IEEE 802.24 Vertical Applications TAG Project IEEE 802.24 Vertical Applications Technical Advisory Group IEEE 802.1 Time Sensitive Networking Task Group IEEE 802.3br past TG on Interspersing express traffic (IET) Utility Applications of Time Sensitive Networking White Paper Date Submitted 10-July-2017 Source 802.1 802.24 Ruben Salazar, Tim Godfrey, Ludwig Winkel, Norm Finn, Clint Powell, Ben Rolfe Re: White Paper Development Abstract TSN White Paper Purpose TSN White Paper Notice This document has been prepared to assist the IEEE P802.24. It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein. Release The contributor acknowledges and accepts that this contribution becomes the property of IEEE and may be made publicly available by P802.24. Describe why TSN is needed in a utility In the context of this white paper, the utility is considered the entity (or entities) that manage the distribution of electricity from the transmission grid, to the distribution grid, to the customers. The power distribution network involves
substations, and various protective and control devices that communicate over communications networks. Typical utility terminology is a “low latency network” Define what “realtime” means in the context of specific grid use cases and applications. Real-time behavior of Ethernet based communication networks is defined in IEC 61784-2. There are 6 (plus one technology specific) consistent sets of parameters described to define the requested and achieved Real-time Ethernet behavior of end-to-end stations. For the network components using TSN is an effort ongoing in IEC SC 65C.PT61784-6, dealing with a TSN profile for industrial automation applications. Teleprotection – differential protection schemes require very low (<10ms) end to end latency, which must be highly consistent and predictable. Teleprotection – differential protection schemes require very low (<10mS) end to end latency, which must be highly consistent and predictable. Type of connection – typically fiber Intra-substation LAN. Support for IEC 61850 Generic Object Oriented Substation Event (GOOSE) messages for controlling relays and switches within the substation. TR61850-90-13 addresses this Type of connection – typically Ethernet (copper or fiber) GOOSE and MMS traffic. TSN could be a help on the process bus - Shared IT/OT networks over a common medium. The OT networks require a controlled, predictable latency, and freedom from dropped or lost packets. This behavior is required regardless of the loading or overloading of the IT network. How does TSN affect this? The important benefit is providing a converged architecture. Critical services can have guaranteed performance and bounded latency. This saves cost by converging several networks into one. But not all TSN behaviors can be built in one network component without a difficult engineering. A profile for Utilities is needed to reduce the effort of engineering. IEC TC57 is looking for such a profile and is collaborating with the IEC SC65C/MT9.PT61784-6 project team.