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As a part of the one-line diagram, a power transformer is shown as below:

enter image description here

Here what I understand is that 400/132kV means 400V is the primary nominal voltage and 132kV is the secondary nominal voltage.

And MVA is the nominal apparent power. But what does 140/155MVA mean in this context? Are they minimum and maximum power? Why there are two numbers with a slash?

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    \$\begingroup\$ It's more likely a 400 kV to 132 kV step-down transformer. However, with no other context or provenance it might just as well be anything. \$\endgroup\$ – Andy aka Oct 6 at 8:59
  • \$\begingroup\$ Maybe nominal and surge MVA? What does the document you clipped the diagram from say about the nomenclature? \$\endgroup\$ – Neil_UK Oct 6 at 9:14
  • \$\begingroup\$ guess 140 is the effective power \$\endgroup\$ – schnedan Oct 6 at 13:08

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