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A power transformer model name typically includes specific details that indicate its type, capacity, voltage class, cooling system, and other design characteristics. The naming convention can vary among manufacturers, but here's a general example of how a power transformer model name might be structured:

XYZ-10000/110-220/33kV ONAN

Let's break down this example:

• XYZ: This could represent the manufacturer's code or series identifier. Different manufacturers use different codes.

• 10000: This number indicates the transformer's rated apparent power in kVA (kilo-Volt-Amps). It signifies the maximum power the transformer can handle without exceeding its thermal limits.

• 110-220/33kV: These numbers denote the transformer's voltage ratings. The first set ('110-220') represents the primary side voltage levels (high voltage winding), indicating it can be connected to a network operating at voltages between 110kV and 220kV. The '/33kV' refers to the secondary side voltage (low voltage winding), meaning it steps down the voltage to 33kV.

• ONAN: This acronym describes the transformer's cooling system. 'ONAN' stands for Oil-Natural Air Natural, which means the transformer uses natural circulation of oil for cooling the windings, and natural air flow for cooling the radiators or tank surface. Other common cooling systems include ONAF (Oil-Natural Air Forced), OFAF (Oil-Forced Air Forced), etc.

Above is a basic understanding of how a power transformer model name conveys important technical information. Always refer to the manufacturer's documentation for precise interpretation of a particular model name.