絶縁 ぜつえん変圧 へんあつ じゃありませんでした
zetsuenhen'atsukijārimasendeshita

Noun
Desu Copula

The polite, past negative form of 絶縁変圧器

1. Was not an isolating transformer.; Was not a disconnection transformer.

Past/Perfective
Negative
Polite
Terminal Form