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China CTY2 Series Current Transformer - Reliable Power Monitoring Solutions from Top Suppliers and Factory

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A current transformer (CT) is a crucial electrical device used to control, monitor, and safeguard power supply systems. In China, leading suppliers provide high-quality CTs designed for various applications, including power generation, transmission, and industrial use. These transformers convert massive alternating current (AC) into small, measurable quantities, ensuring safety and precision. Our factory specializes in producing reliable current transformers that can be seamlessly integrated with safety relays and sensitive measurement devices, making them indispensable in high-current power circuits.

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    Product Details

    Product Overview

    A CT employs electromagnetic induction and consists of two windings: a main winding with a few turns linked in series to a high-current circuit and a secondary winding with several turns connected to safety or measurement devices. The secondary winding, which is normally tuned to 5A or 1A for the bulk of industrial applications, receives very little current, whereas the main winding receives a lot. This proportionality, also known as the transformation ratio, protects people and equipment from unsafe voltages while allowing for accurate current monitoring.

    CTs require high precision for energy metering, linearity to minimize measurement error, and enough insulation to sustain a high voltage between windings.

    Important: When using a CT, the secondary winding should never be left open circuit. An open circuit has the potential to produce extremely high voltages that might damage electrical equipment.

    Since they enable more precise current monitoring and problem diagnosis, current transformers are essential to the reliability, efficiency, and safety of modern electrical systems.

    Technical Parameters
    Type Specification (mm) Outline Size
    c A B C D M
    CTY2-30 60A / 5A 30 89 70 28 80 c5*7
    CTY2-45 OOA / 5A 45 104 85 28 95 c5*7
    CTY2-65 250A / 5A 65 124 105 28 115 c5*7
    CTY2-80 400A / 5A 80   122 28 132 c5*7
    CTY2-100 630A / 5A 100 162 142 28 ln 152 c5*7
    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) uses electromagnetic induction to measure high currents safely. It consists of a primary winding connected in series with a high-current circuit and a secondary winding connected to measurement or protection devices. The CT steps down the high current proportionally — typically to 5A or 1A — enabling safe and accurate monitoring.
    Q Why should the secondary winding of a CT never be left open circuit?
    Leaving the secondary winding open circuit is dangerous because it can generate extremely high voltages across the secondary terminals. These voltages can damage insulation, destroy connected equipment, and pose a serious safety risk to personnel. Always ensure the secondary is connected to a burden (load) or short-circuited when not in use.
    Q What accuracy grade do the CTY2 series current transformers offer?
    The CTY2 series current transformers are rated at Accuracy Grade 1.0, which makes them suitable for energy metering and precise current monitoring in industrial applications where measurement accuracy is critical.
    Q What current ratings are available in the CTY2 series?
    The CTY2 series is available in multiple current ratings to suit different application needs: 60A/5A (CTY2-30), 250A/5A (CTY2-65), 400A/5A (CTY2-80), and 630A/5A (CTY2-100). All models output a standardized 5A secondary current for compatibility with standard measurement instruments.
    Q What does the overload current specification ≥1.2% ln mean?
    The overload current rating of ≥1.2% ln indicates that the CTY2 series transformers can handle currents exceeding 120% of the rated primary current (ln) without significant loss of accuracy or risk of damage. This provides a safety margin for transient overcurrent conditions in the circuit.
    Q What are the key factors to consider when selecting a current transformer?
    When selecting a CT, consider the following factors: primary current rating (must match the circuit's operating current), accuracy class (for metering or protection), secondary output (5A or 1A depending on connected instruments), insulation voltage (to ensure safety between windings), physical dimensions (to fit the installation space), and overload capability to handle fault conditions reliably.