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Dear PRC Thanks a lor for your help!

Thanks a lot. Do you have some documents, recommendation?

In case of ONAN/ONAF we use 0.6..0.7/1 Sonan / Sonaf. What is recommendation for ONAN/ODAF?

Thanks a lot!!!

Dear Colleagues. What is experience with this type of anti-islanding protection? What is regulation/standards in your system. Thanks in advance

Dear Colleagues. What is preferable cooling type of Power Transformer 300/150/150MVA 161/33/33kV? It will be Step-Up transformer. Generation type : PV and BESS. ONAN/ONAF ONAN/ONAF/OFAF ONAN/ONAF/ODAF Thanks a lot in advance!

yes, it is standard solution for years

59N, residual overvoltage protection (broken delta, voltage displacement, etc.) But, it is common detection for whole system. You can use Varmetric, IosinF0 for feeder detection.

Delta on the generator side.

GPR, Touch and Step voltage for 75kA should be crazy!!!

Good explanation of erdep!!! Saiedsadat, take in account, 400V is solid ground. important point: EN 50522:2010 Earthing of power installations exceeding 1 kV a.c.

Do not need make such calculation in the 400V level with TNS system. Earth current is back via PEN. You have calculated on the 20kV side only.

Best way is connect to high speed trip relay, and contact of trip relay to BI of SEPAM...

Add 20ms delay for input operation

Seems as some mistake in wiring or protective terminal configuration. Second option is some dip of DC and unwanted peak up of SEPAM input.

Sverker900, simple and good device

Please see attached document: https://assets.new.siemens.com/siemens/assets/api/uuid:fc71732f-96bc-4fae-96e2-1b5a78df7167/ecodesignleaflet.pdf

Directional earth fault protection is used. Toward to to the generator.

Sorry, not understand. 51GN is direct connection,

Please attach connection scheme.