re: Chinese transformers in U.S. power grid have remote backdoor shutoff switches

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massive power transformers do not have switches internally.

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You are correct, but any transformer this size will have an overpressure trip, a Bucholz relay, etc. that connects to the switchgear. Infiltrate one of these devices and the protective controls and breakers do the rest.

I would not put this past our red friends.

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The circuit breaker is controlled via contacts, relays, or remote hand switches to open or close.

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when first saw thread open began thinking about possible methods.

first thought is controls (ge, abb, siemens, woodward, sel, eaton) sf6 breaker controls could all be forced to trip on false flag power conditions. ie unbalance amperage (hate word current), unbalance voltage, frequency all power elements measured by their appropriate inputs but software/firmware could override the true measurement. this happen incoordination at every substation with infected controls that would start rolling blackouts.
this could take engineering investigations awhile to figure out problem allowing to repeat after every attempt to reclose.

second weak spot is any goab forced to open under load could fry those contact bars that would take a long time to source parts and make repairs

third thought is all power generation sources, prime mover source fake out actual speed thus forcing more speed till she flys apart (yes mechanical trip valve should save the day but when did anybody actually tempt fate they work in fear of run away) or all those renewables based on igbts that could be forced to short the clearing amperage demand would have to come from spinning reserves.

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I suppose it's possible to have a neutral disconnect contactor on a WYE wound secondary. Being able to trip it could cause the transformer in an isolated system to produce some wacky L-G voltages.

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I feel like you’ve been waiting for the perfect opportunity to drop some electrical knowledge and you found it

Spoken about on Shawn Ryan awhile back

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what sel, you forget they are probably the biggest employer of techy slant eyes

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I haven't followed them in recent years, but they are an employee owned company, and iirc, they manufactured their relays domestically.

The make up of the ethnicity of their employees, I don't know.

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showcase some knowledge

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That would be a first

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If the Chinese cut off transformers in our grid that would be a direct declaration of war and they won’t do that.

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Your assuming that we would know or be able to prove China was responsible. If any of this is true, I'm sure China understands how to execute this without leaving proof they are responsible.

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Everything you said, I agree with. I'm just trying to place this secret switch that is built into the unit that could disable a massive transformer.

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non i know of directly only ancillary components other thing forgot which i believe is mostly all made in china is the gas analyzer that accompanies these beast. only thing internal would be the online tap changer but they usually operate all 3 phases at once but drastically changing that setting could turn transformer into a rocket ship !

"Transformers! Chicoms in disguise."

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Even if they do have this feature, we can turn China's lights off just as easily.

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Surely, the CIA could figure out how to blow The Three Gorges Damn! Lol