The Buchholz Cut 1 is a mathematical operation used in electrical engineering, particularly when analyzing power systems. However, it seems like you're referring to something specific, so let me clarify. In power systems or electrical engineering, "Buchholz" often refers to the Buchholz relay, which is used in oil-immersed transformers to detect faults. But you might be asking about a calculation related to a Buchholz relay or something similar.
Could you provide a little more context? Are you asking about the calculation for a specific relay application, or is it related to some kind of transformer fault detection method? That will help me give you a more targeted answer.