The Sampled Measured Value (SMV or SV) Process Bus concept that was introduced by the IEC 61850-9-2 standard. This standard proposes that the Current and Voltage Transformer (CT, PT) outputs and other signals are digitized at the source and then communicated to those devices using an Ethernet-Based Local Area Network (LAN).

The Sampled Values are transmitted as high speed streams of data set samples encoded in multicast Ethernet frames.  The protocol uses a publisher/subscriber model, in which a publisher transmits unacknowledged data to subscribers. As an example, in IEC 61850-9-2 LE profile, the Sampled Values are published at a rate of 4000 frames per second for a grid frequency of 50Hz and 4800 frames per second for 60 Hz.

Electrical substation

The new digital substations use SMVs to control, protect and automate the grid. This means that advanced computation capabilities are required to process multiple SMV streams with the minimum latency and with determinism to ensure the real-time operation required. The typical SMV post-processed information required by the control and protection applications is: the module and angle of the 1st harmonic,  the RMS value and the SMV decimated to the data-rate able to be processed but the software.

SoC-e SMV Technology

SoC-e has developed a innovative technology to process massively SMV streams with a deterministic and very low latency taking benefit from parallel hardware processing. For more information, please check SMVsubscriber IP Core Web Page.