Fuse Link Selection - ABB SafeLink Installation And Operating Instructions Manual

abb
Transformer
Rating (kVA)
Fuse Link (A)
SLMIO ver 2.12

2.4 Fuse Link Selection

Fuse links must have a barrel length of 292mm and dimensional compliance to
DIN 43625. Fuse links are to comply to IEC 60282-1 with 'medium' striker energy, e.g.
ABB CEF range or equivalent.
The SafeLink has been heat run tested to IEC 60298 under two conditions: with 400A
and 630A maximum ring circuit currents. Under these conditions the maximum
continuous heat dissipation from each fuse canister is 58W and 47W respectively.
The table below, based on ABB CEF backup fuses, gives maximum continuous fuse
current values which are valid for ambient temperatures up to 40°C. Fuse links from
other manufacturers may have markedly different heat generation figures. Where
SafeLink is installed in high ambient temperature environments (over 40°C) please seek
further advice from your local ABB agent; this may apply where the unit is installed in
a padmount enclosure or similar.
Fuse Link Fuse Power
Rating (A) Loss (W)
16 32
25 47
40 52
63 78
80 82
100 103
*
125 125
*
Switch-fuse combination not covered by IEC 60420 type-test certificate for fuse links
greater than 100A.
For example:
If a 1000kVA, transformer with full load current of 52A is to be protected in an 11 kV,
630A ring circuit. Then a 63A fuse link can be used. Alternatively if a 130% overload
of the transformer is required, then a 100A fuse link should be selected.
The figures quoted below are reproduced from the ABB CEF catalogue for line voltages
of 10-12 kV.
100- 200-
160
125 250
16 16-25 25
ABB Ltd, Switchgear Division, Auckland, New Zealand
Installation and Operating Instructions
Ring current of 400A
Max. Current (A), 58W Max. Current (A), 47W
16
25
40
57
71
78
85
315 400 500
25-40 40 40-63
SafeLink
SF Insulated Ring Main Unit
6
Ring current of 630A
16
25
39
52
65
71
79
630-
1000 1250
800
63 63-80 80-100
1500
100
10