This course discusses the high-voltage system in hydroelectric power plants which includes equipment and conductors that carry current at transmission line-voltage, with their insulators, supports, switching equipment, and protective devices. The system begins with the high-voltage terminals of the step-up power transformers and extends to the point where transmission lines are attached to the switchyard structure. High-voltage systems include those systems operating at 69 kV and above, although 34.5-kV and 46-kV systems that are subtransmission-voltage systems are also covered in this discussion. Course Outline 1. POWER TRANSFORMERS 2. ELECTRICAL CHARACTERISTICS 3. HIGH VOLTAGE SYSTEM This course will give electrical engineers and other design and construction professionals an introduction to the design, construction and safety considerations for high voltage systems in hydroelectric power plants

Learning Objectives

• Learn about three-phase transformers used for generator step-up;
• Learn how to employ forced air cooling systems for transformers;
• Learn about FOA Class transformers;
• Learn about basic impulse insulation levels;
• Learn how to safely design low-voltage leads between the transformer and generator;
• Learn about oil preservation systems; and
• Learn the importance of online dissolved gas monitoring systems.