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In order to reveal the interval laws of wind power time series, the phase space reconstruction which is on the basis of chaotic time series theory is used to identify the chaotic feature of wind power time series. Considering the different effects of different coordinate of phase points on predicted point, this pa per improves the distance criterion and the evolutional trend criterion by weighting...
As the growing emphasis on high voltage direct current (HVDC) transmission in power system, the reliability of converter transformer that is the vital equipment in DC transmission system becomes more important. The insulation system of converter transformer is mainly composed of insulating oil and pressboard, therefore the studies on DC voltage endurance (V-t) characteristics of the oil-impregnated...
The mineral insulating oil and pressboard are important insulation dielectrics in AC-DC converter transformers. Thus, it is very significant to understand the dielectric properties of the oil and oil-impregnated pressboard. In this paper, the influences of the temperature, field strength and aging on the resistivity of oil and oil-impregnated pressboard have been investigated. Samples used in the...
Safety operation of total ultra-HVDC transmission system could be directly affected by the operation reliability of converter transformer which is one of the most important equipments in the system. The transformer oil is the main liquid dielectric medium in the converter transformer. Thus, it is significant to study the dielectric properties of the transformer oil. In this paper, the dc resistivity...
As we know, streaming electrification due to oil flow is an important phenomenon in power transformers particularly on those high rated voltage ones, and the study around it is still a challenge. In this paper, the streaming electrification characteristic of insulation mineral oil from Nynas was studied by using an improved mini-static tester to measure the electrostatic charging tendency (ECT) of...
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