Do you know the definition of substation

A line connection point in a power grid, a facility used to transform voltage, exchange power, and collect and distribute electrical energy. There are power distribution devices of different voltages in the substation, power transformers, control, protection, measurement, signal and communication facilities, and secondary circuit power supplies. Some substations are also equipped with shunt capacitors, shunt reactors, static reactive power compensation devices, series capacitor compensation devices, synchronous cameras, etc. due to factors such as reactive power balance, system stability, and limiting overvoltage.