IEC 61850 SAS with station bus (around 2005): The IEC 61850 family of substation communication systems standards were released in the early 2000s. These standards promoted Ethernet based bay level (between bay and station level) and process-level (between switchyards and control rooms) connections using common protocols. The IEC 61850 based SAS started implementing station bus according to IEC 61850 standard. IEC 61850 SAS with station and process bus (around 2015): The IEC 61850 based SAS implements process and station bus according to IEC 61850 standard     -Ankit Acharya Healthcare Segment KAM ... View more

Typical features of IEC 61850 are listed below: Interoperability: Different vendors are allowed to provide complete integration of monitoring, protection and control functions within one or two IEDs. Free Configuration: Any possible number of substation protection and control functions can be integrated at bay level IED. Simple Architecture: As the plenty of point-to-point copper wires are reduced to just simple Ethernet based communication links. Further, functional hierarchy architecture provides better communication performance for time critical applications. Overall Cost Saving: The high-speed digital communication at process level allows replacing the traditional copper wiring using communication link, which could save a lot of effort and cost for substation automation system.   - Ankit Acharya Healthcare Segment KAM ... View more

All the IEDs were configured as per their intended run time functionality. For example, real IED1 receives binary inputs from the external world. Upon receiving the binary input, IED1 triggers GOOSE message to another real IED2. It also sends the same message to simulated IED as well. With fully functional setup, the tools captured the bandwidth utilization and transfer time for one of the messages on network. Hence, the bandwidth utilization and message transfer time is within limits and satisfactory.   -Ankit Acharya Healthcare Segment KAM ... View more

IEC 61850 defines an abstract object model for substations and methods to access these objects on a network. The abstract object model represents the SAS functionality in terms of logical nodes (LN) within the logical devices that are allocated to the IEDs as the physical devices. The actual communication between IEDs is handled via common IEC 61850 protocols such as SV, MMS and GOOSE.   -Ankit Acharya Healthcare Segment KAM ... View more

Standard is getting updated for the solidly earth system for SC test duties. It is defining the additional test requirement for solidly earth system during 100% rating of symmetrical earth fault ( TD100S) and asymmetrical earth fault (TD100a). Implications of this to on our product is to make sure that our interrupting system is withstanding the electrical stresses developed during this specific case. Most of the our end customers ( Healthcare, Home/Buildings) will have the solidly / resistance grounded systems. This will mandate us to validate our product as per the new standard.   - Ankit Acharya Healthcare Segment KAM ... View more

The process level is separated from bay level by a process interface called process bus. Process IEDs are connected to bay IEDs via process bus. Process bus is typically an optical link, replacing the hardwired process interface that conventionally links the primary equipment from switchyard to bay level. The station level of SAS includes Operator Work Station with Human Machine. Interface and a gateway to Network Control Center. Network Control Center hosts central Energy Management System (EMS) and/or Supervisory Control and Data Acquisition (SCADA) systems to regulate power generation and distribution to consumers.   -Ankit Acharya Healthcare Segment KAM ... View more

If we follow 61439-3, we will adhere to complete system level testing. which is more closer to real time use case. There is a possibility that, products are good individually but when put in system, they behave differently and may not meet all the essential safety needs. IEC 61439-3 ensures the testing is done at system level.   -Ankit Acharya Healthcare Segment KAM ... View more