基于X射线激励下的局部放电定位

Ｘ射线照射绝缘介质，可以激发或加强介质中的气隙放电；调节Ｘ射线照射的方位并检测因射线激励所产生的局部放电信号，可有效地确定局部放电的部位。本文通过研究Ｘ射线激励对变压器模型中气隙放电的影响，探讨Ｘ射线激励下的局部放电定位，为Ｘ射线激励下局部放电测量和定位技术在油纸绝缘系统中的应用奠定基础。

Location of partial Discharge by X-ray Irradiation

There are some defects existing in the power transformers such as manufacture craft and insulationdeterioration. To this end, partial discharge tests are often performed as a final check on quality. With conventional PD measurement technique, PD detection sensitivity is often limited by the availability of electrons necessary to initiate PD in defects. Statistical time lag, i. e., the time required for a discharge initiating free electronto appear in the defect, could make a dangerous defect undetectable. The application of X-rays during electricalPD measurements can increase the free electron production rate in the cavity and decrease the statistical time lag,resulting in an improved PD sensitivity. Partial discharge is induced or intensified when dielectric is irradiatedby X-ray, the location of partial discharge can been fixed on by modulating orientation of X-ray irradiation anddetecting partial discharge signal because of X-ray irradiation.