Answer: A transformer is a specific piece of electrical equipment used to change the voltage level of electricity, either increasing (step-up) or decreasing (step-down) it. A substation, on the other hand, is an entire facility or station that houses multiple pieces of equipment, including one or more transformers, to manage the flow of electricity. While a transformer is the core component that changes voltage, a substation is the complete system that protects, controls, and transforms power for distribution. Ningbo Changshi manufactures a variety of tools and equipment essential for the installation, maintenance, and repair of both transformers and the entire substation facility.