What are the CT classes?
Current Transformer Classes (CTS) classify their accuracy and performance characteristics according to international standards. Common CT classes include Class 0.1, Class 0.2, Class 0.5, Class 1.0, Class 3.0, and Protection (PR). These classes define the maximum error limits allowed under specified operating conditions, such as primary, load, and load current conditions.
CT Class 0.2 and Class 0.2 S are precision accuracy classes defined by international standards such as IEC 61869. CTS 0.2 CTS is designed for applications requiring very high precision, typically used in laboratory testing, l Precision instrumentation and revenue counting applications. Class 0.2 CTS has a maximum allowable error of ±0.2% under specified conditions. Class 0.2 S CTs are similar but are specified for use in special applications such as revenue measurement with specified transient performance requirements.
PR Class CTS, or Protection Class CTS, is designed for use in protective relay applications, where accurate and reliable current measurements are essential for the proper operation of protective relays. The PR CTS class is characterized by their ability to accurately reproduce the waveform of fault currents, withstand high overload currents without saturation and provide accurate current measurements within defined accuracy limits under operating conditions. default. Common PR class ratings include PR5, PR10, PR15, PR20, and PR, with each class representing different levels of accuracy and performance.
CT class and load are closely related parameters that influence the accuracy and performance of today’s transformers. The CT class specifies the accuracy limits of the CT under specified operating conditions, while the burden refers to the impedance presented to the secondary winding of the CT by connected devices, such as relays, meters or protective devices. Load affects the accuracy and saturation characteristics of the CT, and CTs are typically selected based on their compatibility with the specified load requirements of the connected equipment. Matching CT class and burden ensures accurate current measurements and reliable operation of protective devices in electrical power systems.
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