevantstandard

develomentoranizationsandthosewhohaverovided

pgp

enerousassistanceinthetranslationandreviewrocess.

gp

，

ForfurtherimprovementoftheEnglishversionall

commentsandsuestionsarewelcomeandshouldbe

gg

addressedtoElectricPowerPlanninandEnineerin

ggg

，，，

Institute.No.65AndeRoadXichengDistrictBeijingPostal

：，：

Code100120China.Websitewww.e.

pp

··

1：

Translatinoranization

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，

EastChinaElectricPowerDesinInstituteCo.Ltd.of

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ChinaPowerEngineeringConsultingGroup

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Translatinstaff

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，，，

WENZuomingYANGGuangyaoXUEChunlin

，，，

YUANZhileiQIANGuanzhonWANGZiinDING

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Reviewanelmembers

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LIYonshuanChinaElectricPowerPlanninand

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EngineeringInstitute

CHENGuanNortheastChinaElectricPower

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DesinInstituteCo.Ltd.ofChina

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PowerEngineeringConsultingGroup

WUGaoboCentralSouthernChinaElectric

，

PowerDesignInstituteCo.Ltd.

ofChinaPowerEnineerinConsultin

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Grou

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JIANGYueNorthwestChinaElectricPower

，

DesinInstituteCo.Ltd.ofChina

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PowerEngineeringConsultingGroup

LIUJionSouthwestChinaElectricPower

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，

DesinInstituteCo.Ltd.ofChina

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PowerEngineeringConsultingGroup

SHIFanNorthChinaElectricPowerDesin

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，

InstituteCo.Ltd.ofChinaPower

EngineeringConsultingGroup

WANGJiniChinaEnerEnineerinGrou

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GuangdongElectricPowerDesign

··

2，

InstituteCo.Ltd.

YANJianxinPowerConstructionCororation

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ofChinaHebeiElectricPower

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EnineerinCo.Ltd.

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LIYanPowerConstructionCororation

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ofChinaShanghaiElectricPower

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EnineerinCo.Ltd.

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··

3翻譯出版說明

本譯本為國家能源局委托電力規(guī)劃設(shè)計(jì)總院按照有關(guān)程序

，。

和規(guī)定統(tǒng)一組織翻譯的能源行業(yè)標(biāo)準(zhǔn)英文版系列譯本之一

，。

年月日國家能源局以年第號(hào)公告予以公布

202452420242

本譯本是根據(jù)中國計(jì)劃出版社出版的《架空輸電線路電氣設(shè)

計(jì)規(guī)程》/—翻譯的，著作權(quán)歸國家能源局所有。

DLT55822020

在使用過程中，如出現(xiàn)異議，以中文版為準(zhǔn)。

本譯本在翻譯和審核過程中，本標(biāo)準(zhǔn)編制單位及編制組有關(guān)

。

成員給予了積極協(xié)助

為不斷提高本譯本的質(zhì)量，歡迎使用者提出意見和建議，并

反饋給電力規(guī)劃設(shè)計(jì)總院。

地址：北京市西城區(qū)安德路號(hào)

65

郵編：

100120

：

網(wǎng)址

：

本譯本翻譯單位

中國電力工程顧問集團(tuán)華東電力設(shè)計(jì)院有限公司

本譯本翻譯人員：

溫作銘、楊光耀、薛春林、袁志磊、錢廣忠、王子瑾、丁仲輝。

本譯本審核人員：

李永雙電力規(guī)劃設(shè)計(jì)總院

陳光中國電力工程顧問集團(tuán)東北電力設(shè)計(jì)院有限公司

吳高波中國電力工程顧問集團(tuán)中南電力設(shè)計(jì)院有限公司

江岳中國電力工程顧問集團(tuán)西北電力設(shè)計(jì)院有限公司

劉炯中國電力工程顧問集團(tuán)西南電力設(shè)計(jì)院有限公司

··

1施芳中國電力工程顧問集團(tuán)華北電力設(shè)計(jì)院有限公司

汪晶毅中國能源建設(shè)集團(tuán)廣東省電力設(shè)計(jì)研究院有限公司

閆建興中國電力建設(shè)集團(tuán)河北省電力勘測(cè)設(shè)計(jì)研究院

有限公司

李艷中國電力建設(shè)集團(tuán)上海電力設(shè)計(jì)院有限公司

··

2NationalEnerAdministration

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Announcement

〔〕

2020No.5

NationalEnerAdministrationaroved502ener

gyppgy

industrstandardsincludintheTechnicalCodeorReal-

ygf

TimeEcologicalFlowMonitoringSystemsofHydropower

（），

ProectsrefertoAppendix1and35Englishversionof

j

enerindustrstandardsincludintheSeriesParametersor

gyygf

（）（

HorizontalHdraulicHoistClinderrefertoAendix

yypp

），

2anditisherebypublished.

：

Aendix1.Listofrofessionalstandards

ppp

（）

2.ListofrofessionalstandardsEnlishversion

pg

NationalEnergyAdministration

，

October232020

··

1：

Aendix1

pp

Listofprofessionalstandards

StandardStandardRelacedReferencePublishedArovalImlementation

pppp

No.

codeNo.namestandardstandardNo.bydatedate

…

Codefor

ElectricalDesinChina

g

/

DLT2020-2021-

471ofOverheadPlanning

5582202010-2302-01

TransmissionPress

Line

…

··

2Foreword

Accordingtotherequirementsofthe＂Noticeofthe

NationalEnerAdministrationonIssuinthe2015Ener

gyggy

（）（〔〕

IndustryStandardsCompilingRevisePlan＂GNKJ2015

），

No.283thecomilinrouhascarefullsummarizedChinas

pggpy

exerienceinelectricaldesinofoverheadtransmissionline

pg

，，

throughin-depthinvestigationresearchcalculationandanalysis.

Ithasconductedcomrehensiveandsstematicreviewand

py

integrationofthematureprovisionsofexistingstandardsof

，

transmissionlineandenineerinexeriencereferredtorelevant

ggp

，

internationalstandardsandthelatestresearchresultssolicited

opinionsextensivelyandformulatedthisstandardaccordingly.

：

Themaintechnicalcontentsofthisstandardinclude

，，，

generalprovisionstermsandsymbolsroutingmeteorological

，，，

conditionsconductorandearthwireinsulationcoordination

，，

Lihtninrotectionandroundininsulatorsandfittins

ggpggg

，

arrangementofconductorandearthwirecrossingandground

，，

clearanceaccessoriesetc.

ThisstandardismanagedbytheNationalEnergy

，

AdministrationandroosedbElectricPowerPlanninand

ppyg

EnineerinInstitute.TheTechnicalCommitteeofGrid

gg

DesignStandardizationofEnergyIndustryisresponsiblefor

，

dailmanaementandElectricPowerPlanninand

ygg

EngineeringInstituteisresponsiblefortheinterpretationof

··

1secifictechnicalcontent.Ifouhaveancommentsor

pyy

，

suestionsleasesendthemtotheManaementCenterfor

ggpg

（：，

StandardizationofEPPEIAddressNo.65AndeRoad

，，，：

XichenDistrictBeiinP.R.ChinaPostalCode100120.E-

gjg

：_）

mailbzzhongxin@.

：

Chiefdevelomentoranizations

pg

ElectricPowerPlanninandEnineerinInstitute

ggg

，

EastChinaElectricPowerDesignInstituteCo.

Ltd.ofChinaPowerEnineerinConsultinGrou

gggp

SouthwestChinaElectricPowerDesignInstitute

，

Co.Ltd.ofChinaPowerEnineerinConsultin

ggg

Grou

p

：

Particiatindevelomentoranizations

pgpg

NorthwestChinaElectricPowerDesinInstitute

g

，

Co.Ltd.ofChinaPowerEngineeringConsulting

Grou

p

CentralSouthernChinaElectricPowerDesin

g

，

InstituteCo.Ltd.ofChinaPowerEngineering

ConsultinGrou

gp

，

NorthChinaElectricPowerDesignInstituteCo.

Ltd.ofChinaPowerEnineerinConsultin

ggg

Grou

p

NortheastChinaElectricPowerDesignInstitute

，

Co.Ltd.ofChinaPowerEnineerinConsultin

ggg

Group

ChinaEnergyEngineeringGroupGuangdong

，

ElectricPowerDesinInstituteCo.Ltd.

g

PowerConstructionCorporationofChinaHebei

··

2，

ElectricPowerEnineerinCo.Ltd.

gg

PowerConstructionCororationofChinaShanhai

pg

，

ElectricPowerEngineeringCo.Ltd.

：

Chiefdraftinstaff

g

LIYonshuanXUEChunlinWENZuomin

ggg

JIAJiangboLIANGMingTANGJian

YUANZhileiZHANGXiniLIHuichao

q

JIANGYueZHANGHuSHIFan

g

ZHANGGuangyuWANGJingyiWANGYanjie

WANGJingqianXIABoWANGZhiqiang

YINPenXUYonLIXiaotinLIJian

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LIQifenCHENGKenaPANChunin

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ZHOUQianZHUJinglinQIANGuangzhong

HUQuanZHANGXiaoliLIUWenxun

DONGFeifeiWANGYininWANGJin

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LIUChenZHUYongpingWANGZijin

BAIXiaolu

：

Chiefdeviewinstaff

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LIYongweiYANGLinYUANJun

SUZhaohuiZHAOJiangtaoLIJin

LIBenlianWANGJunanZHANGGuolian

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YEHonshenWANGJinWUQinhua

ggg

LUJiayuMAZhijianJIANGWeihua

LILiLIAOYiZHAOQuanian

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LIZhiCHENLiZHANGDonhon

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LANGXujunJIANGHaishengLIULilin

LIUYan

··

3Contents

…………………（）

1Generalprovisions1

…………………（）

2Termsandsmbols2

y

（）

………………

2.1Terms2

……………（）

2.2Smbols6

y

（）

………………

3Routin9

g

……………（）

4Meteorologicalconditions13

（）

……………

5Conductorandearthwire18

…（）

5.1Selectionofconductorandearthwire18

（）

………………

5.2Anti-vibrationofconductorandearthwire25

……………（）

5.3Anti-gallopingofconductor27

（）

………………

6Insulationcoordination28

……（）

6.1Basicrequirements28

6.2InsulationcoordinationandelectricalclearanceofAC

……（）

transmissionline31

6.3InsulationcoordinationandelectricalclearanceofDC

……（）

transmissionline36

………………（）

7Lihtninrotectionandroundin39

ggpgg

（）

……

7.1Basicrequirements39

……………（）

7.2LightningprotectionofACtransmissionline39

（）

……………

7.3LihtninrotectionofDCtransmissionline42

ggp

…………（）

7.4Groundingoftransmissionline44

（）

………………

8Insulatorsandfittins46

g

…………（）

9Arrangementofconductorandearthwire49

··

1（）

…………

9.1Distancebetweenconductors49

……………（）

9.2Horizontaloffsetofconductorandearthwire51

（）

……

9.3Windloadonwireforwindswin53

g

…………（）

9.4Windloadoninsulatorstringforwind-deviation57

（）

………

9.5Transosition59

p

……（）

10Crossingandgroundclearance61

（）

…………………

10.1Basicreuirements61

q

10.2CrossingandgroundclearanceofACtransmission

………………（）

line63

10.3CrossinandroundclearanceofDCtransmission

gg

（）

………………

line75

…………（）

11Accessories85

AendixADescritionofticalmeteoroloical

pppypg

……（）

district86

AendixBCalculationofminimumannualcost

pp

……（）

method87

AendixCCalculationofmaximumvoltaeradient

ppgg

……（）

onconductorsurface88

AendixDCalculationoffieldstrenthofcorona

ppg

………（）

radiointerference90

（）

……

AendixECalculationofcoronaaudiblenoise93

pp

，

AppendixFCalculationofnominalfieldstrength

totalfieldstrenthandioncurrentdensit

gy

……………（）

aboveground95

（）

…

AendixGAmacitofconductor98

pppy

AppendixHGallopingcheckandanti-galloping

（）

…………………

measures100

AppendixJPollutionclassificationstandardforhigh

··

2（）

……

voltaeoverheadlines107

g

AendixKReferencevalueofmfordifferent

pp1

…………（）

insulatortypes111

（）

………………

ExlanationofWordininthisStandard113

pg

………………（）

ListofQuotedStandards114

··

31Generalrovisions

p

1.0.1Thiscodeisestablishedtoimplementthebasicconstruction

uidelinesandtechnicalandeconomicoliciesofthestateinthe

gp

，

electricaldesinofoverheadtransmissionlinesandensuresafe

g

，，，，

reliabletechnicallyadvancedsuitablecost-effectiveresource

savingandenvironmentallyfriendlydesigns.

1.0.2ThiscodeisalicablefortheelectricaldesinofAC

ppg

110kV1000kVoverheadtransmissionlinesandDC±500kV

±1100kVoverheadtransmissionlines.

，

1.0.3Intheelectricaldesinofoverheadtransmissionlines

g

，

maturenewtechnoloiesnewmaterialsandnewrocesses

gp

，

shallbeactivelyusedandtheuseofadvancedtechnologies

，

androductsthatareenersavinconsumtionreducin

pgygpg

andenvironmentallfriendlshallberomotedconsiderin

yypg

engineeringfeatures.

1.0.4Appropriatestrengtheningmeasuresshouldbeused

forimortantlinesandsecialsectionstoimrovethesafetof

pppy

lines.

，

1.0.5Besidesthiscodetheelectricaldesignforoverhead

transmissionlinesshallmeetotheralicablestandardsofthe

pp

state.

··

12Termsandsmbols

y

2.1Terms

2.1.1Overheadtransmissionline

Anelectricowerlinewithconductorssuortedabove

ppp

thegroundusinginsulatingelementsandtowers.

2.1.2Ultra-hih-voltaeoverheadtransmissionline

gg

OverheadtransmissionlinewithanominalvoltageofAC

，

1000kVorDC±800kVandaboveabbreviatedasUHVline.

2.1.3Compactoverheadtransmissionline

Overheadtransmissionlineforwhichroundinmembers

gg

betweenthree-haseconductorshavebeeneliminatedthrouh

pg

optimizationofconductorconfigurationinordertoimprovethe

，

inherenttransmissionowerreducethewidthofcorridorand

p

increasethetransmissioncapacityperunitofthecorridor.

2.1.4Telecommunicationline

，，

Atelecommunicationlinerailwasinallinecable

yg

（，）

broadcastingortelevisionsignalfeedingoruserlineor

/，

remotecontrolsinalinlineinaformofoverheadoenwire

ggp

，，

overheadorburiedcableoverheadorburiedopticalcable

etc.

2.1.5Larecrossin

gg

，，

Asectionofalinecrossinganavigableriverlakeorstrait

forwhichsecialconsiderationsmustbeiveninconductor

pg

，

selectionortowerdesignduetothelargespanorhightowerand

··

2anfailureofwhichmaseriouslaffectthenaviationorisver

yyygy

difficulttoreair.

p

//

2.1.6Lightmediumheavyicingarea

Areaswithadesinicethicknessof10mmorlowerare

g

；

lighticingareasareaswithadesignicethicknesshigherthan

10mmandlowerthanoreualto20mmaremediumicin

qg

；

areasareaswithadesinicethicknessof20mmandaboveare

g

heavyicingareas.

2.1.7Referencewindseed

p

Windspeedcorrespondingtoanaveragingperiodof

，，，

10minhavinareturneriodof30ears50earsor100ears

gpyyy

anddeterminedthrouhrobabilitstatisticsaccordintothe

gpyg

observationdataofmaximumwindspeedat10mheighton

（

localoenandflatroundtheaveraeminimumwaterlevel

pgg

inwindseasonsovertheearsshallbetakenforlonsan

yygp

）

crossing.

2.1.8Desinicethickness

g

3

/

Icethicknessconvertedintodensityof0.9gcmwitha

returneriodsecifiedinthedesin.

ppg

，

2.1.9Rarewindspeedrareicethickness

，

Severewindoriceeventswhichdidoccuraccordinto

g

historicalrecordsandsinificantlexceededthefreuenc

gyqy

curvesrecordedovertheyears.

2.1.10Section

Linesectionbetweentwotensiontowers.

2.1.11Everdatension

yy

Thewiretensionatthelowestointofsaattheannual

pg

averagetemperature.

··

3（）

2.1.12EuivalentsaltdeositdensitESDD

qpy

（），

AmountofsodiumchlorideNaClthatwhendissolved

，

indemineralizedwatergivesthesamevolumeconductivityas

thatofthenaturaldeositremovedfromaivensurfaceofthe

pg

，

insulatordividedbytheareaofthissurfaceESDDforshort.

（）

2.1.13Non-solubledeositdensitNSDD

py

Amountofnon-solubleresidueremovedfromaivensurfaceof

g

，

theinsulatordividedbytheareaofthissurfaceNSDDforshort.

2.1.14Residentialarea

，，

Denselypopulatedareassuchasindustrialareasharbors

，

wharfrailwastationsandtowns.

y

2.1.15Non-residentialarea

Areasotherthanresidentialareas.

2.1.16Difficulttransortarea

p

Non-residentialareasinaccessibleforvehiclesandagricultural

machiner.

y

2.1.17Electricalclearance

Thedistancebetweenanylivepartofalineandthegroundingpart.

2.1.18Clearancetoround

g

Thedistancebetweenasingleconductororthecenterofa

bundledconductorandtheroundundersecifiedconditions.

gp

2.1.19Shieldinanle

gg

Theanglebetweentheplumblinethroughtheearthwire

andthelinethrouhtheearthwireandasinleconductoror

gg

theoutermostsub-conductorofabundledconductoronthe

towerwithoutconsideringswing.

2.1.20Mininaffectedarea

g

Areasaffectedbyminingactivities.

··

42.1.21Galloinreion

pgg

Reionswherelinesareliabletoalloundertheaction

ggp

oficeandwindinwinterandspring.

2.1.22Nominalelectricfieldintensitaboveround

yg

Theelectricfieldintensityabovegroundgeneratedby

surfacecharesofconductorsoftheDCline.

g

2.1.23Totalelectricfieldintensitaboveround

yg

Thestrengthoftheelectricfieldabovegroundcomposed

oftheelectricfieldeneratedbcharesontheconductorand

gyg

theelectricfieldgeneratedbyspacechargesinDClines.

2.1.24Ioncurrentdensit

y

Thecurrentreceivedonunitareaasaresultofsace

p

chargesmovingundertheactionofDCelectricfield.

2.1.25Sacerbetweenhases

pp

Aninsulationspacersupportedbetweentwophasesof

conductorstocontrolthedistancebetweentheconductors.

2.1.26Verticalclearance

Theprojectiondistanceinverticaldirectionbetween

sinleconductororthecenterofbundledconductorandthe

g

buildingorotherfacilitiesbelowtheline.

2.1.27Horizontalclearance

Theroectiondistanceinhorizontaldirectionbetweena

pj

（

singleconductororthecenterofabundledconductororouter

）

edeofatowerortowerositionandthebuildinorother

gpg

facilitiesbesidetheline.

2.1.28Spaceclearance

Thesacedistancebetweenasinleconductororthecenterofa

pg

bundledconductorandthebuildingorotherfacilitiesbesidetheline.

··

52.2Smbols

y

：

2.2.1Actionsandeffectsofactions

—；

TTheloadbornebinsulatorandfittin

yg

—/

TmaxMaximumtensionofconductorearthwireatthelowest

；

ointofsa

pg

—/；

TDesintensilestrenthofconductorearthwire

pgg

—

TRTheratedmechanicalbreakingloadofinsulatorand

；

fittin

g

—；

v0Referencewindspeed

—；

WReferencewindressure

0p

—/

WxDesignvalueofconductorearthwirewindloadfor

；

swin

g

—

WDesinvalueofinsulatorstrinwindloadforswin.

Iggg

：

2.2.2Electrical

—

nNumberofinsulatorsreuiredforeachstrinwhen

qg

；

thealtitudeisnomorethan1000m

—

nNumberofinsulatorsrequiredforeachstringinhigh

H

；

attitudeareas

—，

ULinevoltagewhichisnominallinevoltageforAC

；

linesornominalvoltaeforDClines

g

—（）；

UMax.haseoletoroundoeratinvoltae

ph-eppgpgg

—；

IThelightningwithstandlevelatthemiddleofspan

—；

UPollutionwithstandvoltaeofasinleinsulator

wgg

—

λUnifiedspecificcreepagedistance.

：

2.2.3Calculationcoefficients

—/

BIncreasincoefficientforwindloadofconductor

1g

；

earthwirecoatedwithice

··

6—

BIncreasincoefficientforwindloadofinsulatorstrin

3gg

；

coatedwithice

—

KCorrectioncoefficientforaltitudeofdischarge

a

；

voltae

g

—/；

KcConductorearthwiredesignsafetycoefficient

—；

kSusensionstrincoefficient

ipg

—；

kVoltaecoefficient

ug

—；

kfSagcoefficient

—

KMechanicalstrenthsafetcoefficientofinsulatorand

Ⅰgy

；

fitting

—；

KEffectivecoefficientofinsulatorcreepagedistance

e

—；

mAltitudecorrectionfactor

—；

mCharacteristicindex

1

—；

αSanreductioncoefficient

Lp

—/；

Conductorearthwireustfactor

cg

β

—/；

scConductorearthwireshapecoefficient

μ

—；

Heihtvariationfactorofwindressure

zgp

μ

—/；

γcConductorearthwirewindloadreductionfactor

—/

εConductorearthwirewindloadulsationreduction

cp

；

factor

—；

gPeakvaluefactor

—/

IConductorearthwireturbulenceintensitataverae

zyg

；

heihtofz

g

—；

I10Nominalturbulenceintensityataheightof10m

—；

δSancorrelationinteratinfactor

Lpgg

—；

eNaturalconstant

—；

αGroundroughnessindex

—；

Insulatorstrinshaecoefficient

SIgp

μ

··

7—

nNumberofinsulatorstrinserendiculartowind

Igpp

；

direction

—

λIWindloadshieldingreductionfactorofinsulatorsin

winddirection.

：

2.2.4Geometricalarameters

p

—；

AICalculatedwindareaofsingleinsulatorstring

—；

DHorizontaldistancebetweenconductors

—

DEuivalenthorizontallinedistancebetweenconductorsin

xq

；

trianglearrangement

—；

DHorizontalprojectiondistancebetweenconductors

p

—；

DVerticalroectiondistancebetweenconductors

zpj

—

dOuterdiameterorcalculatedicinouterdiameterof

g

/；

conductorearthwire

—；

Maximumsaofconductor

fcg

—；

HAltitude

—；

LSpan

—；

LSusensionstrinlenth

kpgg

—；

LGeometriccreeaedistanceofsinlesusensioninsulator

01pggp

—；

LHorizontalspanoftowers

p

—；

SDistancebetweenconductorandearthwire

—/；

zAveraeheihtofconductorearthwire

gg

—/

θAnlebetweenwinddirectionandconductorearthwire

g

；

direction

—

LInterallenthofcorrelationfunctioninhorizontal

xgg

direction.

··

83Routin

g

3.0.1Therouteshallbeselectedbasedontechnicaland

economiccomarisonsofschemesivinacomrehensive

pggp

，，，

considerationtothelengthoflinelandformgeologyicing

，，，，

areatrafficconstructionoerationandlocallannin

ppg

，，，，

etc.toensuresafereliableenvironmentallfriendlcost

yy

effectiverouting.

3.0.2Therouteshouldbeselectedbusinnewtechnoloies

ygg

，，

suchassatelliteimageaerialphotographyall-digitalGeographic

，；

InformationSstemandinfraredmeasurementetc.inareaswith

y

，

comlicatedeoloicalconditionseoloicremotesensin

pggggg

technologycanbeusedwhennecessary.

3.0.3Therouteshouldbeselectedavoidinimortantfacilities

gp

suchasmilitaryinstallationsandlargeindustrialandmining

enterrisesandmeetintownlannin.Whenavoidanceis

pgpg

，，

imossiblerelevantareementsshallbereachedandaroriate

pgppp

measuresshallbetaken.

3.0.4Therouteshouldbeselectedavoidinnaturalreserves

g

，，

andscenicareasetc.Whenunavoidablecarryoutevaluation

andreortforarovalroerl.

pppppy

3.0.5Therouteshouldbeselectedavoidinunfavorable-

g

，，，

geologyzonesminingaffectedareasheavyicingareas

alloinreionsandotherareaswherethesafeoerationis

gpggp

，

influenced.Whentheavoidanceisimpossiblenecessary

··

9measuresshallbetaken.

3.0.6Therouteshallbeselectedconsiderintheinterference

g

betweenthelineandadjacentfacilitiessuchasmagnetic

，，，

observatoriesbroadcastinstationsairortstelecommunication

gp

/

linesandoilgaslines.

3.0.7Therouteshouldbeselectedclosetotheexistin

g

，，

nationalhihwasrovincialhihwascounthihwasor

gypgyygy

townshiproadstomakefulluseoftheexistingtrafficconditionand

facilitateconstructionandoeration.

p

3.0.8Theinletandoutletlinesoflargepowerplantsand

load-centersubstationsandadacenttwoormultilecircuit

jp

linesshallbelannedunitedl.Inareaswitharestricted

py

，

corridorspacethelinesshouldbelaidonthesametowers.

，，

3.0.9Inlihtmediumandheavicinareasthelenthof

gygg

，，

sectionsshouldbenomorethan10km5kmand3kmrespectively

andshouldbenomorethan5kmforsinleconductorlines.For

g

，

ice-freeareasthevaluescanbedeterminedwithreferencetoliht

g

，

icingarea.Forlongsectionsmeasuresshallbetakenagainst

，

cascadinfailure.Inareaswheretheoerationconditionissevere

gp

，

e.g.mountainousareaswithgreataltitudedifferenceorspan

，，

differenceorareascoveredwiththickicethelenthofsections

g

shallbereducedroerl.Indeendentsectionsshallbeusedfor

ppyp

transmissionlinescrossingamainrailwayorexpressway.

3.0.10Forroutinandositioninoflinesinmountainous

gpg

，

areasspansandaltitudedifferencesshallberestrictedto

avoidgreatlydifferedspansonbothsidesofatower.When

，

unavoidablenecessarmeasuresshallbetakentoimrove

yp

safety.

··

10，

3.0.11Fortransmissionlineswithlarecrossinsthe

gg

routinschemeshallbedeterminedbcomrehensivetechnicaland

gyp

economiccomparisonconsideringtheconditionsoflargecrossings.

3.0.12Thelocationoflarecrossinsshallmeettherulesof

gg

，，，

relevantdeartmentsoflannincivilaviationtroos

ppgp

，，

waterwamaritimewaterresourcesandenvironmental

y

，

protectionetc.ofthelocalregion.

3.0.13Thelocationoflarecrossinsshallbeselected

gg

ivincomrehensiveconsiderationtohdroloicaland

ggpyg

，，

eoloicalconditionsandunstableriverchannelseismicfault

gg

，

collapseandlandslidemountainfloodscourzonesthat

influencethesafeoerationofthelineshouldbeavoided.If

p

，

unavoidablereliablemeasuresshallbetaken.

3.0.14Larecrossintowersshallmeetthefollowin

ggg

：

requirements

1Theshouldbeositionedoutsideof5-earreturneriod

ypyp

，

floodinareaandtheinfluenceofbankerosionandtransitionshall

g

beconsideredbasedontheminimumearssecifiedinTable

yp

3.0.14-1.

Table3.0.14-1Minimumearsofbankerosionandtransition

y

（）

influencetobeconsideredforlarecrossintowersear

ggy

Minimumyearsofbankerosion

Voltageclass

andtransitioninfluence

AC110kV330kV30

，

AC500kV1000kVDC±500kV±1100kV50

，

2Fortowerserectedinthewaterthestabilitof

y

riverbedshallbeconsideredandthemainchannelshallbekept

，

awayandthehydrologicaldatashallallowfortower

··

11foundationerosiondethandfoundationheihtinaccordance

pg

withTable3.0.14-2.Thetowerfoundationshallallowforthe

，

influenceoffloatingmattersandrestrictedflowingwaterand

reventionmeasurescanbetakenwhennecessar.

py

Table3.0.14-2Reuirementonreturneriodofhdroloical

qpyg

（）

dataforlargecrossingtowersinwateryear

ConsiderationoftowerConsiderationof

Voltageclass

foundationerosionfoundationheiht

g

AC110kV330kV3030

，

AC500kV750kV

5050

DC±500kV±660kV

，

AC1000kVDC±800kV±1100kV100100

，

3Forimportantnavigableriverstheouteredgeof

crossingtowerfoundationshallbekeptawayfromtheslope

toeofdikeatasafeclearanceinaccordancewiththerelevant

rovisionsofwaterresourcesauthorities.

p

3.0.15Thecrossingmodeoflargecrossingshallbe

determinedbtechnicalandeconomiccomarisonbasedon

yp

，，，

landformeoloicalconstructionandoerationconditions

ggp

anddesinedasanindeendentsection.

gp

3.0.16Largecrossingsshouldbedesignedwithdouble

circuitormultilecircuitconsiderinthesstemlannin.

pgypg

，

3.0.17Forlarecrossinsalloininvestiationshallbe

gggpgg

conductedforthesiteandthesurroundingareas.Ifthereisa

，

possibilityofgallopingthecrossingschemeshallbeselected

reasonabltokeeawafromalloinreionsandreducethe

ypygpgg

anglebetweentherouteoflargecrossinglineandthewinter

predominantwinddirectionasmuchaspossible.

··

124Meteoroloicalconditions

g

4.0.1Thedesignmeteorologicalconditionsforoverhead

transmissionlinesshallbedeterminedbasedonthemathematical

statisticsresultofmeteorologicaldataoftheareaalongthelineand

theoeratinexerienceoftheexistinlinesintheadacenc.

pgpgjy

Whenthemeteorolooftheareaalonthelineisclosetothatof

gyg

，

thetypicalmeteorologicalareasinAppendixAofthisstandard

thevalueslistedforticalmeteoroloicalareasshallbeused.

ypg

4.0.2Thedesignmeteorologicalconditionsforoverhead

transmissionlinesshallbesecifiedaccordancewiththe

p

：

followinreturneriods

gp

1100yearsforAC1000kVandDC±800kVandabove

transmissionlinesandtheirlarecrossins.

gg

250yearsforAC500kV750kVandDC±500kV

±660kVtransmissionlinesandtheirlarecrossins.

gg

330earsforAC110kV330kVtransmissionlinesand

y

theirlargecrossings.

，

4Forlinesofdifferentvoltaeclassessharintower

gg

thereturnperiodshallbedeterminedaccordingtothehighest

voltaeclass.

g

4.0.3Thereferencewindseedshallbedeterminedwiththe

p

annualaveragemaximumwindspeedat10-minuteintervalof

thelocalmeteoroloicalstationasasamleandextremevalue

gp

TypeⅠdistributionasprobabilitymodel.Theheightfor

··

13：

windseedcalculationshallmeetthefollowinreuirements

pgq

110mfromtheroundforeneraltransmissionlines.

gg

210mfromtheaveragelowestwaterlevelinwindy

seasonoverearsforlarecrossins.

ygg

，

4.0.4Fortransmissionlinesinmountainousareasmethodsof

，

statisticanalsiscomarisonandobservationshouldbeusedto

yp

calculatethereferencewindseedinmountainousareasbusin

pyg

themeteorologicaldataofthemeteorologicalstationsinthe

adacencandconsiderintheracticaloeratinexerience.When

jygppgp

，

reliabledataareunavailableitshouldbedeterminedbyincreasing

thestatisticalvaluefortheadacentlainreionb10%.

jpgy

，，

4.0.5Forlarecrossinroectsifreliabledataareunavailable

ggpj

thereferencewindspeedshouldbedeterminedbyconvertingthe

statisticalwindseedfortheadacentonshoretransmissionlineto

pj

10mabovetheaveragelowestwaterlevelinwindyseasonoveryears

atthecrossinlus10%andlusanother10%toallowforthe

gpp

influenceofthewatersurface.Thereferencewindseedforlare

pg

crossingsshallbenolowerthanthatfortheconnectedonshore

transmissionline.

，

4.0.6Whensufficienticingobservationdataareavailable

extremevalueTeⅠdistributionrobabilitmodelshouldbeused

yppy

；

todeterminethedesinicethicknessofthelinewhenthereisless

g

，

ornoicingobservationdatathedesignicethicknesscanbe

determinedbcomrehensiveanalsisconsiderinsurroundin

ypygg

，，，

landformsurfacefeaturesaltitudedifferencerouteandicing

meteorologyandotherelementsofthelineandtheoperating

conditionoftheexistinlinesintheadacenconthebasisof

gjy

collectingicingdata.

··

144.0.7Thereferencewindseedforvariousoverhead

p

transmissionlinesshouldbenolowerthanthesecificationsin

p

，

Table4.0.7andtheloaddesignshouldbebasedonrarewind

seedconditionwhennecessar.

py

Table4.0.7Minimumreferencewindseedforvarious

p

（/）

overheadtransmissionlinesms

Linetype

Voltageclass

GenerallineLargecrossing

AC110kV330kV2225

，

AC500kV750kVDC±500kV±660kV2527

，

AC1000kVDC±800kVandabove2730

，

4.0.8Forlihticinareasthedesinshouldbebasedonan

ggg

，；，

icethicknessof0mm5mmor10mmformediumicingareas

thedesinshouldbebasedonanicethicknessof15mmor

g

；，

20mmforheavicinareasthedesinshouldbebasedonan

ygg

；，

icethicknessof20mmandabovewhennecessarytheload

designshouldbebasedonrareicethicknesscondition.

，

4.0.9Excetice-freesectionsthedesinicethicknessfor

pg

larecrossinlinesshouldbe5mmhiherthanthatofeneral

gggg

linesintheadjacency.

，

4.0.10Exceptice-freesectionsthedesignicethicknessof

earthwireshallbe5mmhiherthanthatofconductor.

g

4.0.11Theinvestiationofthedesinandoerationof

ggp

，

existinglinesintheareaalongthelineshallbeintensifiedand

theinfluencesofmicrotoorahicalandmicrometeoroloical

pgpg

，，

conditionsandalloinreionetc.shallbeconsideredin

gpgg

thedesign.

4.0.12Theannualaveragetemperaturefordesignshallmeet

··

15：

thefollowinreuirements

gq

1Whentheannualaveraetemeratureofthereionis

gpg

，

3℃17℃amultipleof5thatisclosetotheannualaverage

temeratureshouldbeused.

p

2Whentheannualaveragetemperatureoftheregionis

，

lowerthan3℃orhiherthan17℃amultileof5thatis

gp

closetotheannualaveraetemeratureminus3℃or5℃

gp

shouldbeused.

，

4.0.13Foreverdaloadconditionannualaveraetemerature

yygp

conditionshouldbeused.

，

4.0.14Forthedesinwindconditionamultileof5about

gp

theaveraetemeratureinthemonthwiththemaximumwind

gp

speedshouldbeused.

，

4.0.15Fordesinicinconditionatemeratureof-5℃

ggp

；/

shouldbeusedwindspeedof10msshouldbeusedforlight

，/

andmediumicinareasand15msshouldbeusedforheav

gy

；，

icinareaswhenmeasureddataareavailablethemeasured

g

windspeedcanalsobeused.

，

4.0.16Forunevenicinconditionatemeratureof-5℃

gp

/

andwindspeedof10msshouldbeused.

，

4.0.17Forlihtninovervoltaeconditionatemeratureof

gggp

；

15℃shouldbeusedwhenthewindseedattheaverae

pg

heightofconductorcalculatedbasedonreferencewindspeedis

/，/

reaterthanoreualto35msawindseedof15msshould

gqp

，，/

beusedforlightningovervoltageconditionotherwise10ms

；

shouldbeusedtheclearancebetweenconductorandearth

wireshouldbecheckedwithoutwindandice.

，

4.0.18Forswitchingovervoltageconditionannualaverage

··

16，

temerature50%ofthewindseedattheaveraeheihtof

ppgg

（

conductorcalculatedbasedonreferencewindseednoless

p

/）

than15msandzeroicethicknessshouldbeused.

，

4.0.19Forliveoerationconditionatemeratureof15℃

pp

/，

andwindseedof10mscanbeusedandzeroicethickness

p

shallbeused.

，，

4.0.20Foralloinconditionatemeratureof-5℃

gpgp

/

windseedof15msandicethicknessof5mmshouldbeused.

p

，

4.0.21Forraremeteorologicalconditionrecordedrare

windandrareicethicknessdatainthehistorycanbeused.

，

4.0.22Forrareicethicknessconditionatemeratureof

p

/

-5℃andwindseedof10msshouldbeused.

p

，

4.0.23Forrarewindconditionatemperatureofamultiple

of5thatisclosetothetemeraturewhentheconditionoccurs

p

minus3℃shouldbeusedwithoutice.

，

4.0.24Forwirebreakingconditionatemperatureof-5℃

；

desinicethicknessshouldbeusedwithoutwindforice-free

g

，

areasatemeratureof5℃shouldbeusedwithoutwindand

p

ice.

，

4.0.25Forstringbreakingconditionatemperatureof

；，

-5℃shouldbeusedwithoutwindandiceforice-freeareas

atemeratureof5℃shouldbeusedwithoutwindandice.

p

··

175Conductorandearthwire

5.1Selectionofconductorandearthwire

5.1.1Theconductorsectionandbundleteoftransmission

yp

linesshouldbeselectedbasedoneconomiccurrentdensit

y

，

accordingtotherequirementofthesystemanddeterminedby

，

comarisonofelectricalandmechanicalfeaturesetcbasedon

p

systemtransmissioncapacityconsideringthematerialand

structureofvariousconductorsandeconomiccomarison

p

usingminimumannualcostmethod.SeeAppendixBofthis

standardforthecalculationofminimumannualcostmethod.

，

5.1.2Forlarecrossintheallowableamacitconductors

ggpy

，

shallmeetthetransmissioncapacitylimitofthesystem

conductorsshallbedeterminedbcomrehensivetechnicaland

yp

，

economiccomparisonandmodelsortypesofwireswith

oeratinexerienceshouldbeused.

pgp

5.1.3Theconductorsectionandbundleteoftransmission

yp

linesshallmeettherequirementsofelectromagneticenvironment.

Themaximumotentialradientontheconductorcanbecalculated

pg

usingtheformulainAppendixC.Whenthesteelreinforced

aluminumstrandedconductorinRoundWireConcentricLa

y

/，

OverheadElectricalstrandedConductorsGBT1179isusedin

，

regionswithanaltitudenomorethan1000mtheminimumouter

diameterofconductorandnumberofsub-conductorsshallmeetthe

：

followingrequirements

··

18，

1ForAClinestheminimumouterdiameterofconductor

andnumberofsub-conductorsshallmeetthereuirementsin

q

Table5.1.3-1.

Table5.1.3-1Minimumouterdiameterof

conductorandnumberofsub-conductorsforAClines

Nominal

1102203305007501000

（）

voltaekV

g

Numberofsub-8×30.0

（）

conductors×outer2×2×4×6×singlecircuit

9.621.633.8

diameterof21.636.221.623.98×33.8

（）（）

conductormmdoublecircuit

，

2ForDClinestheminimumouterdiameterofconductor

andnumberofsub-conductorsshallmeetthereuirementsin

q

Table5.1.3-2.

Table5.1.3-2Minimumouterdiameterofconductor

andnumberofsub-conductorsforDCsinle-circuitlines

g

Nominal

±500±660±800±1100

（）

voltaekV

g

Numberofsub-

conductors×outer2×4×4×6×6×8×8×10×

diameterof44.523.836.230.033.827.644.538.4

（）

conductormm

5.1.4Theradiointerferencelimitoftransmissionlinesshall

，

meetthefollowinreuirementsandthecoronaradio

gq

interferencefieldintensitcanbecalculatedusintheformulas

yg

inAppendixD.

，，

1ForAClineswhenthealtitudeisnomorethan1000m

theradiointerferencelimitat20mawayfromthegroundprojection

··

19ofoutermosthaseconductorand2mheihtabovetheround

pgg

，

undertheconditionsof80%timewith80%confidenceand

0.5MHzshallmeettherequirementsofTable5.1.4.

Table5.1.4Radiointerferencelimits

（）

NominalvoltaekV1102203305007501000

g

［（/）］

LimitdBVm4653555858

μ

，

2ForDClineswhenthealtitudeisnomorethan

，

1000mtheradiointerferenceat20mawafromtheround

yg

roectionofositiveolaritconductorand2mheihtabove

pjppyg

，

thegroundundertheconditionsof80%timewith80%

（/）

confidenceand0.5MHzshallnotexceed58dBVm.

μ

5.1.5Theaudiblenoiselimitoftransmissionlinesshallmeet

，

thefollowinreuirementsandthecoronaaudiblenoisecan

gq

becalculatedusingtheformulasinAppendixE.

，

1ForAClinesat20mawayfromthegroundprojection

，

ofoutermosthaseconductortheaudiblenoiseshallnot

p

（）

exceed55dBAinraindas.

yy

，

2ForDClinesat20mfromtheroundroectionof

gpj

，（）

positivepolarityconductorthecoronaaudiblenoiseL50

（）；

shallnotexceed45dBAinfinedaswhenthelineasses

yp

，

sarseloulatedareaswithanaltitudemorethan1000m

pypp

（）

thecoronaaudiblenoiseshallnotexceed50dBA.

，

5.1.6ForDClinesthelimitoftotalelectricfieldintensity

abovegroundandioncurrentdensityinfinedaysshallmeet

thereuirementsinTable5.1.6.Thenominalelectricfield

q

，

intensitaboveroundtotalelectricfieldintensitabove

ygy

groundandioncurrentdensityofDClinescanbecalculated

usingtheformulasinAppendixF.

··

20Table5.1.6Limitsoftotalelectricfield

intensityabovegroundandioncurrentdensity

TotalelectricfieldIroncurrentdensity

Area

2

（/）

（/）

intensitykVmnAm

Residentialarea2580

Generalnon-residential

30100

area

5.1.7Theelectromaneticenvironmentshallbeverifiedfor

g

theselectionoftensiontowerjumperandinletandoutletspan

conductorof750kVand1000kVAClines.

5.1.8Theallowableamacitofconductorcanbecalculatedusin

pyg

；

themethodinAendixGtheallowabletemeratureofconductor

ppp

：

inthecalculationshouldmeetthefollowinreuirements

gq

（）

1+70℃or+80℃whennecessaryforsteeloraluminum

，

cladsteelreinforcedaluminumstrandedconductorsteelor

，

aluminumcladsteelreinforcedaluminumalloystrandedconductor

aluminumalloreinforcedaluminumstrandedconductorand

y

；

aluminumalloystrandedconductor+90℃forlargecrossings.

2+80℃foraluminumcladsteelstrandedconductor

；

andsteelreinforcedaluminumcladsteelstrandedconductor

；

+100℃forlarecrossinsortobedeterminedbtest.

ggy

3+125℃forgalvanizedsteelstrandedconductor.

：

Notetheambientairtemeratureshouldbetheaverae

pg

；

hihesttemeratureinthehottestmonththewindseed

gpp

/（/）；

shallbe0.5msor0.6msforlarecrossinsthesolar

gg

2

/

radiationowerdensitshallbe0.1Wcm.

py

，

5.1.9ForACcomactlinestheconductorshallbeselected

p

：

inaccordancewiththefollowingrequirements

··

211Thecharesoneachsub-conductorshallbebasicall

gy

balanced.

2Toincreasethenaturaltransmissionpowerofthe

，

linemultiplebundledconductorsshallbeusedforcompact

，

lineswithsub-conductorsarranedsmmetricalland

gyy

；

uniformlthenumberofsub-conductorsofeachhaseshall

yp

meettherequirementsinTable5.1.9.

Table5.1.9Minimumsub-conductorsofeachhaseforcomactlines

pp

（）

NominalvoltagekV220330500

Numberofsub-conductors446

5.1.10Earthwireshallmeetelectricalandmechanicalservice

，

conditionsandcanbemadeofalvanizedsteelstrandedconductor

g

orcomositestrandedconductor.Inthecheckincalculationof

pg

，

shortcircuitthermalstabilitythecalculationperiodandthe

correspondingshortcircuitcurrentshallbedeterminedaccordingto

；

thesstemconditionstheallowabletemeratureofearthwire

yp

：

shouldmeetthefollowinreuirements

gq

1200℃forsteelreinforcedaluminumstrandedconductor

andsteelreinforcedaluminumalloystrandedconductor.

2300℃forsteelreinforcedaluminumcladsteelstranded

conductorandaluminumcladsteelstrandedconductor.

3400℃foralvanizedsteelstrandedconductor.

g

，

4Foropticalfibercompositeoverheadearthwiretheallowable

temperatureshallbetheguaranteedvalueofproducttest.

5.1.11Theearthwireshallbeverifiedunderthecorona

，

incetioncondition.ForAClinestheearthwiresurfacemaximum

p

electricfieldintensitytocoronainceptionelectricfieldintensity

；，

ratioshouldnotexceed0.8forDClinestheearthwiresurface

··

22/

maximumfieldintensitshouldnotexceed18kVcm.

y

5.1.12Thestructureselectionofopticalfibercomposite

overheadearthwireshallconsiderlihtninresistance.

gg

，

5.1.13Forlargecrossingstheearthwireshallbedetermined

，

bcomrehensivetechnicalandeconomiccomarisonsaluminum

ypp

cladsteelstrandedconductorisrecommended.

5.1.14Whenalvanizedsteelstrandedconductorisusedfor

g

，

earthwiretheminimumsectionshouldmeetthereuirements

q

ofTable5.1.14.

Table5.1.14Reuirementsonminimumsectionwhenalvanized

qg

steelstrandedconductorisusedforearthwire

ACDC

Voltaeclass

g

500kV±500kV±800kV

110kV220kV330kV1000kV

750kV±660kVandabove

Mi