IEC 61850 Based Bus Protection Applications Dr. Alexander Apostolov Dr. Alexander Apostolov St. Petersburg, Russia, 2011 Introduction • IEC 61850 standard has a significant impact on the development of a new generation protection solutions • The paper analyzes conventional centralized and distributed bus differential protection schemes and compares them with IEC 61850 station and process bus based solutions. Page 2 Introduction • It describes their principles and discusses the benefits of the new bus protection schemes – improved flexibility, performance, safety and reduced cost. Page 3 Questions ? Page 4 Questions • What do we need to do to protect a bus? • What is the typical way of protecting a bus? • What are the problems? • How does IEC 61850 help us protect a bus? Page 5 Bus Differential Protection © OMICRON Page 6 Conventional Bus Differential © OMICRON Page 7 Conventional Bus Differential © OMICRON Page 8 Multiple Inputs © OMICRON Page 9 Distributed Differential Protection © OMICRON Page 10