关于送电线路架空地线热稳定校核的探讨

Discussion on Checking Thermal Stabilization of Over-head Grounding Wire of Transmission Line

架空送电线路设计中,地线除满足电气和机械使用条件外,还应考虑通信干扰等因素,选用镀锌钢绞线时一般按《110-500kV架空送电线路设计技术规程》(DLT5092-1999)表3中有关数据选定,由于计算公式中的参数较多,因此多数设计人员根椐以往设计经验进行导地线配合。广东电网地区供用电极不平衡,局部网络短时过负荷的现象时有发生,某些重要送电线路导地线热稳定验算尤为重要。

Except to meet electric and mechanical operation aonditions, the factors, such as communication disturbing etc, should be also considered in the design of over-head transmission line. Although the table 3 in ＂110-500kV Over-head Transmission Line Design Technology Regulations＂ （DLT5092-1999） is used commonly for selecting the galvanize steel twist wire, as there is so much factors in the calculation formula, the designer does the grounding wire cooperation only according to the design experience refore. Gonsidering the unbalance of power supply and short time over-load in part of Guangdong network are happened often, so checking thermal stabilization of over head grounding wire in some important power transmission line would be needed especially.