Innovative modular phasor measurement unit

December 3rd, 2014, Published in Articles: Energize


Microsoft Word - p216_Axion PMU_rev3.docxSchweitzer Engineering Laboratories has released its new phasor measurement unit (PMU) implemented in the modular SEL-2240 Axion, making it easy to create a customised solution for a specific synchrophasor application. Designed for extreme environments, the Axion is a flexible, secure platform that allows the user to install the number and type of modules to achieve the functionality they require. For PMU applications, the SEL-2245-4 AC analog input module measures frequency as well as voltage and current phasors, and the SEL-2244-2 digital input module communicates breaker and switch status using digital status bits in synchrophasor messages. The modular PMU supports the latest version of the synchrophasor standard, IEEE C37.118-2011 (as amended by IEEE C37.118.1a-2014), for both P and M class measurements. Each analog input module provides four meter-class CT inputs and four PT inputs, and each digital input module provides 24 digital inputs. The modularity of the device allows a user to configure a PMU with up to 64 phasors and 30 digital inputs, making it ideal for any size of substation.

Contact Rudolf van Heerden, Schweitzer Engineering Laboratories,

Tel 012 664-5930,


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