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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.

OK. next steps. 1. What is a setting ground fault and overcurrent of upstream breaker? 2. What is a data of 13.8/0.48kV transformer? ( setting of 20A, 1sec and 30A 0.5 sec....is not setting)

Without short circuit study....not possible determinate setting. What is a setting for overcurrent?

Hello that means, single phase short circuit current. In your case, system is solid grounded, its very high level of single phase short circuit current. Some one make short circuit study of system? Im not familiar with Vamp terminals. What is 0.67A ? Why 0.3PU is 30A? CT is 50/1 Phase CT is...

What is a type of neutral grounding of the system? solid, low impedance, high impedance, compensated? What is a phase to neutral fault current?

It is some old information about MPTTR function, for REF615. Hope it is help https://www.dropbox.com/s/h6h9ksea4for386/MPTTR.rar?dl=0

We are always ground shield of any control cable ( include CT, VT) on the both side.