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China F Series Current Transformer - Reliable Suppliers & Factory for Power System Monitoring and Protection

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For effective monitoring, management, and protection of power systems, a current transformer (CT) is a crucial electrical device that transforms high alternating currents (AC) into lower, measurable values. This equipment is indispensable in various applications, including power generation, transmission, and distribution, making it a preferred choice among China suppliers and factories. By serving as a vital link between high-current power circuits and sensitive measurement instruments or protective relays, current transformers enhance the safety and efficiency of industrial operations.

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    Product Details

    Product Overview

    A primary winding (few turns, connected in series with the high-current circuit) and a secondary winding (many turns, coupled to safety or measurement devices) make up a CT, which operates by electromagnetic induction. The secondary winding, which is usually standardized to 5A or 1A for the majority of industrial applications, receives a proportionally low current while the primary winding receives a big current. This proportionality, also known as the transformation ratio, guarantees precise current measurement without subjecting workers or equipment to potentially hazardous voltages.

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    Key Features: High accuracy (required for energy metering), robust linearity (to prevent measurement distortion), and insulation strength (to maintain high voltage between windings) are crucial features of CTs.

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    Important Safety Notice: A CT's secondary winding should never be open-circuited while in use. An open circuit could produce dangerously high voltages that could damage equipment.

    In conclusion, current transformers are essential to preserving the dependability, effectiveness, and safety of contemporary electrical systems since they offer accurate current monitoring and efficient fault protection.

    Technical Parameters
    Type Main Loop Current Outline Size (mm)
    F-1025   156 54 19   100 25
    F-1435 < 250A 204 71   188 140 35
    F-1835   246 71   230 180 35
    F-2245 < 630A 282 84   266 220 45
    F-2645 < 800A 327 86 24 311 260 45
    F-3045   366 86 24 351 300 45
    F-3445 < 2000A 426 86 24 410 340 45
    F-4045 < 2500A 486 86 24 470 400 45
    F-4545   517 86 24 502 450 45
    Rated Primary Current: IA Rated Secondary Current: 0.5mA
    Frequently Asked Questions (FAQ)
    ❓ What is a current transformer (CT) and how does it work?
    A current transformer (CT) works 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 induces a proportionally smaller current in the secondary winding, enabling safe and accurate measurement.
    ❓ What is the standard secondary output current for industrial CTs?
    For the majority of industrial applications, the secondary winding of a CT is standardized to either 5A or 1A. This standardization allows for compatibility with a wide range of measurement instruments and protection relays.
    ❓ Why should the secondary winding of a CT never be left open-circuited?
    Open-circuiting the secondary winding while the CT is energized can generate dangerously high voltages across the secondary terminals. This can cause insulation breakdown, damage to the transformer, and serious safety hazards to personnel. Always ensure the secondary is connected to a load or short-circuited before disconnecting any measuring device.
    ❓ What are the key performance features to look for in a current transformer?
    The three most critical features are: High Accuracy — essential for precise energy metering; Robust Linearity — prevents measurement distortion across the current range; and Insulation Strength — ensures safe electrical isolation between the primary high-voltage circuit and the secondary measurement circuit.
    ❓ What main loop current ranges do these CT models support?
    The CT models in this series support a wide range of main loop currents. For example, the F-1435 supports up to 250A, the F-2245 up to 630A, the F-2645 up to 800A, the F-3445 up to 2000A, and the F-4045 up to 2500A, making them suitable for various industrial and commercial power systems.
    ❓ What is the transformation ratio and why is it important?
    The transformation ratio is the relationship between the primary current and the secondary current in a CT. It ensures that a large and potentially dangerous primary current is accurately scaled down to a safe, measurable secondary current. Maintaining this precise proportionality is critical for reliable energy metering, system monitoring, and fault protection in modern electrical installations.