All-in-one Devices: DFR SER DDR PMU PQ TW

The Digital Fault Recording function creates a transient oscillograhic record, extended oscillograhic record, and extended RMS record. Transient recording rates can be user programmed up to 24,000Hz. Voltages, currents, and events are recorded before, during, and after the fault. Timers are user programmable. Each data sample is time stamped for convenient protection analysis, circuit breaker operation, clearance times, and waveform overlaying. Transient records can be started with many user programmable analog or digital triggers. Extended Oscillography and Extended RMS fault records can be created each time a transient record is recorded. Extended recording rates are user programmable up to 1200Hz and up to a maximum record length of 40 minutes. All records are automatically created in COMTRADE format. All records can be viewed locally or automatically/manually retrieved with our APP ClearView analysis software.

The Sequence of Events function allows the user to select any digital channel and assign it as a DFR point, SER point, or both. When a digital point is assigned to the SER function it will be logged to a daily report each time it changes state (normal to abnormal and vice-versa.)  Each recorded SER entry includes a time stamp, digital channel name, digital channel number, normally open or normally closed state, if it is normal or abnormal, and clock synch status. 

The DDR function encompasses Continuous RMS, Frequency, Phase, Oscillographic, Trend, and One Cycle Shot recording. RMS, Frequency, and Phase can be recorded in a circular buffer down to 1 point per cycle for up to 99 days. Oscillographic data can be continuously recorded at a sampling rate of up to 1200Hz for a period up to 99 days (dependent on channel count and memory size). For any of these continuous recording functions, the user can retrieve or locally save any time slice over the recorded period. All channels or specific channels can be retrieved or saved.

The PMU function satisfies the IEEE standard on synchrophasors (C37.118) for providing phasor information. A user can stream more than 11 line groups while performing all the other recording functions. The user has the choice to stream all line phasor information, frequency, positive sequence voltage, and positive sequence current or just positive sequence voltage and current. User programmable data transfer rates and protocols are a standard feature. Functionality for the local long term storage of PMU data is available.

Trends for continuous RMS, Frequency, and Phase are recorded for up to 99 days. Trend plots include maximum, average, and minimum for each analog channel. Trends for all channels or specific channels can be retrieved.

For steady state power quality purposes, the recorder can capture a one cycle snap shot every minute at the transient recording rate and store the data in a circular buffer for up to 99 days. The system's ability to automatically convert the recorded data in COMTRADE or PQDIFF format is  useful for viewing it with both APP or third-party power quality software such EPRI PQView (Electrotek Concepts™ and EPRI™). With APP ClearView, a user is provided the tools to review and analyze DFT, FFT, Vector, Power, and Impedance information. 

Traveling Wave Fault Location is a method to determine the location of a fault on an electrical transmission line. Highly accurate over long distance, for all types of faults  quickly located and displayed to direct maintenance teams and reduce downtime. Highly configurable, with double and single ended solutions.