Abstract: A uniquely configured electrical power transmission data recorder system generates a first data stream. The first data stream is a digitized form of an electric power signal being monitored. The data recorder calculates a second data stream from the first data stream. The second data stream is a phasor representation of the electrical power signal being monitored. Vectors of the second data stream are provided at a lower frequency than vectors of the first data stream. The data recorder system associates different fault triggers with each of the data streams. When the data recorder detects a condition that activates one or more of the fault triggers, it generates a power fault record. The power fault record has a prefault portion corresponding to a time period before a fault is detected and a postfault portion corresponding to a time period after the fault ceases. The system may include a number of different processors dedicated to different power monitoring and data recording tasks.