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CTFK-1 transformer manufacturer .jpg

Current Transformers (CT) from China Suppliers - High-Quality Factory Components for Power Systems

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A current transformer (CT) is an essential component in electrical systems, designed to control, monitor, and protect power networks. By converting massive alternating currents (AC) into small, measurable quantities, it enables efficient power management. These devices are widely utilized in power generation, transmission, distribution, and industrial applications. In China, numerous suppliers and factories offer high-quality current transformers to meet varied industrial needs, ensuring safety and reliability in high-current power circuits.

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    Product Details

    Product Overview

    A CT is powered by electromagnetic induction and contains two windings: a main winding with a few turns connected in series to the high-current circuit and a secondary winding with several turns connected to safety or measurement devices. The primary winding receives a large current, but the secondary winding, which is typically tuned to 5A or 1A for most industrial applications, receives a little current. This proportionality, also known as the transformation ratio, enables for precise current measurement while protecting personnel and equipment from potentially harmful voltages.

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    Important: Never leave the secondary winding open circuit when utilizing a CT. An open circuit may generate extremely high voltages, which can damage electrical equipment.

    CTs require enough insulation to maintain a high voltage between windings, linearity to reduce measuring error, and high precision for energy metering. Since they allow for more precise current monitoring and enhanced issue avoidance, current transformers are critical to assuring the dependability, efficiency, and safety of contemporary electrical systems.

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    Key Benefits: Precise current measurement · Personnel & equipment protection · Enhanced system reliability & safety

    Technical Parameters

    Type Specification (mm) Outline Size
    A B C D E F M
    CTFK-1025 100A/5A 162 71 28 155 100 25 c5*7
    CTFK-1435 250A/5A 202 81 28 195 140 35 c5*7
    CTFK-1835 400A/5A 242 82 28 235 180 35 c5*7
    CTFK-2245 630A/5A 282 92 28 275 220 45 c5*7
    CTFK-3045 1250A/5A 363 92 28 355 300 45 c5*7
    Accuracy Grade: 1.0 Overload Current: ≥ 1.2% ln

    Frequently Asked Questions (FAQ)

    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 a primary winding connected in series with the high-current circuit and a secondary winding connected to measurement or protection devices. The large primary current is proportionally reduced to a safe, measurable secondary current (typically 5A or 1A), based on the transformation ratio.
    Q Why should the secondary winding of a CT never be left open circuit?
    Leaving the secondary winding open circuit is extremely dangerous. Without a connected load, the magnetic flux in the core is not balanced, which can generate dangerously high voltages across the secondary terminals. These high voltages can damage the CT itself, connected equipment, and pose a serious safety risk to personnel.
    Q What accuracy grade do these CTFK series current transformers support?
    The CTFK series current transformers support an Accuracy Grade of 1.0, which makes them suitable for energy metering and precise measurement applications. This level of accuracy ensures minimal measuring error in industrial and commercial electrical systems.
    Q What current ratings are available in the CTFK series?
    The CTFK series offers a wide range of current ratings to suit various applications, including 100A/5A (CTFK-1025), 250A/5A (CTFK-1435), 400A/5A (CTFK-1835), 630A/5A (CTFK-2245), and 1250A/5A (CTFK-3045). All models output a standard 5A secondary current for compatibility with standard protection and metering instruments.
    Q What is the overload current specification for CTFK series CTs?
    The CTFK series current transformers are rated for an overload current of ≥1.2% ln (1.2 times the rated current). This overload capability ensures the CT can handle temporary current surges without compromising measurement accuracy or causing damage to the unit.
    Q What are the key requirements for a current transformer to function correctly?
    For a current transformer to function correctly and safely, it must have: (1) sufficient insulation to maintain high voltage separation between windings, (2) good linearity to minimize measurement errors, and (3) high precision for accurate energy metering. Additionally, the secondary winding must always remain connected to an appropriate burden (load) during operation.