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Current Transformer DSC Series - Reliable China Suppliers and Factory for High-Performance AC Measurement Solutions

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A current transformer (CT) is an essential electrical device that converts high alternating currents (AC) into lower, measurable values. This transformation enables safe monitoring, control, and protection of power systems. Commonly used in power generation, transmission, distribution, and various industrial applications, a CT serves as a crucial link between high-current power circuits and sensitive measuring instruments or protective relays. As a leading China supplier and factory of current transformers, we ensure high quality and reliability in our products, making them ideal for various applications in the energy sector.

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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.

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    High Accuracy

    Essential for energy metering, ensuring reliable and precise current measurement.

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    Strong Linearity

    Prevents measurement distortion across a wide range of operating conditions.

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    Insulation Strength

    Sustains high voltage between windings to protect personnel and equipment.

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    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 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 protective devices. When high current flows through the primary, a proportionally lower current is induced in the secondary, allowing safe and accurate measurement.
    Q What is the standard secondary current output for industrial CTs?
    For most industrial applications, the secondary winding of a CT is standardized to either 5A or 1A. This allows the secondary output to be safely connected to standard measuring instruments and protection relays regardless of the primary current level.
    Q What does the transformation ratio mean in a current transformer?
    The transformation ratio is the proportional relationship between the primary current and the secondary current. For example, a CT rated 400/5A means that a primary current of 400A will produce a secondary current of 5A. This ratio ensures accurate scaling of the measured current for metering and protection devices.
    Q Why should a CT's secondary winding never be left open-circuited?
    If the secondary winding of a CT is open-circuited while the primary carries current, the magnetic flux in the core will become unsaturated and generate an extremely high voltage across the secondary terminals. This can damage the CT, connected equipment, and pose a serious electrical hazard to personnel. Always ensure a load or short circuit is connected before energizing.
    Q What accuracy class does the DSC-30 current transformer support?
    The DSC-30 current transformer supports accuracy classes of 1.0 and 0.5, making it suitable for both general metering and higher-precision energy measurement applications. The rated burden ranges from 1.5 to 5 VA, accommodating a variety of connected instruments.
    Q What high voltage test standard does the DSC-30 comply with?
    The DSC-30 is tested at 4KVeff at 50Hz for 1 minute as part of its high voltage dielectric test. This ensures the insulation between the primary and secondary windings can withstand transient overvoltages encountered in real-world electrical installations, providing a high level of operational safety.