Steam-based heating processes use latent heat and transfer it to a given product. When the work is done (i.e. steam has given up its latent heat), steam condenses and becomes condensate. In other words, condensate does not have the ability to do the work that steam does.
Subtransmission is part of an electric power transmission system that runs at relatively lower voltages. It is uneconomical to connect all distribution substations to the high main transmission voltage, because the equipment is larger and more expensive.
How does a substation work and what are its functions? Substations are of two types. The first one is the transmission substation where the voltage is stepped up for transmission over large distances. The second is at the end of the transmission and is called the power substation.