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YZ transformer .jpg

YZ Series Current Transformer - Reliable AC Measurement Solutions from China Suppliers and Factory

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A current transformer (CT) is an essential electrical device widely used in China for the safe monitoring, controlling, and protection of power systems. This device effectively transforms large alternating currents (AC) into smaller, measurable values, making it crucial for connecting high-current power circuits to protective relays and precise measuring equipment in various applications, including power generation, transmission, distribution, and industrial sectors. As a leading supplier and factory in the industry, we provide high-quality current transformers designed to meet your specific needs and ensure efficient operation in any electrical setup.

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    Product Details

    Product Overview

    A CT is powered by electromagnetic induction and consists of two windings: a secondary winding (many turns coupled to safety or measurement devices) and a main winding (few turns connected in series with the high-current circuit). While the secondary winding, which is typically specified at 5A or 1A for most industrial applications, receives a relatively low current, the primary winding receives a large current.

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    Transformation Ratio: The proportionality between primary and secondary windings ensures precise current measurement while protecting personnel and equipment from potentially harmful voltages.

    CTs must have high accuracy (for energy metering), strong linearity (to reduce measurement error), and insulation strength (to maintain high voltage between windings).

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    Important Warning: The secondary winding should never be open-circuited while utilizing a CT. An open circuit may produce extremely high voltages, which can damage electrical devices.

    To conclude, current transformers are essential for guaranteeing the reliability, effectiveness, and safety of contemporary electrical systems because they enable precise current monitoring and improved fault protection.

    Technical Parameters

    Type Main Loop Current (mm) Outline Size
    A B D C E F G
    YZ-45 — 45 102 87 37 36 77.5 18
    YZ-65 < 250A 65 126 109 37 36 100.5 18
    YZ-80 — 80 146 129 37 36 121 18
    YZ-100 < 630A 100 158 144 37 36 133 18
    Rated Primary Current: IA Rated Secondary Current: 0.5mA

    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 measuring or protection devices. The large primary current induces a proportionally smaller secondary current, enabling safe and accurate measurement.
    Q What are the standard secondary current ratings for CTs used in industrial applications?
    For most industrial applications, the secondary winding of a CT is typically specified at either 5A or 1A. These standardized output values allow the secondary current to be safely measured by connected instruments and protection relays.
    Q Why should the secondary winding of a CT never be left open-circuited?
    When the secondary winding is open-circuited during operation, all the primary magnetomotive force is used to drive the core into deep saturation. This can generate extremely high voltages across the secondary terminals, posing a serious risk of damage to connected equipment and potential danger to personnel.
    Q What are the key performance requirements for a high-quality Current Transformer?
    A high-quality CT must meet three primary performance requirements: high accuracy for precise energy metering, strong linearity to minimize measurement error across the full operating range, and sufficient insulation strength to safely maintain high voltage isolation between the primary and secondary windings.
    Q What main loop current ratings are supported by the YZ series CTs?
    The YZ series supports a range of main loop current ratings. The YZ-65 model supports currents below 250A, while the YZ-100 model supports currents up to 630A. Different models (YZ-45, YZ-65, YZ-80, YZ-100) are available to match various application requirements.
    Q How do I select the correct CT model based on outline dimensions?
    Selection should be based on the required main loop current capacity and the available installation space. Refer to the Technical Parameters table for the full outline dimensions (in mm) of each model — YZ-45, YZ-65, YZ-80, and YZ-100 — to ensure the unit fits correctly within your panel or enclosure. The rated secondary current for all models is 0.5mA.