Hi there,
We are beginning to work with a customer to develop frameworks around the early warning diagnosis of feeder faults. This will center around monitoring of high-speed rolling voltages, currents and harmonics.
It is clear to me that the 4-30 parameters which update 150/180 cycles could be best to use. Therefore theHarmonics Measurement and Power Quality Aggregator modules will get us started.
1. How do each of the four aggregation methods work in the Harmonics Measurement module?
2. What does Tvs stand for?
3. Is the 4-30 standards aggregation method an 'average'?
3. Which setting will give a 150/180 rolling average?
4. Which setting will give a 10 minute rolling average?
Kind regards
Richard
1. How do each of the four aggregation methods work in the Harmonics Measurement module?
2. What does Tvs stand for?
Tvs stands for "time very-short". It is a legacy term for 150/180 cycle (3s) interval predating IEC61000-4-30.
3. Is the 4-30 standards aggregation method an 'average'?
The 4-30 time aggregation of magnitudes is always an RMS (root-mean-square). For a constant signal, the result is the same as average. I believe RMS was chosen because it is proportional to thermal effects from fluctuating harmonics (where an average would under register the severity)
3. Which setting will give a 150/180 rolling average?
The "4-30 150/180 Cycle" method provides a non-overlapping rms approximately every 3 seconds.
4. Which setting will give a 10 minute rolling average?
The "4-30 10minute" method provides a non-overlapping rms every 10 minutes.
Thanks Dan,
Perfect answers!
We should get this detail added to the ION Reference manual...
Eric Tjiptadjaja, Arneil Dalope, Leah Sun
Cheers Richard
Hi Richard, I assume your application is for feeder cables where you could have insulation failure that develops over some time, allowing possible detection by monitoring the parameters for small changes?
thanks
Graham
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