6 ms·
I have some doubts about "it's heavy so it's probably oil-filled". There are two common materials in transformers that are much denser than oil: iron and copper
by ahartmetz 5y ago
I have some doubts about "it's heavy so it's probably oil-filled". There are two common materials in transformers that are much denser than oil: iron and copper. There may or may not be oil in addition.
- BBC-vs-neolibs 5y agoMaybe the heuristic was, "something this heavy must be power dense, hence may need oil cooling".
- h2odragon 5y agoDunno about "oil" either, but pre-70's phone network stuff was weird. Bell was cagey about what could connect and how; i think partially because they had trouble keeping nasty transients off their wires. This transformer very likely didn't connect directly to a phone network; I would guess. It wouldn't surprise me if this was capable of being connected to nearly any lash up "intercom" type line too, which would be a place to have a robust output.
- jpm_sd 5y agoVery common, frequently toxic https://en.wikipedia.org/wiki/Transformer_oil https://en.wikipedia.org/wiki/Transformer_oil
- guenthert 5y agoVery common in power transformers as it is used for cooling (heat transfer). In an isolation transformer used in a modem cooling seems unnecessary.