Product Overview
A CT employs electromagnetic induction and consists of two windings: a main winding with a few turns linked in series to a high-current circuit and a secondary winding with several turns connected to safety or measurement devices. The secondary winding, which is normally tuned to 5A or 1A for the bulk of industrial applications, receives very little current, whereas the main winding receives a lot. This proportionality, also known as the transformation ratio, protects people and equipment from unsafe voltages while allowing for accurate current monitoring.
⚡ Electromagnetic Induction
🔒 High Voltage Insulation
🎯 High Precision Metering
📐 Transformation Ratio
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Important: When using a CT, the secondary winding should never be left open circuit. An open circuit has the potential to produce extremely high voltages that might damage electrical equipment.
CTs require high precision for energy metering, linearity to minimize measurement error, and enough insulation to sustain a high voltage between windings. Since they enable more precise current monitoring and problem diagnosis, current transformers are essential to the reliability, efficiency, and safety of modern electrical systems.
Frequently Asked Questions
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What is the working principle of a Current Transformer (CT)?
A 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 protection devices. The current in the secondary winding is proportional to the primary current, defined by the transformation ratio, allowing safe and accurate current measurement.
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Why should the secondary winding of a CT never be left open circuit?
Leaving the secondary winding open circuit while the primary is energized can generate extremely high voltages across the secondary terminals. This can damage insulation, destroy connected equipment, and pose a serious safety hazard to personnel. Always ensure the secondary is connected to a load or short-circuited when not in use.
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What accuracy grade does the CTY2 series support?
The CTY2 series current transformers support an accuracy grade of 1.0, which meets the requirements for energy metering and industrial measurement applications. This grade ensures minimal measurement error and high linearity across the rated current range.
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What is the standard secondary output current for the CTY2 series?
The CTY2 series current transformers are rated with a standard secondary output current of 5A. This is the most common secondary rating used in industrial applications, compatible with standard protection relays, energy meters, and monitoring instruments.
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What overload current capacity does the CTY2 series provide?
The CTY2 series is designed to handle an overload current of ≥1.2% ln (rated current). This ensures reliable performance under transient overload conditions without compromising measurement accuracy or causing damage to the transformer windings.
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How do I select the correct CTY2 model for my application?
Selecting the correct CTY2 model depends on the primary current rating of your circuit and the physical dimensions required for installation. For example, CTY2-30 is suitable for 60A/5A applications with a 30mm window size, while CTY2-100 supports up to 630A/5A with a 100mm window. Always verify the outline dimensions (A, B, C, D, M) against your panel or busbar specifications before ordering.
