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
Id #11913 | Release:
| Updated: Nov 12, 2014 at 3:16 AM by ajstadlin | Created: Nov 12, 2014 at 3:16 AM by ajstadlin
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 22.214.171.124
| Updated: May 13, 2013 at 4:09 PM by ajstadlin | Created: May 13, 2013 at 4:09 PM by ajstadlin
Attached is a screen shot showing spikes in the Phase Chart line while operating the sensor in GPS Integrated mode.
Id #10122 | Release:
| Updated: Feb 14, 2013 at 12:07 AM by ajstadlin | Created: Apr 25, 2012 at 3:50 AM by ajstadlin
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:
| Updated: Feb 14, 2013 at 12:07 AM by ajstadlin | Created: Mar 25, 2012 at 4:26 AM by ajstadlin
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 126.96.36.199
| Updated: Apr 17, 2013 at 9:46 PM by ajstadlin | Created: Mar 2, 2012 at 2:29 AM by ajstadlin
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:
| Updated: Feb 14, 2013 at 12:07 AM by ajstadlin | Created: Apr 30, 2011 at 12:32 AM by ajstadlin
Include Rate of Change in Frequency value to the sensor output data.
Id #8425 | Release:
| Updated: Feb 14, 2013 at 12:07 AM by ajstadlin | Created: Apr 9, 2011 at 2:06 PM by ajstadlin
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 188.8.131.52
| Updated: Feb 14, 2013 at 12:07 AM by ajstadlin | Created: Apr 9, 2011 at 12:44 AM by ajstadlin