Open Type Current Transformer for Efficient Power Measurement & System Retrofit

The Open Type Current Transformer (CT) developed by Jiangyin Yucheng Electric Co., Ltd. is a new-generation split-core current sensing device tailored for power system renovation, real-time current measurement and signal acquisition. Differing from traditional closed-core current transformers, this product adopts a unique open split structure combined with high-performance magnetic core materials and integrated sealing technology. It delivers convenient installation, stable operation and precise measurement, widely applicable to industrial power distribution, smart grid, electrical safety monitoring and other scenarios.

Electrical Performance and Technical Specifications

To satisfy diverse measurement, monitoring and protection demands in power systems, the Open Type Current Transformer is equipped with comprehensive and reliable technical parameters:

• Rated input: 10A ~ 6300A
• Rated output: 0–5A, 0–1A, 0–100mA or 4–20mA
• Accuracy: Ratio difference ≤ ±0.2%, Phase difference ≤ ±15 points
• Measuring range: 5%In ~ 150%In
• Working frequency: 50–60Hz
• Rated working voltage: AC 0.66kV
• Core materials: High-quality cold-rolled silicon steel or nanocrystalline alloy
• Shell material: Flame-retardant polycarbonate, fire rating UL94-V0
• Internal structure: Vacuum epoxy resin casting, fully sealed and moisture-proof
• Connection mode: Terminal connection, equipped with 1.5m shielded cable
• Mechanical durability: Opening and closing cycles ≥ 1000 times

These specifications endow the transformer with excellent linearity, low magnetic loss and outstanding anti-electromagnetic interference capability, ensuring long-term stable and accurate signal transmission for measurement, control and protection equipment.

Key Applications

The Open Type Current Transformer is versatile and perfectly suited for multiple power industry scenarios:

• Power distribution network renovation and live-line reconstruction projects
• Electrical fire monitoring and leakage current protection systems
• Current sampling for remote terminal units (RTU) and feeder terminal units (FTU)
• Electromagnetic relays and microcomputer comprehensive protection devices
• Industrial automation equipment and intelligent power monitoring systems
• Cable branch boxes, ring main units and compact switchgears
• Zero-sequence current detection for low-voltage and medium-voltage grounding systems

It is the preferred product for projects requiring non-power-cut installation, rapid construction and high measurement accuracy.

Structural and Installation Advantages

Split Open-core Design

The split open-core structure enables direct installation on existing cables or busbars without cutting off wires or interrupting power supply. It supports live-line operation, greatly shortening construction time and avoiding economic losses caused by power outages.

Premium Materials & High Stability

Adopting high-permeability magnetic core and vacuum epoxy casting technology, the product features low loss, anti-aging, moisture-proof and dust-proof performance. The flame-retardant shell enhances operational safety and extends service life.

Wide Measurement Adaptability

Covering an input current range from 10A to 6300A, a single model adapts to cables of different specifications, covering small branch circuits and main power lines to meet the matching demands of various power systems.

Compact Structure & Firm Mounting

The lightweight and compact body saves installation space. Equipped with stainless steel fasteners and positioning buckles, it can be firmly fixed on switch cabinets, cable trays and other positions to prevent loosening during long-term operation.

Installation & Maintenance

The installation process is simple and efficient with no complex wiring required:

1. Loosen the fixing screws to separate the two parts of the open-type CT.
2. Clamp the transformer onto the target cable or busbar, align the two core sections tightly.
3. Fasten the fixing screws to ensure a tight fit of the core joint.
4. Connect the secondary shielded cable to the corresponding monitoring or protection device.

Daily maintenance is minimal. Regularly inspect the tightness of fasteners and the integrity of wiring connections. No special debugging or maintenance is needed under normal operating conditions.

Choose our Open Type Current Transformer to realize efficient renovation, high-precision measurement and safe operation of power systems. Feel free to Contact us for detailed parameter sheets, professional installation guidance and personalized customization services.