# Siemens Energy Fitformer FR3 3150 kVA 34.5/0.8 kV Natural Ester Fluid Solar Transformer

> Siemens Energy Fitformer FR3 3150 kVA ester-filled solar step-up transformer with K-class fire safety and high ambient tolerance.

> SKU: VF-SIE-FIT-FR3-3150-345 | Brand: Siemens Energy | Category: Power & Energy Equipment / Transformers / Renewable Energy Transformers (PV, Wind & BESS) / Solar PV Step-Up Transformers

**Voltformer canonical:** https://voltformer.com/product/siemens-fitformer-fr3-3150-kva-34-5-kv-solar-transformer - markdown version: https://voltformer.com/product/siemens-fitformer-fr3-3150-kva-34-5-kv-solar-transformer.md

## Overview

Siemens Energy Fitformer FR3 3150 kVA 34.5/0.8 kV Natural Ester Fluid Solar Transformer is intended for 3.15 MW Solar PV Inverter Step-Up. Configured electrical data: 3150 kVA, 34.5/0.8 kV primary/secondary voltage, 50 Hz, 3-phase, vector group Dyn11 and short-circuit impedance 6.5%. Construction: Copper (Cu-Cu); cooling: KNAN; loss class: Ecodesign Tier 2. These values support preliminary engineering selection; verify insulation levels, thermal limits, short-circuit duty, installation conditions and applicable standards against the manufacturer datasheet and the site study.

- **Application:** 3.15 MW Solar PV Inverter Step-Up
- **Target industries:** Utility Ground-Mounted Solar (PV), Floating Solar PV Plants, Rooftop Solar PV
- **Brand:** [Siemens Energy](https://voltformer.com/brand/siemens-energy.md) - The embodiment of German engineering excellence; Siemens Energy sets the industry standard with GEAFOL® cast-resin dry-type transformers, ester-oil network units and transmission-level autotransformer
- **Category:** [Power & Energy Equipment](https://voltformer.com/catalog.md) / **Transformers** / [Renewable Energy Transformers (PV, Wind & BESS)](https://voltformer.com/category/renewable-energy-transformers.md): Multi-winding, harmonic-tolerant step-up transformers for solar (PV), wind and battery storage (BESS) plants. / [Solar PV Step-Up Transformers](https://voltformer.com/category/renewable-energy-transformers/solar-pv-step-up-transformers.md)

## Technical Specifications

| Property | Value |
|---|---|
| Rated power | 3150 kVA |
| Primary / secondary voltage | 34.5 kV / 0.8 kV (±2 x 2.5%) |
| Frequency / phases | 50 Hz / 3-phase - Dyn11 |
| Short-circuit impedance (Uk) | 6.5% |
| No-load loss P0 | 2.05 kW |
| Load loss Pk | 23.5 kW |
| Calculated efficiency (power factor = 1) | 99.1954% at 100% load; 99.4993% at 50% load |
| Loss class | Ecodesign Tier 2 |
| Windings | Copper (Cu-Cu) - cooling: KNAN - insulation: Class A / high thermal endurance |
| Temperature rise | 65 K - sound pressure: 56 dB(A) |
| Mass and dimensions | 7900 kg - 2400×1620×2380 mm |
| Enclosure | IP54 / outdoor field Tipi - wheel gauge: 1070 mm |
| LI / AC withstand | 170 kV peak / 70 kV rms - partial discharge: 5 pC |
| Environment | -25°C / +40°C; altitude ≤ 1000 m |
| Core steel | CRGO Laser-Treated Grain-Oriented Silicon Steel (23ZDMH85 / Baosteel B23R085) |
| Bushings / terminals | Direct Copper Busbar Terminals (Busbar Integrated / IP00-IP31) |

## Standards

- IEC 60076-16 (Solar PV standard)
- TS EN 50708 series
- EU 548/2014 + 2019/1783 Tier 2
- IEEE C57.159

## Accessories

**Included:** Electrostatic Shield (Shielding), Buchholz Relay, Pressure Relief Device, Dual Magnetic Level Indicators
**Optional:** Envirotemp FR3 Bio-Oil Filling, Online Gas & Moisture Monitoring Sensor, MV Plug-in Terminals

## Official sources

- https://www.siemens-energy.com/global/en/home/products-services/product-offerings/transformers/power-transformers.html
- https://www.siemensenergy.com/global/en/home/products-services/product-offerings/transformers.html

- **Source scope:** manufacturer-family
- **Last reviewed:** 2026-09-13

Manufacturer family/application source. Siemens Energy Fitformer FR3 distribution transformers for solar PV parks combine high thermal endurance and bio-ester fluid for superior fire safety in hot-climate open-field utility solar farms. Exact order code, guaranteed losses, dimensions, insulation level, cooling stage, winding material and project options must be confirmed with the OEM before procurement or an SLD study.

## Pricing & Logistics

- Pricing type: RFQ (On Request) - Indicative range: $39,000 – $46,000 USD
- Delivery time: 2–8 weeks (may vary depending on technical configuration, factory capacity and destination) - Warranty: 36 months
- Compliance candidates: IEC 60076-16 (Solar PV standard), TS EN 50708 series, EU 548/2014 + 2019/1783 Tier 2, IEEE C57.159. Verify applicability and conformity against the exact offered model and project jurisdiction.

## RFQ

Request a formal factory quotation via Voltformer RFQ:

```json
POST https://voltformer.com/api/v1/rfq
{"companyName":"Example Energy","email":"procurement@example.com","items":[{"skuOrId":"VF-SIE-FIT-FR3-3150-345","quantity":1}]}
```

Full catalog JSON: https://voltformer.com/agent-catalog.json - OpenAPI: https://voltformer.com/openapi.json