Review Progress on Insulation Condition Assessment of Oil Immersed Power Transformer Based on Dielectric Response Characteristics

doi:10.11985/2020.04.001

Abstract

Abstract:

The reliable assessment of insulation state of oil immersed power transformer is related to the safe and stable operation of the whole power system. Owing to the advantages of convenient measurement, slight environmental interference, abundant insulation information, and strong sensitivity of insulation problems, the dielectric response characteristics of oil immersed power transformer are applied to the insulation state assessment of transformer by many experts and scholars at home and abroad and a lot of research work is carried out. The measurement method and principle of dielectric response characteristics are described, focusing on qualitative analysis of dielectric response curve with transformer insulation state, extraction of new dielectric response characteristic parameters and mutual fusion of multi-dimensional dielectric response characteristics. It points out the problems and shortcomings of existing research, and prospects the future research direction of the dielectric response characteristics in the transformer insulation state assessment according to the development of smart grid.

Key words: Oil immersed power transformer, dielectric response, insulation condition evaluation, intelligent fusion

CLC Number:

TM411

YU Hao, HUANG Yanqin, YIN Junyi, MENG Guodong, CHENG Yonghong. Review Progress on Insulation Condition Assessment of Oil Immersed Power Transformer Based on Dielectric Response Characteristics[J]. Journal of Electrical Engineering, 2020, 15(4): 1-17.

Figures/Tables 12

References 82

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检测方法	优点	缺点	主要结论
PDC	对于变压器绝缘状态变化的反应较灵敏、测量设备简单,现场测量容易实现	测量容易受到电荷累积的影响,初始极化去极化电流难以测量,高频信息损失严重	曲线的起始部分主要由绝缘油的老化状态决定,而曲线的中间部分主要和绝缘结构、形状等因素有关,曲线的末端部分则主要受到绝缘纸的影响
RVM	测量设备简单,现场测量容易实现	除了包含PDC方法的缺点外,对变压器绝缘状态映射不够精准、全面,只能得到油纸绝缘的老化整体状况	绝缘老化和水分含量会导致极化谱主时间常数显著减小
FDS	测量不会受到介质空间电荷积累的影响;携带绝缘信息更加丰富、能够对变压器不同绝缘位置、结构和不同绝缘问题类型进行更准确评估	在低频测量时,耗费时间太长	FDS曲线的低频和高频部分反映的是绝缘微水和老化状态的作用,而曲线中间部分则受到油电导率和绝缘几何结构影响