{
 "slug": "66-220-kv-three-winding-oil-immersed-substation-power-transformer",
 "title": "66 / 220 kV Three-Winding Oil-Immersed Substation Power Transformer",
 "category": "power-transformer",
 "categoryName": "Power Transformers",
 "url": "https://www.electrical-equipment-factory.com/products/power-transformer/66-220-kv-three-winding-oil-immersed-substation-power-transformer/",
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 "overview": "A three-phase, three-winding oil-immersed substation power transformer stepping 220 / 66 kV down to a low-voltage output for high-voltage transmission substations. Built with a sealed steel tank, radiator cooling and a conservator oil-expansion system, it delivers efficient, reliable transformation at transmission class. Copper or aluminium windings, IEC/GB compliant.",
 "sellingPoints": [
  "Three-winding design for 220 / 66 kV transmission substations",
  "Oil-immersed sealed construction with radiator cooling and conservator",
  "Vector group Dyn11 / Yyn0 to suit substation single-line requirements",
  "Low-loss copper or aluminium windings for high efficiency",
  "ISO9001 quality system; IEC / GB standards"
 ],
 "specs": [
  [
   "Product Type",
   "Three-Phase Three-Winding Oil-Immersed Power Transformer"
  ],
  [
   "Input Voltage (HV)",
   "220 / 66 kV"
  ],
  [
   "Output Voltage (LV)",
   "400 V (or custom)"
  ],
  [
   "Frequency",
   "50 / 60 Hz"
  ],
  [
   "Phase",
   "Three"
  ],
  [
   "Coil Number",
   "Three Windings"
  ],
  [
   "Winding Material",
   "Copper / Aluminium"
  ],
  [
   "Vector Group",
   "Dyn11 / Yyn0"
  ],
  [
   "Cooling",
   "ONAN / ONAF (oil-immersed, radiator)"
  ],
  [
   "Standard",
   "IEC / GB"
  ],
  [
   "Certification",
   "ISO9001"
  ],
  [
   "Packing",
   "Wooden Case"
  ]
 ],
 "applications": "High-voltage transmission substations, utility and industrial power networks, and interconnection stations requiring 220 / 66-kV-class transformation.",
 "customisation": "Capacity, HV/LV voltage, vector group, tap-changer type, cooling class and fittings are customizable to project single-line requirements.",
 "faq": [
  {
   "q": "What voltage ratio is available?",
   "a": "The standard unit is 220 / 66 kV input to 400 V (or custom) 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, HV/LV voltage, vector group, tap-changer type, cooling class and fittings are customizable to project single-line requirements."
  },
  {
   "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."
  }
 ],
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 "manufacturer": "Shanghai Mars Electric Power Equipment Co., Ltd.",
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