Recommended sequence of operations
General instructions
IG-136-EN version 10; 23/06/2016
57
cgm.3 system
Fully SF6 gas insulated medium voltage switchgear up to 40.5 kV in accordance with IEC Standards
5.9.1 Selection of recommended fuses
The fuses recommended for use in the fuse protection
functional unit are defined according to tests carried out
by the manufacturers. The following table shows the
recommended fuse ratings according to the U
r
/P
transf.
ratio:
U
r
[kV] Transformer rated power [kVA]
Network Cubicle 100 125 160 200 250 315 400 500 630 800 1000 1250 1600 2000
Rated fuse current (A) IEC 60282-1
25 36 6.3 10 16 16 16 20 20 31.5 31.5 40 40 50 63 80*
30 36 6.3 6.3 10 16 16 16 20 20 31.5 31.5 40 40 63 63
35/36 40.5 6.3 6.3 10 16 16 16 20 20 31.5 31.5 40 40 50 63
Considerations:
• General operating conditions: without overload
and temperature < 40 ºC.
• The values marked with an (*) correspond to
SSK-type fuses.
• Recommended fuses: SIBA 20/36 kV, type
HHD, medium type striker, for functional units
up to 36 kV and SIBA HHD TB 40.5 kV, medium
type striker, for functional units up to 40.5 kV
(conforming to IEC 60282-1).
• For other makes and overcharge protection,
check with Ormazabal.
• If any of the fuses blows, we recommend
changing all three.
• Temperature-rise testing of the fuse switch
assembly, according to IEC 62271-105.
Transfer currents according to IEC 62271-105:
The transfer currents have been tested in accordance with
the following parameters:
U
r
Fuse [kV]
U
r
Cubicle
[kV]
I
r
Fuse
[A]
I
transfer
[A]
36 36
Type SSK
80
820
40.5 40.5
Type HHD
63
700
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