ADE9000 HPF frequency with rogowski coil

A rogowski coil has a high bandwidth as well as it's a very linear sensor when compared to something line a current transformer. This means that the 1/f noise could cause errors in the measurement. The reason that this is not a set recommended corner is because there is always a tradeoff. In this case the tradeoff is one of noise versus gain variation over frequency. For noise purposes you would want the corner to be higher but to minimize the gain variation of the 40-70 Hz range, you would want the corner to be lower.

That is why this is listed as a choice based on your specific design requirements. For this reason, you would need to choose the corner frequency that works best for your particular requirements. I would recommend staying with the default corner and seeing if all you accuracy requirements, only modifying the corner if there is an issue.