谐波电压对纤维素绝缘纸短时电老化特性的影响研究

Study on Influence of Harmonic Voltage on Short-time Electrical Aging Characteristics of Cellulose Insulating Paper

纤维素绝缘纸是电力系统电力变压器的主要绝缘介质,其电老化性能直接关系到变压器及电网的安全稳定运行。为了研究实际运行变压器绝缘纸的短时电老化特性,采用纤维素绝缘纸与变压器油作为试验材料,测试了纤维素绝缘纸在不同次数与含量的谐波电压与交流基波电压下的击穿电压,获得了纤维素绝缘纸的短时电老化特性。结果表明,谐波电压对纤维素绝缘纸的短时电老化特性影响明显,随着谐波含量的增加,纤维素绝缘纸的击穿电压减小。此外,随着谐波次数的增加,纤维素绝缘纸的击穿电压减小。

Cellulose insulating paper is the main insulating medium of power transformer in power system.In order to study the short-time electrical aging characteristics of the insulating paper of transformer in practical operation,cellulose insulating paper and transformer oil were used as the test materials.The breakdown voltage of the cellulose insulating paper under the harmonic voltage of different orders and contents and the AC fundamental voltage was measured,and the short-time electrical aging characteristics of the cellulose insulating paper were obtained.The results show that the influence of harmonic voltage on the short-time electrical aging characteristics of cellulose insulating paper is obvious.With the increase of harmonic content,the breakdown voltage of cellulose insulating paper decreases.In addition,with the increase of harmonic order,the breakdown voltage of cellulose insulating paper decreases.