Product Overview
A CT uses electromagnetic induction and consists of two windings: a secondary winding with several turns connected to safety or measurement devices and a primary winding with a few turns connected in series to the high-current circuit. The secondary winding, which is typically tuned to 5A or 1A for the majority of industrial applications, receives very little current while the primary winding receives a substantial amount. This proportionality, sometimes referred to as the transformation ratio, protects personnel and equipment from potentially hazardous voltages while enabling precise current monitoring.
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High accuracy for energy metering, linearity to reduce measurement error, and sufficient insulation to sustain a high voltage between windings are all necessary for CTs.
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Important: The secondary winding should never be left open circuit while using a CT. An open circuit may produce extraordinarily high voltages that might damage electrical equipment.
Current transformers are essential to guaranteeing the dependability, effectiveness, and safety of contemporary electrical systems, as they allow for more accurate current monitoring and better problem diagnostics.
Frequently Asked Questions (FAQ)
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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 a high-current circuit and a secondary winding connected to measurement or protection devices. The primary current induces a proportional, much smaller current in the secondary winding, enabling safe and accurate current monitoring.
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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 carries current can generate dangerously high voltages across the secondary terminals. These voltages can damage the CT itself, 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 do these current transformers offer?
All models in this series — N22, N30, N45, and N65 — offer an accuracy grade of 1.0. This level of accuracy is suitable for energy metering and industrial measurement applications, ensuring minimal measurement error and reliable performance.
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What current ranges are available across the CT models?
The available models cover a wide range of current measurement needs: the N22 supports 0–100A, the N30 supports 0–250A, the N45 supports 0–500A, and the N65 supports 0–1000A. This makes it easy to select the right model based on your application's load requirements.
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What signal output types do these CTs support?
The N22 model outputs 0–100mA or 0.333V, while the N30, N45, and N65 models output 0–5A or 0.333V. These output options make the CTs compatible with a wide variety of measurement instruments, energy meters, and protection relays used in industrial settings.
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What is the overload current specification for these current transformers?
All models in this CT series are rated with an overload current of ≥1.2%ln. This ensures the transformers can handle temporary overcurrent conditions without compromising measurement accuracy or causing damage to the windings or insulation.
