Página 100 - elastimold

Versión de HTML Básico

Recommended Fuse Current Ratings (Amperes)
1-Phase
Transformer
kVA
Transformer 1-Phase Voltage Rating (kV) Phase-to-Ground
2.4
4.16
4.8
7.2
7.62
12
14.4
16
A B A B A B A B A B A B A B A B
10
6
6
a
3
3
3
6
a
6
a
(3)
a
15
10
6
6
a
3
3
6
a
6
a
(3)
a
25
12
20
8
8
6
6
6
a
6
a
(3)
37.5
20
25
12
12
8
8
6
6
a
(6)
a
50
25
40
18
20
12
20
10
12
10
6
6
(6)
a
75
45
65
20
30
20
25
12
20
12
18
10
8
(8)
100
65
80
30
45
25
40
18
25
18
25
12
18
10
12
(10)
167
65
80
45
65
25
45
25
45
18
(25)
18
20
(12)
(20)
250
80
80
45
65
45
65
(25)
(45)
20
(30)
(20)
(30)
333
65
80
(40)
(30)
(45)
(25)
(45)
500
(45)
(45)
FuseVoltage
. kV
1 . kV (1 . kV)
BLE – R
nd d EF –E: E Fu at 0°C
i nt
atu
NOTES FOR TABLES 32 AND 33:
Column A = 140-200% of transformer rating and Column B = 200-300% of transformer rating.
• Ratings in parenthesis are 17.2kV fuses.
• 8.3kV 3-45A fuses and 15.5kV 6-20A fuses are used in the small elbow housing. 8.3kV 65-80A fuses and 17.2kV 3-45A fuses are used in the large elbow
fuse housing.
• Recommended fuses meet inrush criteria of 12 times transformer full load current for 0.1 second and 25 times transformer full load current for 0.01 second.
Fuses also meet cold load pickup criteria of 6 times transformer full load current for 1 second and 3 times transformer full load current for 10 seconds.
a Fuse allows greater than 300% of transformer rating.
b Recommendations limited to gnd -gnd transformers with no more than 50% delta connected secondary load, and involve certain assumptions.
Phase-to-ground rated fuses are frequently recommended for gnd -gnd three phase transformers.
Recommended Fuse Current Ratings (Amperes)
3-Phase
Transformer
kVA
Transformer 3-Phase Voltage Rating (kV) Phase-to-Phase
2.4
4.16
4.8
7.2-7.96
8.32
12.47
13.2-14.4
20.8
b
22.9-24.9
b
A B A B A B A B A B A B A B A B A B
15
6
3
3
3
a
3
a
6
a
6
a
6
a
(3)
a
22.5
8
6
a
6
a
3
3
6
a
6
a
6
a
(3)
a
30
10
12
6
6
6
a
3
6
a
6
a
6
a
(3)
a
45
12
20
10
8
6
6
a
6
a
6
a
6
a
(3)
a
75
20
30
12
20
12
8
8
6
6
6
a
(3)
100
30
45
18
25
18
20
12
10
8
8
6
a
(6)
a
112.5
40
65
20
25
18
25
12
12
8
8
6
(6)
a
150
45
80
25
40
20
30
18
20
12
20
10
12
10
12
6
(6)
200
65
80
40
65
30
45
20
25
18
25
12
18
12
18
8
10
(8)
225
80
45
65
40
65
20
30
20
25
12
20
12
18
8
10
(10)
300
65
80
45
80
30
45
25
40
18 (25)
18 (25)
12
18
(12)
500
80
65
80
45
80 (30)
(45)
(30)
(45)
18 (25)
(18)
(25)
750
80
80
(45)
(25)
(45)
(25)
(40)
1000
(40)
(40)
FuseVoltage
. kV
1 . kV (1 . kV)
BLE – R
nd d EF –E: E Fu at 0°C
i nt
atu
PROTECTION AND CONTROL
Molded Fuse Products
Fused Elbow