Study of mutual influence of measuring part elements of transformer differential protection and its impact on the primary signal processing

Abstract

Calculation of relay protection (RP) settings ensuring its adequate functioning under specific operating conditions is extremely difficult task. The main prerequisite for solving this problem is availability of a detailed analysis of functioning of key elements of RPs schemes in the specific conditions of its operation. That is possible to do with adequate RPs mathematical models and modern EPS simulators. Based on developed by authors approach for detailed RPs simulation the models of the whole circuit of measuring part (MP) of numerical transformer differential protection were developed for different types of auxiliary transformers and low-pass filters. A comparative numerical analysis of its impact on the primary signal processing is carried out, including taking into account the magnetization current transformers. Summarizing, the theoretical and practical studies presented in the article allows formulating requirements for RPs' detailed mathematical models, which will be used in the further research. Streszczenie. W artykule analizoano warunki prawidłowej pracy cyfrowego zabezpieczenia pracy transformatora. W tym celu opracowano model matematyczny układu zabezpieczającego ze szczególnym uwzględnieniem pracy filtru. Przeprowadzono symulacje dla różnych typów zewnętrznego transformatora i filtru dolnoprzepustowego. Analiza wpływu części pomiarowej różnicowego cyfrowego zabezpieczenia transformatora uwzględniająca przetwarzanie sygnału pierwotnego

Settings determination for numerical transformer differential protection via its detailed mathematical model

“…The authors formulated and substantiated an approach to the development of RP detailed mathematical models. The main points of this approach are presented in [21]. Its radical difference from the existing ones is a simulation of processes simultaneously in the whole set of elements in the RP scheme, including CT and PT: instrumental transformers, frequency filters, relays etc.…”

Research into the Effects of Renewable Energy Sources on Relay Protection Operation

“…Обеспечить указанную возможность в совокупности с адекватным симулятором ЭЭС позволяют детализированные математические модели РЗ. Разработкой и исследованием таких моделей, а также применением их для настройки РЗ занимаются авторы [9,10]. Получены положительные результаты для «традиционных» ЭЭС, которые, однако, еще находятся на стадии опубликования.…”