Analysis of the Features of Implementing Differential Protections of Extra High Voltage Power Transmission Lines

DOI: https://doi.org/10.15276/eltecs.43.119.2025.7
Keywords: Keywords: relay protection, differential protection, differential-phase protection, high-frequency protection, extra-high voltage line, transients, short circuits, modeling, power system.

Abstract

Abstract. Nowadays, there is a need for constant analysis of the operation of relay protection and improvement of the principles of its implementation, due to the fact that microprocessor technologies are rapidly developing and being implemented in relay protection. The purpose of the research is to develop directions for improving protection and ensuring the correct operation of differential-phase protection of 750 kV lines based on microprocessor devices. Therefore, the objectives of this study are an in-depth analysis of the principle of operation of this protection and determining directions for solving the problem. The scientific value is to actualize the problem for improving the algorithm of operation of differential-phase high-frequency protection of extra-high voltage lines. The practical significance of the research lies in increasing the efficiency of relay protection of the country's power system. There is used the method of analysis of the available scientific and technical literature to identify the problem in this paper. There are considered both existing protections and the principles of their operation, as well as new theoretical and experimental models of protections that have not yet been implemented. The characteristics of protections and the features of the scope of application are analyzed. Difficulties were identified in implementing the differential phase protection algorithm in microprocessor terminals specifically for long extra-high voltage lines of 330-750 kV. Lines of this voltage have a large capacitive component, which leads to the appearance of complex transients. These processes affect both the value of the measured parameters and the quality of the signal transmitted over the high-frequency channel. All this affects the selectivity of operation and increases the time of protection operation, thereby reducing the stability of the power system. The result of the research is confirmation of the relevance of the problem and the determination that an effective way to solve this problem is to build a mathematical model of the research object for further in-depth consideration. There was established that the problem of implementing microprocessor protection of extra-high voltage lines is not solved based on the analysis of scientific and technical literature. New directions in solving this problem are proposed by improving the algorithm of protection to ensure the stability of the unified power system of Ukraine.There is established that an effective way to solve this problem is to build a mathematical model of a specific extra-high voltage line of Ukraine and study the operation of a new method of protecting such lines.

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Publisher – Odesa Polytechnic National University The journal publishes the results of scientific research concerning the development of modern automated electromechanical systems, the design of electromechanical converters and electrical apparatus, mechatronics, computer systems and their components, information intelligence systems, computer networks, modeling of dynamic systems, as well as information security in computer systems. The journal reflects mathematic modeling and optimization of electrotechnical and electromechanics systems, ways of electric drives control allowing to saving energy, modern systems of power supply. Besides that, the materials about automatic control systems and systems of artificial intelligence are published in the journal. The journal is designed for engineers and scientists that take part in researches, designing and exploitation of electrical and computer systems and their components, and also for corresponding specialty teachers and students of high school. The journal is printed according to the decision of the scientific council of Odesa Polytechnic National University from 30.09.2025, No. 3
Published
2025-10-03
Issue
No. 43 (119) (2025): ELECTRICAL AND COMPUTER SYSTEMS
Section
Energy Saving by means of Modern Electrical Engineering
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