The capacity specifications of drytype transformers follow international and national standards, with rated capacity as the core indicator, and are mainly divided into standard series and special customized specifications. These specifications are designed to match different load demands in industrial, commercial, and civil scenarios.

　　1. Core Specification: Rated Capacity Series

　　Rated capacity (unit: kVA) is the maximum apparent power a transformer can continuously supply under rated conditions. The most commonly used standard series globally (aligned with IEC and GB standards) are as follows:

　　LowCapacity Range (≤ 1600 kVA)

　　This range is widely used in commercial buildings, residential quarters, and small industrial plants.

　　Common specifications: 30, 50, 80, 100, 125, 160, 200, 250, 315, 400, 500, 630, 800, 1000, 1250, 1600 kVA.

　　Application example: A 1000kVA drytype transformer is typically used for a residential area with 8001000 households.

　　MediumCapacity Range (2000 – 10000 kVA)

　　This range is suitable for large industrial facilities, data centers, and industrial parks.

　　Common specifications: 2000, 2500, 3150, 4000, 5000, 6300, 8000, 10000 kVA.

　　Application example: A 5000kVA transformer can power a mediumsized manufacturing plant with multiple production lines.

　　HighCapacity Range (> 10000 kVA)

　　Highcapacity drytype transformers are mostly custommade and used in largescale projects such as power grids and heavy industry.

　　Typical specifications: 12500, 16000, 20000, 25000 kVA.

　　Note: Capacities above 20000 kVA require manufacturers to design core structures, cooling systems, and insulation schemes according to specific project requirements.

　　2. Key Supporting Specifications for Capacity

　　The rated capacity cannot be considered in isolation; it must be matched with other parameters to ensure safe and efficient operation.

　　3. Customization Rules for NonStandard Capacities

　　When standard capacities cannot meet specific needs (e.g., special load matching, space constraints), nonstandard capacities can be customized, but they must follow two principles:

　　1. Load Calculation Basis: The customized capacity must be determined by the actual total load (considering 10%20% reserve for future expansion). For example, if the actual load is 1800kVA, a 2000kVA standard transformer is preferred; if space is limited, a 1800kVA nonstandard model can be customized.

　　2. Manufacturing Feasibility: The core crosssection, winding wire diameter, and cooling system of nonstandard capacity transformers must be redesigned by manufacturers to ensure they meet insulation and temperature rise standards.

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