What is IEC 60044-8 Ed.2 2018?

IEC 60044-8 Ed.2 2018 is a technical standard that specifies the requirements for current transformers used in measuring instruments and protective relays in electrical power systems. This standard provides guidelines for the design, performance, and testing of current transformers to ensure accurate measurement and reliable operation.

Design and Construction

The design and construction of current transformers play a crucial role in their performance and accuracy. According to IEC 60044-8 Ed.2 2018, current transformers should be designed to minimize errors and have sufficient insulation to withstand high voltages. The cores of these transformers are typically made of high-permeability materials, such as laminated iron or ferrite, to achieve high magnetic flux density. The windings on the core are carefully constructed to ensure proper turns ratio, which enables precise measurement of primary current.

Performance Requirements

IEC 60044-8 Ed.2 2018 defines specific performance requirements for current transformers. These include accuracy class, rated burden, thermal performance, and frequency response. Accuracy class indicates the maximum permissible error at different load conditions. Rated burden specifies the maximum load that can be connected to the secondary winding without affecting accuracy. Thermal performance ensures that the current transformer can operate within acceptable temperature limits. Frequency response describes the ability of the current transformer to accurately measure currents at different frequencies.

Testing and Certification

In order to comply with IEC 60044-8 Ed.2 2018, current transformers must undergo various tests to validate their performance. These tests include accuracy testing, verification of deviation under different burdens, and temperature rise tests. Testing laboratories use specialized equipment to measure the performance of current transformers and verify their compliance with the standard. Once a current transformer meets all the requirements, it can be certified and labeled accordingly, indicating that it has been tested and approved for use in electrical power systems.