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China Current Transformer CTYK Series - Reliable Suppliers & Factory for Power System Monitoring and Protection
Product Overview
A CT is driven by electromagnetic induction and has two windings: a secondary winding (many turns linked to safety or measurement devices) and a primary winding (few turns connected in series with the high-current circuit). The secondary winding, which is usually set at 5A or 1A for most industrial applications, receives a low current while the primary winding receives a high current. This proportionality, also known as the transformation ratio, allows for accurate current monitoring while shielding workers and equipment from potentially hazardous voltages.
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Robust Insulation
Maintains high voltage integrity between primary and secondary windings.
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High Linearity
Minimizes measurement error for reliable energy metering performance.
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High Precision
Ensures accurate current monitoring across all industrial applications.
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Important Safety Notice: When using a CT, the secondary winding should never be left open circuit. An open circuit may generate extremely high voltages, which could seriously damage electrical equipment and pose a safety hazard.
In conclusion, since they enable more precise current monitoring and greater fault prevention, current transformers are critical to ensuring the reliability, efficacy, and safety of modern electrical systems.
Technical Parameters
| Type | Specification | (mm) Outline Size | |||||
|---|---|---|---|---|---|---|---|
| c | A | B | C | D | M | ||
| CTYK-30 | 60A / 5A | 30 | 89 | 70 | 28 | 80 | c5*7 |
| CTYK-45 | 100A / 5A | 45 | 104 | 85 | 28 | 95 | c5*7 |
| CTYK-65 | 250A / 5A | 65 | 124 | 105 | 28 | 115 | c5*7 |
| CTYK-80 | 400A / 5A | 80 | — | 122 | 28 | 132 | c5*7 |
| CTYK-IOO | 630A / 5A | 100 | 162 | 142 | 28 | 152 | c5*7 |
| 🏅 Accuracy Grade: 1.0 | .2% ln | ||||||
Frequently Asked Questions (FAQ)
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 linked to measurement or safety devices. The high current in the primary induces a proportionally lower current in the secondary, enabling safe and accurate monitoring of large currents.
Q
What is the standard secondary output current for the CTYK series?
The CTYK series current transformers have a standard secondary output of 5A, which is the most common rating for industrial applications. This standardized output allows for easy integration with a wide range of measurement and protection devices.
Q
Why should the secondary winding of a CT never be left open circuit?
Leaving the secondary winding open circuit is extremely dangerous. Without a connected load, all the primary magnetizing current drives the core into saturation, generating dangerously high voltages across the secondary terminals. This can cause severe damage to the CT itself, connected equipment, and poses a serious risk of electric shock to personnel.
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What accuracy grade do the CTYK series current transformers offer?
The CTYK series current transformers are rated at Accuracy Grade 1.0, with a measurement accuracy of ±0.2% In. This level of precision makes them well-suited for energy metering, billing applications, and industrial monitoring systems where measurement accuracy is critical.
Q
Which CTYK model should I choose for a 400A application?
For a 400A application, the CTYK-80 model is the appropriate choice. It is rated at 400A/5A with a core aperture of 80mm, dimensions B=122mm, C=28mm, D=132mm, and uses M=c5*7 mounting slots, making it suitable for medium to large industrial current measurement needs.
Q
What are the key technical requirements for a current transformer to perform reliably?
A reliable current transformer must meet three essential technical requirements: robust insulation to safely maintain the high voltage difference between primary and secondary windings; sufficient linearity to minimize measurement errors across the operating range; and high precision to ensure accurate readings for energy metering and fault protection systems.