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China F2 Series Current Transformers - Reliable Suppliers & Factory for Efficient Power Monitoring and Protection

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Introducing our high-quality current transformer (CT), designed to efficiently convert high alternating currents (AC) into smaller, measurable values. This essential electrical equipment is vital for the safe monitoring, management, and protection of power systems across various sectors, including power generation, transmission, and distribution. Our CTs are an ideal solution for connecting sensitive measuring instruments and protective relays to high-current power circuits. As a leading China supplier and factory of current transformers, we ensure that our products meet the highest industry standards, providing reliability and performance for your industrial applications.

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    Product Details

    ⓘ Product Overview

    A CT is powered by electromagnetic induction and consists of a main winding (few turns, connected in series with the high-current circuit) and a secondary winding (many turns, coupled to safety or measurement devices). The primary winding receives a large current whereas the secondary winding, which is typically standardized to 5A or 1A for most industrial purposes, receives a proportionately low current. This proportionality, sometimes referred to as the transformation ratio, ensures accurate current measurement without exposing personnel or equipment to potentially dangerous voltages.

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    Important Notice: While using a CT, the secondary winding should never be open-circuited. An open circuit might result in dangerously high voltages that could seriously harm equipment and personnel.

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    High Precision Essential for accurate energy metering and monitoring applications.
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    Strong Linearity Prevents measurement distortion across a wide range of current levels.
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    Insulation Strength Maintains high voltage isolation between primary and secondary windings.

    In conclusion, because they provide precise current monitoring and excellent fault protection, current transformers are critical to maintaining the reliability, efficacy, and safety of modern electrical systems.

    ⚙ Technical Parameters
    Type Main Loop Current (mm) Outline Size
    F2-1025 — 162 71 28 155 100 25
    F2-1435 < 250A 202 — 28 195 140 35
    F2-1835 < 400A 242 82 28 235 180 35
    F2-2245 < 630A 282 92 28 275 220 45
    F2-3045 < 1250A 363 92 28 355 300 45
    Rated Primary Current: 1A Rated Secondary Current: 0.5mA
    📌 All outline dimensions are in millimeters (mm). Specifications are subject to change without prior notice.
    ❓ 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 a high-current circuit and a secondary winding coupled to measurement or protection devices. The large primary current is transformed into a proportionally smaller, safer secondary current for accurate measurement and monitoring.
    Q What are the standard secondary current ratings for industrial CTs?
    For most industrial applications, the secondary winding of a CT is standardized to either 5A or 1A. These standardized outputs make it easy to connect CTs to a wide range of measurement instruments and protection relays without modification.
    Q Why should the secondary winding of a CT never be left open-circuited?
    If the secondary winding is left open-circuited while the primary carries current, the CT will attempt to drive all the magnetizing flux through the core without a load to dissipate it. This results in dangerously high voltages across the secondary terminals, which can damage insulation, destroy equipment, and pose serious safety risks to personnel.
    Q What does the transformation ratio of a CT mean?
    The transformation ratio is the proportional relationship between the primary current and the secondary current of a CT. For example, a CT with a ratio of 1000:5 means that when 1000A flows through the primary winding, 5A flows through the secondary winding. This ratio ensures accurate, safe, and scalable current measurement for various applications.
    Q Which CT model is suitable for currents below 630A?
    Based on the technical parameters table, the F2-2245 model is rated for main loop currents below 630A, with an outline size of 282 × 92 × 28 mm (external dimensions) and a window size of 275 × 220 × 45 mm. It is a reliable choice for medium-range current measurement applications.
    Q What are the key performance characteristics to consider when selecting a CT?
    When selecting a current transformer, the three most important performance characteristics to evaluate are: High Precision — for accurate energy metering; Strong Linearity — to prevent measurement distortion across different load levels; and Insulation Strength — to ensure safe voltage isolation between the primary and secondary windings and protect both equipment and personnel.