REFU Elektronik GmbH
REFUsol 40K / 46K-MV
15
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The 40K can feed into the low-voltage grid and the medium-voltage grid.
•
The 46K-MV can only feed into the medium-voltage grid.
•
The 5-wire power supply line must be equipped with an appropriate AC disconnecting device.
•
The 40K/46K-MV is not equipped with internal potential isolation.
•
If the 40K/46K-MV is 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 REFUsol 40K / 46K-MV an isolating transformer with the following specifications is required:
Specification of medium voltage transformers 40K
46K-MV
Rated power
40 kVA
46 kVA
Rated voltage OS
Depends on grid connection point
Rated voltage US
3 x 400 V PE + N
3 x 460 V PE + N
Frequency
50/60 Hz
50/60 Hz
Short-circuit voltage u
k
Depends on grid connection point
Switching group
Dyn5 or Dyn11
Dyn5 or Dyn11
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3.3
Features of REFUsol 40K / 46K-MV
The REFUsol 40K / 46K-MV inverter is a transformer-less, three-phase solar inverter, which has a
particularly high efficiency at any operating point.
Heat is dissipated only by convection. The internal temperature control prevents the device from exceeding
the permissible ambient temperature.
The inverter is designed such that the device does not have to be opened for assembly and connection work.
The inverter provides communication interfaces for RS485 and Ethernet. The communication protocol is
Modbus and Sunspec compliant.
An illuminated graphical display shows the development of the feed-in power and other operating data in a
clearly arranged manner. An 8-key control panel below the display also provides excellent control and
navigation convenience. Based on its design in protection class IP 65, the inverter can be installed at almost
any outside location. The inverter has extensive safety and security features. For details, refer to Technical
Data.
