The axial electric stress necessary to cause external flashover of the interrupter porcelain of various designs of circuit breaker has been determined as a function of the severity of an artificial salt fog; related investigations have been conducted at a marine testing station. The much inferior performance of the horizontal head to that of the vertical one is explained by using a simple mathematical model to analyse the influence of saline drainage from the porcelain. The findings are discussed from the viewpoint of trying to realise the full potential of the outdoor SF/sub 6/ circuit breaker on a 400 kV power system, in particular, for the synchronising function. The need for further research to enhance the pollution flashover strength of a horizontal barrel insulator is clearly shown. The experimental results are analysed with regard to the validity of IEC document 815.
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机译:已经确定了导致各种设计的断路器的灭弧室瓷器外部闪络所需的轴向电应力,该应力取决于人工盐雾的严重程度;相关调查已在海洋测试站进行。通过使用简单的数学模型来分析盐分从瓷器中排出的影响,可以解释水平头与垂直头相比的劣等性能。从试图实现室外SF / sub 6 /断路器在400 kV电力系统上的全部潜力,尤其是实现同步功能的观点出发,讨论了这些发现。明确显示了需要进行进一步研究以提高水平桶形绝缘子的污染闪络强度的需求。针对IEC 815的有效性分析了实验结果。
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