92 Protective Relaying Based on the SIPROTEC 5 Series from Siemens Modern, time-efficient, and interactive hands-on training Protective relaying provides detection of abnormal operating conditions in electrical systems and is needed in order to act quickly to protect circuits, equipment, and the general public. The theoretical background, as well as practical application, of these protective devices and their protection functions are an important part of the education of power systems for electrical engineers. Power-utility-grade equipment, Siemens’ newest generation the SIPROTEC 5 series, is used in this innovative teaching approach. State-of-the-art hardware Three relays are available and must be selected in accordance with the desired learning path. Each features a display that can provide information about the relay protection functions, indicate numerous currently measured values such as the line voltages, line currents, phase power, three-phase power, and power factor, and show information about trip events that have been recorded. A keypad, also on the front panel of the relay, allows users to select the information displayed. The front panel of the relay also features a set of 16 LEDs that allows quick monitoring of the status of various relay functions. Relay programming Relay programming (e.g., protection function selection, function settings) is achieved via the Siemens DIGSI 5 software via a USB connection or using the keypad and display located on the front panel of the relay. Once programmed, the relays can be tested using a built-in relay testing unit to ensure it is programmed to operate as expected. This eliminates the need for users to purchase a costly external relay tester to perform relay testing. Access to the voltage and current inputs, Ethernet port, binary inputs, and binary outputs (e.g., trip contacts) of the relay is through a removable panel located at the back of the relay enclosure. A variant of each relay with safety jacks and connectors mounted on the front panel to provide access to all relay inputs, outputs, and ports is also available. Variant with external connectors Electric Power Technology > Protective Relaying → Video
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