insulated from the other by insulators because the can casing within each rack are at a
certain potential. Refer figure 211 for an example:
Capacitor Unit
(Can)
Rack
IEC09000753_1_en.vsd
IEC09000753 V1 EN
Figure 211: Replacement of a faulty capacitor unit within SCB
There are four types of the capacitor unit fusing designs which are used for
construction of SCBs:
Externally
fused
where an individual fuse, externally mounted, protects each capacitor unit.
Internally fused where each capacitor element is fused inside the capacitor unit
Fuseless where SCB is built from series connections of the individual capacitor units (that is,
strings) and without any fuses
Unfused where, in contrary to the fuseless configuration, a series or parallel connection of the
capacitor units is used to form SCB, still without any fuses
1MRK504116-UUS C Section 3
IED application
495
Application manual
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