0102030405
China F2 Series Current Transformer - Reliable Suppliers and Factory for High Voltage Solutions
Product Overview
A CT is powered by electromagnetic induction and consists of a main winding (few turns, connected in series with the high-current circuit) and a secondary winding (many turns, coupled to safety or measurement devices). The primary winding receives a large current whereas the secondary winding, which is typically standardized to 5A or 1A for most industrial purposes, receives a proportionately low current. This proportionality, sometimes referred to as the transformation ratio, ensures accurate current measurement without exposing personnel or equipment to potentially dangerous voltages.
- 🎯 High Precision — Essential for accurate energy metering and reliable current monitoring.
- 📈 Strong Linearity — Prevents measurement distortion across the full current range.
- 🛡️ Insulation Strength — Maintains high-voltage separation between primary and secondary windings.
- ⚡ Fault Protection — Provides excellent fault detection to ensure system safety and reliability.
⚠️
Important Notice: While using a CT, the secondary winding should never be open-circuited. An open circuit may result in dangerously high voltages that could seriously harm equipment and personnel. Current transformers are critical to maintaining the reliability, efficacy, and safety of modern electrical systems.
Technical Parameters
| Type | Main Loop Current | (mm) Outline Size | |||||
|---|---|---|---|---|---|---|---|
| F2-1025 | — | 162 | 71 | 28 | 155 | 100 | 25 |
| F2-1435 | < 250A | 202 | — | 28 | 195 | 140 | 35 |
| F2-1835 | < 400A | 242 | 82 | 28 | 235 | 180 | 35 |
| F2-2245 | < 630A | 282 | 92 | 28 | 275 | 220 | 45 |
| F2-3045 | < 1250A | 363 | 92 | 28 | 355 | 300 | 45 |
| Rated Primary Current: 1A | Rated Secondary Current: 0.5mA | ||||||
* All outline dimensions are in millimeters (mm). Specifications subject to change without notice.
Frequently Asked Questions (FAQ)
Q
What is the working principle of a current transformer (CT)?
A current transformer operates on the principle of electromagnetic induction. It consists of a primary winding connected in series with the high-current circuit and a secondary winding coupled to measurement or protection devices. The large primary current induces a proportionally smaller current in the secondary winding, enabling safe and accurate measurement.
Q
What are the standard secondary output currents for industrial CTs?
For most industrial applications, the secondary winding of a CT is standardized to either 5A or 1A. For the models listed in this series, the rated primary current is 1A and the rated secondary current is 0.5mA.
Q
Why should the secondary winding of a CT never be open-circuited?
When the secondary winding is open-circuited while the primary is energized, all the primary current acts as a magnetizing force. This can produce dangerously high voltages across the secondary terminals, potentially damaging the insulation, destroying the CT, and posing a serious safety hazard to personnel.
Q
Which CT model is suitable for currents below 630A?
The F2-2245 model is designed for main loop currents below 630A, with an outline size of 282 × 92 × 28mm and a window opening of 275 × 220mm (45mm depth).
Q
What key performance characteristics should I look for when selecting a CT?
The three most important characteristics are: High Precision (for accurate energy metering), Strong Linearity (to avoid measurement distortion), and Insulation Strength (to safely maintain high-voltage separation between windings). Always match the CT rating to your application's current range.
Q
What is the maximum current capacity available in this CT series?
The largest model in this series, F2-3045, supports main loop currents of up to 1250A, with an overall outline size of 363 × 92 × 28mm. It is suitable for high-current industrial applications requiring robust fault protection and precise monitoring.