the switch is located on the Trafoseite behind the HV fuse-links.

Have a quick release with you all Trafoschalter?

So I until now still no plant built without Aüslösung by the backup, regardless of whether EnBW, RWE, Eon, or anybody.
But I have never used these short closing in one of our facilities.
In any facility still seen only normal earthing switch,.

If these short closing is activated in case of overload, but the backup still does not fire, then they throw at the latest. And if then the trigger does not work or is jammed, then good night.

From a capacity of 1200 kVA installed it Yes, circuit breakers, which are to avoid an overload.
Can you ask at what operators you work or where you are?
The earthing switch the 3 phases are grounded and necessarily at the same time shorted.
This is the capacitive permanent after a shutdown and / or induced voltage to Earth derived from adjacent cables and short-circuited with each other.
The same is achieved by grounding cables.
This has nothing with HV fuse-links, to do transformer protection or similar. It prevents the formation of stress of disconnected systems / cells (capacitive and / or inductive) and protects against accidental switching on the workers working there.
1970s Cologne-Kalk, restarting a 110kV cell when grounding switch is closed... within 1 km radius heal almost any disc.