Modeling a transformer differential protection relay in the RTDS

Author(s)

Fabiano Gustavo Silveira Magrin

• Document type: Master's Dissertation
• Press: Campinas, SP.
• Institution: Universidade Estadual de Campinas (UNICAMP). Faculdade de Engenharia Elétrica e de Computação
• Defense date: 2014-04-23

Examining board members

Maria Cristina Dias Tavares; Athula Dayanarth Rajapakse; Luiz Carlos Pereira da Silva

• Advisor: Maria Cristina Dias Tavares

Abstract

Due to the difficulties involving tests in real systems engineers continuously look for tools and models to simulate or emulate real systems inside laboratories. With this focus, this job had the objective of developing a transformer differential protection relay in Real Time Digital Simulator, RTDS, based on SEL-787 relay, manufactured by Schweitzer Engineering Laboratories Inc. The objective of creating a specific relay already in the market, and not a generic model relay, is due to the necessity of the laboratories studies give real results and also represent the real system. This actual representation gives the engineers a more concrete data to support future expansions of the national and international electric systems. After the development of the relay model itself, it was tested in conjunction with a real SEL-787 allowing comparison of the results. For the accomplishment of this job many different situations which interfere in the daily operation of the relay in the field such as inrush, saturation, external faults, external faults with current transformer saturation, internal fault to the differential section but external to the transformer and internal faults like turn-to-turn faults and ground faults were studied and analyzed. The same tests were applied to a differential relay model already in the RTDS library with the purpose to verify whether generic models have different results compared to specific models. This research formerly presents a transformer differential relay model of a commercial relay for RTDS library (AU)

• FAPESP's process: 13/06162-2 - Development of a SEL differential protection relay into the RTDS
• Grantee: Fabiano Gustavo Silveira Magrin
• Support Opportunities: Scholarships in Brazil - Master