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 re...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 V A (or V B, or V C) can almost be measured by that capacitive sensor alone.展开更多
2004年初,世界上第一台可变频变压器(Variable frequency transformer,(VFT))在加拿大魁北克成功地正式投入运行,为实现加拿大魁北克—美国纽约大电网之间的柔性异步联网,核心装备是100MW新型可变频变压器(VFT)。VFT是国际上第四代FACT...2004年初,世界上第一台可变频变压器(Variable frequency transformer,(VFT))在加拿大魁北克成功地正式投入运行,为实现加拿大魁北克—美国纽约大电网之间的柔性异步联网,核心装备是100MW新型可变频变压器(VFT)。VFT是国际上第四代FACTS新技术,是新型旋转型控制器,是"面—面"式异步联网关键设备,是集成创新成果,是智能电网的新型技术设备。基于对VFT的理论分析、本文提出VFT的设计理念,并对研制VFT的技术进行探索,同时探讨在我国研制新型VFT装置的创新思路和方向。展开更多
文摘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 V A (or V B, or V C) can almost be measured by that capacitive sensor alone.
文摘2004年初,世界上第一台可变频变压器(Variable frequency transformer,(VFT))在加拿大魁北克成功地正式投入运行,为实现加拿大魁北克—美国纽约大电网之间的柔性异步联网,核心装备是100MW新型可变频变压器(VFT)。VFT是国际上第四代FACTS新技术,是新型旋转型控制器,是"面—面"式异步联网关键设备,是集成创新成果,是智能电网的新型技术设备。基于对VFT的理论分析、本文提出VFT的设计理念,并对研制VFT的技术进行探索,同时探讨在我国研制新型VFT装置的创新思路和方向。
