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China CTK38 Series Current Transformer - Trusted Suppliers & Factory for Electrical Monitoring & Protection

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As a vital component in electrical systems, a current transformer (CT) plays a crucial role in managing, monitoring, and safeguarding power networks. It effectively transforms high alternating currents (AC) into lower, measurable values, making it an essential tool in various applications, including power generation, transmission, and distribution. Our current transformers are manufactured in our state-of-the-art factory in China, ensuring top quality and reliability. Partnering with trusted suppliers, we provide advanced solutions that connect high-current power circuits to sensitive measurement devices and protective relays, making our CTs ideal for industrial use and beyond.

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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.

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    High Precision Energy Metering CTs require high precision to ensure accurate energy measurement and reduce measurement error.
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    High Voltage Insulation Sufficient insulation is required to sustain high voltage safely between primary and secondary windings.
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    Strong Linearity Enough linearity is needed to minimize measurement error across the full operating range.
    ⚠️ Important Notice: The secondary winding should never be left open circuit while a CT is in use. An open circuit can produce extraordinarily high voltages that may seriously damage electrical equipment and endanger personnel.

    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 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 CT steps down the high primary current to a lower, proportional secondary current — typically 5A or 1A — allowing safe and accurate monitoring of electrical systems.
    Q What is the transformation ratio of a CT?
    The transformation ratio refers to the proportional relationship between the primary current and the secondary current. For example, a CTK38 with a specification of 300A/5A means the primary current of 300A is proportionally reduced to 5A on the secondary side. This ratio enables precise current monitoring without direct exposure to high currents.
    Q Why should the secondary winding of a CT never be left open circuit?
    When the secondary winding of a CT is left open circuit while current flows through the primary, the magnetic flux in the core has no path to dissipate through a load. This causes the core to become saturated and generates extremely high voltages across the secondary terminals, which can damage equipment, destroy insulation, and pose serious safety risks to personnel.
    Q What accuracy grade does the CTK38 current transformer offer?
    The CTK38 current transformer is rated at Accuracy Grade 0.5, with a value of 1.0. This grade ensures high measurement precision, making it suitable for energy metering and industrial monitoring applications where accuracy is critical.
    Q What are the available current specifications for the CTK38 model?
    The CTK38 is available in a range of specifications to suit different application requirements: 100A/5A, 150A/5A, 200A/5A, 250A/5A, 300A/5A, 400A/5A, 500A/5A, and 600A/5A. The burden (AV) ranges from 0.1 to 2.5 depending on the selected specification.
    Q What overload current and lead length specifications apply to the CTK38?
    All CTK38 specifications share the same overload current rating of ≥1.2% ln, ensuring reliable performance under overload conditions. The standard lead length for all CTK38 variants is ≤0.5m, making them compact and easy to integrate into electrical panels and metering systems.