REFU Elektronik GmbH REFUsol 08K ... 23K 13
3
Description of Device
3.1
Infastructure Requirements
Additional required equipment
08K – 20K at the low voltage
network
23K at the medium voltage
network
AC load break switch necessary necessary
Central grid protection device
(VDE-AR-N 4105)
only for systems above 30 kVA
required
only for systems above 30 kVA
required
Medium voltage transformer not necessary necessary
The following points are to be considered when planning the infrastructure:
• The 08K – 20K can only feed into the low-voltage grid.
• The 23K can only feed into the medium-voltage grid.
• The 5-wire power supply line must be equipped with an appropriate AC disconnecting device.
• The 23K is not equipped with internal potential isolation.
• If the inverters are connected with the medium-voltage-grid, it must be operated with electrically
isolating transformers.
• No other equipment may be connected between the transformer and inverters.
The following standards and technical regulations are also to be observed:
IEC 60364-4-41
Protection: Protection against electric shock
IEC 60364-4-43
Protection for safety - Protection against overcurrent
IEC 60364-5-52
Selection and erection of electrical equipment - wiring systems
BDEW
Technical Guidelines
VDN
Technical Guidelines
For the 23K an isolating transformer with the following specifications is required:
Specification of medium voltage transformers 23K
Rated power 23 kVA
Rated voltage OS Electricity Utility
Rated voltage US 3 x 460 V PE + N
Frequency 50/60 Hz
Short-circuit voltage u
k
Electricity Utility
Switching group Dyn5 oder Dyn11
Protection Outdoor use IP65 or protected
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