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The 4000 kVA Transformer has a primary voltage of 33 kV or 11 kV and a secondary voltage of 400 V or 230 V. It has a rated frequency of 50 Hz or 60 Hz. The transformer is designed with advanced welding technology to ensure that it has a high degree of mechanical strength, excellent insulation properties, and resistance to high temperatures.link:https://www.goodtransformer.com/distribution-transformer/4000-kva-transformer.html