How long do power transformers hold a charge after power is removed? Are they like capacitors on old TVs?
The magnetic field in a transformer will hold a bit of energy for a short time as the field decays. If the transformer has a load attached, like in a power distribution network, it’s a very, very short time.
There may well also be capacitors on the line to compensate (aka improve the “power factor”) for inductive loads such as electric motors (e.g., AC). These capacitors almost certainly lose their charge quite quickly on a loaded distribution network.