Gaoya dianqi盆式绝缘子是GIS的关键绝缘器件，与两侧气室法兰通过螺栓进行紧固连接，当螺栓松动时会导致盆式绝缘子应力分布不均，从而影响GIS运行的安全性和稳定性。文中提出了一种基于超声临界折射纵波（LCR）的盆式绝缘子法兰螺栓松动检测方法，根据LCR波在盆式绝缘子法兰表面的传播声时差来反映螺栓松动情况。结果表明，当相邻螺栓松动时，LCR波在松动螺栓之间的法兰表面声时差变化最大，且变化量大于24 ns；当不相邻螺栓松动时，LCR波在松动螺栓正对的法兰表面声时差变化最大，且声时差变化量大于10 ns，并且螺栓松动程度越大，
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