Use of Directional Elements at the Utility-Industrial Interface

This paper reviews applicable standards and references, and describes the reasons for installing various protective elements at the utility-industrial interface. The paper also reviews the operating characteristics of reverse power, load encroachment, and directionally supervised phase overcurrent elements. Real-world event reports will be used to demonstrate problematic applications and common settings mistakes. Lastly, the paper will recommend proper application principles and settings. It is highly recommended to use microprocessor-based relays which offer enhanced directional element sensitivity for greater fault protection