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Grid Frequency Limits


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On 2023/05/20 at 8:48 PM, grant.cpt said:

Anyone know what the Upper and Lower limits are of the Grid Frequency?

Baseline: 50Hz
 

Looking at setting up alerts in what my inverter measures

As spesified by:NRS 048-2:2004
Edition 2.1

Grid ± 2,5% (± 1,25 Hz) lower limit = 48,75hz upper limit = 51,25hz
 

 

Edited by TaliaB
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16 hours ago, Chris.P.Bacon said:

How accurate are the Axpert inverters at reading the frequency?

I'd also like to set an alert for mine, I've noticed incredible fluctuations the past 60 days.

Can you post a graph of the frequency measured over say a day. 

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16 minutes ago, Scorp007 said:

Can you post a graph of the frequency measured over say a day. 

@Scorp007 here is the frequency in my area for the last 12 hours. Lowest at 49.6 H but I've seen it slightly lower.

And for interest sake here is the grid voltage as well.

image.thumb.png.0980f465d0a67804be4f9e5354caa0f1.pngimage.thumb.png.3410d6d58580e0fb81177ad7afb6c533.png

Edited by Antonio de Sa
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57 minutes ago, Antonio de Sa said:

@Scorp007 here is the frequency in my area for the last 12 hours. Lowest at 49.6 H but I've seen it slightly lower.

And for interest sake here is the grid voltage as well.

image.thumb.png.0980f465d0a67804be4f9e5354caa0f1.pngimage.thumb.png.3410d6d58580e0fb81177ad7afb6c533.png

So all together no problem at all. 

Thanks for the pics. 

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On 2023/05/22 at 7:32 AM, Chris.P.Bacon said:

How accurate are the Axpert inverters at reading the frequency?

I would think very good. The DSP is of course running off a crystal, and there is capture hardware used, and an interrupt dedicated to zero crossing of the AC input. Frequency measurement is simple with that setup. 

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