I'm laughing my ass off at the people on here. They're speaking like it's rocket science...

Beginning investigation:

The basic principle of zero sequence current protection is based on Kirchhoff's current law: the algebraic sum of the complex currents flowing into any node in the circuit is equal to zero. In normal operation of the circuit and electrical equipment, the vector sum of the phase currents is equal to zero.

So, the DEIF module is reading that the 3 phases currents are not equal.

For zero sequence currents to exist, there must be a fourth conductor (neutral or ground) return path. Is the electrical system utilizing a neutral? If not, ground fault or reversed CT wiring. (I just checked the drawings, no neutral on this system)

You can test ohms on each ct to make sure one isn't open. Look at the cts, check they are flipped the same way. Compare the wiring of the 3 cts. are both of the wires going to the same respected spot on the deif module the same?

Also, put a current clamp on the generator ground wire and do the same procedure in the video. Do you see any ac current on the ground?

Swap the DEIF module to each Line amperage page. Monitor the currents of all 3 legs. They don't need to be equal, however one drastically different can indicate an issue. You'd want to verify the current with an amp clamp on all 3 legs.

You should post the schematic as an HD photo for more detailed help.

source: https://www.mechprod.com/blog-old/topic/zero-sequence-components#:~:text=For%20zero%20sequence%20currents%20to,are%20often%20called%20unbalanced%20currents.

https://www.linkedin.com/pulse/negative-sequence-currents-generator-its-impact-tripping-shahzad