39
70-71
14
1
30a
30b
2
Fig. 18a
Fig. 18b
Fig. 18c
7.7. Instructions for dismantling and
replacing fuses
7.7.1. General
• All the operations described below must be
carried out by suitably qualified personnel
with in-depth knowledge of the apparatus.
• Do not rack the contactor out unless
the enclosure is securely fixed in the
switchgear or to a stable base.
• Check that the contactor is open before
proceeding with isolation and its racking-
out from the enclosure.
• Check that the contactor is open before
proceeding with replacement of the fuses.
• The contactor is preset to house ABB
CMF/BS and ABB CEF/BS fuses.
The fuseholder is preset for installation of fuses with the
dimensions and average type of striker according to DIN
43625(1983)andBS2692(1975)Standardsandwith
electricalcharacteristicsaccordingtoIEC282-1(1974)
Standards.
The fuseholder is always fitted with an automatic opening
device for a fuse blowing. This device prevents contactor
closing when even a single fuse is missing.
7.7.2. Preliminary operations for fuse replacement
a) VSC/P
The contactor must be racked out of the enclosure for
replacement of the fuses.
The instructions for the racking-out operations are given in
the switchgear/enclosure manuals.
Withthecontactorrackedoutoftheswitchgear,unscrew
the four fixing screws of the shield and relative DIN washers
(fig.18a)andpositionitasinfig.18b.For12kVcontactors,
removeprotection(2)and(fig.18c)proceedtoreplacethe
fuses according to the instructions given in par. 7.8.
b) VSC/PN and VSC/PNG
To replace the fuses it is necessary to rack the contactor
out of the enclosure. The instructions for the racking-out
operationsaregivenintheswitchgear/enclosuremanuals,
then proceed to replace the fuses according to the
instructions given in par. 7.8.
NEPSI.COM - Northeast Power Systems. Inc.
To Next Page
Loading...
Need help?
General
