Since the discovery of fire, ancient man has learned its good sides, but also the dangers it brings. Substations are part of a system used to transmit electricity. Their task is to transform the voltage from a higher voltage level to a lower one or vice versa. We are witnessing major climate change and crises in society, but also the development of society, which have a need for increasing electricity consumption. Higher consumption results in an increased risk of fires and explosions in electrical plants, installations and equipment, due to the deterioration of devices and equipment, loads, thunder and other weather disasters, and rodents and other animals that can cause fire. When designing a building, a fire risk assessment is made, on the basis of which different types of materials and systems are installed that prevent the harmful effects of fire if it does occur. The carbon dioxide fire extinguishing system is one of the oldest systems used for automatic fire extinguishing. Carbon dioxide has proven to be the most favorable means of extinguishing fires indoors, especially for those devices that are energized, as well as for substances that develop high temperatures and allow the rapid spread of the fire. When installing a fire detection and extinguishing system, the insurance premium charged by insurance companies is also reduced, especially if it is a facility that has a high material value. Proper selection and installation of fire detection and extinguishing systems, together with other construction and technological solutions for fire protection, represent safety and quality survival in the event of a fire, and then the task of the system is to localize it as soon as possible and prevent its further spread.