System Manual
54
frequently.
If the MV Station is located in desert areas, it is advisable to check thoroughly the MV Station
inside and outside and clean completely after the sand storm.
Before performing maintenance, remove the internal protective grid. Make sure to
reassembly the grid and fasten all the screws after the maintenance work.
Make sure all bolts are securely fixed.
Repair immediately any anomalies found during routine maintenance. If there are any
doubts, contact Sungrow.
10.3
Maintenance Items
Check item
Check method
General check
Check the tightness of the transformer and slightly retighten
the screws, if necessary.
For the tap changer, perform a switching test across the
entire range when the transformer is under voltage-free
conditions.
Remove any rust patches and repaint.
Check and clean the cable entries, protective device.
Check the contacts of the low-voltage terminals for
discoloration.
Check whether the protective covers of the low-voltage
terminals are present and intact.
Check whether the contacts of the medium-voltage terminals
are intact.
Clean the insulators.
Check the function and settings.
Check and lubricate the rubber seals on the cable entries.
Check the MV transformer for operating noise.
Check the grounding of the transformer.
Transformer
monitoring
protection devices
Oil temperature indicator: Oil temperature is at the normal
level.
Pressure relief valve: Check the contact of the pressure relief
