User Manual 6 Electrical Connection
31
Scenario 2:
Several inverters are operated in parallel connection to low-voltage side of MV
transformer. The high-voltage side of MV transformer is connected to the Middle
Voltage Grid.
Requirements:
If the number of the grid-connected inverters exceed 40, please contact
Sungrow.
The rate voltage on the low-voltage side of transformer must meet the inverter
output electrical specification. A neutral point is necessary and must lead
outwards as neutral conductor.
Transformer with a short-circuit impedance less than 6% is recommended.
6.2.2 Grid Connection
An AC terminal block inside the connection cabinet is used for the five-wire grid
connection (L1, L2, L3, N, PE) of the inverter. And feed-in power is always
three-phase via the AC terminal.
AC Cable Requirements
Consider the following facts when select AC cables specifications and types:
The grid impedance of the AC cable must correspond to the specification to
avoid unintended disconnection from the grid or derating of the output power.
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