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 "title": "110–115 kV Three-Phase Oil-Immersed Power Transformer 20–50 MVA with OLTC",
 "category": "power-transformer",
 "categoryName": "Power Transformers",
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 "overview": "A large three-phase oil-immersed power transformer rated 20 / 25 / 50 MVA, stepping 110–115 kV down to 11 / 23 kV, equipped with an on-load tap changer (OLTC) for automatic voltage regulation under load. Built for utility substations and heavy industrial supply, it combines a sealed steel tank, radiator cooling and a conservator oil-expansion system for a 20-year design life. Copper or aluminium windings, IEC/GB compliant.",
 "sellingPoints": [
  "On-load tap changer (OLTC) — regulates output voltage without interrupting supply",
  "High-capacity 20 / 25 / 50 MVA at 110–115 kV transmission class",
  "Oil-immersed sealed design with radiator cooling and conservator",
  "Vector group Dyn11 / Yyn0 to suit substation single-line requirements",
  "20-year service life; certified CE, UL, ISO9001, IEC/GB"
 ],
 "specs": [
  [
   "Product Type",
   "Three-Phase Oil-Immersed Power Transformer"
  ],
  [
   "Rated Capacity",
   "20 / 25 / 50 MVA"
  ],
  [
   "Input Voltage (HV)",
   "110 / 115 kV"
  ],
  [
   "Output Voltage (LV)",
   "11 / 23 kV"
  ],
  [
   "Frequency",
   "50 / 60 Hz"
  ],
  [
   "Phase",
   "Three"
  ],
  [
   "Winding Material",
   "Copper / Aluminium"
  ],
  [
   "Voltage Regulation",
   "On-Load Tap Changer (OLTC)"
  ],
  [
   "Vector Group",
   "Dyn11 / Yyn0"
  ],
  [
   "Cooling",
   "ONAN / ONAF (oil-immersed, radiator)"
  ],
  [
   "Standard",
   "IEC / GB"
  ],
  [
   "Certification",
   "CE, UL, ISO9001"
  ],
  [
   "Service Life",
   "20 Years"
  ],
  [
   "Packing",
   "Wooden Case"
  ]
 ],
 "applications": "Utility and industrial substations, power transmission and distribution networks, renewable-energy step-up/step-down stations and large plants requiring regulated 110-kV-class transformation.",
 "customisation": "Capacity, HV/LV voltage, vector group, tap-changer type (OLTC/off-circuit), cooling class and fittings are customizable to project single-line requirements.",
 "faq": [
  {
   "q": "What is the rated capacity of the 110–115 kV Three-Phase Oil-Immersed Power Transformer 20–50 MVA with OLTC?",
   "a": "The standard configuration is rated 20 / 25 / 50 MVA 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 110 / 115 kV input to 11 / 23 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, HV/LV voltage, vector group, tap-changer type (OLTC/off-circuit), 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."
  }
 ],
 "brand": "MARS",
 "manufacturer": "Shanghai Mars Electric Power Equipment Co., Ltd.",
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