The openPDC is a complete set of applications for processing streaming time-series data in real-time. The name stands for "open source phasor data concentrator" and was originally designed for the concentration and management of real-time streaming synchrophasors. Due to the system's modular design, the openPDC can be classified as a generic event stream processor. History The openPDC is based on the SuperPDC which was developed by the Tennessee Valley Authority starting in 2004. The openPDC officially launched on October 7, 2009. The first stable release of the openPDC was made available on January 28, 2010. Then on February 23, 2010, AREVA T&D announced that they would be providing commercial support for the openPDC. Finally, on April 1, 2010, the Grid Protection Alliance inherited development of the openPDC and entered into a contract with the North American Electric Reliability Corporation in an effort to further enable its use as a distributed system. Operation The phasor data concentrator runs as a Windows service. The service is responsible for managing the life cycle of adapters that create and process the streaming phasor measurements. Adapters are split into three layers: The input adapter layer is typically responsible for receiving data from an outside source such as a phasor measurement unit. That data is used to create measurements which are sent to other adapters to be processed or archived. The action adapter layer is typically responsible for concentration and processing of the input measurements. Adapters in this layer can also introduce new measurements to the system, just like adapters in the input adapter layer. The output adapter layer is typically responsible for archival of measurements received from the input adapter layer and the action adapter layer. These adapters can be configured using any one of three supported database systems: Microsoft SQL Server, MySQL, and Microsoft Access. Features The openPDC implements a number of standard phasor protocols which can be used to receive data from devices. The supported protocols are IEEE C37.118 (v1.0 and Draft 6), IEEE 1344, BPA PDCstream, FNET, SEL Fast Message, and Macrodyne. There is also a built-in concentration engine which sorts the real-time data into frames based on the timestamp associated with each measurement. The sorted measurements can then be streamed to other applications using either IEEE C37.118 or BPA PDCstream. The system is capable of concentrating over one billion measurements per day coming from over 100 phasor measurement units across the