Adjusting The Transmission Ratio Of The Mv Transformer; Checking The Voltages Of The Mv Transformer; Checking And Connecting The Supply Voltage; Checking The Output Voltage Of The Inverter - SMA MEDIUM VOLTAGE POWER STATION 500SC-JP System Manual

SMA Solar Technology AG
Procedure
Mount the protective covers.
Mount the panels.
Switch on the supply voltage and the AC disconnection unit.
6.4.2

Adjusting the Transmission Ratio of the MV Transformer

Requirement:
☐ No voltage must be present at the MV transformer.
Procedure:
• Use the tap changer on the MV transformer to set the nominal voltage of the medium-voltage side. Set the
voltages of the MV transformer during configuration.
6.4.3

Checking the Voltages of the MV Transformer

Requirement:
☐ The MV transformer must be connected (see Section 7.8, page 102).
Procedure:
• Measure the voltage at the low-voltage side and record it in the commissioning report. Set the voltages of the MV
transformer during configuration.
6.4.4

Checking and Connecting the Supply Voltage

1. Ensure that the voltage on the primary side is within the permissible voltage range of the transformer for internal
power supply.
2. Switch on the transformer circuit breaker of the transformer for internal power supply.
3. Check whether the supply voltage is within the permissible voltage range of the inverter.
If the supply voltage deviates from the permissible voltage range of the inverter, adjust the transmission ratio of the
transformer for internal power supply.
6.4.5

Checking the Output Voltage of the Inverter

1. Use a rotating field instrument to measure whether a right-hand rotating magnetic field is connected at the AC
connection brackets.
If a left-hand rotating magnetic field is detected, two line conductors must have been wrongly connected.
• Swap the connections L1 and L3.
2. Check whether the AC voltage is approximately the same as the nominal voltage of the inverter. Measure the AC
voltage between the terminals at the AC connection brackets and record in the commissioning report.
If the AC voltage differs significantly from the nominal voltage of the inverter, the transformation ratio of the MV
transformer must be adjusted by a duly authorized person.
System Manual
6 Commissioning
See
Section 12.3.1.1, page 163
Section 12.3.1.2, page 164
Section 6.4.7, page 78
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