tailieunhanh - Lesson power electronics: Power Equipments in Electric Transmission System

The document consists of 7 contents about Introduction to Power Equipments on Transmission System, Reactors and Applications, instrument Transformers, power Transformers and Special Phase Shifting XFMR- for Control over Active Power Flows, circuit breakers, surge Arresters, transmission Capacitor Bank technologies, intro to High Voltage DC Transmission, IEEE and IEC Standards | BÀI GIẢNG Trang Thiết Bị Điện trên Hệ Thống Truyền Tải Điện Power Equipments in Electric Transmission System Công Ti Truyền Tải Điện 4 Tháng Giảng viên: Nguyễn Hữu Phúc Khoa Điện- Điện Tử Đại Học Bách Khoa TP HCM Outline 1. Introduction to Power Equipments on Transmission System 2. Reactors and Applications 3. Instrument Transformers: Current Transformers and Voltage Transformers 4. Power Transformers (Three Winding XFMR) and Special Phase Shifting XFMR- for Control over Active Power Flows 5. Circuit Breakers 6. Surge Arresters 7. Transmission Capacitor Bank Technologies 8. Intro to High Voltage DC Transmission 9. IEEE and IEC Standards 1. Introduction Electric power transmission Electric-power transmission is the bulk transfer of electrical energy, from generating power plants to electrical substations located near demand centers. Transmission lines, when interconnected with each other, become transmission networks. •Historically, transmission and distribution lines were owned by the same company, but starting in the 1990s, many countries have liberalized the regulation of the electricity market in ways that have led to the separation of the electricity transmission business from the distribution business.[1] System Most transmission lines use high-voltage three-phase alternating current (AC), although single phase AC is sometimes used in railway electrification systems. High-voltage direct-current (HVDC) technology is used for greater efficiency in very long distances (typically hundreds of miles (kilometres), or in submarine power cables (typically longer than 30 miles (50 km)). HVDC links are also used to stabilize against control problems in large power distribution networks where sudden new loads or blackouts in one part of a network can otherwise result in synchronization problems and cascading failures. Overhead transmission High-voltage overhead conductors are not covered by insulation. The conductor material is nearly always an aluminium .