Current Transformers (CTs) are fundamental to modern electrical systems, providing accurate current measurement and electrical isolation for protection and metering. The two most common designs — wound type current transformers and bar type current transformers — differ significantly in construction, accuracy behavior, and applications.
Key Differences Between Wound Type and Bar Type Current Transformers
Selection depends on system current, accuracy class, installation constraints, and burden requirements. Wound-type CTs offer flexible ratios for medium currents, while bar-type CTs excel in high-current, high-fault-level applications.
Send EnquiryWound Type Current Transformers: Construction & Operation
Wound-type CTs feature multi-turn primary windings wound around a laminated magnetic core. They deliver high accuracy and comply with IEC 61869-2 and IEEE C57.13 standards.
These CTs are ideal for feeder protection, metering panels, and medium-voltage switchgear where precise ratio selection and burden control are required.
Bar Type Current Transformers: Construction & Operation
Bar-type CTs use a rigid insulated bar as a single-turn primary conductor. This design ensures exceptional mechanical strength and short-circuit withstand capability.
They are widely used in substations, busbar systems, and high-current industrial power distribution networks.
How to Choose Between Wound Type and Bar Type CTs
Choose a wound-type CT for low to medium current measurement requiring high accuracy. Opt for a bar-type CT when handling high currents, limited space, and severe fault conditions.
Request a QuoteFAQ
What is a wound-type current transformer?
A wound-type CT has separate primary and secondary windings wound on a magnetic core, allowing precise ratio selection and high accuracy for metering and protection.
What is a bar-type current transformer?
A bar-type CT uses a solid bar as the primary conductor, making it robust and ideal for high-current and substation applications.
Which CT is better for high current?
Bar-type current transformers are better suited for high current and fault-level conditions due to their mechanical strength and stability.
Where are wound-type CTs commonly used?
Wound-type CTs are used in metering panels, feeder protection, and medium-voltage switchgear where accuracy is critical.
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