330kV变压器局部放电试验加压方式研究

Study on Pressurized Way of Partial Discharge Test for 330 kV Transformer

针对330 kV变压器局放试验,分析了试验加压方式并通过工程验证得出变压器低压绕组额定电压较高时,采用对称加压方法,试验设备额定电压可以降低为单边加压方案的一半,有利于提高工作效率。对称加压法试验时,对变压器高、低压绕组之间绝缘及中、低压绕组之间绝缘考核更为严格,低压绕组端子耐受电压情况更接近运行实际,有利于提高缺陷检出率,保证设备的安全投运。

For 330 kV transformer partial discharge test, this paper analyzed the pressurized way of tests. The engineering verifi ed that when the rated voltage of transformers low-voltage winding was higher, the symmetrical pressurized method was adopted and the rated voltage of test equipment could be reduced to half of the unilateral pressurized scheme, in favor of the improvement of work effi ciency. At the time of symmetrical pressurized test, the assessment of insulation between the high and the low voltage windings was more stringent, as well as the assessment of insulation between the medium and the low voltage windings. The withstand voltage of low voltage winding terminals ran closer to the actual situation, in favor of improving the defect detection rate and ensuring the safety operation of equipment.