采用并联间隙作为架空输电线路的防雷保护措施是对现有防雷措施的有效补充，有着广阔的应用前景。介绍了东莞供电局110 kV线路复合绝缘子防雷保护并联间隙的应用研究成果。设计了多种并联间隙防雷保护装置，通过试验研究，验证其接闪雷电、疏导工频续流、均匀工频电场、保护绝缘子及金具的效果。经过逐步优化设计，确定并联间隙的电气参数和外形尺寸，研制出样品，并分别应用于5条110 kV线路上。介绍了所研制的110 kV线路复合绝缘子防雷保护并联间隙的现场运行情况。

The parallel gap lightning protection device is beneficial to the existing lightning protection measures for overhead transmission line and has broad application prospects.The application investigation on parallel gap lightning protection device of composite insulators for the 110 kV overhead transmission line used in Dongguan Power Supply Bureau is presented in this article.A variety of parallel gap lightning protection devices are designed.The functions of its guiding lightning discharge,transferring frequency arc,homogenizing frequency electric field and protecting insulators and fittings are verified by tests.After optimization of the design to determine the electrical parameters and dimensions of the gap,the samples are developed and used in five 110 kV transmission lines.The operation situation of the parallel gap lightning protection of composite insulator for 110 kV line is introduced.