The insulation system in a transformer degrades over time and it needs periodic monitoring
for uninterrupted operation of the power system network. Moisture content (MC), acid …

This paper describes precise tests of frequency–temperature relations of the phase shift
angle and admittance of a reference sample of composite of cellulose and insulating oil with …

Space charge ellipsometry detection method provides an effective technical means to clarify
the charge accumulation mechanism under transient stress, which can support the reliable …

The aim of the work was to prepare and test a paper-oil insulation system according to the
recommendations of CIGRE (Conseil International des Grands Réseaux Électriques) with …

Moisture ingress is one of the major causes of aging in oil–paper insulated transformers; the
measurement of the moisture content of the insulating material is thus necessary during …

The aim of this study was to perform precision measurements of the frequency-temperature
dependences of the loss angle tangent of the liquid-solid composite with the FDS Dirana …

Power electronic transformer insulation systems endure extended periods of operation
under challenging conditions characterized by the interaction of electrical and thermal …

Here, a new device is presented to supervise the ageing process of insulating oils used in
power transformers. It is based on the use of a microstrip antenna whose electrical …

针对油纸绝缘变压器老化会对其等效电路产生影响, 通过分析回复电压谱线与等效电路参数的
函数关系, 提出回复电压微分解谱法确定等效电路极化支路数, 解决了长期以来变压器等效电路 …

Power transformers and their performance and reliability in electric power networks are
important research issues of power systems. Much information has already been collected …