降圧 こうあつ変圧 へんあつ ではありませんでした
kōatsuhen atsukidewārimasendeshita

Noun
Desu Copula

The polite, past negative form of 降圧変圧器

1. Was not a step-down transformer.

Past/Perfective
Negative
Polite
Formal Register
Electrical Engineering