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在电网设备中,最常见的设备之一电力变压器具有非常重要的地位,变压器发生故障会造成巨大的经济损失[1]。根据统计[2],变压器故障大多数起源于各种原因导致的局部放电,对变压器局部放电的检测手段中,基于超高频的带电检测手段由于强大的抗干扰能力和空间定位能力被公认为最具有发展潜力的新兴技术[3]。但是在现场实施过程中,由于变压器规格的差异性导致安装信号传感器的阀门类型不同,有球阀、闸阀、蝶阀等多种类型。其中蝶阀由于其结构特殊性对传感器结构有不对称的要求,本文研究了可兼容蝶阀的标准化变压器超高频带电检测传感器的设计。 相似文献
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Identification of the aging condition and the failure probability of oil-paper insulation in transformer is important for improving the reliability of electric power transmission system and applying life cycle cost (LCC) management to electrical equipment. Based on data obtained in a series of multi-accelerated-aging experiments, two approaches for calculating failure probability of oil-paper insulation were compared in aspects of degree of polymerization (DP) and condition ranking. In the experiments, mineral oil and cellulose paper are sub- jected to electrical and thermal stresses, and several parameters, including dissolved gases’ volume fraction, furfural content, moisture content, and degree of polymerization, are measured after the aging process. Results show that weight of carbon oxide, which has a close relationship with cellulose paper degradation, is much higher in DP model than in condition ranking model. Moreover, it is concluded that DP model is more practically accurate than condition ranking model, because aging of cellulose paper rather than mineral oil is the key and critical factor of oil-paper insulation aging. 相似文献
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基于自积分Rogowski线圈的脉冲电流传感器的建模研究 总被引:1,自引:0,他引:1
自积分式Rogowski线圈的体积小、频率响应高,是测量脉冲大电流信号的理想手段。本文分析了Rogowski线圈测量脉冲电流的原理,建立了自积分式Rogowski线圈分布式参数模型,分析了影响线圈频率特性的主要因素,采用电磁场数值分析方法建立了线圈三维电磁场模型,提取了线圈的电感、电容参数。利用求取的参数及等效电路,对其开环特性、闭环转移阻抗及相关影响因素进行仿真,仿真与实验结果对比表明了所建立电路模型的合理性,同时验证了参数的准确性。 相似文献