A Split-Core Current Transformer is a type of current sensing device with a unique separable core design. Its core can be opened and closed like a “clamp,” allowing it to be directly attached around an existing conductor without disconnecting the circuit. This enables non-invasive installation.
Unlike traditional current transformers (CTs) that require conductors to be threaded through a solid core (necessitating power shutdown and cable disassembly), split-core CTs can be clamped onto live cables without interrupting service. This design significantly enhances installation flexibility and safety.
How It Works？
Split-core CTs operate on the principle of electromagnetic induction:
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When a current-carrying conductor passes through the core (or is placed within its opening), the alternating magnetic field generated around the conductor induces magnetic flux in the core.
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The secondary winding wrapped around the core senses changes in magnetic flux and produces a proportional secondary current (typically standardized to 5A or 1A output).
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By measuring the secondary current, the primary current value can be accurately calculated.
Key Advantages：
Compared to solid-core CTs, split-core CTs offer distinct benefits:
| Advantage | Description |
|---|---|
| Live-line Installation | Can be installed on energized circuits without downtime or production loss. |
| Flexibility & Convenience | Ideal for retrofits or temporary monitoring; no need to replace cables or equipment. |
| Safety & Reliability | Reduces electrical hazards during installation, especially in high-voltage or critical power scenarios. |
| Wide Applicability | Suitable for power distribution systems, industrial equipment, Energy Management Systems (EMS), and smart grid monitoring. |
Typical Applications
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Energy Management & Monitoring
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Real-time monitoring of electrical loads in factories and buildings to support energy-saving initiatives.
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Power Distribution System Retrofits
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Upgrading existing distribution panels for current monitoring without rewiring.
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Fault Diagnosis & Prevention
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Detecting current imbalances, harmonics, or overloads to prevent potential failures.
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Renewable Energy Systems
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Monitoring output currents from solar PV arrays or wind turbines.
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Key Technical Parameters for Selection
Consider the following when selecting a split-core CT:
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Rated Primary Current: Choose based on maximum load current (e.g., 200A, 500A, 1000A).
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Accuracy Class: Common classes: 0.5, 1. Higher accuracy (e.g., 0.5) is required for energy audits.
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Core Opening Size: Must exceed the outer diameter of the cable or busbar being measured.
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Output Signal: Standard 5A/1A analog.
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Protection Rating: For outdoor use, select IP65 or higher for dust and water resistance.
Media Contact
Company Name: Acrel Co., Ltd.
Email: Send Email
Phone: +86 18701920413
Country: China
Website: https://www.acrel-electric.ph/
