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海阳核电—崂山500kV输电线路工程接地施工方案吉林省送变电工程公司海阳核电—崂山500kV输电线路工程施工项目部2013年7月15日海阳核电—崂山500kV输电线路工程接地施工方案批准人:年月日审核人:年月日编制人:年月日海阳核电—崂山500kV输电线路工程接地施工方案目录一、编制依据...........................................................................................................................1二、工程概况...........................................................................................................................1三、施工准备...........................................................................................................................11.施工工器具准备...............................................................................................................12.接地材料准备...................................................................................................................1四、接地施工...........................................................................................................................21、接地沟开挖.........................................................................................................................22、接地体连接...................................................................................................................33.接地体安装.......................................................................................................................44.接地电阻测量...................................................................................................................4海阳核电—崂山500kV输电线路工程接地施工方案1一、编制依据1、海阳核电—崂山500kV线路工程-接地施工图(100-SA07511S-D0201)2、《110kV~500kV架空电力线路施工及验收规范》(GB50233—2005)3、《钢筋焊接及验收规范》(JGJ18—2003)4、《电力建设安全工作规程》(架空电力线路部分)(DL5009.2-2004)5、《交流电气装置的接地》DL/T621-1997二、工程概况海阳核电—崂山500kV输电线路工程,地形主要以平地及丘陵为主,有少部分山地;塔基接地数量109基,接地型式有:JD1、JD2、TF5、TF5A、TF10、TF10A、TF20、TF20A,共计8种接地型。三、施工准备1.施工工器具准备电焊机、开挖工具(铁锹、钢钎)2.接地材料准备接地引下线以及接地体均采用热镀锌Φ12圆钢,部分基础接地采用降阻剂,具体长度用量见附件1:接地施工统计表每基另有:70×4×120联板4块;M16×37螺栓、防卸碗及垫圈8个;10米接地引下线(镀锌Φ12圆钢×2.5m×4)海阳核电—崂山500kV输电线路工程接地施工方案2四、接地施工1、接地沟开挖(1)接地装置距基础边沿按1米考虑,可适当调整;塔位明细表中接地装置为预测装置,施工时S随塔基尺寸不同而定,S变化时调整L,使其总长度不变。(2)接地沟开挖的槽位,应避开道路、地下管道及电缆等,如海阳核电—崂山500kV输电线路工程接地施工方案3遇有地下光缆、输油管道等障碍物,接地装置射线需朝远离障碍物的方向敷设。(3)平地、丘陵地区不小于0.8m;地表为土质的山区不小于0.6m;地表为岩石的山区不小于0.3m;接地沟宽度0.4米。(4)施工图中土方按0.8m深度、0.5m宽度计算。2、接地体连接(1)接地圆钢的连接采用搭接方式,焊缝长度100mm,双面焊缝;引上线及联板加工焊好后镀锌。(2)连接前应清除连接部位的铁锈;接地体间连接必须可靠。(3)除设计规定的断开点可用螺栓连接外,其余应用焊接连接;中等腐蚀地段及强腐蚀地段,接地装置的接地体需涂刷防腐导电涂料。对接地装置的焊接点处采取涂刷防腐导电涂料的防腐措施,涂刷三遍导电防腐涂料,接地体表面不得有水份,泥沙,铁锈等,并清除焊点焊渣,以保证涂料的粘附强度,施工工艺由防腐涂料厂提供。每基塔按配置的接地型号将接地体按说明全部埋人,不得减少,接地装置敷设完毕后,应实测每基铁塔的工频接地电阻值,工频接地电阻值应满足施工图纸的要求,当所测得的接地电阻未满足要求时,应在已敷设的接地装置上加埋接地圆钢直至满足设计要求,当加长后接地体总长度达到后一型接地装置的长度时,则按后一型接地装置所要求的电阻值验收。海阳核电—崂山500kV输电线路工程接地施工方案43.接地体安装(1)用于插入式角钢时,引上线应平行主材,避开斜材连板并保持顺直。(2)初始安装时,接地联板的两个孔均通过螺栓与塔腿相连。(3)铁塔接地装置与邻近设施接地体接近时,为防止反击,两接地体的最近距离不宜小于5m。(4)接地体间连接必须可靠。(5)接地体间连接必须可靠。(6)接地装置应按设计图敷设,受地质地形条件限制时方框尺寸可根据铁塔根开适当增减,但接地圆钢的总长度不变,接地体边框与基础立柱的最小距离应大于0.5米。但不论修改与否均应在施工记录上绘制接地装置敷设简图并标示相对位置和尺寸。(7)降阻剂施工:在沟底垫10cm左右回填土整平,浇水将坑底土壤湿润,将热镀锌圆钢拉直置于沟中,降阻剂加50%的水搅拌成稠糊状,均匀地包裹在接地体周围,覆盖严实,接地体的等效直径为16cm,静止30分钟,待表面凝固后,回填土并夯实。降阻剂应选用长效防腐物理性降阻剂。(8)接地电阻测量(1)测量接地电阻可采用接地摇表。所测得的接地电阻值不应大于设计规定值。(2)实测每基接地装置的接地电阻,测量时与地线绝缘。(3)如果测量电阻值达不到要求,应延长射线直至工频电阻R海阳核电—崂山500kV输电线路工程接地施工方案5值满足要求时为止,但每根射线长度不超过60m。(4)设计允许最大电阻值见图纸或附件1:接地施工统计表海阳核电—崂山500kV输电线路工程接地施工方案6附件1:接地施工统计表杆塔号接地型号S方环边长L射线长射线根数总长度总重量接地极数量土方量允许电阻118TF10A20214164145.61065.620119JD218304192170.52456.430120JD218304192170.52456.430121JD218304192170.52456.430122JD218304192170.52456.430123JD218304192170.52456.430124JD218304192170.52456.430125JD218304192170.52456.430126JD218304192170.52456.430127TF51513411299.52044.815128JD218304192170.52456.430129TF5A208411299.52044.815130TF51513411299.52044.815131TF5A208411299.52044.815132TF51513411299.52044.815133TF51513411299.52044.815134JD218304192170.52456.430135JD218304192170.52456.430136JD218304192170.52456.430137JD218304192170.52456.430138JD218304192170.52456.430139JD218304192170.52456.430140JD218304192170.52456.430141JD218304192170.52456.430142JD218304192170.52456.430143JD218304192170.52456.430144JD218304192170.52456.430145JD218304192170.52456.430146TF51513411299.52044.815147TF51513411299.52044.815148TF51513411299.52044.815149TF51513411299.52044.815150TF10A20214164145.61065.620151JD218304192170.52456.430152TF51513411299.52044.815153JD218304192170.52456.430154TF51513411299.52044.815155JD118254172152.742049.3625156JD118254172152.742049.3625157JD118254172152.742049.3625海阳核电—崂山500kV输电线路工程接地施工方案7杆塔号接地型号S方环边长L射线长射线根数总长度总重量接地极数量土方量允许电阻158TF10A20214164145.61065.620159TF5A208411299.52044.815160JD118254172152.742049.3625161JD218304192170.52456.430162JD218304192170.52456.430163JD218304192170.52456.430164JD218304192170.52456.430165JD218304192170.52456.430166JD218304192170.52456.430167JD218304192170.52456.430168TF2015504260231010425169TF5A208411299.52044.815170TF51513411299.52044.815171TF10A20214164145.61065.620172TF51513411299.52044.815173TF10A20214164145.61065.620174TF51513411299.52044.815175JD218304192170.52456.430176JD218304192170.52456.430177JD218304192170.52456.430178TF2015504260231010425179JD218304192170.52456.430180JD218304192170.52456.430181JD218304192170.52456.430182JD218304192170.5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