Siemens NXAIR Operating Instructions Manual page 141

Replacing HV HRC fuse-links
Preconditions
•
Set of proper HV HRC fuse-links available
•
Contactor truck taken out of the panel
•
High-voltage door closed
Procedure
Step on the bottom side of the truck to stabilize the contactor truck during the replacement of
HV HRC fuse-links.
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Operating the contactor panel with panel width 435 mm
NOTICE
Undetected damage
Tripped HV HRC fuse-links can cause hidden damages on the other HV HRC
fuse-links.
Always replace all HV HRC fuse-links, even if only one HV HRC fuse-link
has tripped.
INFORMATION
Number of installed fuse-links
Usually the contactor truck is equipped with two HV HRC fuse-links per phase.
If only one HV HRC fuse-link per phase is installed, use the upper position
at the clamps.
INFORMATION
Electrical indication of tripped fuse-links
Electrical indications at the panel or in the remote control room are automatically
reset to operating mode by replacing the HV HRC fuse-links.
INFORMATION
Recommended order of action
The HV HRC fuse-links in the middle phase L2 are only accessible after removing
the HV HRC fuse-links from the adjacent phase L3.
First, remove the HV HRC fuse-links from the outer phases L1 and L3 on
the left and right side of the contactor truck. Then go on to remove the
HV HRC fuse-link from the middle phase L2.
NXAIR / ≤ 40 kA
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