Relay protection and automation of the 150/35/10 kV substation «Uman»
Students Name: Kharchuk Valeriia Oleksandrivna
Qualification Level: magister
Speciality: Electric Power Generation and Distribution Management Systems
Institute: Institute of Power Engineering and Control Systems
Mode of Study: full
Academic Year: 2022-2023 н.р.
Language of Defence: ukrainian
Abstract: Cable lines suffer the most damage compared to other equipment because they are long, especially overhead lines. For immediate shutdown in the event of damage to them, they must be equipped with relay means. Line protections are very diverse, but they are mainly determined by the scheme of the electrical network, the voltage of the network, as well as the suitability of the consumers being fed. All relay protection devices must provide protection against multi-phase and single-phase earth faults. Modern digital transformer protections are developed as multifunctional complexes. That is, one device can perform the functions of differential protection, protection against overcurrents of external electric currents, protection against overloads, protection against short circuits to the ground, perform the functions of measurement, registration of parameters of emergency modes, some functions of automation, control, etc. In addition, the main characteristics of digital protections and automation have significantly better indicators than protections implemented using electromechanical or semiconductor elements [1]. The object of the study is the Uman 150/35/10 kV electrical substation. An analysis of the output data of the substation was carried out, namely, power equipment and relay protection and automation at the substation. The protection was developed and the operation parameters of the digital protection of the cable line and transformer were calculated. 5 This will ensure increased reliability of electricity supply to consumers. The subject of the study is relay protection and automation of the 150/35/10 kV Uman substation. Relay protection devices are designed so that each of them covers a certain section of the electrical system. These areas are called protection zones. The area of ??protection can be a generator, transformer, power transmission line, etc. The area of ??operation can cover several elements of the power network, for example, a power transmission line - a transformer. If the damage occurs within this zone, then the relay protection of the zone must work and act to turn off those switches through which power is supplied to the location of the damage. When designing relay protection devices, it is necessary to ensure that the following conditions are met: - relay protection devices must cover all the equipment of the electric power system, there cannot be a single section, even within the limits of a separate element, that would not be covered by the relay protection zones; - zones of action of relay protection devices of adjacent sections of the electric power system must overlap; - to increase reliability, the operation of individual relay protection devices must be duplicated, that is, each section of the power system must be protected by at least two independent relay protection devices (100% redundancy), for responsible sections it is possible to use three independent relay protection devices (200% redundancy) [1 ] The purpose of the study: to analyze the raw data; characterize a fragment of the existing electrical network, its geographical location, climatic conditions; input data of PS "Uman"; investigate damage to cable and overhead lines and protection against them; provide a description of the digital terminal of the Relsys concern; calculate short-circuit currents, analyze protection against interphase and single-phase short circuits; calculate the operation parameters of the digital protection of the cable line, calculate the operation parameters of the digital protection of the transformer; carry out differential protection, 6 gas protection, protection against overcurrents of external short circuits and protection against overloads; check current transformers; perform automatic reserve input at the substation.