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 "title": "220/230kV Three-Phase Oil-Immersed Power Transformer (31500–420000kVA, 50/60Hz)",
 "category": "power-transformer",
 "categoryName": "Power Transformers",
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 "overview": "This large three-phase oil-immersed power transformer is built for extra-high-voltage transmission and distribution networks, stepping 220kV/230kV down to 35kV/66kV. Available from 31500kVA up to 420000kVA, it uses copper or aluminium windings in a fully sealed tank with a top-mounted conservator and dense radiator banks for stable thermal performance under continuous heavy load at 50/60Hz.",
 "sellingPoints": [
  "220kV / 230kV primary → 35kV / 66kV secondary",
  "Wide capacity range: 31500kVA to 420000kVA",
  "Fully sealed construction with multi-winding design",
  "Dyn11 / Yyn0 vector groups, copper or aluminium windings",
  "Designed and tested to IEC / GB standards, internationally certified"
 ],
 "specs": [
  [
   "Product Type",
   "Oil-Immersed Power Transformer"
  ],
  [
   "Rated Capacity",
   "31500 kVA – 420000 kVA"
  ],
  [
   "Input Voltage",
   "220 kV / 230 kV"
  ],
  [
   "Output Voltage",
   "35 kV / 66 kV"
  ],
  [
   "Frequency",
   "50 / 60 Hz"
  ],
  [
   "Phase",
   "Three"
  ],
  [
   "Coil Number",
   "Multi Winding"
  ],
  [
   "Coil Structure",
   "Fully Sealed Construction"
  ],
  [
   "Winding Material",
   "Copper / Aluminium"
  ],
  [
   "Vector Group",
   "Dyn11 / Yyn0"
  ],
  [
   "Application",
   "Power Distribution System"
  ],
  [
   "Standard",
   "IEC / GB"
  ],
  [
   "Certification",
   "IEC, CE, ISO9001, ISO14001, ISO45001, CQC, GOST, EAC"
  ],
  [
   "Service Life",
   "20 Years"
  ],
  [
   "Packing",
   "Wooden Case"
  ],
  [
   "Package Size",
   "280 × 200 × 250 cm"
  ],
  [
   "Gross Weight",
   "5400 kg"
  ]
 ],
 "applications": "Suited to 220/230kV transmission substations, regional grid interconnection, large industrial power supply, and utility-scale power distribution projects.",
 "customisation": "Capacity, voltage ratio, vector group, cooling method, tap changer, and certification tailored to project specification. Winding material (copper or aluminium) available on request.",
 "faq": [
  {
   "q": "What is the rated capacity of the 220/230kV Three-Phase Oil-Immersed Power Transformer (31500–420000kVA, 50/60Hz)?",
   "a": "The standard configuration is rated 31500 kVA – 420000 kVA at 50 / 60 Hz. Other ratings in the same family can be built to order — tell us the load and we will confirm the nearest standard rating."
  },
  {
   "q": "What voltage ratio is available?",
   "a": "The standard unit is 220 kV / 230 kV input to 35 kV / 66 kV output. Voltage ratio, tapping range and vector group can be adjusted to your network; 50 Hz and 60 Hz designs are available."
  },
  {
   "q": "Which standards and certifications apply?",
   "a": "The product is designed to IEC / GB. MARS operates an ISO 9001 / 14001 / 45001 certified factory and holds CE (ECM), UDEM, EAC and CQC approvals; every unit is routine-tested before dispatch and type or witnessed tests can be arranged."
  },
  {
   "q": "Can this product be customised?",
   "a": "Capacity, voltage ratio, vector group, cooling method, tap changer, and certification tailored to project specification. Winding material (copper or aluminium) available on request."
  },
  {
   "q": "What is the lead time and how is it shipped?",
   "a": "Packed in wooden case. Typical lead time is 25–45 days after drawing approval for distribution equipment and 60–90 days for power transformers and containerised systems. Shipment is by sea from Shanghai on EXW, FOB, CIF or DAP terms with a full document pack."
  }
 ],
 "brand": "MARS",
 "manufacturer": "Shanghai Mars Electric Power Equipment Co., Ltd.",
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