Top-Class Current Transformers for Power Transformers

What Is a CT for Transformer?

A Current Transformer (CT) for transformers is a specialized device designed to measure and monitor electrical current in high-voltage power systems. It reduces large primary currents into manageable secondary values, making it possible for protective relays and metering devices to safely process data.

Key Functions and User Benefits

• Accurate Monitoring: Enables real-time current tracking with minimal error.
• Enhanced Protection: Helps protect transformers and switchgear from overloads and short circuits.
• Efficient Energy Management: Supports precise billing and load analysis.
• Safety Compliance: Reduces the risk of electrical hazards in high-voltage systems.

Technical Parameters of CTs for Transformers

Here are typical specs you should consider when selecting a CT for transformer applications:

• Rated Primary Current: 50A – 5000A
• Rated Secondary Current: 1A / 5A
• Accuracy Class: 0.2, 0.5, 1.0 (IEC/ANSI)
• Burden: 1.25 VA – 30 VA
• Frequency: 50Hz / 60Hz
• Insulation Level: Up to 36kV
• Mounting Options: Bar type, wound type, split-core

Common Issues Solved by Using CTs

Many transformer users struggle with:

• Inaccurate Metering: Leads to billing disputes and system inefficiencies.
• Overheating: Due to undetected overcurrent conditions.
• Operational Risks: Caused by lack of real-time monitoring or protection relay input.

Installing a reliable CT eliminates these problems, ensuring transformer health and system safety.

Applications and Installation Scenarios

CTs for transformers are widely used in:

• Power generation stations
• Transmission and distribution substations
• Industrial electrical systems
• Utility metering and protection panels

They can be installed directly on transformer bushings, inside control cabinets, or integrated into switchgear setups depending on the type and rating.

How to Choose the Right CT for Your Transformer

Consider the following factors when selecting a CT:

• Primary and Secondary Current Rating: Match with your load and measurement system.
• Accuracy Class: Choose based on whether it's for protection or metering.
• Physical Dimensions: Ensure proper fit with transformer or cabinet space.
• Installation Type: Select between bar, wound, or split-core depending on site conditions.

Why Choose Our CTs — Quality & Service Guarantee

Our CTs are manufactured under strict ISO standards and tested for long-term stability. Key advantages include:

• Precision Engineering: Low ratio and phase errors for accurate metering.
• Durability: Weatherproof, oil-resistant, and temperature-stable designs.
• Flexible Customization: Tailored voltage, current, and mounting options.
• Fast Global Delivery: With technical support from engineers with over 10 years’ experience.

Get a Free Quote or Technical Support

Need help choosing the right CT? Contact us today to get a personalized recommendation, datasheet, or free sample. Our team is ready to support your project with reliable current transformers built for high performance.