Those standards are: 1) IEEE 1159 Recommended Practice for Monitoring Electric Power Quality, 2) IEEE 519 IEEE Recommended Practices and Requirements for Harmonic Control in Electrical Power Systems, 3) ITIC (CBEMA) Curve, 4) IEC 1000-4-7 General Guide On Harmonics And. Those standards are: 1) IEEE 1159 Recommended Practice for Monitoring Electric Power Quality, 2) IEEE 519 IEEE Recommended Practices and Requirements for Harmonic Control in Electrical Power Systems, 3) ITIC (CBEMA) Curve, 4) IEC 1000-4-7 General Guide On Harmonics And. Andrea Bonetti of Megger actively represents Sweden on the committee and together with three other delegates graciously agreed to provide information about this important work. Electrical systems are becoming more and more complex and sophisticated. As a consequence, protection systems are also. Testing relays is a critical part of ensuring the safety and reliability of electrical systems. To maintain high standards, engineers worldwide refer to the IEC standard for relay testing. This standard provides a uniform guideline that helps improve testing accuracy, equipment protection, and. The new generation of intelligent substations has achieved online monitoring functions for secondary equipment, making some state variables of relay protection equipment become observable indicators. They are intended to quickly identify a fault and isolate it so the balance of the system continue to run under normal conditions.