Open-Close AC Current Transformer

Providing with quality and standard customer-made electronic and passive components open-close ac current transformer and solution products, Fullstar Electronics is a leading open-close ac current transformer manufacturer and supplier in China. welcome to wholesale electronics open-close ac current transformer from our factory.

Open-close current transformer, also known as split-core current transformer or open-type current transformer, is a specialized electrical measurement device. It is primarily used for measuring current, sampling signals, and providing microcomputer protection in power systems.

1. Core Working Principle

2. Unique Structural Features

• Hinged Mechanism: The iron core is typically divided into two semi-circular halves connected by a hinge or latch mechanism.
• Non-intrusive Installation: This structure allows the core to be opened and clamped directly around an existing live conductor without needing to disconnect the circuit or cut off the power supply.
• Materials: The core is usually made of high-permeability silicon steel sheets to minimize magnetic path loss and ensure good linearity.

3. Key Advantages

• Convenient Installation & Retrofitting: It eliminates the need for power outages during installation, significantly reducing labor costs, downtime, and transformation difficulty. This makes it ideal for system upgrades and energy management retrofits.
• Compact & Lightweight: Its small size makes it suitable for space-constrained environments like compact ring main units, cable branch boxes, and complex industrial panels.
• Safety & Continuity: Because it can be installed on energized lines, it ensures continuous operation of critical electrical systems.

4. Limitations Compared to Solid-Core Transformers

• Slightly Lower Accuracy: Due to the mechanical joints, tiny air gaps are inevitably introduced into the magnetic path when the core is closed. These air gaps can cause slightly lower accuracy compared to solid-core transformers. However, high-quality products with precision clamping mechanisms can still achieve excellent accuracy (better than 0.5% or even 0.05 class).
• Strict Installation Requirements: Proper alignment and secure locking of the core halves are critical. Poor installation can exacerbate the air gap issue and degrade performance.

5. Typical Application Scenarios

• Power System Retrofits: Upgrading energy monitoring systems in factories, commercial buildings, and residential areas without disrupting normal operations.
• Smart Grids & IoT: Integration with Remote Terminal Units (RTUs) and Feeder Terminal Units (FTUs) for real-time grid monitoring.
• Temporary Testing & Maintenance: Portable testing equipment and fault troubleshooting where quick setup and teardown are required.
• Continuous Operations: Environments like electric vehicle testing facilities or data centers where shutting down the system is impractical.

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