The book "Fundamentals of the theory of construction of measuring bodies of relay protection and automation (copy)" by Fabrikant B. L. is an in-depth and comprehensive study focusing on one of the key areas of electrical engineering relay protection and automation. This edition will become an indispensable assistant for students of technical universities, specialists in the field of electricity, as well as anyone interested in modern technologies in the field of protection of electrical systems. In his book The Fabricator V. L. examines in detail the principles of the measuring bodies, their design and implementation in relay protection systems. The author shares his knowledge and experience, explaining how to choose and configure equipment correctly to ensure reliable protection of electrical installations from various emergency situations. The book covers a wide range of topics, including the basics of measurement theory, methods of analysis and synthesis of relay systems, as well as current trends in the field of process automation. For those who want to deepen their knowledge in the field of relay protection, this work will become a real storehouse of information. The manufacturer not only describes the theoretical aspects, but also shares practical recommendations, which makes the material accessible and understandable. Readers will be able to find many examples, illustrations and schemes in the book that will help them better understand complex concepts and apply them in practice. The book will be of interest not only to students and graduate students, but also to practicing engineers working in the field of electricity and automation. It will be a useful reference for those involved in the design and operation of relay protection systems, as well as for teachers who want to enrich their courses with actual knowledge and examples from real practice. The topics raised in the book concern not only technical aspects, but also issues of safety, reliability and efficiency of electrical systems. The manufacturer emphasizes the importance of the correct choice of equipment and its configuration, which can significantly affect the safety of electrical installations. This is especially true in the modern world, where the reliability and security of energy systems are becoming key factors for the successful functioning of the economy. The author's style is distinguished by clarity and logical presentation, which makes it easy to perceive even the most complex topics. Fabricant B. L. He is known for his work in electrical engineering and automation, and his experience is reflected in every page of this book. Readers familiar with his previous publications will appreciate the consistency and depth of the analysis, which became the hallmark of his scientific approach. If you are looking for a book that will help you understand the intricacies of relay protection and automation, “Fundamentals of the theory of construction of measuring organs of relay protection and automation (copy)” will become your reliable companion in this difficult but fascinating world. Do not miss the opportunity to enrich your knowledge and skills that will be useful both in studies and in professional activities . This book is not just a textbook, but a real encyclopedia for all who seek perfection in the field of electrical engineering.