I recently saw this photo of the project "NATO-L", or North Atlantic Transmission One-Link. It's an under-sea powerline planned to connect Europe with North America.

Does anyone know what frequency such cables run at? I was thinking it looks like a giant coax cable, and so it must have characteristic impedance and other related parameters. I seem to recall the big over-land powerlines run at 400Hz. I searched google about this cable, but I could not find any information about the frequency.

I recently saw this photo of the project "NATO-L", or North Atlantic Transmission One-Link. It's an under-sea powerline planned to connect Europe with North America.

Does anyone know what frequency such cables run at? I was thinking it looks like a giant coax cable, and so it must have characteristic impedance and other related parameters. I seem to recall the big over-land powerlines run at 400Hz. I searched google about this cable, but I could not find any information about the frequency.

EDIT: Thank you for the answers about the DC and 400hz. It seems I was incorrect. I do recall seeing something related to powerlines many years ago, and there was definitely something about 400hz, since I've had that number stuck in my head since then. But it seems I misunderstood.

I recently saw this photo of the project "NATO-L", or North Atlantic Transmission One-Link. It's an under-sea powerline planned to connect Europe with North America.

Does anyone know what frequency such cables run at? I was thinking it looks like a giant coax cable, and so it must have characteristic impedance and other related parameters. I seem to recall the big over-land powerlines run at 400hz. But I searched google about this cable, and I could not find information about the frequency.

I recently saw this photo of the project "NATO-L", or North Atlantic Transmission One-Link. It's an under-sea powerline planned to connect Europe with North America.

Does anyone know what frequency such cables run at? I was thinking it looks like a giant coax cable, and so it must have characteristic impedance and other related parameters. I seem to recall the big over-land powerlines run at 400Hz. I searched google about this cable, but I could not find any information about the frequency.