Facing the threat of large-scale outages on the island of Grand Cayman, Caribbean Utilities Company chose SEL to fix failing bay controllers at its main substation. SEL’s solution saved the utility millions of dollars.

Caribbean Utility Thwarts Island-Wide Power Blackouts

Caribbean Utility Thwarts Island-wide Power Blackouts

This paper examines several common bus configurations, presents appropriate protection schemes for each configuration, and analyzes the protection scheme complexity, advantages, and disadvantages.

Bus Protection Considerations for Various Bus Types

Aux premières lueurs de l’aube, par une chaude nuit de juin, un groupe d’ingénieurs se rassemble au Centre de contrôle national de Géorgie. D’une efficacité discrète, ils se préparent à lancer l’un des tests les plus importants que l’entreprise de transport d’électricité ait jamais réalisés : couper l’électricité sur l’une des principales lignes de transport de 500 kV.

Innovation, persévérance et un nouveau départ

Two drastically different types of differential relays, one with a single set of very high-impedance inputs and another with multiple sets of low-impedance inputs, are available for bus differential protection. This paper discusses for each type of relay the concepts used, the pros and cons, and the importance that current transformer selection plays in applications.

Considerations for Using High-Impedance or Low-Impedance Relays for Bus Differential Protection

This course is designed for utility and industrial protection engineers and power system consultants. Students in the APP 487B course explore implementation of station-wide, low-impedance current differential protection and integrated circuit breaker failure detection using the SEL-487B Bus Differential and Breaker Failure Relay. Single- and three-relay applications for both basic and complex busbar arrangements are covered. Backup overcurrent protection, event recording, automation, and time-synchronization capabilities are discussed. Students will work directly with the SEL-487B Relay, performing hands-on communications, settings, and testing.

APP 487B: SEL-487B Bus Differential and Breaker Failure Relay

Protection de jeu de barres

Les produits et systèmes de protection des jeux de barres assurent une protection primaire et une protection de secours complètes pour tous les types de défauts des jeux de barres et des appareillages de commutation.

Protection de jeu de barres

Relais de protection de jeu de barre

Relais de protection à maximum de courant

Éléments du système