Substation1
Dictionary of Electrical Engineering

Commonly used terms in the Electrical industry.

pad
(1) a device (network) that impedance matches and/or attenuates. Typically used to refer to a coax attenuator.
(2) a concrete foundation, usually prefabricated and used to support power transformers in underground residential distribution work.
pad-mount transformer
a heavily-enclosed distribution transformer mounted at grade level upon a concrete slab or pad.