51
13.1 Inspection
Please follow the inspection instruction below:
Once per year
Check the door tightness, cable bushings, MDU protective cabinet and
control panel’s ventilation device
Once per year
Check the tightness of tap-changer head cover, protective relay and
all pipes’ connectors.
Once per year
Check the MDU’s protective cabinet and if the heater inside
the control panel works normally or not.
Check if the protective relay functions normally.
Once per year
Check whether the silica gel desiccant in the transformer oil
conservator is working properly
Once per year
or every 20000 operations
Check the oil sample. If it doesn’t meet the parameters in Table 13-2,
it’s recommended to change the transformer oil.
Table 13-1 Inspection instruction
Limit values for insulating oil in accordance with IEC 60296
When commissioning the transformer for the first time
＞
＜
During operation
＞
＜
＞
＜
＞
＜
Limit values for natural esters in accordance with IEC 62770
When commissioning the transformer for the first time
＞
During operation
＞
＞
＞
Table 13-2 Oil sample limit values
To Next Page
Loading...
