Cable Connection; Cable Connection For Cable Feeders, Ring-Main Feeders And Circuit-Breaker Feeders - Siemens 8DJH Installation And Operating Instructions Manual

3 | Description

3.8 Cable connection

3.8.1 Cable connection for cable feeders, ring-main feeders and circuit-breaker
16/174
Fig. 8: HV HRC fuse assembly
Mode of operation
If a HV HRC fuse-link operates, the switch-disconnector is tripped via an articulation which is
integrated into the cover of the fuse box.
Thermal protection
If the fuse tripping fails, the sudden overpressure trips the switch-disconnector via a diaphragm
and the articulation situated in the cover of the fuse box.
The thermal protection works independently of the type and design of the HV HRC fuse-link
used. The thermal protection is maintenance-free and independent of any outside climatic
effects.
Tab. 4: Basic scheme of fuse tripping
The HV HRC fuse-links make SIBA [▶ Page 38, "Selection of HV HRC fuse-links"] release the
striker depending on the temperature and trip the switch-disconnector already in the overload
range of the fuses. Impermissible heating of the fuse box can be avoided in this way.
feeders
For the cable connection, customary cable plugs for interface type C with bolted contact M16 are
used according to EN 50181/DIN EN 50181.
Available designs:
▪ Screened (conductive) design (standard)
▪ On request: Insulated design, e.g. as adapter for conventional sealing ends or mass-
impregnated cables (restrictions for site altitude and ambient climate)
Recommended cable plugs and possible connection cross-sections, [▶ Page 18, "Cable plugs for
single cable connection (interface type C)"]. The installation of other makes and types is possible
on request.
8DJH • Installation and Operating Instructions • Version 11 • 500-8384.9
Fuse box
1
Fuse slide
2
Tripping pin
3
Sealing cover with seal
4
Cap with control electrode
5
HV HRC fuse-link
6
Cable connection (bushing)
7
Switchgear vessel
8
Fuse bushing
9
HV HRC fuse-link in service condition
Tripping of the three-position switch-disconnector through the striker of
the fuse
Tripping of the three-position switch-disconnector via diaphragm and
striker through overpressure, e.g., if HV HRC fuse-link has been inserted in-
correctly