FIT Standard
Fluid-immersed distribution transformer, standard incl. substation, ≤ 3.15 MVA
FIT Standard
- Key element at the last step of the power grid — converts medium voltage (up to 36 kV) to low voltage at identical frequency for DSOs, municipalities and substations
- Hermetically sealed tank with corrugated walls absorbing fluid volume change; open-system or oil-conservator designs alternatively available
- Low no-load and load losses compliant with EU Ecodesign Directive 2009/125/EC and Regulation (EU) 2019/1783
- Ester-filled sibling variant available: fire point above 300 °C, K-class per IEC 61039, readily biodegradable per OECD 301
- Step-lap core of cold-rolled (optionally laser-treated) sheets and diamond-dotted-paper-bonded windings for low noise and high short-circuit capacity
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FIT Standard covers up to 36 kV of the distribution transformers range (≤ 52 kV across the category, √ scale).
Specifications
Main
| Product type | Fluid-immersed (oil-immersed) distribution transformer — standard variant incl. substation transformers |
| Family | FITformer® / Siemens Energy fluid-immersed distribution transformer portfolio, GT hierarchy DT Fit Class 12 |
| Function | Conversion of medium voltage to low voltage at identical frequency — the link between the electrical grid and consumers |
| Applications | Distribution grids (DSOs, municipalities), suburban, urban and industrial areas; compact substations |
| Insulating liquid | Mineral oil; ester-filled variant available as separate class-12 sibling (FIT Stand. incl. Subst. ≤ 3.15 MVA Ester) |
| Delivery condition | Fully assembled and fluid-filled; plug-and-play solutions available |
Electrical ratings
| Rated power | ≤ 3,150 kVA (this class; family floor 50 kVA per Budapest factory ratings, family continues as FIT Large > 3.15 MVA) |
| Max system voltage | Up to 36 kV |
| Secondary voltage | Typically 250–800 V (usually 250 or 450 V per product page) |
| Rated frequency | 50 or 60 Hz |
| Losses | Low no-load and load losses per EU Ecodesign; low no-load noise via step-lap core assembly |
| Harmonics | High withstand capability against harmonics |
Construction
| Tank | Hermetically sealed with corrugated walls absorbing insulation-liquid volume change; alternatively open system or oil conservator; bolted (optionally welded) sheet-steel lid |
| Corrosion protection | Sandblasted, multicoated surface; hot-dip galvanization on request |
| Core | High-grade cold-rolled (optionally laser-treated) sheets, precision-cut, step-lap assembly — or precise winding technology at lower power ratings |
| Windings | Copper or aluminum; LV from strip or flat wire, HV from round or profile wire; diamond-dotted epoxy-coated paper bonds windings for higher short-circuit capacity |
| Drying & filling | Vacuum low-frequency heating (LFH) drying; filled with preheated insulation liquid while still in the plant |
| Digital option | Sensformer® Basic connectivity/monitoring on request |
Standards & testing
| Product standards | IEC, EN (per Budapest factory production details) |
| Ecodesign | EU Ecodesign Directive 2009/125/EC and Regulation (EU) 2019/1783 of October 1st, 2019 |
| Ester fluid classification | K-class insulating liquid per IEC 61039; readily biodegradable per OECD 301; tank-rupture prevention improved up to 20% (ester variant) |
| Routine & special tests | Voltage, temperature-rise, insulation-resistance, partial-discharge, harmonics and noise-level tests in factory HV test bay; short-circuit and vibration tests at internationally recognized institutes |
| Factory certifications | ISO 9001, ISO 14001, ISO 45001, ISO 50001, ISO 3834-2 (Budapest DT factory) |
Options & variants
Variant split per GT_Product_Hierarchy Rev03 (DT Fit, Class 12/13); power and voltage ceilings from Siemens Energy fluid-immersed DT factory-portfolio slides (Budapest: 50 kVA–5,000 kVA, up to 36 kV, 50/60 Hz) and ester properties from the insulation-fluids slide.
| Variant | Rated power | Max system voltage | Notes |
|---|---|---|---|
| FIT Standard incl. Subst. ≤ 3.15 MVA | ≤ 3,150 kVA | 36 kV | Mineral-oil filled; 50/60 Hz; IEC/EN; hermetically sealed tank |
| FIT Stand. incl. Subst. ≤ 3.15 MVA Ester | ≤ 3,150 kVA | 36 kV | Ester-filled: fire point > 300 °C, K-class per IEC 61039, readily biodegradable (OECD 301) |
| FIT Large > 3.15 MVA (related class) | > 3,150 kVA (Budapest family up to 5,000 kVA) | 36 kV | Larger fluid-immersed DTs; wider portfolio up to 30 MVA / 145 kV |
Compatible accessories
Digital monitoring
Sensformer® Basic digital connectivity and monitoring
Monitoring & diagnostics
SITRAM® H2Guard Lite online hydrogen (DGA) monitor, 25–5000 ppm, Modbus/DNP3.0
Insulating fluid option
Biodegradable ester insulating liquid (synthetic or natural, K-class per IEC 61039)
Documents & downloads
Presentation Fluid-immersed distribution transformers — family overview & factory network
Presentation Distribution Transformers — portfolio, variants & technical innovations
Fact sheet SITRAM H2Guard Lite — online hydrogen monitoring for liquid-filled transformers
Related products
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≤ 50 MVA · ≤ 52 kV · IEC 60076-11 dry-type Datasheet · Dimensions ↓
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50 kVA – 5 MVA · ≤ 36 kV · 50 / 60 Hz Datasheet · Dimensions ↓ GEAFOL neo