Current Transformer

Current transformers (CTs) play a crucial role in electrical power systems, providing accurate measurements and isolation. Their primary function is to convert high current levels into lower, manageable values, which can then be used for monitoring, control, and protection purposes. By considering the final application and purpose, several types of current transformers are available, each designed with specific features to meet varying needs.

Purpose and Application

The core purpose of current transformers is to convert the input current value into a proportional signal. This transformation is essential for various applications, as the accuracy of the measurement is critical to the system's overall performance. Typically, the primary current flows through the transformer's primary winding, while the secondary winding connects to a burden resistance to produce a voltage signal reflective of the measured current. This setup ensures that the information about the current is accurately captured and transmitted.

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Current transformers can be categorized based on their application and operational frequency. Below are the three primary types of current transformers, each serving distinct purposes:

Mains Frequency Current Transformers: These are designed to operate at standard power frequencies (50/60 Hz). They are commonly used in utility and industrial power systems to monitor and measure electrical parameters. Their robust construction and high accuracy make them ideal for applications where precise current measurement is critical for system performance and safety.

Current Transformers for Measurement Purposes: These CTs are specialized for applications requiring high precision in current measurement. They are used in protective relays, metering systems, and other devices that necessitate accurate current data for operational efficiency and safety. Their design focuses on minimizing measurement errors and ensuring reliable performance over a wide range of operating conditions.

Current Transformers for High-Frequency Applications: These transformers are tailored for high-frequency applications, such as inverters and power supplies operating at frequencies beyond the standard power range. They are designed to handle the unique challenges of high-frequency environments, including minimizing losses and maintaining accuracy despite the rapid changes in current.

Current transformers exhibit several key features that define their performance and suitability for various applications:

Accuracy: The accuracy of a CT is paramount, particularly in measurement and protection applications. It ensures that the secondary current is a precise representation of the primary current, enabling accurate monitoring and control.

Burden Resistance: The secondary winding of a CT is connected to a burden resistance, which converts the current signal into a voltage signal. The value of the burden resistance is critical to maintaining accuracy and ensuring the CT operates within its specified range.

Isolation: CTs provide galvanic isolation between the high current primary circuit and the measuring instruments, enhancing safety and protecting sensitive equipment.

Frequency Response: Depending on the application, CTs are designed to operate efficiently at different frequency ranges. High-frequency CTs, for example, are optimized to minimize losses and maintain accuracy in fast-changing current environments.

Construction and Durability: CTs must be constructed to withstand the mechanical and electrical stresses of their operating environments. This includes robust insulation, high-quality materials, and precise manufacturing processes to ensure longevity and reliability.

Custom Solutions: Given the diverse needs of various applications, standard CTs may not always meet specific requirements. Our company specializes in developing customized current transformers that align perfectly with client specifications. This involves tailoring aspects such as core material, winding configuration, and housing design to achieve the desired performance characteristics.

Automation and Quality Assurance: The production of high-quality CTs requires advanced automation and rigorous quality control. From the winding process to final assembly and testing, each step is meticulously monitored to ensure consistency and reliability. Vacuum casting and automated inspection processes further enhance the durability and performance of our transformers.

Innovation and Technology: Our commitment to continuous improvement drives our innovation in CT technology. By integrating cutting-edge materials and manufacturing techniques, we ensure that our transformers meet the highest standards of efficiency and accuracy. Our technical staff's expertise and dedication play a crucial role in pushing the technological boundaries of our products.
Current transformers are indispensable components in modern electrical systems, offering precise current measurement, isolation, and safety. With various types available, including mains frequency, measurement-specific, and high-frequency CTs, it is crucial to select the appropriate transformer for each application. Our advanced development and production capabilities ensure that we provide high-quality, customized solutions that meet the specific needs of our clients.
For more information or to make an enquiry, contact us today. We are here to help you find the ideal current transformer for your needs, ensuring exceptional performance and reliability. Optimize your electrical systems with our cutting-edge solutions.