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DP Series Current Transformer from China Suppliers - Reliable Factory Solutions for Power Management and Protection

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Discover the essential role of current transformers (CTs) in managing and safeguarding electrical power systems. Our factory in China specializes in manufacturing high-quality CTs that produce small, manageable outputs from large alternating currents (AC). These devices are critical in power generation, transmission, and distribution, ensuring reliable connections in high-current power circuits alongside safety relays and precise measurement instruments. Partner with trusted suppliers from China for your current transformer needs to enhance the efficiency and safety of your industrial applications.

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    Product Details

    ⓘ Product Overview

    A CT employs electromagnetic induction and is made up of two windings: a secondary winding with many turns linked to safety or measurement devices, and a main winding with a few turns connected in series to a high-current circuit. The secondary winding, which is commonly set to 5A or 1A for the bulk of industrial applications, receives very little current, whereas the primary winding receives a lot. This proportionality, also known as the transformation ratio, safeguards individuals and equipment from potentially hazardous voltages while allowing for accurate current monitoring.

    ⚠️ The secondary winding should never be left open circuit while utilizing a CT. An open circuit may generate extremely high voltages, potentially damaging electrical equipment.

    CTs require high precision for energy metering, linearity to decrease measurement error, and enough insulation to support a high voltage between windings. Finally, since they enable more precise current monitoring and improved issue diagnostics, current transformers are critical to ensuring the reliability, efficacy, and safety of modern electrical systems.

    ⚙ Technical Parameters
    Type Specification (mm) Outline Size
    A B C D E
    DP-23 100–400A / 5A 112 90.5 59.5 32 22
    DP-46 250–1000A / 5A 141 114 55 62 42
    DP-58 250–1500A / 5A 163.5 123 59.5 82 51.5
    DP-88 250–1500A / 5A 162 144 55.5 82 82
    DP-510 500–3000A / 5A 191 142 67 102 52
    DP-812 500–3000A / 5A 203 151 59.5 122 82
    DP-614 1000–5000A / 5A 230 162.5 70.5 142 63
    DP-816 1000–6000A / 5A 250 183 71.5 162 82
    DP-820 3000–10000A / 5A 303 183 71.5 205 82
    ✅ Accuracy Grade: 1.0 ✅ Overload Current: ≥ 1.2% ln
    ? Frequently Asked Questions
    Q What is a Current Transformer (CT) and how does it work?
    A Current Transformer (CT) uses electromagnetic induction to measure high currents safely. It consists of a primary winding connected in series with a high-current circuit and a secondary winding linked to measurement or protection devices. The secondary winding outputs a proportionally reduced current — typically 5A or 1A — making it safe and practical for metering and monitoring equipment.
    Q Why should the secondary winding of a CT never be left open circuit?
    Leaving the secondary winding open circuit while the CT is energized can cause extremely high voltages to develop across the secondary terminals. This can result in insulation breakdown, equipment damage, or even a safety hazard to personnel. Always ensure the secondary circuit is closed or properly short-circuited before disconnecting any connected devices.
    Q What accuracy grade do these current transformers support?
    The current transformers in the DP series are rated at Accuracy Grade 1.0, which means the measurement error is within ±1%. This level of accuracy is suitable for energy metering and general industrial measurement applications, ensuring reliable and precise current monitoring.
    Q What is the transformation ratio, and which models are available?
    The transformation ratio refers to the relationship between the primary (input) current and the secondary (output) current. All DP series models output 5A on the secondary side. Available models cover a wide range of primary currents — from 100A (DP-23) up to 10,000A (DP-820) — making them suitable for a broad range of industrial and commercial electrical systems.
    Q What does the overload current specification ≥1.2% ln mean?
    The overload current rating of ≥1.2% ln indicates that the CT can handle currents at least 1.2 times its rated primary current (ln) without significant degradation in accuracy or risk of damage. This ensures the transformer remains operational and reliable during temporary overload conditions in the electrical system.
    Q How do I select the right DP series current transformer model for my application?
    Selecting the correct model depends primarily on the maximum primary current in your circuit and the physical space available for installation. Refer to the Technical Parameters table above to match your current range (e.g., 100–400A for DP-23, or 3000–10000A for DP-820) and check the outline dimensions (A through E) to ensure the unit fits your installation requirements.