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CT3D Series Current Transformer - Reliable Solutions from China Suppliers and Factory for Power Management and Protection

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A current transformer (CT) is an essential electrical device used for monitoring, managing, and protecting power supplies. It generates small, measurable amounts of high alternating currents (AC), making it critical in various applications, including power generation, transmission, and distribution. As a leading factory in China, we provide top-quality current transformers that ensure reliable performance in high-current power circuits, often interfaced with safety relays or precision measurement instruments. Our products, sourced from trusted suppliers, meet rigorous standards to enhance the safety and efficiency of industrial applications.

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    Product Details

    ⓘ Product Overview

    A CT operates on electromagnetic induction and has two windings: a main winding with a few turns linked in series to the high-current circuit, and a secondary winding with many turns connected to safety or measurement devices. The primary winding receives a significant current, but the secondary winding, which is usually tuned to 5A or 1A for most industrial applications, receives very little current. This proportionality, also known as the transformation ratio, allows for accurate current monitoring while safeguarding workers and equipment from potentially dangerous voltages.

    CTs require linearity to minimize measurement error, high precision for energy metering, and enough insulation to maintain a high voltage between windings. Finally, current transformers are critical to ensuring the reliability, efficacy, and safety of modern electrical systems because they enable more precise current monitoring and improved issue diagnosis.

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    ⚠ Important Safety Notice: When utilizing a CT, you should never leave the secondary winding open circuit. This is owing to the likelihood of extremely high voltages generated by an open circuit, which might harm electrical equipment.

    ⚡ Electromagnetic Induction
    🎯 High Precision Metering
    🔒 High Insulation Grade
    📈 Accurate Current Monitoring
    ⚙ Technical Parameters
    Type Specification (mm) Outline Size
    A B C D E F G
    CT3D-100 100A / 5A 122.5 78.5 43 35.5 22 19.5 76
    CT3D-250 250A / 5A 134 84.5 43 35.5 27 22 87
    CT3D-400 630A / 5A 173.5 109 43 35.5 37 32 127
    CT3D-630 1000A / 5A 211 120 43 35.5 44 46 165
    Accuracy Grade: 1.0 Overload Current: ≥ 1.2% ln
    ? Frequently Asked Questions
    Q What is a Current Transformer (CT) and how does it work?
    A Current Transformer (CT) operates on the principle of electromagnetic induction. It consists of two windings: a primary winding connected in series with the high-current circuit and a secondary winding connected to measurement or protection devices. The CT steps down the high primary current to a safe, proportional secondary current (typically 5A or 1A) for accurate monitoring.
    Q Why should you never leave the secondary winding of a CT open circuit?
    Leaving the secondary winding open circuit is extremely dangerous. Without a connected load, the CT generates extremely high voltages across the secondary terminals, which can damage electrical equipment, destroy insulation, and pose a serious safety risk to personnel. Always ensure the secondary winding is connected to a load or short-circuited before disconnecting any measuring device.
    Q What accuracy grade do the CT3D series current transformers support?
    The CT3D series current transformers are rated at Accuracy Grade 1.0, which is suitable for energy metering and general industrial measurement applications. They also support an overload current of ≥ 1.2% ln, ensuring reliable performance under varying load conditions.
    Q What current ratios are available in the CT3D series?
    The CT3D series is available in multiple current ratio options to suit different application requirements: CT3D-100 (100A/5A), CT3D-250 (250A/5A), CT3D-400 (630A/5A), and CT3D-630 (1000A/5A). All models output a standardized 5A secondary current for compatibility with common measurement instruments.
    Q What are the key requirements for proper CT installation and operation?
    For proper CT operation, ensure: (1) the secondary winding is never left open circuit; (2) sufficient insulation is maintained between windings to handle high voltages; (3) the CT is matched to the correct current ratio for the circuit; and (4) linearity is maintained to minimize measurement errors, particularly for energy metering applications.
    Q What are the typical applications of the CT3D series current transformers?
    The CT3D series current transformers are widely used in industrial power systems for energy metering, current monitoring, overload protection, and fault diagnosis. They are compatible with energy meters, protection relays, power analyzers, and other standard measurement devices that accept 5A secondary input signals.