Detailed operating instructions including installation, testing, SEL-221H Phase Distance Relay Ground Directional Overcurrent Relay Fault Locator. View and Download Schweitzer Engineering Laboratories SEL-221F instruction manual online. PHASE AND GROUND DISTANCE RELAY; GROUND DIRECTIONAL OVERCURRENT Date Code 20150130. Instruction Manual. SEL-787 Relay. Table of Contents. Appendix C: SEL Communications Processors. SEL Communications Protocols. The SEL-221F instruction manual is written for fault locations in terms of miles. This instruction manual applies to SEL-221F and SEL-221F-1 relays. Instruction Manual. 20151105. SEL-587-0, -1 Relay. Current Differential Relay. Overcurrent Relay. Instruction Manual. *PM587-01-NB* 1 Mau , and Sel . 221 . If a master becomes a bankrupt , in consequence of which the year's service is dispensed with , the servant nevertheless does notDate Code 20130726. Instruction Manual. SEL-710 Relay. Table of Contents. Appendix C: SEL Communications Processors. SEL Communications Protocols. The SEL-221F and SEL-121F Relays are designed to protect transmission, MTA setting determines fault direction (See Figure 2.2 of the Instruction Manual). Manuals and User Guides for Schweitzer Engineering Laboratories SEL-221F. We have 1 Schweitzer Engineering Laboratories SEL-221F manual available for free PDF SEL-221F and SEL-121F Phase and Ground Distance Relay, Directional Ground Relay, Synchronism Checking Relay, Reclosing Relay, Fault Locator. Manual ID:.