中文摘要：

为了研究并联间隙装置对绝缘子串电压分布特性的影响，用有限元法建立了220kV输电线路复合绝缘子三维电场计算模型来研究加装不同并联间隙装置后的绝缘子电压分布，并和加装均压环后电压分布进行对比。计算结果表明：环形并联间隙对绝缘子的均压效果明显优于棒形并联间隙，环形间隙环径越小，管径越大，其改善复合绝缘子端部的电场及电压分布作用越明显，而罩人深度太大则不利于绝缘子端部电压分布的改善，不能有效屏蔽复合绝缘子根部。此外，通过和加装均压环后绝缘子电压分布的对比发现，利用环形并联间隙取代均压环是可行的。

英文摘要：

In order to analyze the impact of parallel gap lightning protection device（PGLPD） on the voltage distribu- tion along insulators,taking 220 kV composite insulators as example, we established a three-dimensional electric field calculation model of composite insulators of the transmission line by the finite element method. The impact of different types of PGLPD on the voltage distribution along insulators is analyzed. The voltage distribution along in- sulators when PGLPD and shielding rings is employed separately is compared. Results show that the performance of the ring type PGLPD is superior to that of stick type PGLPD. For the ring type PGLPD, when its cube diameter is longer and ring diameter is shorter, the voltage equalizing characteristic is better. And better voltage equalizing characteristic can be obtained when the insertion depth of PGLPD is suitable. Moreover, simulations demonstrate that it is feasible to use ring type PGLPD as an alternative of shielding rings.