Service information
139-2021.9 / 07
NXAIR M
241
25.3 Visual inspection
The visual inspection is performed every year or at the operator's discretion.
General check for paint damages on all panels of a switchgear assembly in the area of
the front doors, the lateral and the rear termination. If required, repair damages.
General check of the switchgear for dust layers, especially of the ventilation units in the
pressure relief duct, as well as the fan box.
Clean dust layers on the units by using a customary vacuum cleaner without damaging
the metal grids (1) or ventilation slots (2).
Fig. 397: View from above onto a ventilation
unit in the pressure relief duct
Fig. 398: View from above onto a ventilation
unit in the pressure relief duct
Fig. 399: Exemplary view of a ventilated
panel with ventilation slots in
the high-voltage door
General check for humidity. To do this, open the high-voltage door of the switching-
device compartment of every third panel and check the switching-device compartment
for humidity or condensation.
If there is humidity or condensation inside a switching-device compartment, determine
the cause thereof. To do this, do also observe the climatic conditions of the switchgear
room, and arrange for suitable measures such as room ventilation or room heating.
General check for partial discharge noises. If there are any partial discharge noises,
determine the cause thereof and take adequate countermeasures.
Check whether the accessories are complete.
1
2
