Description
52 Revision 03 * INSTALLATION AND OPERATING INSTRUCTIONS 8DJH * 500-8067.9
8.10 Selection of HV HRC fuse-links
Allocation of HV HRC fuses and transformers
The three-position switch-disconnector in the transformer feeder (transformer switch)
was combined with HV HRC fuse-links and tested in accordance with IEC 62 271-105.
The transformer protection table below shows HV HRC fuse-links recommended for
transformer protection. Furthermore, the switchgear also permits fuse protection of
transformers up to ratings of 2000 kVA. Please contact us for such applications.
The protection table applies to:
• Maximum ambient air temperature in the switchgear room of 40°C according to
IEC 62 271-1 considering the influence of the switchgear enclosure
• Requirements according to IEC 62271-105
• Protection of distribution transformers according to IEC 60787
• Rated power of transformer (no overload operation)
The specified HV HRC fuses make SIBA are type-tested partial range fuses according to
IEC 60 282-1. The dimensions correspond to DIN 43625. The HV HRC fuses have a
thermal protection in form of a temperature-limiting striker tripping operating in case of
defective HV HRC fuse-links or high overload currents.
Please contact us if you want to use HV HRC fuses from other manufacturers.
Basis for selection of HV HRC fuse-links:
• IEC 60282-1
• IEC 62271-105
• IEC 60787
• Recommendations and data sheets of fuse manufacturers
• Permissible power loss in the switchgear enclosure at an ambient air temperature
of 40° C
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