China Y2 Series Current Transformer - Reliable Suppliers & Factory for Power Monitoring Solutions
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 normally defined at 5A or 1A for most industrial applications, receives a low current, whereas the primary winding receives a high current. This proportionality, also known as the transformation ratio, provides accurate current measurement while shielding workers and equipment from potentially hazardous voltages.
CTs require high precision (for energy metering), good linearity (to decrease measurement error), and insulation strength (to maintain high voltage between windings). To summarize, current transformers are critical for ensuring the dependability, efficacy, and safety of modern electrical systems because they allow more accurate current monitoring and enhanced fault protection.
Important Safety Notice: The secondary winding should never be open-circuited while using a CT. An open circuit may generate extraordinarily high voltages that can harm electrical devices and pose serious safety risks.
Technical Parameters
| Type | Main Loop Current | Outline Size (mm) | ||||
|---|---|---|---|---|---|---|
| Y2-30 | < 63A | 30 | 89 | 70 | 28 | 80 |
| Y2-45 | — | 45 | — | 85 | 28 | 95 |
| Y2-65 | < 250A | 65 | 124 | 105 | 28 | 115 |
| Y2-80 | — | 80 | 142 | 122 | 28 | 132 |
| Y2-100 | < 630A | 100 | 162 | 142 | 28 | 152 |
| Rated Primary Current: IA | Rated Secondary Current: 0.5mA | |||||
Frequently Asked Questions
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 protection devices. The CT steps down the high primary current to a safe, measurable secondary current (typically 1A or 5A) proportional to the original, enabling accurate monitoring without direct exposure to high voltages.
Why should the secondary winding of a CT never be left open-circuited?
If the secondary winding is open-circuited while the primary carries current, all the magnetomotive force drives the core into deep saturation. This generates extremely high and dangerous voltages across the secondary terminals, which can damage connected equipment, degrade insulation, and pose a serious risk of electric shock or fire. Always ensure the secondary is connected to a load or short-circuited before disconnecting any metering device.
What does the transformation ratio of a CT mean?
The transformation ratio is the fixed proportional relationship between the primary current and the secondary current. For example, a CT with a ratio of 100:5 means that when 100A flows through the primary, 5A flows in the secondary. This ratio allows accurate current measurement across a wide range of primary currents while keeping secondary output at safe, instrument-compatible levels.
What are the key performance requirements for a CT used in energy metering?
For energy metering applications, a CT must offer high precision (low ratio and phase errors), excellent linearity across the full operating current range to minimize measurement error, and strong insulation strength to safely isolate the high-voltage primary circuit from the low-voltage secondary measurement circuit. These characteristics ensure reliable billing-grade accuracy and long-term operational safety.
Which Y2 series CT model is suitable for currents up to 630A?
The Y2-100 model is designed for main loop currents up to 630A. It features an outline size of 100mm and overall dimensions of 162 × 142 × 28 × 152 mm, making it the largest model in the Y2 series and suitable for high-current industrial applications.
What is the rated secondary current for the Y2 series current transformers?
The Y2 series current transformers have a rated secondary current of 0.5mA. This low secondary output is optimized for use with sensitive measurement and protection instruments, ensuring compatibility with modern digital metering and monitoring systems while maintaining safe operating conditions.