460-480 Tyco Electronics, 460-480 Datasheet - Page 135

• 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

Secondary Turn Ratio Modification
Application Guide
Formula:
Where:
Example: A 300:5 Current Transformer –
(In practicality one turn is dropped from the secondary as a ratio correction factor.)
The ratio of the current transformer can be modified by altering the number of secondary
turns by forward or backwinding the secondary lead through the window of the current
transformer.
By adding secondary turns the same primary amperage will result in a decrease in
secondary output. By subtracting secondary turns the same primary amperage will result in
greater secondary output.
Again using the 300:5 example adding five secondary turns will require 325 amps on the
primary to maintain the 5 amp secondary output or
Deducting 5 secondary turns will only require 275 amps on the primary to maintain the 5
amp secondary output or
The above ratio modifications are achieved in the following manner:
To add secondary turns, the white lead should be wound through the CT from the side
opposite the polarity mark.
To subtract secondary turns the white lead should be wound through the CT from the same
side as the polarity mark.
1p
–––
1s
lp
ls
Np
Ns
300p
–––––
5s
325p
–––––
5s
275p
–––––
5s
=
–
–
–
–
=
=
=
Ns
–––
Np
Primary Amperage
Secondary Amperage
Number of Primary Turns
Number of Secondary Turns
60s
–––
1p
65s
–––
1p
55s
–––
1p
139