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

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In the realm of electrical equipment, a current transformer (CT) plays a crucial role in the safe monitoring, management, and protection of power systems. This indispensable device converts high alternating currents (AC) into lower, more manageable values, making it essential for various applications. Whether in power generation, transmission, distribution, or industrial settings, CTs serve as a vital link between high-current power circuits and sensitive measurement devices or protective relays. As a leading manufacturer in China, our factory specializes in producing high-quality current transformers that meet the demands of today’s power systems. Trust our reliable suppliers for your electrical needs and experience the benefits of enhanced safety and efficiency in your 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.

    🎯 High Accuracy
    Required for energy metering
    📐 Robust Linearity
    Prevents measurement distortion
    🛡️ Insulation Strength
    Maintains high voltage between windings
    ⚡

    Current transformers are essential to preserving the dependability, effectiveness, and safety of contemporary electrical systems — offering accurate current monitoring and efficient fault protection.

    ⚠️

    Important: A CT's secondary winding should never be open-circuited while in use. An open circuit could produce dangerously high voltages that may damage equipment or pose serious safety risks.

    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 Second Current: 0.5mA

    * Scroll horizontally on mobile to view full table.

    Frequently Asked Questions (FAQ)

    Q What is a current transformer (CT) and how does it work?
    A current transformer (CT) is an electrical device that measures high alternating currents by 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 large primary current to a proportionally lower, safer secondary current — typically standardized at 5A or 1A — for accurate measurement and monitoring.
    Q What is the transformation ratio in a CT, and why is it important?
    The transformation ratio is the proportional relationship between the primary current and the secondary current of a CT. It is a critical specification because it ensures accurate and consistent current measurement across different load conditions, enabling reliable energy metering and protective relay operation without exposing personnel or instruments to hazardous voltages.
    Q Why should the secondary winding of a CT never be left open-circuited?
    When the secondary winding of a CT is open-circuited while the primary is energized, the magnetic flux in the core is no longer balanced by a secondary current. This causes the core to saturate and generates dangerously high voltages across the secondary terminals — potentially thousands of volts — which can damage insulation, destroy connected equipment, and pose a serious safety hazard to personnel.
    Q What are the key performance features to look for in a current transformer?
    The three most important performance features in a CT are: High Accuracy — essential for precise energy metering and billing; Robust Linearity — ensures measurement output remains proportional across the full current range without distortion; and Insulation Strength — maintains safe electrical isolation between the high-voltage primary and the low-voltage secondary circuits.
    Q What current ranges are supported by the F-series CT models?
    The F-series CT models cover a wide range of main loop currents to suit various industrial applications. For example, the F-1435 supports currents below 250A, the F-2245 handles up to 630A, the F-2645 is rated for below 800A, the F-3445 supports up to 2000A, and the F-4045 is designed for currents below 2500A. Specific outline dimensions are provided for each model to assist with installation planning.
    Q What is the rated secondary current for these CT models?
    According to the technical parameters table, the rated secondary current for these F-series current transformer models is 0.5mA. This low secondary output is designed for compatibility with connected safety, measurement, or monitoring devices, ensuring safe and precise signal transmission in industrial electrical systems.