{"id":2052,"date":"2026-09-16T15:02:23","date_gmt":"2026-09-16T07:02:23","guid":{"rendered":"https:\/\/www.zishengelectric.com\/?post_type=product&p=2052"},"modified":"2026-09-16T15:02:24","modified_gmt":"2026-09-16T07:02:24","slug":"2500kva-oil-immersed-transformer","status":"publish","type":"product","link":"https:\/\/www.zishengelectric.com\/es\/product\/2500kva-oil-immersed-transformer","title":{"rendered":"2500kVA Oil Immersed Transformer"},"content":{"rendered":"
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The 2500kVA oil-immersed transformer is a high-capacity, three-phase distribution transformer designed to convert medium-voltage electricity into a stable low-voltage supply. With a rated capacity of 2.5MVA, it is suitable for utility networks, industrial plants, mining facilities, renewable energy projects, commercial complexes and major infrastructure systems.<\/p>\n

The transformer uses a low-loss silicon-steel core, mechanically reinforced copper or aluminum windings, transformer-grade insulating oil and a durable sealed tank. Voltage ratio, vector group, impedance, cooling method, efficiency, accessories and environmental protection can be customized for each project.<\/p>\n

Main Technical Specifications<\/h2>\n
\n
\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Parameter<\/th>\nStandard Configuration \/ Options<\/th>\n<\/tr>\n<\/thead>\n
Rated Capacity<\/td>\n2500kVA \/ 2.5MVA<\/td>\n<\/tr>\n
Transformer Type<\/td>\nThree-phase oil-immersed distribution transformer<\/td>\n<\/tr>\n
Primary Voltage<\/td>\n6kV\u201335kV or customized<\/td>\n<\/tr>\n
Secondary Voltage<\/td>\n400V, 415V, 440V, 480V, 690V or customized<\/td>\n<\/tr>\n
Rated Frequency<\/td>\n50Hz or 60Hz<\/td>\n<\/tr>\n
Cooling Method<\/td>\nONAN; ONAF optional<\/td>\n<\/tr>\n
Winding Material<\/td>\nCopper or aluminum<\/td>\n<\/tr>\n
Vector Group<\/td>\nDyn11, Dyn5, Yyn0, YNd1 or customized<\/td>\n<\/tr>\n
Tap Changer<\/td>\nOff-circuit tap changer or OLTC<\/td>\n<\/tr>\n
Typical Tapping Range<\/td>\n\u00b12 \u00d7 2.5%, \u00b15% or customized<\/td>\n<\/tr>\n
Short-Circuit Impedance<\/td>\nTypically 6%; customizable to approximately 5%\u20138%<\/td>\n<\/tr>\n
Core Material<\/td>\nCold-rolled grain-oriented silicon steel<\/td>\n<\/tr>\n
Insulating Fluid<\/td>\nMineral oil, natural ester or synthetic ester<\/td>\n<\/tr>\n
Tank Structure<\/td>\nHermetically sealed corrugated tank or conservator type<\/td>\n<\/tr>\n
Installation<\/td>\nIndoor or outdoor<\/td>\n<\/tr>\n
Standard Altitude<\/td>\nUp to 1,000m; high-altitude design available<\/td>\n<\/tr>\n
Ambient Temperature<\/td>\nTypically \u221225\u00b0C to +40\u00b0C; special design available<\/td>\n<\/tr>\n
Corrosion Protection<\/td>\nC3, C4 or C5 paint system<\/td>\n<\/tr>\n
Applicable Standards<\/td>\nIEC 60076, IEEE C57, ANSI, GB or project-specific standard<\/td>\n<\/tr>\n
Expected Service Life<\/td>\nApproximately 25\u201330 years under proper operating conditions<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

Typical Voltage Configurations<\/h2>\n

Available voltage ratios include:<\/p>\n

    \n
  • 6kV\/0.4kV<\/li>\n
  • 10kV\/0.4kV<\/li>\n
  • 11kV\/0.415kV<\/li>\n
  • 11kV\/0.433kV<\/li>\n
  • 13.8kV\/0.48kV<\/li>\n
  • 20kV\/0.4kV<\/li>\n
  • 22kV\/0.415kV<\/li>\n
  • 33kV\/0.415kV<\/li>\n
  • 33kV\/0.48kV<\/li>\n
  • 35kV\/0.4kV<\/li>\n
  • Other customized voltage combinations<\/li>\n<\/ul>\n

    Typical Rated Current<\/h2>\n

    The rated current depends on the selected voltage ratio.<\/p>\n

    \n
    \n\n\n\n\n\n\n\n\n\n\n\n\n
    Voltage Side<\/th>\nExample Voltage<\/th>\nApproximate Rated Current<\/th>\n<\/tr>\n<\/thead>\n
    High Voltage<\/td>\n10kV<\/td>\n144.3A<\/td>\n<\/tr>\n
    High Voltage<\/td>\n11kV<\/td>\n131.2A<\/td>\n<\/tr>\n
    High Voltage<\/td>\n20kV<\/td>\n72.2A<\/td>\n<\/tr>\n
    High Voltage<\/td>\n33kV<\/td>\n43.7A<\/td>\n<\/tr>\n
    Low Voltage<\/td>\n400V<\/td>\n3,608A<\/td>\n<\/tr>\n
    Low Voltage<\/td>\n415V<\/td>\n3,478A<\/td>\n<\/tr>\n
    Low Voltage<\/td>\n480V<\/td>\n3,007A<\/td>\n<\/tr>\n
    Low Voltage<\/td>\n690V<\/td>\n2,092A<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

    Values are calculated for a three-phase 2500kVA transformer and must be confirmed during engineering design.<\/em><\/p>\n

    Key Product Features<\/h2>\n

    Low-Loss Magnetic Core<\/h3>\n

    The transformer core is manufactured from high-permeability, cold-rolled grain-oriented silicon steel. Step-lap construction helps reduce no-load loss, excitation current, operating noise and vibration.<\/p>\n

    Reinforced Winding Structure<\/h3>\n

    Copper or aluminum windings are mechanically reinforced to withstand thermal stress, voltage fluctuations and short-circuit forces. Internal oil ducts improve heat dissipation throughout the winding structure.<\/p>\n

    Efficient Cooling System<\/h3>\n

    Transformer oil provides electrical insulation and transfers heat from the core and windings to the tank or radiators.<\/p>\n

      \n
    • ONAN cooling is suitable for standard continuous operation.<\/li>\n
    • ONAF cooling with fans is available for increased loading or high-temperature conditions.<\/li>\n<\/ul>\n

      Reliable Tank Construction<\/h3>\n

      A hermetically sealed corrugated tank helps prevent moisture and oxygen from entering the insulation system, reducing oil oxidation and maintenance requirements.<\/p>\n

      A conservator-type tank with a Buchholz relay can also be provided.<\/p>\n

      Stable High-Load Operation<\/h3>\n

      The electrical and mechanical design provides:<\/p>\n

        \n
      • Low no-load and load losses<\/li>\n
      • Stable secondary voltage<\/li>\n
      • Controlled operating temperature<\/li>\n
      • Strong short-circuit resistance<\/li>\n
      • Low noise and vibration<\/li>\n
      • Reliable continuous operation<\/li>\n
      • Reduced lifetime energy costs<\/li>\n<\/ul>\n

        Adaptability to Harsh Environments<\/h3>\n

        Special designs are available for:<\/p>\n

          \n
        • High ambient temperatures<\/li>\n
        • High-altitude locations<\/li>\n
        • Coastal and salt-fog environments<\/li>\n
        • Desert and dusty areas<\/li>\n
        • Tropical and high-humidity climates<\/li>\n
        • Mining and heavy industrial sites<\/li>\n
        • Chemically aggressive environments<\/li>\n
        • Solar and wind power projects<\/li>\n<\/ul>\n

          Main Components<\/h2>\n

          A typical 2500kVA oil-immersed transformer includes:<\/p>\n

            \n
          • Magnetic core<\/li>\n
          • High-voltage winding<\/li>\n
          • Low-voltage winding<\/li>\n
          • Transformer insulating oil<\/li>\n
          • Main transformer tank<\/li>\n
          • Corrugated fins or external radiators<\/li>\n
          • High-voltage bushings<\/li>\n
          • Low-voltage bushings<\/li>\n
          • Neutral bushing<\/li>\n
          • Off-circuit tap changer<\/li>\n
          • Pressure-relief device<\/li>\n
          • Oil-level indicator<\/li>\n
          • Oil filling and drain valves<\/li>\n
          • Earthing terminals<\/li>\n
          • Lifting lugs<\/li>\n
          • Jacking pads<\/li>\n
          • Rollers or skid base<\/li>\n
          • Stainless-steel rating plate<\/li>\n<\/ul>\n

            Optional Accessories<\/h2>\n

            Available accessories include:<\/p>\n

              \n
            • Buchholz relay<\/li>\n
            • Oil temperature indicator<\/li>\n
            • Winding temperature indicator<\/li>\n
            • Magnetic oil-level gauge<\/li>\n
            • Sudden-pressure relay<\/li>\n
            • Pressure vacuum gauge<\/li>\n
            • Cooling fans<\/li>\n
            • Marshalling box<\/li>\n
            • Current transformers<\/li>\n
            • Neutral current transformer<\/li>\n
            • Surge arresters<\/li>\n
            • Cable boxes<\/li>\n
            • Plug-in bushings<\/li>\n
            • HV and LV terminal enclosures<\/li>\n
            • Remote alarm and trip contacts<\/li>\n
            • Online temperature-monitoring system<\/li>\n
            • Digital transformer-monitoring interface<\/li>\n
            • Anti-condensation heater<\/li>\n<\/ul>\n

              Customization Options<\/h2>\n
              \n
              \n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
              Item<\/th>\nAvailable Options<\/th>\n<\/tr>\n<\/thead>\n
              Voltage Ratio<\/td>\nCustomized primary and secondary voltages<\/td>\n<\/tr>\n
              Frequency<\/td>\n50Hz or 60Hz<\/td>\n<\/tr>\n
              Winding Material<\/td>\nCopper or aluminum<\/td>\n<\/tr>\n
              Vector Group<\/td>\nAccording to the electrical system<\/td>\n<\/tr>\n
              Tap Regulation<\/td>\nOff-circuit or on-load tap changer<\/td>\n<\/tr>\n
              Impedance<\/td>\nCustomized for fault-current and protection requirements<\/td>\n<\/tr>\n
              Cooling Method<\/td>\nONAN or ONAF<\/td>\n<\/tr>\n
              Insulating Fluid<\/td>\nMineral oil, natural ester or synthetic ester<\/td>\n<\/tr>\n
              Tank Design<\/td>\nSealed corrugated or conservator type<\/td>\n<\/tr>\n
              Efficiency Level<\/td>\nAccording to local regulations or tender requirements<\/td>\n<\/tr>\n
              Temperature Rise<\/td>\nStandard or reduced temperature-rise design<\/td>\n<\/tr>\n
              Noise Level<\/td>\nStandard or low-noise configuration<\/td>\n<\/tr>\n
              Corrosion Protection<\/td>\nC3, C4 or C5 paint system<\/td>\n<\/tr>\n
              Terminals<\/td>\nBushings, cable boxes or busbar connections<\/td>\n<\/tr>\n
              Environmental Design<\/td>\nTropical, desert, coastal, cold-climate or high-altitude<\/td>\n<\/tr>\n
              Monitoring<\/td>\nLocal instruments or remote digital monitoring<\/td>\n<\/tr>\n
              Standards<\/td>\nIEC, IEEE\/ANSI, GB or customer-specified standard<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

              Manufacturing Process<\/h2>\n
                \n
              1. Technical requirement review<\/li>\n
              2. Electrical and mechanical design<\/li>\n
              3. Customer drawing approval<\/li>\n
              4. Core cutting and stacking<\/li>\n
              5. High- and low-voltage winding production<\/li>\n
              6. Active-part assembly<\/li>\n
              7. Vacuum drying and insulation treatment<\/li>\n
              8. Tank fabrication and surface coating<\/li>\n
              9. Vacuum oil filling<\/li>\n
              10. Electrical and mechanical testing<\/li>\n
              11. Final inspection, packing and shipment<\/li>\n<\/ol>\n

                Routine Factory Tests<\/h2>\n

                Every 2500kVA transformer undergoes routine testing before shipment, including:<\/p>\n

                  \n
                • Winding resistance measurement<\/li>\n
                • Voltage-ratio measurement<\/li>\n
                • Vector-group verification<\/li>\n
                • No-load loss and current measurement<\/li>\n
                • Load-loss measurement<\/li>\n
                • Short-circuit impedance measurement<\/li>\n
                • Insulation resistance measurement<\/li>\n
                • Applied voltage withstand test<\/li>\n
                • Induced overvoltage withstand test<\/li>\n
                • Transformer oil testing<\/li>\n
                • Tap-changer functional test<\/li>\n
                • Tank leakage inspection<\/li>\n
                • Accessory and alarm-contact testing<\/li>\n
                • Visual and dimensional inspection<\/li>\n<\/ul>\n

                  Optional Type and Special Tests<\/h2>\n

                  The following tests can be arranged according to the project specification:<\/p>\n

                    \n
                  • Temperature-rise test<\/li>\n
                  • Lightning impulse test<\/li>\n
                  • Sound-level measurement<\/li>\n
                  • Partial-discharge test<\/li>\n
                  • Zero-sequence impedance measurement<\/li>\n
                  • Capacitance and dissipation-factor test<\/li>\n
                  • Frequency response analysis<\/li>\n
                  • Dissolved-gas analysis<\/li>\n
                  • Short-circuit withstand test<\/li>\n
                  • Customer-witnessed FAT<\/li>\n
                  • Independent third-party inspection<\/li>\n<\/ul>\n

                    Applications<\/h2>\n

                    The 2500kVA oil-immersed transformer is suitable for:<\/p>\n

                      \n
                    • Utility distribution networks<\/li>\n
                    • Industrial factories<\/li>\n
                    • Manufacturing plants<\/li>\n
                    • Mining projects<\/li>\n
                    • Steel and cement plants<\/li>\n
                    • Oil and gas facilities<\/li>\n
                    • Solar photovoltaic power plants<\/li>\n
                    • Wind farms<\/li>\n
                    • Battery energy-storage systems<\/li>\n
                    • Commercial complexes<\/li>\n
                    • Hospitals and airports<\/li>\n
                    • Water-treatment facilities<\/li>\n
                    • Data centres<\/li>\n
                    • Municipal infrastructure<\/li>\n
                    • Industrial parks<\/li>\n
                    • EPC power-distribution projects<\/li>\n<\/ul>\n

                      Packing and Shipping<\/h2>\n

                      The transformer is secured on a reinforced steel or wooden base and protected with moisture-resistant export packaging. Bushings, radiators, conservators and vulnerable accessories may be removed and packed separately when necessary.<\/p>\n

                      Available transportation methods include:<\/p>\n

                        \n
                      • Open-top container<\/li>\n
                      • Flat-rack container<\/li>\n
                      • Breakbulk vessel<\/li>\n
                      • Road transportation<\/li>\n
                      • Railway transportation<\/li>\n
                      • Multimodal international transport<\/li>\n<\/ul>\n

                        The documentation package can include approved drawings, routine test reports, operation manuals, packing lists, quality certificates and FAT records.<\/p>\n

                        Information Required for a Quotation<\/h2>\n

                        Please provide:<\/p>\n

                          \n
                        • Primary and secondary voltage<\/li>\n
                        • Frequency<\/li>\n
                        • Vector group<\/li>\n
                        • Winding material<\/li>\n
                        • Required impedance<\/li>\n
                        • Tap range and tap-changer type<\/li>\n
                        • Applicable standard<\/li>\n
                        • Installation altitude<\/li>\n
                        • Maximum and minimum ambient temperature<\/li>\n
                        • Indoor or outdoor installation<\/li>\n
                        • Cable or busbar connection<\/li>\n
                        • Required accessories<\/li>\n
                        • Efficiency or loss requirements<\/li>\n
                        • Quantity<\/li>\n
                        • Destination country<\/li>\n<\/ul>\n

                          Final losses, insulation levels, dimensions, oil quantity, total weight and accessory configuration are subject to the approved technical specification and manufacturing drawings.<\/em><\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

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                          <\/div>\n<\/div>\n<\/div>\n<\/section>\n<\/div>\n<\/div>\n
                          <\/div>\n","protected":false},"excerpt":{"rendered":"

                          The 2500kVA oil-immersed transformer is a high-capacity, three-phase distribution transformer designed to convert medium-voltage electricity into a stable low-voltage supply. With a rated capacity of 2.5MVA, it is suitable for utility networks, industrial plants, mining facilities, renewable energy projects, commercial complexes and major infrastructure systems. The transformer uses a low-loss silicon-steel core, mechanically reinforced copper […]<\/p>\n","protected":false},"featured_media":2053,"template":"","meta":{"themepark_post_bcolor":"#f5f5f5","themepark_post_width":"1022px","themepark_post_img":"","themepark_post_img_po":"left","themepark_post_img_re":false,"themepark_post_img_cover":false,"themepark_post_img_fixed":false,"themepark_post_hide_title":false,"themepark_post_main_b":"","themepark_post_main_p":100,"themepark_paddingblock":false},"product_brand":[],"product_cat":[71],"product_tag":[],"class_list":["post-2052","product","type-product","status-publish","has-post-thumbnail","product_cat-oil-immersed-transformer","first","instock","shipping-taxable","product-type-simple"],"_links":{"self":[{"href":"https:\/\/www.zishengelectric.com\/es\/wp-json\/wp\/v2\/product\/2052","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.zishengelectric.com\/es\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/www.zishengelectric.com\/es\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.zishengelectric.com\/es\/wp-json\/wp\/v2\/media\/2053"}],"wp:attachment":[{"href":"https:\/\/www.zishengelectric.com\/es\/wp-json\/wp\/v2\/media?parent=2052"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/www.zishengelectric.com\/es\/wp-json\/wp\/v2\/product_brand?post=2052"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/www.zishengelectric.com\/es\/wp-json\/wp\/v2\/product_cat?post=2052"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/www.zishengelectric.com\/es\/wp-json\/wp\/v2\/product_tag?post=2052"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}