460-480 Tyco Electronics, 460-480 Datasheet - Page 133

• Manufacturer Part Number: 460-480
• Description: Voltage Transformer
• Manufacturer: Tyco Electronics
• Series: 460r

Specifications of 460-480

• Turns Ratio: 4
• Transformer Mounting: Chassis
• Voltage Ratio: 480
• Primary Voltages: 480V
• Power Rating: 150VA
• Output Voltage: 120V
• Mounting Type: Foot Mounted
• Transformer Type: Voltage
• Lead Free Status / RoHS Status: na

In summary, with the use of primary/secondary turns it is possible to modify any CT ratio.
Since low ratio CT’s generally have poorer performance characteristics and high ratio CT’s
have better performance. By using added primary/secondary turns you can modify a higher
ratio CT to have a lower ratio and enjoy the better performance of the higher ratio.
Use This Table To Determine Size Window Needed for Number and
Primary Conductor(s)
Burden
Burden is the opposition to the flow of current from the transformers secondary. Burden
may be expressed in terms of resistance or volt amperes. The following table may be used
to convert volt ampere values to resistance values for 5 amp secondary CT’s:
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
7.0
Volt Ampere (VA)
Insulation
Type RHW
Window Diameter
Resistance ( Ω OHMS)
0.02
0.04
0.05
0.08
0.10
0.12
0.14
0.16
0.18
0.20
0.22
0.24
0.26
0.28
AWG
MCM
14
12
10
8
6
4
3
2
1
0
00
000
0000
250
300
350
400
500
600
700
750
1
⁄
3
3
2
1
1
1
1
–
–
–
–
–
–
–
–
–
–
–
–
–
–
2
"
3
⁄
6
5
4
2
1
1
1
1
1
1
–
–
–
–
–
–
–
–
–
–
–
4
"
1"
10
9
7
4
2
1
1
1
1
1
1
1
1
–
–
–
–
–
–
–
–
7.5
8.0
8.5
9.0
9.5
10.0
12.5
15.0
20.0
25.0
45.0
50.0
75.0
100.0
Volt Ampere (VA)
1
25
21
18
9
6
5
4
4
3
2
1
1
1
1
1
1
1
1
1
1
–
1
⁄
2
"
2"
41
35
29
16
11
8
7
6
5
4
3
3
2
1
1
1
1
1
1
1
1
2
58
50
41
22
15
12
10
9
7
6
5
4
4
3
3
2
1
1
1
1
1
1
⁄
2
"
90
77
64
35
24
18
16
14
11
9
8
7
6
5
4
4
3
3
2
1
1
3
Resistance ( Ω OHMS)
0.30
0.32
0.34
0.36
0.38
0.40
0.50
0.60
0.80
1.00
1.80
2.00
3.00
4.00
3
121
103 132
86 110
47
32
24
22
19
14
12
11
9
8
6
5
5
4
4
3
3
3
1
⁄
2
"
155
60
41
31
38
24
18
16
14
12
10
8
7
6
6
5
4
3
3
4"
–
–
–
94
64
50
44
38
29
25
22
19
16
13
11
9
8
6
6
5
10
5"
–
–
–
137
93
72
63
56
42
37
32
28
24
19
17
15
14
11
9
8
8
6"
135