Mainly Recommended for Maintenance Activities
Table 17 Routine maintenance, cubicle with VCB
|
LV Compartment |
|
Visual inspection of auxiliaries equipment |
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Visual inspection of wiring connections (tightening, fixing, and proper connection) |
|
Cubicle |
|
Cleaning cubicle/dedusting/internal equipment |
|
Inspection of the position indicators and signalling micro switches |
|
Perform and verify manual operations |
|
Perform and verify electrical operations |
|
Shutters visual inspection if applicable (chalking, cracking, and signs of heating) |
|
Check keylocks and padlocks, if present |
|
Check voltage indication devices |
|
Cables Compartment |
|
Inspection of cables (tighting, chalking, and signs of heating) |
|
Inspection of wiring connections (tightening and fixing) |
|
CT/VT Compartment |
|
Cleaning/inspection of isolators (chalking, cracking, and signs of heating) |
|
Cleaning/inspection of TPs (tightening, chalking, cracking, and signs of heating) |
|
Busbar Compartment |
|
Inspection of busbars (cleaning, tightening, chalking, cracking, and signs of heating) |
|
Inspection of isolator switches (cleaning, tightening, chalking, cracking, and signs of heating) |
|
VCB(1) |
|
General state: visual checking, cleanliness, insulator condition, oxidation, and no corrosion of supporting structure |
|
Checking of number of operation |
|
Cleaning of resin bodies |
|
Inspection of state of the auxiliaries contact (ON/OFF, rack-in, and rack-out etc.) |
|
Inspection of functional and safety interlock on device |
|
Checking of LV plug if applicable |
|
Perform ON/OFF operation |
|
Perform rack IN/OUT operation if applicable |
|
Fuses |
|
Cleaning/visual inspection of fuse (chalking, color, cracking, and corrosion) |
|
Cleaning/visual inspection of fuse fixing |
|
Cleaning/Visual inspection of fuse signaling micro switch |
|
Cleaning/visual inspection of fuse striker |
|
(1)Please refer to specific VCB documentation for further details. |
Table 18 Intermediate maintenance
|
LV Compartment |
|
– |
|
Cubicle |
|
Verification of locking + interlocking mechanism function |
|
Verification of withdrawal mechanism |
|
Verification of the shutters |
|
Cables Compartment |
|
– |
|
CT/VT Compartment |
|
TP withdrawal mechanism inspection if applicable |
|
Busbar Compartment |
|
– |
|
VCB(1) |
|
Cleaning/checking/light greasing of the power contacts (plugs and sliding contacts) |
|
Fuses |
|
Verification of fuse (chalking, color, cracking, corrosion) |
|
Verification Inspection of fuse fixing |
|
Verification Inspection of fuse signaling micro switch |
|
Verification /Inspection of fuse striker and linkages |
|
(1)Please refer to specific VCB documentation for further details. |
Table 19 Manufacturer maintenance
|
LV Compartment |
|
Inspection/Verification of protection relay (setting and tripping functions) |
|
Inspection/verification of logic selectivity |
|
ProDiag relay analysis |
|
Cubicle |
|
Verification of switch line operating mechanism |
|
Cleaning/checking of isolators (tightening, chalking, cracking, and signs of heating) |
|
Cleaning/checking of earthing switch operating mechanism |
|
Cleaning/checking/greasing of earthing switch plugs |
|
Cleaning/checking/greasing of shutter locking system |
|
ProDiag corona analysis |
|
Cables Compartment |
|
Verification of isolators (chalking, cracking, and signs of heating) |
|
Verification of TPs (tightening, chalking, cracking, and signs of heating) |
|
Busbar Compartment |
|
Verification of busbars (cleaning, tightening, chalking, cracking, and signs of heating) |
|
Verification of isolator switches (cleaning, tightening, chalking, cracking, and signs of heating) |
|
VCB(1) |
|
Measurement of main contact resistance (micrometer) |
|
Cleaning/checking/greasing of the moving withdrawable parts |
|
Checking of coupling rods |
|
Cleaning/checking/greasing of the operating mechanism |
|
Cleaning/checking/greasing of the latching mechanism |
|
Cleaning/checking/greasing of the closing and opening springs |
|
Cleaning/checking/greasing of the motor and redactor |
|
Cleaning/checking/greasing of all linkages |
|
Check LV electrical wiring connections |
|
ProDiag CB analysis |
|
Fuses |
|
Verification /greasing of fuse striker and linkages |
|
ProDiag fuse analysis |
|
(1)Please refer to specific VCB documentation for further details. |