Here in the US we have a saying "RTFM" read eleswhere for translation.
You need a VT connected to the 6.6kV (6600:110). Follow the instructions on pg 27 of the manual CAREFULLY.
It appears that the scaling will be in secondary values only. I would recommend some kind of spreadsheet be made to calculate equivalent HV values. Print out the spreadsheet and keep near the meter for future reference.
From the Manual:
6.3 High Voltage use of NR6/NR12
This controller is primarily intended for LV network, but may be used in HV networks under
the commissioner’s full responsibility, if the following points are taken into account.
Connections must employ VT and CT with respect to the following figure.
In HV applications the power values displayed in Measurement Menu represent only the secondary
side values of the VT. To avoid potential misunderstandings, set the CT ratio to percentage
scale.
Safety (or reconnection) delay must be adapted to the value of the discharge resistors of the
capacitors, the most usual value is 10 minutes (600 seconds). The controller’s default response
delay is adapted for LV use. Using too short a response delay may damage the capacitors.
Important:
• the whole commissioning process must be performed using the Manual setup menu and
Parameter menu
• the commissioner should not use Bank Pre-Configuration and Commissioning menus