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Current Transformers (CT) - Reliable China Suppliers & Factory for Power Monitoring Solutions

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A current transformer (CT) is an essential electrical device used to convert high alternating currents (AC) into lower, measurable values. This transformation is crucial for the safe monitoring, control, and protection of power systems. Current transformers are extensively employed across various sectors, including power generation, transmission, and distribution, as well as in industrial applications. They serve as a vital link between high-current power circuits and sensitive measuring instruments or protective relays. As a leading supplier in China, our factory produces high-quality current transformers that meet international standards, ensuring reliability and precision in all power systems.

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    Product Details

    ⚡ Product Overview

    A CT, which works on the basis of electromagnetic induction, is made up of a secondary winding (many turns, connected to protective or measuring devices) and a primary winding (few turns, connected in series with the high-current circuit). The secondary winding, which is usually standardized to 5A or 1A for most industrial uses, experiences a proportionately low current when high current passes through the primary winding. This proportionality, known as the transformation ratio, guarantees precise current measurement without subjecting personnel or equipment to hazardously high voltages.

    High accuracy (essential for energy metering), strong linearity (to prevent measurement distortion), and insulation strength (to sustain high voltage between windings) are important features of CTs.

    ⚠ Important Safety Notice: A CT's secondary winding must never be open-circuited while it is operating. An open circuit can produce extremely high voltages, which could damage equipment or pose a serious safety risk.

    In conclusion, current transformers are essential for preserving the dependability, efficiency, and safety of contemporary electrical systems because they enable accurate current monitoring and efficient fault protection.

    📊 Technical Parameters
    Type Rated Current (A) Secondary Current Rated Burden (VA) Class Rated Voltage (V) Rated Frequency (Hz) High Voltage Test Security Factor
    DSC-30 50/5A – 400/5A   1.5 – 5 1.0 – 0.5 720 50/60 4KVeff, 50Hz, 1min FS < 5
    ❓ Frequently Asked Questions
    Q What is the working principle of a current transformer (CT)?
    A current transformer 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 protective devices. When high current flows through the primary winding, a proportionately reduced current is induced in the secondary winding, enabling safe and accurate measurement.
    Q What are the standard secondary current ratings for CTs?
    For most industrial applications, the secondary winding of a current transformer is standardized to either 5A or 1A. This standardization allows compatibility with a wide range of measuring and protective instruments used in electrical systems.
    Q Why should the secondary winding of a CT never be left open-circuited?
    If the secondary winding is open-circuited while the CT is energized, the magnetic flux in the core becomes unbalanced and can generate extremely high voltages across the secondary terminals. This poses a serious risk of equipment damage and personal injury. The secondary winding must always be connected to a load or short-circuited when not in use.
    Q What does the DSC-30 model's rated current range cover?
    The DSC-30 current transformer covers a rated current range of 50/5A to 400/5A, making it suitable for a variety of medium-range industrial current measurement applications. It supports both 50Hz and 60Hz operating frequencies.
    Q What is the significance of the accuracy class in current transformers?
    The accuracy class (e.g., 0.5 or 1.0 for the DSC-30) defines the maximum permissible percentage error in current measurement. A class 0.5 CT is more precise and is typically used for energy metering, while a class 1.0 CT is suitable for general industrial measurement and protection purposes.
    Q What does the Security Factor (FS) indicate in CT specifications?
    The Security Factor (FS) indicates the ratio of the instrument limit primary current to the rated primary current. An FS value of less than 5 (as specified for the DSC-30) means the CT will saturate at relatively low overcurrents, protecting connected measuring instruments from damage during fault conditions or overloads.