In order to study the corona onset characteristic of the positive conductor in the UHV corona cage, the charge simulation method is applied to calculate the space electric field and corona onset voltage of the stranded conductor in the corona cage. Each strand is simulated by 8 space charges, based on the corona sustainable criterion in extreme uneven electric filed and the secondary emission process of the photoelectrons. The corona loss test of the single aluminum cable steel reinforced (LGJ)900-75, 6*LGJ900-75, 8*LGJ400-35 conductors in dry and rain conditions is done in the UHV corona cage, and the chosen rain rate are 2.4mm/h, 20mm/h and 30mm/h. The tangent line method is used to determine the test corona onset voltage, and the comparative study proves that the calculation model can be used to calculate the positive corona onset voltage of the bundle conductors in the UHV corona cage. A further analysis shows that: the positive corona onset voltage increases with the bundle number, and decreases with the bundle space and also increases with the diameter of the sub -conductor; the surface irregularity coefficient decreases with the rain rate, while at the same time, it tends to be saturated.

In order to study the corona onset characteristic of the positive conductor in the UHV corona cage, the charge simulation method is applied to calculate the space electric field and corona onset voltage of the stranded conductor in the corona cage. Each strand is simulated by 8 space charges, based on the corona sustainable criterion in extreme uneven electric filed and the secondary emission process of the photoelectrons. The corona loss test of the single aluminum cable steel reinforced (LGJ)900-75, 6*LGJ900-75, 8*LGJ400-35 conductors in dry and rain conditions is done in the UHV corona cage, and the chosen rain rate are 2.4mm/h, 20mm/h and 30mm/h. The tangent line method is used to determine the test corona onset voltage, and the comparative study proves that the calculation model can be used to calculate the positive corona onset voltage of the bundle conductors in the UHV corona cage. A further analysis shows that: the positive corona onset voltage increases with the bundle number, and decreases with the bundle space and also increases with the diameter of the sub -conductor; the surface irregularity coefficient decreases with the rain rate, while at the same time, it tends to be saturated.

The variation of negative dc corona inception voltages with air pressure and humidity, using a point/plane electrode system, was studied using a perspex chamber in which the pressure and humidity could be varied. A method of calculation was developed to determine the corona inception voltages over a range of air pressures and humidities. The effective ionization coefficient was calculated as a linear interpolation of the effective ionization coefficients for dry air and water vapor. The validity of these calculations was confirmed by a series of experimental determinations of the corona inception voltages for the same range of pressures and humidities. A comparison of the negative and positive corona inception mechanisms was also made. Both the negative and positive corona inception voltages decreased with a decrease in the air pressure and an increase in the humidity. The greater values of the effective ionization intensity found in the critical zone for the negative corona accounted for their lower inception voltages. The mechanisms of the affect of the photo-absorption coefficient and Townsend's second coefficient on the negative and positive corona were also considered.

为进一步了解低气压下覆冰对绝缘子的危害，该文选择冰柱-冰板间隙模型，借助数据采集卡、紫外线成像仪和自行设计的电流传感器等设备，在人工气候室内研究低气压下冰柱-冰板模型的电晕放电特性。文章分析了气压对冰柱-冰板间隙的起晕电压、平均放电量和冰柱尖端处的放电区域等方面的影响。结果表明：起晕电压随着气压的降低而降低，平均放电量和冰柱尖端处的放电区域均随着气压的降低而减小，同时，在较低气压下，起始放电更容易形成辉光放电，放电测量也更困难。

为进一步了解低气压下覆冰对绝缘子的危害，该文选择冰柱-冰板间隙模型，借助数据采集卡、紫外线成像仪和自行设计的电流传感器等设备，在人工气候室内研究低气压下冰柱-冰板模型的电晕放电特性。文章分析了气压对冰柱-冰板间隙的起晕电压、平均放电量和冰柱尖端处的放电区域等方面的影响。结果表明：起晕电压随着气压的降低而降低，平均放电量和冰柱尖端处的放电区域均随着气压的降低而减小，同时，在较低气压下，起始放电更容易形成辉光放电，放电测量也更困难。

During energy conversion, material production, and metallurgy processes, reactions often have the features of unsteadiness, multistep, and multi-intermediates. Thermogravimetry-mass spectrum (TG-MS) is seen as a powerful tool to study reaction features. However, reaction details and reaction mechanics have not been effectively obtained directly from the ion current of TG-MS. Here, we provide a method of an equivalent characteristic spectrum analysis (ECSA) for analyzing the mass spectrum and giving the mass flow rate of reaction gases as precise as possible. The ECSA can effectively separate overlapping ion peaks and then eliminate the mass discrimination and temperature-dependent effect. Two example experiments are presented: (1) the decomposition of CaCO3 with evolved gas of CO2 and the decomposition of hydromagnesite with evolved gas of CO2 and H2O, to evaluate the ECSA on single-component system measurement and (2) the thermal pyrolysis of Zhundong coal with evolved gases of inorganic gases CO, H2, and CO2, and organic gases C2H4, C2H6, C3H8, C6H14, etc., to evaluate the ECSA on multi-component system measurement. Based on the successful calibration of the characteristic spectrum and relative sensitivity of specific gas and the ECSA on mass spectrum, we demonstrate that the ECSA accurately gives the mass flow rates of each evolved gas, including organic or inorganic gases, for not only single but multi-component reactions, which cannot be implemented by the traditional measurements.

污秽绝缘子在一定的湿度条件下会形成放电并辐射出紫外光信号, 本文提出了一种基于日盲紫外成像的污秽状态评估方法。首先在人工气候室中研究了几种不同污秽度的绝缘子在不同湿度下的放电现象, 通过对放电视频信号的分析并结合图像处理算法提取了平稳紫外光斑面积、间歇性紫外光斑面积以及间歇性紫外光斑重复次数三个特征参数。由于污秽放电具有一定的随机性, 而基于视频和图像分析法提取的特征参数具有模糊性, 论文采用了模糊逻辑推理的方法建立了绝缘子的污秽状态评估模型, 测试表明该推理模型具有较高的准确性和稳定性。

污秽绝缘子在一定的湿度条件下会形成放电并辐射出紫外光信号, 本文提出了一种基于日盲紫外成像的污秽状态评估方法。首先在人工气候室中研究了几种不同污秽度的绝缘子在不同湿度下的放电现象, 通过对放电视频信号的分析并结合图像处理算法提取了平稳紫外光斑面积、间歇性紫外光斑面积以及间歇性紫外光斑重复次数三个特征参数。由于污秽放电具有一定的随机性, 而基于视频和图像分析法提取的特征参数具有模糊性, 论文采用了模糊逻辑推理的方法建立了绝缘子的污秽状态评估模型, 测试表明该推理模型具有较高的准确性和稳定性。