特高压直流瓷绝缘子铁帽加速电腐蚀试验

发布时间：2018-07-25 14:08

【摘要】：目前,多条-800 kV直流输电线路出现大面积V串瓷绝缘子铁帽电腐蚀现象,给输电线路安全运行造成重大隐患。搭建了V串瓷绝缘子铁帽加速电腐蚀试验平台,提出了一种采用滴水法模拟现场瓷绝缘子铁帽电腐蚀情况的试验方法,并采用该方法对特高压线路瓷绝缘子铁帽进行了加速电腐蚀试验。试验结果表明,采用该方法获得的铁帽电腐蚀区域的参数与现场电腐蚀情况差别在10%之内,具有良好的等效性;在长期的液体环境下,运行线路负极性侧瓷绝缘子铁帽发生严重的电腐蚀,当损失电荷量为80 000 C时,铁帽电腐蚀深度达12.2 mm;绝缘子铁帽加装保护锌环可以改变铁帽电腐蚀的起始点和方向,并且锌环首先发生电腐蚀,因此,锌环对铁帽电腐蚀问题具有明显的抑制作用。
[Abstract]:At present, a large area of V-string porcelain insulator iron cap is corroded in many -800 kV HVDC transmission lines, which causes great hidden trouble to the safe operation of transmission lines. An accelerated electric corrosion test platform for V series porcelain insulators was set up, and a test method was put forward to simulate the electric corrosion of ceramic insulators in the field by drip method. The accelerated electric corrosion test of porcelain insulator cap for UHV transmission line was carried out by using this method. The experimental results show that the parameters of the electric corrosion zone of the iron cap obtained by this method are within 10% of the in-situ electric corrosion conditions, and have good equivalence in the long term liquid environment. The negative side porcelain insulator cap of the running line has serious electric corrosion. When the loss of charge is 80 000 C, the electric corrosion depth of the cap reaches 12.2 mm. The starting point and direction of the cap electric corrosion can be changed by adding protective zinc ring to the insulator iron cap. The zinc ring is the first to take place the electric corrosion, therefore, the zinc ring has the obvious inhibition to the iron cap electric corrosion problem.
【作者单位】：南方电网科学研究院有限责任公司;清华大学深圳研究生院;
【基金】：特高压工程技术(昆明、广州)国家工程实验室开放基金资助(NEL201203/NEL201301)~~
【分类号】：TM216

【参考文献】