Distribution substation typically operates at 2. 5 kV voltage levels, and deliver electric energy directly to industrial and residential consumers. These feeders serve a large number of. This article examines the functions of four different types of substations within the electrical grid: step-up, step-down, transmission, and distribution. For balanced three-phase systems, the real power transferred is: $$P~=~sqrt {3}V_L I_L. High-voltage disconnecting switches are strategically positioned to facilitate the connection of these supply lines to the substation. These switches offer the capability to isolate lines during scheduled maintenance or unforeseen repair work, minimizing disruption to power distribution. As the demand for electrical power continues to grow, it can be met through power generation. Substation Technical Guide Book Moxa Americas USA Toll Free: 1-888-MOXA-USA (1-888-669-2872) Tel: +1-714-528-6777 Fax: +1-714-528-6778 www. com Moxa Europe Germany Tel: +49 89 3 70 03 99-0 Fax: +49 89 3 70 03 99-99 www.