Garton效应及其对容性设备高压介损测量的影响

Garton Effect and Its Influence on High-Voltage Dielectric Loss Measurement for Capacitive Equipment

高压介损(tanδ)测量是判断设备绝缘状况的有效方法。介绍了影响介损测量的Garton效应及其形成机理;在此基础上,结合测量实例,对试验中的Garton效应判定及处理方法提出建议。指出高压介损试验时,应采用均匀分段加压方式,使得tanδ—U曲线较为平滑。升压后进行降压试验,通过完整的tanδ—U曲线变化规律综合判断设备绝缘缺陷类型,有助于保障设备运行的安全性和经济性。

The high-voltage dielectric loss（tanδ） measurement is an effective method for the evaluation of insulation condition of equipment.Introduction was made to Garton effect’s influence on the dielectric loss measurement and its formation mechanism.On this basis,combined with the measuring examples,this paper proposed the judgment of Garton effect and treatment methods.It is pointed out that during the high-voltage dielectric loss test,the voltage should be applied evenly,so that the tanδ-U curve will be smooth.After the step-up test,a step-down test should also be conducted.The defect type of equipment insulation can be evaluated through the analysis of the change rule of tanδ-U curve,which helps to ensure the security and economical efficiency of equipment operation.