Overcurrent/reclosing relay.The SEL-551C overcurrent/reclosing relay with mixed I/O (Input/Output) The transfer of data between the CPU and a peripheral device. Every transfer is an output from one device and an input to another. See PC input/output. I/O - Input/Output connections and an optional front-panel communications port (hardware, communications) communications port - A connector for a communications interface, usually, a serial port. is said to enable easier system integration, plus simplified engineering access for monitoring, changing settings and downloading downloading - download fault data. The need for flexible communications and convenient engineering access to settings and data is said to be addressed by the SEL-511C overcurrent/ reclosing relay, which combines complete overcurrent protection and multi-shot reclosing to protect lines and equipment using a sensitive and secure mix of phase, negative-sequence and ground overcurrent elements. The SEL-551C relay is said to enable easy integration into industrial protection and control schemes with the Modbus RTU (Remote Terminal Unit) A device that collects data from data acquisition equipment and sends them to the main system over a wired or wireless network. See SCADA. protocol. A rear serial communications See serial transmission and serial. port is available as either an EIA-232 or an EIA-485 interface. Also new, an optional front-panel EIA-232 port is said to allow easy connection for engineering functions such as changing relay settings, downloading information, etc. Schweitzer Engineering Circle 83 on card |
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