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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) and BS 2692 (1975) Standards and with
electrical characteristics according to IEC 282-1 (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.
With the contactor racked out of the switchgear, unscrew
the four fixing screws of the shield and relative DIN washers
(fig. 18a) and position it as in fig. 18b. For 12 kV contactors,
remove protection (2) and (fig. 18c) proceed to replace the
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
operations are given in the switchgear/enclosure manuals,
then proceed to replace the fuses according to the
instructions given in par. 7.8.
NEPSI.COM - Northeast Power Systems. Inc.