Abstract: An intelligent electronic device (IED) integrating a power metering unit (PMU) and a merging unit that combines signals from both analog transformers and digital transformers into a set of merged digital samples. Analog current/voltage signals from analog CTs/PTs are received at the IED's analog inputs and converted to digitized samples. Digital current/voltage samples from digital CTs/PTs are received via point-to-point connections at digital inputs of the IED. A tagging unit applies metadata tags to the digitized and digital samples. The metadata tags include the transformer providing the input signal, sampling rate, primary and/or secondary timestamps, scaling values, calibration values, and/or the location of the IED in the electrical system. The PMU performs metering and/or power quality calculations on the samples, and the calculation results are formatted and transmitted via a master-slave protocol to a requesting master.

Abstract: A method of performing a sequence-of-events analysis in a power monitoring system includes the acts of monitoring, receiving, analyzing, and storing. The act of monitoring includes monitoring messages published by multiple power monitors over a peer-to-peer communications network. The messages include electrical power monitoring parameters. The act of receiving includes receiving the published messages in a subscriber intelligent electronic device in the power monitoring system. The act of analyzing includes analyzing at least a portion of the received messages, performing statistical analysis and/or continuously scanning for an event of interest. The act of storing includes storing at least one record including at least one of statistical data or event of interest data.

Abstract: A method and system of efficiently distributing configuration information for IEDs across one or more networks in an electrical monitoring system is disclosed. Changing configuration information is managed by a configuration management system. The IEDs in the network or networks are organized in peer relationships, each peer relationship having at least one seed IED. The configuration information is loaded to the seed IED or seed IEDs which make the configuration parameter available to other IEDs in a peer relationship with the seed IED. The other IEDs may in turn become seed IEDs for other IEDs. The configuration information therefore cascades throughout the network without further communication between the configuration management system and the selected IEDs.

Abstract: An intelligent electronic device (IED) integrating a power metering unit (PMU) and a merging unit that combines signals from both analog transformers and digital transformers into a set of merged digital samples. Analog current/voltage signals from analog CTs/PTs are received at the IED's analog inputs and converted to digitized samples. Digital current/voltage samples from digital CTs/PTs are received via point-to-point connections at digital inputs of the IED. A tagging unit applies metadata tags to the digitized and digital samples. The metadata tags include the transformer providing the input signal, sampling rate, primary and/or secondary timestamps, scaling values, calibration values, and/or the location of the IED in the electrical system. The PMU performs metering and/or power quality calculations on the samples, and the calculation results are formatted and transmitted via a master-slave protocol to a requesting master.

Abstract: A method of performing a sequence-of-events analysis in a power monitoring system includes the acts of monitoring, receiving, analyzing, and storing. The act of monitoring includes monitoring messages published by multiple power monitors over a peer-to-peer communications network. The messages include electrical power monitoring parameters. The act of receiving includes receiving the published messages in a subscriber intelligent electronic device in the power monitoring system. The act of analyzing includes analyzing at least a portion of the received messages, performing statistical analysis and/or continuously scanning for an event of interest. The act of storing includes storing at least one record including at least one of statistical data or event of interest data.