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Hello All,
I am currently reviewing the protection details of a 2100kW 690V 50Hz generator. In the document handed to me, the following settings for the current and voltage asymmetry were given:
Voltage asymmetry setting: 3.0%
Current Asymmetry setting: ± 350 A
The interpretation is that the allowed voltage asymmetry of 3% is the maximum phase-to-phase voltage deviation from the norminal value. And the current asymmetry is the maximum phase current deviation from the average phase current.
<b>moderator's note:</b> not sure if that is normal value or nominal value.
Now, my question is this: Is there a rule of thumb for estimating a suitable value for the current and voltage asymmetry for protection purpose? I will appreciate your guide.
Thanks
I am currently reviewing the protection details of a 2100kW 690V 50Hz generator. In the document handed to me, the following settings for the current and voltage asymmetry were given:
Voltage asymmetry setting: 3.0%
Current Asymmetry setting: ± 350 A
The interpretation is that the allowed voltage asymmetry of 3% is the maximum phase-to-phase voltage deviation from the norminal value. And the current asymmetry is the maximum phase current deviation from the average phase current.
<b>moderator's note:</b> not sure if that is normal value or nominal value.
Now, my question is this: Is there a rule of thumb for estimating a suitable value for the current and voltage asymmetry for protection purpose? I will appreciate your guide.
Thanks
