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China CTF2 Series Current Transformers - Reliable Suppliers & Factory for Power Monitoring & Protection
Product Overview
A CT uses electromagnetic induction and is made up of two windings: a secondary winding with several turns connected to safety or measurement devices, and a primary winding with a few turns connected in series to a high-current circuit. The primary winding receives a lot of current, whereas the secondary winding, which is typically tuned to 5A or 1A for the majority of industrial applications, receives very little. This proportionality, sometimes referred to as the transformation ratio, permits precise current monitoring while shielding personnel and equipment from dangerous voltages.
CTs require high precision for energy metering, linearity to reduce measurement errors, and enough insulation to maintain a high voltage between windings. When using a CT, never leave the secondary winding open circuit. This is because an open circuit has the ability to generate extremely high voltages, which can harm electrical equipment. Finally, since they allow for more exact current monitoring and issue detection, current transformers are critical to the dependability, efficiency, and safety of contemporary electrical systems.
CTs require high precision for energy metering, linearity to reduce measurement errors, and enough insulation to maintain a high voltage between windings. When using a CT, never leave the secondary winding open circuit. This is because an open circuit has the ability to generate extremely high voltages, which can harm electrical equipment. Finally, since they allow for more exact current monitoring and issue detection, current transformers are critical to the dependability, efficiency, and safety of contemporary electrical systems.
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Electromagnetic Induction
Dual-winding design for safe high-current measurement.
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High Precision Metering
Ensures linearity and minimizes measurement errors.
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Strong Insulation
Maintains high voltage isolation between windings.
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Safety Critical
Never leave secondary winding in open circuit condition.
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Important Safety Notice: Never leave the secondary winding open circuit during operation. An open circuit can generate extremely high voltages, potentially causing serious damage to electrical equipment and posing a safety hazard.
Technical Parameters
| Type | Specification | (mm) Outline Size | ||||||
|---|---|---|---|---|---|---|---|---|
| A | B | C | D | E | F | M | ||
| CTF2-1025 | 100A/5A | 162 | 71 | 28 | 155 | 100 | 25 | c5*7 |
| CTF2-1435 | 250A/5A | 202 | 81 | 28 | 195 | 140 | 35 | c5*7 |
| CTF2-1835 | 400A/5A | 242 | 82 | 28 | 235 | 180 | 35 | c5*7 |
| CTF2-2245 | 630A/5A | 282 | 92 | 28 | 275 | 220 | 45 | c5*7 |
| CTF2-3045 | 1250A/5A | 363 | 92 | 28 | 355 | 300 | 45 | c5*7 |
| Accuracy Grade: 1.0 | Overload Current: ≥1.2% ln | |||||||
Frequently Asked Questions
❓ What is a current transformer (CT) and how does it work?
A current transformer (CT) works on the principle of electromagnetic induction. It consists of a primary winding connected in series with a high-current circuit and a secondary winding connected to measuring or protection devices. The CT steps down the high primary current to a lower, safer secondary current (typically 5A or 1A) proportional to the original, enabling safe and accurate measurement.
❓ Why should the secondary winding of a CT never be left open circuit?
Leaving the secondary winding open circuit while the primary is energized can cause the CT core to saturate and generate dangerously high voltages across the secondary terminals. This can damage the transformer, connected equipment, and pose a serious safety risk to personnel. Always ensure the secondary is connected to a load or short-circuited before disconnecting instruments.
❓ What accuracy grade do these CTF2 series current transformers offer?
The CTF2 series current transformers provide an accuracy grade of 1.0, which is suitable for energy metering and industrial measurement applications. This grade ensures reliable and precise current readings within defined error limits.
❓ What current ratios are available in the CTF2 series?
The CTF2 series covers a wide range of current ratios to suit various industrial applications, including 100A/5A, 250A/5A, 400A/5A, 630A/5A, and 1250A/5A, corresponding to models CTF2-1025 through CTF2-3045.
❓ What does the overload current specification ≥1.2% ln mean?
The overload current specification of ≥1.2% ln indicates that the CTF2 series transformers can handle overload currents of at least 1.2 times the rated primary current (ln) without significant degradation in performance or accuracy, ensuring durability in demanding electrical environments.
❓ How do I select the right CTF2 model for my application?
To select the correct CTF2 model, consider the maximum primary current in your circuit, the required physical dimensions (outline size A–M), and the installation space available. Match the rated current ratio to your system's operating current range, and ensure the mounting dimensions align with your panel or switchgear requirements.