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To Do Development: Circuit Modifications and Tests

1) Modify the AC input circuit to be opto-isolated 2) Remove the rectifier and voltage regulator 3) Embed the UART to USB 4) Use the host PC's USB or USB power supply for DC power source 5) Ev...

Id #11913 | Release: None | Updated: Sun at 10:10 AM by ajstadlin | Created: Nov 12, 2014 at 4:16 AM by ajstadlin

GTosPMU_App - GPS mode with PPS disabled does not work

The GTosPMU application does not work when the PMU Time Source is configured for GPS sync and if the PPS is Not Enabled. Screenshot attached. This is not a typical operational mode, but should fu...

Id #10995 | Release: GTosPMU Application Release 1.0.9.14 | Updated: Sun at 10:10 AM by ajstadlin | Created: May 13, 2013 at 5:09 PM by ajstadlin

Spikes in Phase Chart in GPS Integrated Mode

Attached is a screen shot showing spikes in the Phase Chart line while operating the sensor in GPS Integrated mode.

Id #10122 | Release: None | Updated: Sun at 10:10 AM by ajstadlin | Created: Apr 25, 2012 at 4:50 AM by ajstadlin

Task: Implement IEEE C37.118.2-2011

Work in Progress - Update the GridTrak PMU firmware to comply with IEEE C37.118.2-2011 Standard for Synchrophasor Data Transfer for Power Systems (Dec 28, 2011).   Comments and suggestions welcome!

Id #10069 | Release: None | Updated: Sun at 10:10 AM by ajstadlin | Created: Mar 25, 2012 at 5:26 AM by ajstadlin

Errors: mscorlib: Index was outside the bounds of the array.

Some conditions in the GridTrak software send it out of bounds. The only recovery is to close the program and run it again.   The cause is under investigation. One suspect cause is that the condi...

Id #9992 | Release: GTosPMU Design, Firmware 90A, Software 1.0.9.10 | Updated: Sun at 10:10 AM by ajstadlin | Created: Mar 2, 2012 at 3:29 AM by ajstadlin

Errors in Calculations when Measure at 30 Samples per Second

There are calculation errors in the algorithm when making measurements at rates of 30 samples per second or faster. These appear mostly around the +/- 180 degrees phase angles. There are errors i...

Id #8557 | Release: None | Updated: Feb 14, 2013 at 1:07 AM by ajstadlin | Created: Apr 30, 2011 at 1:32 AM by ajstadlin

To Do: Rate of Change in Frequency

Include Rate of Change in Frequency value to the sensor output data.

Id #8425 | Release: None | Updated: Sun at 10:10 AM by ajstadlin | Created: Apr 9, 2011 at 3:06 PM by ajstadlin

Spikes in Phase Measurement when no probes attached.

Screen Shot Attached. No oscilloscope probes attached to OpAmp inputs during -10 to -5 minutes. Observe the smooth phase angle interrupted by occasional spikes.   One oscilloscope probe attached ...

Id #8423 | Release: GTosPMU Sensor Firmware Ver 5 and App Ver 1.0.0.6 | Updated: Feb 14, 2013 at 1:07 AM by ajstadlin | Created: Apr 9, 2011 at 1:44 AM by ajstadlin

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