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CTK38 Series Current Transformer - Reliable Performance from China Suppliers and Factory for Power System Monitoring

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Discover the essential role of a current transformer (CT) in modern electrical systems. As a key component manufactured in China, our current transformers provide a reliable solution for controlling, monitoring, and protecting your power systems. Designed to reduce high alternating currents (AC) to manageable, measurable values, these transformers are critical for power generation, transmission, and distribution applications. Trusted by numerous suppliers and factories, our CTs seamlessly connect high-current power circuits to sensitive measuring devices and protective relays, ensuring safety and efficiency in industrial operations.

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    Product Details

    ⚙ Product Overview

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

    ⓘ CTs need high precision for energy metering, enough linearity to reduce measurement error, and enough insulation to sustain high voltage between windings.
    ⚠ Important: The secondary winding should never be open circuit while utilizing a CT. An open circuit may produce extraordinarily high voltages that could damage electrical equipment.

    In conclusion, current transformers are essential to guaranteeing the dependability, effectiveness, and safety of contemporary electrical systems since they allow for more accurate current monitoring and increased fault avoidance.

    📊 Technical Parameters
    Type Specification Burden (AV) Accuracy Grade: 0.5 Overload Current Lead Length
    CTK38 100A / 5A 0.1 1.0 ≥ 1.2% ln ≤ 0.5m
    150A / 5A 0.1
    200A / 5A 0.1
    250A / 5A 1
    300A / 5A 1
    400A / 5A 1
    500A / 5A 2.5
    600A / 5A 2.5
    ❓ Frequently Asked Questions
    Q What is the primary function of a Current Transformer (CT)?
    A Current Transformer (CT) is used to step down high currents to a lower, measurable value — typically 5A or 1A — through electromagnetic induction. This allows safe and accurate current monitoring for measurement and protection devices without direct exposure to high-voltage circuits.
    Q What does the transformation ratio mean in a CT?
    The transformation ratio refers to the proportional relationship between the primary (high) current and the secondary (low) current. For example, a specification of 400A/5A means that a primary current of 400A is proportionally reduced to 5A on the secondary side, enabling safe and precise measurement.
    Q Why should the secondary winding of a CT never be left open circuit?
    Leaving the secondary winding open circuit while the CT is energized can result in dangerously high voltages being induced across the secondary terminals. This can cause insulation breakdown, equipment damage, or even serious safety hazards to personnel. Always ensure the secondary is connected to a burden or short-circuited when not in use.
    Q What accuracy grade does the CTK38 current transformer support?
    The CTK38 current transformer supports an accuracy grade of 0.5, with a rated accuracy class value of 1.0. This level of precision makes it well-suited for energy metering and industrial measurement applications where accurate current readings are critical.
    Q What current specifications are available for the CTK38 model?
    The CTK38 model is available in a wide range of specifications to suit different applications: 100A/5A, 150A/5A, 200A/5A, 250A/5A, 300A/5A, 400A/5A, 500A/5A, and 600A/5A. The burden (AV) varies from 0.1 to 2.5 depending on the selected specification.
    Q What is the maximum lead length for the CTK38 current transformer?
    The maximum lead length for the CTK38 current transformer is ≤ 0.5 meters. This applies across all available specifications of the CTK38 model. Keeping the lead length within this limit ensures signal integrity and measurement accuracy.