The book "Relay protection and automation of power supply systems: methodological instructions for laboratory work in the discipline "Relay protection" is an indispensable resource for students and specialists in the field of electrical engineering and energy . Compiled by a team of authors working in leading educational institutions and scientific institutions, it offers a deep immersion in one of the most important and relevant topics of modern electrotechnical education. On the pages of this book, readers will find detailed methodological guidelines that will help them not only to master the theoretical aspects of relay protection, but also to apply the knowledge gained in practice. The book covers a wide range of laboratory work, which is aimed at studying the principles of relay protection and automation in power supply systems. Each laboratory work is accompanied by clear instructions, diagrams and examples, which makes the learning process more accessible and understandable. This book will be especially useful for students of technical universities studying in specialties related to electrical engineering, energy and automation. It will also interest young professionals who are just beginning their journey in this field, as well as teachers looking for quality teaching materials for their classes. If you are passionate about electrical engineering, strive to understand how protection and automation systems work, and want to deepen your knowledge, this book will become a real assistant for you. The topics raised in the book cover many aspects, such as the principles of relay operation, methods of diagnostics and protection of electrical systems, as well as modern technologies used in relay protection. The authors emphasize the importance of reliability and security of electricity supply, which makes this work relevant in light of the current challenges facing the energy industry. With the constant growth of electricity consumption and increasing load on the grid, knowledge of the basics of relay protection becomes not only useful, but necessary. The style of the authors is distinguished by clarity and accessibility of the presentation, which allows even complex technical concepts to be presented in an understandable form. They use many illustrations and diagrams, which makes the material more visual and easy to perceive. The book also includes examples from practice that help readers see how theoretical knowledge is applied in real-world settings. If you are looking for literature that will help you understand the intricacies of relay protection and automation, pay attention to other works of the authors, such as "Basics of Electrical Engineering" and "Electrical Machines and Apparatus" These books can also be a great addition to your educational process. “Relay protection and automation of power systems” is not just a tutorial, but a whole world of knowledge that will help you become a professional in your field. Do not miss the opportunity to immerse yourself in the study of relay protection and automation, which are the basis for the stable operation of electrical systems. This book will be your reliable companion on the way to success in the world of electrical engineering!