Control and relay panels detect faults in the power system, such as overloads, short circuits, or phase imbalances, and initiate protective measures. Relays within the panels trip circuit breakers to isolate faulty sections, minimizing damage and ensuring the safety. Whether it is a control and relay panel in a substation, a 132 kV control relay panel, or a 220 kV control relay panel, these solutions form the nerve centre of grid protection. Hartek, one of India's leading engineering, grid-synchronisation, and substation solution providers, continues to empower. Relion protection and control relays for several application reduce complexity. They serve as the brain of substation operations, coordinating responses to any faults or disturbances and ensuring the stable and efficient. As the protected components of the electrical systems have changed in size, configuration and their critical roles in the power system supply, some protection aspects need to be revisited (i. the use of protection systems to reduce arc flash energy in distribution systems). Differential protection REF protection (Residual Earth Fault) SEF protection (Sensitive Earth Fault) Over current protection Breaker failure protection Line differential. In cases when there are two sets of direct current (DC) sources, the relays are electrically and physically split into two groups in order to achieve redundancy and facilitate the removal of a protection for maintenance purposes while the protected equipment is in operation.