【摘要】 国家电网公司和南方电网公司均把直流融冰作为输电线路除冰的重点发展技术。为此,应用传热学的基本原理分析了输电线路直流融冰的热平衡过程,提出了临界融冰电流和融冰时间的计算模型,模型的计算结果得到了试验验证。分析的结果表明,临界融冰电流和融冰时间受环境温度和风速的影响明显,环境温度越低,或者风速越大,均会造成临界融冰电流变大,或者使融冰时间变长。更多还原

【Abstract】 State Grid Corporation and Southern Power Grid Company have taken the DC ice-melting as the main method to resist the ice accident on transmission lines.The heat balance of DC ice-melting on transmission lines with heat transfer theory was analyzed,and a calculation model for critical ice-melting current and ice-melting time was proposed in the paper.The analytic results with experiments show that critical ice-melting current and ice-melting time are affected by ambient temperature and wind velocity.The critical ice-melting current gets greater and the ice-melting time gets longer when the ambient temperature is lower or the wind velocity is greater.更多还原