Under the Digitalization Program, developed by the Russian Ministry of Energy, modernization of electrical power engineering complex and transition to “digital” substations is expected in the period of 2018-2022. Special attention should be given to the question of digital substations designing as the hardware layout and the architecture of relay protection, automatic and control system are worked out at this stage. Nowadays there is no internal Russian standard referred to IEC 61850 as well as any normative and technical documentation. So in all digital substations projects various solutions are used for organization of relay protection, automatic and control system that makes it difficult to assess the adequacy and sufficiency of the proposed technical solutions and affects negatively to the time of project documentation development and to the terms of equipment manufacturing.
Combined architecture of digital substation was taken by the specialists of Giprotyumenneftegas and EKRA as the basis of designed 110/35/10 kV digital substation. Automatization system of projected digital substation is realized as the software and hardware complex based on digital equipment and fiber optic communications, united by unified data transfer protocol by IEC 61850 standard. The hardware and software base of designed 110/35/10 kV digital substation is represented by two dubbed cabinets of centralized intelligent electronic devices (1, 2). Every device is a block, performed on modular basis, where each module has certain functions and could be managed independently from other modules.
Combined architecture allowed to create a scalable automatic system of control, operation, protection, collection, transmission and processing of information, built on a multilevel centralized principle. The proposed approach makes it possible to simplify the schemes of secondary commutation by making closer of digital signals sources to primary equipment, reducing the number of inter-cabinet cables. Classical microprocessor terminals in combination with electromagnetic current and voltage transformers, used as the connection controllers, allowed to reduce the number of necessary DMU and AMU devices. In addition, the usage of individual terminals for each 10 kV connection allows to ensure the stability of relay protection and automatic system, while keeping the high quality properties and reliability of the classical substation.
1. Mikhaylenko O., Digital substation: The challenges of time (In Russ.), Rukovodyashchie materialy po proektirovaniyu i ekspluatatsii elektricheskikh setey, 2017, no. 5, pp. 36–39.2. Aleksinskiy S.O., Architectural solutions versions of relay protection system and automations of 110–220 kW “digital substation” (In Russ.), Vestnik IGEU, 2011, no. 1, pp. 42–47.