750kV三相一体变压器放电原因分析

Cause Analysis of Discharge of 750 kV Three-Phase Integrated Transformer

变压器的状态是否正常关系到电力系统的安全可靠稳定运行。文章以一起750 kV三相一体变压器局部放电试验过程中发生的放电事故为例,分析了局部放电试验前后不同部位油中溶解气体的分布情况,以及发生放电后油中溶解气体的扩散过程,初步判断了故障部位,并通过内部检查得到了验证。

Whether the state of transformer is normal or not is related to the safe,reliable and stable operation of power system.In view of a discharge accident in the process of partial discharge test of 750 kV Three-Phase integrated transformer,the distribution of dissolved gas in oil before and after PD test and the diffusion process of dissolved gas in oil after PD test were analyzed.The fault location was preliminarily determined and verified by internal inspection.