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国网35kV输电线路典型设计培训课件(经典)

  • 2026-09-08 18:23:59
国网35kV输电线路典型设计培训课件(经典)
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统一性:典型设计的基本方案统一,建设标准统一,基建和生产标准统一,外部形象体现国家电网公司企业文化特征

可靠性:各个模块安全可靠,通过模块拼接得到的技术方案安全可靠;

适应性:典型设计要综合考虑不同地区的实际情况,要在公司系统中具有广泛的适用性,并能在一定时间内,对不同规模、不同形式、不同外部条件均能适用;

先进性:推广应用电网建设新技术,鼓励设计创新;典型设计各项技术经济可比指标先进;

经济性:综合考虑工程初期投资与长期运行费用,追求工程寿命期内最佳的企业经济效益;

灵活性:典型设计模块划分合理,接口灵活,组合方案多样,增减方便,便于调整概算,方便使用。

5.1 设计气象条件

根据各网省公司提供的典型气象条件,结合典型气象区的气象参数,对典型设计的设计风速和设计覆冰组合归并选择35kV输电线路的设计气象条件为:设计风速取25m/s、30m/s和35m/s;设计冰厚在25m/s和30m/s风区取5mm和10mm,在35m/s风区取0mm,共分为5种典型气象,分别是:

气象条件组合A:

最大风速25m/s、最低温度-20°C和最大覆冰5mm和10mm,主要适用于华中、华北和西北低海拔地区;

>气象条件组合E:

最大风速30m/s、最低温度-30°C和最大覆冰10mm,主要适用于西北高海拔地区;

>气象条件组合F:

最大风速30m/s、最低温度-20°C和最大覆冰5mm和10mm,主要适用于华中、华北部分山区和一般沿海地区;

>气象条件组合G:

最大风速35m/s、最低温度-10°C和最大覆冰Omm,主要适用于台风出现频率较高的东南沿海地区。

A气象区和F气象区应考虑适用于5mm和10mm两种覆冰条件。对于设计冰厚20mm以上的重冰区和设计风速40m/s以上的特殊风区,本次典型设计暂不考虑。

>绘制各类间隙圆图原则如下:

1)绘制间隙圆图时,绝缘子串长度按最长和最短计算,选用重量较轻的合成绝缘子计算各工况下的摇摆角,并按下导线和合成绝缘子导线侧的均压环分别检查塔头的电气间隙。

2)悬垂串的风偏计算时,风压不均匀系数a取值见表。

3)在计算导线风偏角时,考虑风压高度变化系数,直线塔计算高度为最大呼高减3m,耐张塔按最大呼高考虑。

4)间隙裕度:

角钢塔:带电部分对横担的间隙取100mm,带电部分对塔身的间隙取200mm,带电作业时不考虑该裕度。钢管杆、混凝土杆:带电部分对横担及杆身的间隙取100mm,带电作业时不考虑该裕度。

5)直线塔对塔身、横担上平面均按带电作业距离验算。

6)钢管杆及混凝土杆对身部、横担上平面均按带电作业距离验算。

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