Wego Solid Core Current Transformers
Solid core Current Transformers (CTs) look like donuts with wires attached. These ring-shaped devices slip over the power lines and measure the electrical current flowing through the line. The CT "secondary" wires connect to the meter, facilitating power and energy calculations.
Solid core CTs are very accurate (0.3% maximum error), small in size, and inexpensive. However, power must be turned off and the circuit opened, generally at a circuit breaker, so that the solid core CT can be slipped over the power line. After installation the power wire must be reconnected to close the electrical circuit. Installation usually only takes a minute or two per CT.
Specification
Dimensions
| A | B | C (Max.) | D | E1 | |
|---|---|---|---|---|---|
| Inches | 0.67 | 1.65 | 0.71 | 1.83 | 48.00 |
| Millimeters | 17.0 | 42.0 | 18.0 | 46.5 | 1219 |
1Standard lead length. Dimension tolerance ± 0.10" unless otherwise noted. CTs approved for lead lengths up to 500 ft. at rated accuracy. Lead wires are UL1015, 18 AWG, rated at 600V.
Electrical Characteristics
For safety considerations, an open circuit protection feature is provided by an internal bi-directional 6.8 volt TVS.
| Model Numbers | Current (Max.) | Ratio | Ratio Err | Phase Err | Burden Resistor | BIL |
|---|---|---|---|---|---|---|
| CT100148XX | 110 Amps | 100:0.1 | < 0.1% | < 6' | 21 Ohms Max. | 10 KV |
| CT200148XX | 220 Amps | 200:0.1 | < 0.1% | < 6' | 21 Ohms Max. | 10 KV |
Physical Characteristics
Current transformer labels are color coded and depict the correct orientation for easy installation. The black lead wire connects to the X1 terminal at the meter, the white wire lead always connects to X2 at the meter. A white dot on the CT body will indentify the H1 side, which faces the incoming line. Refer to meter hookup diagrams for more information. See figure 1.
| Model Numbers | Body Color | Phase/Label Color | Description |
|---|---|---|---|
| CT100148BKSO-0.67 | Gray | Black | 100A current transformer |
| CT100148RDSO-0.67 | Gray | Red | 100A current transformer |
| CT100148BLSO-0.67 | Gray | Blue | 100A current transformer |
| CT200148BKSO-0.67 | Black | Black | 200A current transformer |
| CT200148RDSO-0.67 | Black | Red | 200A current transformer |
| CT200148BLSO-0.67 | Black | Blue | 200A current transformer |