Transmission Line Protection - Doing it Right

Hydro-Québec TransÉnergie (HQT) operates the most extensive transmission system in North America. To ensure correct operation of the protection system under many different abnormal conditions, HQT uses redundant sets of protective relaying schemes to improve reliability by increasing the availability of the protection system and follows the NPCC criteria to ensure that protection systems are designed to perform in accordance to high degree of dependability and security. More