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This bundle contains the full lecture notes of the course EE685: Power System Protection taught by Prof. S.A. Soman from IIT Bombay. It covers topics from Modern power systems to Power system structures with Real-world scenarios and practice problems.

Module 1: Introduction Lecture 1: Modern Power Systems Objectives: In this lecture, you will learn the following Evolution of power systems: significant milestones. Structure of a bulk power system network. What is a synchronous grid? Why is grid frequency standardized?

Module 1: Introduction Lecture 2: Why make interconnections? Objectives: In this lecture, you will learn the following Why are power systems interconnected? What is the concept of reliability? Why is it more economical to interconnect a power system? Identifying the significant elements of a practical interconnected power system.

Module 1: Introduction Lecture 3: Operating States Objectives: In this lecture, you will learn the following Operational Objectives of a Power System. Hierarchical Control in Power Systems. Issues of ownership and coordination. Definition of various operating states, nature of various control actions, and their significance. An overview of what you will learn in this course.

Module 2: Equipment and Stability Constraints in System Operation Lecture 4: Introduction Objectives: In this lecture, you will learn the following What is the nature of constraints faced in power system operation? What are the various types of equipment constraints?

Module 2: Equipment and Stability Constraints in System Operation Lecture 5: Generator Constraints Objectives: In this lecture, you will learn the following Nature of generator constraints. Generator Capability curves. The typical rating of a large synchronous generator.

Module 2: Equipment and Stability Constraints in System Operation Lecture 6: Transmission Line constraints Objectives: In this lecture, you will learn the following Thermal and dielectric limitations of a transmission line. Effect of loading on voltages, for long-distance ac transmission. AC line loadability (power transmission capability) versus distance.

Module 2: Equipment and Stability Constraints in System Operation Lecture 7: Insert: Numerical Solution of Differential Equations Objectives What does one mean by stability? What is angular stability? Dynamical equations for a single machine -infinite bus system. Equilibrium points.

Module 2: Equipment and Stability Constraints in System Operation Lecture 7a: Numerical Solution of Differential Equations Objectives: In this lecture, you will learn the following How does one simulate the behavior of a dynamical system numerically? Runge-Kutta Fourth-order method

Module 2: Equipment and Stability Constraints in System Operation Lecture 8: Large disturbance Angle stability Objectives: In this lecture, you will learn the following Spring Mass analogy of a single machine infinite bus system. Significant disturbance angular instability is demonstrated using an example. Angular stability in multimachine systems. Impact of angular stability problems on system operation.