关于导线和电力电缆截面的选择计算.pdf

2010Vol42No3∃99∃

黄恩才

(黑龙江运建建筑开发(集团)股份有限公司)

[]为了保证电线路安全可靠优经济地运行,在选择导线和电力电缆截面时必须满足正常运行时的最高允许温

度;同时还要保证正常运行时允许的电压损耗经济电流密度及机械强度

[]导线;电力电缆;电压;电流;导线的截面

SelectionComputationOfConductorAndPowerCableSection

HuangEncai

(YunjianArchitectureDevelopmentroupCo.,Ltd.OfHeilongjiangProvince)

Abstract:Theconductorandpowercablesectionshouldsatisfythemaxmiumpermittemperaturewhennormaloper

ationtoensurethesafety,credibility,highqualityandeconomyofelectriccircuitryoperation.Italsoneedstoen

surethevoltageconsumption,electriccurrentdensityandmechanismintensity.

Keywords:conductor;powercable;voltage;electriccurrent;conductorsection

1,:

,K=(t-t!)/(t-t)∀b

yx0yx0

:t#

yx

11发热条件t#

0

(t!#

0

),

,

12电压损耗条件,,

50%

,S05S

0

13经济电流密度

,,,

,

,S=S

0

14机械强度3

,