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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 isolation between primary and secondary windings.
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High Linearity
Minimizes measurement error for reliable current monitoring.
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High Precision
Designed for accurate energy metering in 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 | ||||||
* All dimensions are in millimeters (mm). Specifications subject to change without notice.
Frequently Asked Questions (FAQ)
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What is the standard secondary output current for the CTYK series current transformers?
The CTYK series current transformers have a standard secondary output current of 5A, which is suitable for most industrial measurement and protection applications. This allows safe interfacing with standard metering and relay equipment.
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Why should the secondary winding of a current transformer never be left open circuit?
If the secondary winding is left open circuit while the primary is energized, the transformer core becomes saturated and generates dangerously high voltages across the secondary terminals. This can damage insulation, destroy connected equipment, and pose a serious risk to personnel. Always ensure the secondary is connected to a burden or short-circuited before disconnecting any metering device.
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What accuracy grade do the CTYK series current transformers meet?
The CTYK series current transformers are rated at Accuracy Grade 1.0, with a measurement error of ±0.2%In. This level of accuracy makes them suitable for revenue-grade energy metering and precision industrial monitoring applications.
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How do I select the right CTYK model for my application?
Select the model based on your primary circuit's rated current. For example, use CTYK-30 for circuits up to 60A, CTYK-45 for up to 100A, CTYK-65 for up to 250A, CTYK-80 for up to 400A, and CTYK-IOO for up to 630A. Also verify the physical outline dimensions match your installation space requirements.
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What is the transformation ratio and why does it matter?
The transformation ratio is the proportional relationship between the primary (high) current and the secondary (low) current — for example, 250A/5A for the CTYK-65. This ratio allows measuring instruments and protection relays to safely and accurately monitor high currents without direct exposure to hazardous voltages or high-current circuits.
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What type of insulation is used in the CTYK series to ensure safety?
The CTYK series current transformers feature robust insulation designed to maintain high voltage isolation between the primary and secondary windings. This protects both connected measurement devices and operating personnel from potentially hazardous voltages present in high-current circuits.