BLOG 10/09/2026 10
Ask a protection engineer what the most underrated device on a transformer is, and you’ll get a lot of different answers. Ask the same engineer what they check first when a transformer trips unexpectedly, and the answer is almost always the same: the Buchholz relay. It’s a small metal chamber mounted on the pipe between the transformer tank and the conservator. No moving parts you can see from the outside. No displa??
BLOG 10/09/2026 9
Ask any substation operator what keeps them up at night, and they won’t say “bushings.” They’ll say “load,” “weather,” “protection coordination,” maybe “that one relay that’s been acting up.” But when something actually goes wrong—when a transformer trips offline in the middle of the night—the first questions are almost always about the small stuff: ??
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What’s Inside, How It Works, and What to Check Before You Install By Ziyang · Transformer Protection · 6 min read QJ12-80 double-float Buchholz relay, DN80 Opening We get asked about Buchholz relays almost every week. Not because they’re complicated — they’re actually one of the simplest protection devices on a transformer. But because there’s a lot of wrong information ??