This document outlines laboratory experiments focused on various electrical protection relays, including IDMT Over Current, Differential, and Negative Sequence relays. It details objectives, apparatus, theoretical background, procedures, and results for each experiment, emphasizing safety protocols. This document outlines various electrical engineering experiments, including the operation of overcurrent relays, testing of circuit breakers, and the study of distance protection relays. Its basic eset (either manually or automatically) to resu e normal age Circuit Breaker (LVCB): Low-voltage (less than 1,000 VAC) Many relays use an electromagnet to mechanically operate a cuits), or where several circuits must excessive values of pow oad release. In ETAP relay which operates. er based Over Current Relay in DMT mode. Apparatus Used: - VPL-01 Study trainer module by Vi Microsystems (Current source module and Relay module combination), Power reasing and decreasing the current value. After setting the time value, press. Now increase the supply. To study symmetrical and Unsymmetrical faults. Study of Over-Current relay—To find time-current characteristics of IDMT relay with different time settings and plug settings. Study of Auto-Reclose. Relay protection plays roles of protection, measurement, and control in power systems, mainly applied in projects such as power plants, substations, and distribution stations. It has a wide scope of use and many application sites.