Login SEL-321-5 TOGGLE DROPDOWN CONFIGURE SEL-321-5 Phase and Ground Distance Relay The SEL-321-5 Relay is designed especially for EHV and HV applications on 50 Hz systems. The relay provides enhanced single-pole tripping, phase and ground distance, directional overcurrent, negative-sequence overcurrent, and fault locating. The SEL-321-5 Relay contains all the protective elements and control logic necessary to protect, monitor, and control overhead lines. STARTING AT $5,600 USD CONFIGURE Contact Us 50 Hz EHV and HV applications. Designed to meet stringent single-pole tripping requirements. Contains all the protective elements and control logic necessary to protect, monitor, and control any noncompensated overhead line. The unique adaptive directional element chooses between negative- and zero sequence quantities based on signals generated by a disturbance. Power-swing blocking is provided during the single-pole-open period immediately following a single-pole trip. MORE Related Materials Details OVERVIEW Four zones of phase and ground distance protection. Quadrilateral (and/or mho) characteristic for ground distance protection. Adaptable directional element selects best measurement technique (negative-sequence or zero-sequence impedance). Independent timers for phase and ground distance time-delayed trips. Any zone may be set forward or reverse. Patented Mirrored Bits technology for communications-aided tripping schemes (eight independent channels in each relay). Flexible communications and RTU features including three independent ports; ASCII, multidrop, and binary protocols; compressed ASCII commands; Fast Meter/Fast Operate support; Remote control bits for SCADA/RTU functions. Product Certifications Discover Customer Highlights Solutions Technologies Products Product Catalogs SEL Video Financing About About SEL Careers Company Store Support Customer Service Technical Support Education Product Feature Comparisons FAQ Warranty Terms and Conditions Certifications Corporate Headquarters 2350 NE Hopkins Court Pullman, WA 99163 - USA Phone: +1.509.332.1890 Fax: +1.509.332.7990 © 2021 - Schweitzer Engineering Laboratories, Inc. Privacy Policy Cookie Policy Sitemap By continuing to browse or by clicking “Accept All Cookies,” you agree to the storing of first- and third-party cookies on your device to enhance site navigation and analyze site usage for an improved user experience. View our Cookie Policy ACCEPT ALL COOKIES