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Of course, the facility is connected at 10 kV. The ROCOF function should only be turned on the incoming relay which already has this function available. I think it's a way of future proofing the plant. But it might be that the over/under frequency stage is enough in it self.

Hello, I'm working on a project regarding relay settings for an industrial plant, <10 MW. They are able to supply the plant fully through their syn. generator or through their connection to the grid, or a combination of both. It's been decided that they want ROCOF protection on their incomer...

@wcaseyharman unfortunately this is not the case here, but the document @7anoter4 linked does say it is better to consult with the cable manufacturer on this matter, which I will give a go. Thanks for your answers. Though if they give me the Z0-value of the cable, won't this value only apply to...

I'm trying to calculate the zero sequence impedance of a cable for the calculation of single phase to ground fault and could use some clarification. The cable in question is 3x300/25mm² NA2XS2Y 6/10(12)kV, which there will be installed two of in parallel along with a 35mm² PE conductor. Is...