Standards
The IEEE 1344 standard for synchrophasors was completed in 1995, and reaffirmed in 2001. In 2005, it was replaced by IEEE C37.118-2005, which was a complete revision and dealt with issues concerning use of PMUs in electric power systems. The specification describes standards for measurement, the method of quantifying the measurements, testing & certification requirements for verifying accuracy, and data transmission format and protocol for real-time data communication. This standard was not comprehensive- it did not attempt to address all factors that PMUs can detect in power system dynamic activity. A new version of the standard was released in December 2011, which split the IEEE C37.118-2005 standard into two parts: C37.118-1 dealing with the phasor estimation & C37.118-2 the communications protocol. It also introduced two classifications of PMU, M - measurement & P - protection. M class is close in performance requirements to that in the original 2005 standard, primarily for steady state measurement. P class has relaxed some performance requirements and is intended to capture dynamic system behaviour.
Other standards used with PMU interfacing:
- OPC-DA / OPC-HDA - A Microsoft Windows based interface protocol that is currently being generalized to use XML and run on non Windows computers.
- IEC 61850 a standard for electrical substation automation
- BPA PDCStream - a variant of IEEE 1344 used by the Bonneville Power Administration (BPA) PDCs and user interface software.
Read more about this topic: Phasor Measurement Unit
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