Quantitative Evidences of Electrical Charges Creation at the Metal/Liquid Interface in Power Transformer Insulation Systems

A. Beldjilali
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Abstract

The aims of this work is linked to the problematic of electrical charges formation in power transformer insulation systems. After being qualitatively evidenced, this paper focuses on giving quantitative indications of the space charge injection process from metallic materials into dielectrics when these two materials are put in contact under electric stress. The Polarization and Depolarization Currents technique (PDC) is used to assess, in point of view of conduction process, different metal/insulating liquid interfaces. Three electrode systems of diffirent metallic nature (stainless steel, aluminium and brass) are associated with a transformer mineral oil. The metal/liquid/metal structures were submitted to a DC voltages and the electrical current circulating through the dielectric thickness was recorded with high sensitive electrometer. By integration of the measured response, the three cases are compared through the charge quantity involved. The obtained results meet well with the inj ection energetic barrier height at the metal/liquid contact. This is an additional proof of the physical assumption of charge creation, into the insulation system, by the transformer metallic compounds (windings, walls …).
电力变压器绝缘系统中金属/液体界面电荷产生的定量证据
这项工作的目的是与电力变压器绝缘系统中电荷形成的问题有关。在得到定性证明后,本文着重对金属材料与电介质在电应力作用下接触时空间电荷注入过程进行定量表征。利用极化和去极化电流技术(PDC)从导电过程的角度对不同的金属/绝缘液体界面进行了评价。三种不同金属性质的电极系统(不锈钢,铝和黄铜)与变压器矿物油有关。将金属/液体/金属结构置于直流电压下,用高灵敏度静电计记录通过介质厚度的电流循环。通过对实测响应的积分,通过所涉及的电荷量对三种情况进行了比较。所得结果与金属/液接触处的注入能垒高度吻合较好。这是通过变压器金属化合物(绕组、壁……)在绝缘系统中产生电荷的物理假设的另一个证明。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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