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7.1.3 Adjust Voltage Ratio via Tap Changer
Tap changer can adjust transformer output voltage. When operating tap changer, ensure
that transformer is in the no-excitation state, that is, the high and low voltage sides of
transformer are not live. When voltage of the low-voltage side remains unchanged, the
output voltage on high-voltage side at different taps are:
Tap position Value
1 Nominal Value x 1.05
2 Nominal Value x 1.025
3 Nominal Value x 1.0
4 Nominal Value x 0.975
5 Nominal Value x 0.95
Take tap position 1 as an example, the steps to adjust the voltage ratio is shown in the
following figure.
figure 7-1 Adjust the voltage ratio via the tap changer
7.1.4 Opening Pressure Relief Valve
Open the cap on the pressure relief valve (marked as A below).
7.1.5 Removing Foam Part from Oil Thermometer
Remove the protective cover on the oil thermometer and remove the foam parts in the
protective cover before the inverter is officially put into operation.
System Manual 7 Power On the MV Station
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