CAJ | 학술논문

为了研究变压器内部绝缘纸板缺陷的局部放电特征和缺陷发展过程,构建了针板结构的纸板局部放电模型,利用阶梯升压法研究了长期外加电压作用下,绝缘纸板从起始放电到被击穿的整个缺陷发展过程中窄带脉冲电流信号的散点图、脉冲重复率、脉冲视在放电量平均值及最大值的变化过程;通过拍照的方式研究了局部放电所产生的气泡溢出现象和纸板表面炭痕扩展情况。结果表明：针板放电具有阶段性发展模式;当放电脉冲的重复率、放电量急剧增加、脉冲的相位分布范围展宽到越过0°和180°时,可以断定缺陷处于急剧发展、临近击穿的阶段,在此之前,缺陷的发展相当缓慢。
위료연구변압기내부절연지판결함적국부방전특정화결함발전과정,구건료침판결구적지판국부방전모형,이용계제승압법연구료장기외가전압작용하,절연지판종기시방전도피격천적정개결함발전과정중착대맥충전류신호적산점도、맥충중복솔、맥충시재방전량평균치급최대치적변화과정;통과박조적방식연구료국부방전소산생적기포일출현상화지판표면탄흔확전정황。결과표명：침판방전구유계단성발전모식;당방전맥충적중복솔、방전량급극증가、맥충적상위분포범위전관도월과0°화180°시,가이단정결함처우급극발전、림근격천적계단,재차지전,결함적발전상당완만。
In order to propose the criteria of diagnosing the severity of carbon trace defects on the insulation paper in transformers,the developing processes of the defects were researched.A needle-plate model was established for long-term high voltage test.The high voltage was increased step-by-step from the partial discharge inception voltage until the model was broken down.During the narrow frequency band pulse current signals,the gas bubbles and the carbon trace were recorded to study their changing process.The point figures,pulse rate,pulse average amplitude and maximum amplitude were used.The results show that the needle-plate model has a complicated developing process.When the rate and amplitude of the pulses increase sharply,and the phase range of the pulses expends widely and crosses 0 degree and 180 degree,the defect is in the stage of rapid development and near the breakdown.