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System Manual
Step 4 Open the drain valve and the oil in the transformer slowly flows from the transformer into the
tank.
Step 5 Check the position of the oil level gauge according to the temperature-level curve according
to the local ambient temperature. Stop draining when the oil in the transformer is reduced to
the required level.
Step 6 Close the drain valve and remove the drain hose connector and the hose.
Step 7 Re-install the cover plate of the drain valve.
- - End
7.3
Inspection Before Powering Up
7.3.1 Inverter
•
Ensure that the AC and DC switches and all internal miniature circuit breakers are
disconnected.
•
Check and ensure that the emergency stop button is released .
•
Check various upstream and downstream electrical switches and buttons, as well as
those on the inverter, to make sure that they can be operated flexibly and meet the
requirements.
•
Check whether the film at the air inlet and outlet are removed.
•
Check whether the pressure relief screw has been removed.
•
Check whether the fuse is installed in the AC SPD.
7.3.2 PV Array
The DC side voltage shall not exceed the maximum DC voltage allowed for the inverter. Oth-
erwise, the inverter may be damaged and even cause safety accidents.
To ensure the stable and efficient operation of the whole system, it is recommended that bat-
teries connected to an inverter should be of the same type and from the same manufacturer,
and the number of batteries connected in series should be the same.
7.3.3 Checking Grid Voltage
•
Measure accurately the grid 3-phase line-to-line voltages: L1-L2, L1-L3, and L2-L3.The
voltages should not exceed the grid permissible voltage and the three phases are in
balance.
Adjust the transfer ratio of the transformer by qualified personnel if the grid voltage
deviation is large.
•
Measure and record the grid frequency. Measured data should not exceed the grid per-
missible frequency.
•
Measure the THD and check the curve if possible. The inverter will stop running if the
THD is serious.
7 Powering up and Powering down
51
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