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11000/433 tx

lyledunn

I note several IET publications refer to a tx on the public system as 11000/433v. I haven’t noticed this on DNO transformer nameplates. More often it is 11Kv /400 or 11Kv/415. 433 divided by root 3 is 250. Anyone advise?

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  • 0

    Yes 433V will be the nominal voltage and the transformer will likely have a 'De-energised Tap Changer' (DETC), a mechanism that once the transformer is de-energised and isolated, can be used adjust the voltage by changing the selected tap. The details of the number of taps and tap voltages will also normally be included on the nameplate. 

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    Yes 433V will be the nominal voltage and the transformer will likely have a 'De-energised Tap Changer' (DETC), a mechanism that once the transformer is de-energised and isolated, can be used adjust the voltage by changing the selected tap. The details of the number of taps and tap voltages will also normally be included on the nameplate. 

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  • 0 in reply to TurboGen

    433V is a no-load nameplate rating chosen to allow for on-load regulation drop-back to ~400-415V, not a live system voltage, and not inconsistent with 400/415V DNO practice, it's the same system, described from a different point (transformer design rating vs. network operating voltage).

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