紫外脉冲法在特高压放电检测中的应用

Application of UV Pulse Method on the UHV Discharge Detection

目前的超高压系统一般通过红外成像仪、紫外成像仪等检测放电,但都未实现定量检测,而特高压系统的绝缘要求更高、设备对地距离更大,尤其特高压输电线路对检测距离的要求很高。为此,提出了基于紫外脉冲法的特高压输电系统放电非接触式检测方法,该法能实现对特高压输电系统放电程度的远距离精确对位的定量检测,可准确判定特高压电气设备的外绝缘状况;还研制了相应的检测器并在西北电网公司750kV官亭变电站进行了放电实测,验证了该方法的检测能力,其最大测量距离>32m。

Nowadays, the methods of UHV system discharge detection are often by infrared imaging system, UV-C imaging system, etc. But none of them can measure the discharge degree of electric equipment quantitatively. As to the high dielectric level of the UHV system, the long distance from ground exists; especially in detecting the discharge of the electrical equipments on the UHV line tower, the detector must have a long enough detection distance. The highest voltage level of national detector is 500kV. This paper brings a new non-contact discharge detection method for UHV transmission system based on the UV pulse method. It can quantitatively measure the discharge of UHV electric equipments, and there is a long effective detection distance and an accurate aiming point. It can be used to evaluate the dielectric level of the UHV system. The detector corresponding to the method is also developed, and the detection ability is proved to be strong by the discharge detection test in the 750 kV Guanting transformer substation of Northwest Grid. In the test, the max effective detection distance has reached more than 32 m. The non-contact discharge detection method, which is based on the UV pulse, is applicable for the apparatus of UHV transmission system. It can quantitatively measure the discharge, then give the conditon of dielectric level. The UV pulse mentioned in the paper can provide the data evidence for the degree of discharge and insulation state by the pulse number in certain time which was measured from the UHV electric equipments.