Method for distributed waveform recording in a power distribution system

摘要

An exemplary method and apparatus are directed to distributed waveform recording for fault monitoring and analysis of a fault condition in a power distribution system. One or more instrument transformers along with merging units and a plurality of Intelligent Electronic Devices (IEDs) distributed in a plurality of hierarchical levels. The distributed waveform recording corresponds to a fault event at different levels in the power distribution system data is carried out by at least two devices configured to detect an event for recording and perform waveform recording. The data used for waveform recording and the data for detection of the event are based on a single stream of the sampled measured value data and are thereby are time synchronized.

主权项

1. A distributed waveform recording method for event monitoring in a power distribution system, wherein the power distribution system includes a plurality of devices communicatively connected in a plurality of hierarchical levels within the power distribution system, the plurality of devices including a plurality of instrument transformers along with merging units deployed as process level devices connected on a process bus within the plurality of hierarchical levels, a plurality of Intelligent Electronic Devices (IEDs) deployed as bay level devices connected on a station bus and on the process bus within the plurality of hierarchical levels, and a plurality of client computers deployed as station level devices connected on the station bus within the plurality of hierarchical levels, the distributed waveform recording method comprising:
a) communicating, via at least one process level device, sampled measured value data on the process bus; b) subscribing to and processing, via one or more configured IEDs, the sampled measured value data communicated by the at least one process level device to identify an event; c) issuing, via at least one IED from the one or more configured IEDs and based on identification of an event or at least one client computer from the plurality of client computers, a waveform recording trigger to one or more devices among the plurality of devices in the power distribution system using a Generic Object Oriented Substation Event (GOOSE) communication or a Manufacturing Message System (MMS) communication; and d) performing waveform recording, via the one or more devices among the plurality of devices in the power distribution system, wherein the recording of waveforms is performed at different resolutions in different hierarchical levels of the power distribution system by the one or more devices, based on the issued waveform recording trigger, wherein data for identification of an event for waveform recording by the at least one IED and for waveform recording by the one or more devices are derived from the sampled measured value data communicated by the at least one process level device, and sourced from a single stream of the sampled measured value data for time synchronization.