VFT PHASE VOLTAGE MEASUREMENT IN THREE-PHASE ENCLOSED GIS

• 作者: Jianhua(邹建华) Li Yang(李洋) Yue Ziding(岳子丁) Zou
• 来源期刊: 西安交通大学学报：英文版
• 学科: 工学
• 关键词: gas insulated substation(GIS) very fast transients(VFT) VOLTAGE MEASUREMENT electric field ANALYTIC expression MEASUREMENT apparatus VFT phase VOLTAGE wave
• 年，卷（期）: 2002,（2）
• 页码范围: 101-108
• 页数: 8页
• 分类号: TN933

摘要

The measuring of VFT phase voltage in three-phase enclosed GIS is more complex and difficult than in single-phase ones. There are 3 capacitive sensors in the measuring system, the outputs of which are with a linear relation to the three phase voltages. This linear relation is presented with a factorial matrix. Because each capacitive sensor is coupled with the electric field of three phases (A, B, and C), the electric coupling coefficients are introduced. In order to determine the matrix of electric coupling coefficients, the numerical calculation method can be used. From the discussion on two types of three-phase enclosed GIS bus, i.e. standard arrangement and biased arrangement, the dominant electric coupling coefficients are named, which can be simply and approximately calculated by an analytic expression. Finally, as an example, the waveforms of VFT phase voltage generated on a three-phase enclosed GIS bus model are displayed. When a capacitive sensor is located at the 'shortest point' of phase A (or B, or C), the VFT phase voltage VA (or VB, or VC) can almost be measured by that capacitive sensor alone.