selprotopy is intended to be used as a protocol binding suite for the SEL Protocol suite which includes SEL Fast Meter, SEL Fast Message, and SEL Fast Operate; each of which are proprietary protocols designed by Schweitzer Engineering Laboratories for use primarily with protective. selprotopy is intended to be used as a protocol binding suite for the SEL Protocol suite which includes SEL Fast Meter, SEL Fast Message, and SEL Fast Operate; each of which are proprietary protocols designed by Schweitzer Engineering Laboratories for use primarily with protective. The SEL-751 is the right solution for industrial and utility feeder protection, with conventional/low-energy analog (LEA) current and voltage input support, flexible I/O options, easy mounting, and fast settings. The SEL-751 provides complete protection for radial and looped distribution circuits. SEL products are designed and manufactured for the world's most challenging environments, exceeding all industry standards for. From protective relays, we can collect COMTRADE or Compressed Event (. Most IEDs provide software that is used to collect and analyze. GoPLC implements the SEL Fast Message and SEL ASCII protocols for communicating with Schweitzer Engineering Laboratories protective relays. Three roles are supported: SEL-311, SEL-351, SEL-387, SEL-421, SEL-451, SEL-487, SEL-551, SEL-651, SEL-700, SEL-735, SEL-751, SEL-787 │ │ │ ▼ ▼ ▼. Schweitzer Engineering Laboratories, Inc. reserves all rights and benefits afforded under federa l and international copyright and patent laws in its products, including without limitation software, firmware, and documentation. The information in this document is provided for informational use only. SEL offers complete power system awareness, protection, and automation solutions, with EtherNet/IP and IEC 61850 GOOSE to secure operational technology (OT) high-speed networks.