Oil capacity varies widely by design, cooling class, voltage level, and manufacturer, so there is no single universal number. A 100 kVA distribution transformer is relatively small, so oil volume is often on the order of a few hundred liters, but it can be lower or higher depending on tank size and cooling surface. The most reliable way is to use the transformer nameplate or manufacturer drawing, because oil volume is a design attribute linked to thermal performance and expansion space. For logistics, utilities often maintain internal capacity tables by model family.
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